CN105771884A - Molecular sieve composite material for adsorbing heavy metal in water and method for preparing molecular sieve composite material - Google Patents
Molecular sieve composite material for adsorbing heavy metal in water and method for preparing molecular sieve composite material Download PDFInfo
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- CN105771884A CN105771884A CN201610287353.3A CN201610287353A CN105771884A CN 105771884 A CN105771884 A CN 105771884A CN 201610287353 A CN201610287353 A CN 201610287353A CN 105771884 A CN105771884 A CN 105771884A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/12—Naturally occurring clays or bleaching earth
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/16—Alumino-silicates
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
Abstract
The invention relates to a molecular sieve composite material for adsorbing heavy metal in water and a method for preparing the molecular sieve composite material. The technical scheme includes that the method comprises preparing molecular sieve powder and attapulgite powder and uniformly mixing the molecular sieve powder and the attapulgite powder with each other according to a mass ratio of the molecular sieve powder to the attapulgite powder so as to obtain molecular sieve/attapulgite powder; adding distilled water or thickening agent solution into the molecular sieve/attapulgite powder and uniformly stirring the molecular sieve/attapulgite powder and the distilled water or the thickening agent solution to obtain mud-block-shaped molecular sieve mixed materials; pressing the mud-block-shaped molecular sieve mixed materials to obtain strips or columns and drying the strips or the columns under the condition of the temperature of 100-120 DEG C for 2-4 h so as to obtain dried molecular sieve mixed materials; crushing and sieving the dried molecular sieve mixed materials to obtain particles with the particle sizes of 0.45-0.9 mm, and calcining the particles in a muffle furnace under the condition of the temperature of 550-650 DEG C for 2-3 h to obtain the molecular sieve composite material for adsorbing the heavy metal in the water. The mass ratio of the molecular sieve powder to the attapulgite powder is 1-(0.4-2.0). A mass ratio of the molecular sieve/attapulgite powder to the stilled water or the thickening agent solution is 1:(0.3-0.6). The molecular sieve composite material and the method have the advantages of low production cost and simple processes. Besides, the molecular sieve composite material is high in strength and adsorption capacity and is applicable to treating heavy metal wastewater.
Description
Technical field
The invention belongs to wastewater treatment molecular sieves compound material field.It is specifically related to molecular sieves compound material of a kind of adsorbing heavy metal in water and preparation method thereof.
Background technology
In recent decades, along with human social economy and industrial the developing rapidly of modernization, heavy metal pollution is also increasingly severe, wherein serious with heavy metal pollution in wastewater.If heavy metal wastewater thereby being discharged into river and lake, can heavy damage ecological environment.Health also can be impacted by heavy metal by the mode that food chain accumulates, and human body long-term excess intake heavy metal can cause monster, mutagenesis, carcinogenic and other multiple pathological changes.Therefore, the purified treatment of heavy metal waste water has become the emphasis in current efforts at environmental protection.
At present, the processing method of domestic and international heavy metal wastewater thereby can be divided into two classes: a class is to make to be changed into insoluble heavy metal compound in the heavy metal ion of dissolved state in waste water, removes from waste water through precipitation or FLOTATION SEPARATION.Conventional method has hydroxide precipitation method, sulphide precipitation, ferrite coprecipitation, redox precipitation method, ion floatation method, electrolysis and bioanalysis etc..These methods are most commonly used that hydroxide precipitation method, sulphide precipitation, ferrite coprecipitation and redox precipitation method.Though above-mentioned most common method is respectively arranged with advantage, but there is the problem that deposit seed is tiny and need sedimentation tank；Newborn fine particle is difficult to be kept completely separate with water；Water treatment efficiency is unstable；Precipitating sludge belongs to dangerous refuse, and sludge quantity is big, and moisture content is high and Treatment of Sludge is difficult.In sulfide precipitation, precipitant is difficult to control and easily causes secondary pollution.The several method such as ion floatation method, electrolysis because processing cost is high, system complex and difficult in maintenance and be rarely employed.
Another kind of method is to carry out when not changing heavy metal ion chemical form adsorbing, concentrate and separating, and concrete grammar has hyperfiltration, electroosmose process, membrane separation process, evaporation concentration method, absorption method, ion exchange and capacity extraction method etc..Wherein the most commonly used is ion exchange, membrane separation process and absorption method.Although ion exchange environmental pollution is little, mud is few and ion interchange unit floor space is little, but its cycle is longer, one-time investment is big and organic existence also can contaminated ion exchanger resin, and the resin of ion exchange need regeneration and easily aging.Although membrane separation process effluent quality is high and stable, produce that sludge quantity is few, carry out under normal temperature condition, the good and strong adaptability without phase-state change, selectivity, but because membrane module energy consumption is high, be vulnerable to contamination and plugging and cost is of a relatively high, so the extensive use of this technology is restricted.Absorption method is to apply comparatively general method in heavy metal waste water treatment process, it it is the water treatment procedure utilizing porous solid adsorbent separation heavy metal in waste water, conventional adsorbent includes zeolite, activated carbon, bentonite and attapulgite etc., this technique has higher removal efficiency, does not cause secondary pollution and moderate cost, but activated carbon cost is of a relatively high, zeolite, bentonite and attapulgite insufficient strength, easily disperse in water.
Summary of the invention
It is contemplated that overcome prior art defect, purpose is in that to provide a kind of production cost low and the preparation method of molecular sieves compound material of the simple adsorbing heavy metal in water of technique, and the molecular sieves compound material intensity of the adsorbing heavy metal in water prepared by the method is high and adsorption capacity is big.
For achieving the above object, the technical solution used in the present invention comprises the following steps:
Step one, by molecular sieve powder: the mass ratio of attapulgite powder is 1: (0.4 ~ 2.0) dispensing, mix homogeneously, prepare molecular sieve/attapulgite powder.
Step 2, by molecular sieve/attapulgite powder: the mass ratio of distilled water or thickener soln is 1: (0.3 ~ 0.6), in molecular sieve/attapulgite powder add distilled water or add thickener soln, stir, obtain clod shape molecular sieve composite material.
The preparation method of described thickener soln is: according to distilled water: the mass ratio of thickening agent is 100: (0.3 ~ 0.9), under agitation thickening agent is homogeneously added in distilled water, the time adding thickening agent is 3 ~ 5 minutes, continue stirring 10 ~ 15 minutes after adding thickening agent, prepare thickener soln.
Step 3, clod shape molecular sieve composite material being pressed into strip or column, when 100 ~ 120 DEG C, dry 2 ~ 4h, prepares dry molecular sieves composite material.
Step 4, dry molecular sieves composite material is crushed, screening, obtain the granule that particle diameter is 0.45 ~ 0.9mm, be subsequently placed in Muffle furnace, calcine 2 ~ 3 hours under 550 ~ 650 DEG C of conditions, prepare the molecular sieves compound material of adsorbing heavy metal in water.
Described molecular sieve is the one in 3A molecular sieve, 4A molecular sieve and 13X molecular sieve.
Described thickening agent is the one in sodium carboxymethyl cellulose, sodium hydroxyethyl cellulose, methyl hydroxyethylcellulose sodium and hydroxypropyl methyl cellulose sodium.
Owing to adopting technique scheme, the present invention compared with prior art has following good effect:
(1), the molecular screen primary rich material resources and cheap that adopts of the present invention, the production cost of the molecular sieves compound material of adsorbing heavy metal in water can be significantly reduced.
(2), the preparation method of the molecular sieves compound material of the adsorbing heavy metal in water of the present invention, technique is simple and consuming time short, can be greatly improved production efficiency.
(3), the molecular sieves compound material of adsorbing heavy metal in water prepared by the present invention, using attapulgite as bonding agent, attapulgite ceramming temperature is make use of only to need the feature of 450 DEG C, when 550 ~ 650 DEG C of calcining heats, coordinate thickening agent, the intensity of material can be significantly improved.
(4), the molecular sieves compound material of adsorbing heavy metal in water prepared by the present invention is as adsorption column filler, it is applied to the enterprises such as metallurgy, plating and wiring board manufacture, owing to molecular screen primary material itself is a kind of natural clay mineral, therefore the granular materials of adsorption and enrichment high level heavy metal can be directly entered the ore-dressing technique before heavy metal is smelted, by heavy metal recovery therein after ore dressing and smelting, both avoided the secondary pollution of heavy metal, metals resources therein can be made again to be recycled.
Therefore, the present invention has that production cost is low and the simple feature of technique, and the molecular sieves compound material intensity of the adsorbing heavy metal in water of preparation is high and adsorption capacity is big, it is adaptable to the process of heavy metal wastewater thereby.
Accompanying drawing explanation
Fig. 1 is the SEM figure of the 13X molecular sieves compound material of a kind of adsorbing heavy metal in water prepared by the present invention；
Fig. 2 is the SEM figure after 13X molecular sieves compound material adsorption and enrichment Pb (II) of the adsorbing heavy metal in water shown in Fig. 1；
Fig. 3 is the SEM figure that the present invention prepares the 4A molecular sieves compound material of another kind of adsorbing heavy metal in water.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described, not the restriction to its protection domain.
Embodiment 1
A kind of 3A molecular sieves compound material of adsorbing heavy metal in water and preparation method thereof.The preparation method of the present embodiment comprises the following steps:
Step one, by molecular sieve powder: the mass ratio of attapulgite powder is 1: (0.4 ~ 0.7) dispensing, mix homogeneously, prepare molecular sieve/attapulgite powder.
Step 2, by molecular sieve/attapulgite powder: the mass ratio of distilled water is 1: (0.3 ~ 0.4), in molecular sieve/attapulgite powder add distilled water, stir, obtain clod shape molecular sieve composite material.
Step 3, clod shape molecular sieve composite material being pressed into strip, when 100 ~ 120 DEG C, dry 2 ~ 4h, prepares dry molecular sieves composite material.
Step 4, dry molecular sieves composite material is crushed, screening, obtain the granule that particle diameter is 0.45 ~ 0.9mm, be subsequently placed in Muffle furnace, calcine 2 ~ 3 hours under 550 ~ 600 DEG C of conditions, prepare the 3A molecular sieves compound material of adsorbing heavy metal in water.
Described molecular sieve is 3A molecular sieve.
With the 3A molecular sieves compound material of the adsorbing heavy metal in water prepared by the present embodiment 1 to concentration be 200mg/L carry out adsorption treatment containing Cu (II) waste water, the dosage of the 3A molecular sieves compound material of described adsorbing heavy metal in water is 2g/L, speed of agitator is 200r/min and when mixing time is 1h, and described is more than 90% containing the clearance of Cu (II) in Cu (II) waste water.
Embodiment 2
A kind of 4A molecular sieves compound material of adsorbing heavy metal in water and preparation method thereof.The preparation method of the present embodiment comprises the following steps:
Step one, by molecular sieve powder: the mass ratio of attapulgite powder is 1: (0.6 ~ 1.0) dispensing, mix homogeneously, prepare molecular sieve/attapulgite powder.
Step 2, by molecular sieve/attapulgite powder: the mass ratio of distilled water is 1: (0.3 ~ 0.4), in molecular sieve/attapulgite powder add distilled water, stir, obtain clod shape molecular sieve composite material.
Step 3, clod shape molecular sieve composite material being pressed into column, when 100 ~ 120 DEG C, dry 2 ~ 4h, prepares dry molecular sieves composite material.
Step 4, dry molecular sieves composite material is crushed, screening, obtain the granule that particle diameter is 0.45 ~ 0.9mm, be subsequently placed in Muffle furnace, calcine 2 ~ 3 hours under 550 ~ 600 DEG C of conditions, prepare the 4A molecular sieves compound material of adsorbing heavy metal in water.
Described molecular sieve is 4A molecular sieve.
With the 4A molecular sieves compound material of the adsorbing heavy metal in water prepared by the present embodiment 2 to concentration be 100mg/L carry out adsorption treatment containing Cd (II) waste water, the dosage of the 4A molecular sieves compound material of described adsorbing heavy metal in water is 1g/L, speed of agitator is 200r/min and when mixing time is 1h, and described is more than 93% containing the clearance of Cd (II) in Cd (II) waste water.
Embodiment 3
A kind of 13X molecular sieves compound material of adsorbing heavy metal in water and preparation method thereof.The preparation method of the present embodiment comprises the following steps:
Step one, by molecular sieve powder: the mass ratio of attapulgite powder is 1: (0.9 ~ 1.2) dispensing, mix homogeneously, prepare molecular sieve/attapulgite powder.
Step 2, by molecular sieve/attapulgite powder: the mass ratio of distilled water is 1: (0.4 ~ 0.5), in molecular sieve/attapulgite powder add distilled water, stir, obtain clod shape molecular sieve composite material.
Step 3, clod shape molecular sieve composite material being pressed into strip, when 100 ~ 120 DEG C, dry 2 ~ 4h, prepares dry molecular sieves composite material.
Step 4, dry molecular sieves composite material is crushed, screening, obtain the granule that particle diameter is 0.45 ~ 0.9mm, be subsequently placed in Muffle furnace, calcine 2 ~ 3 hours under 600 ~ 650 DEG C of conditions, prepare the 13X molecular sieves compound material of adsorbing heavy metal in water.
Described molecular sieve is 13X molecular sieve.
With the 13X molecular sieves compound material of the adsorbing heavy metal in water prepared by the present embodiment 3 to concentration be 100mg/L carry out adsorption treatment containing Pb (II) waste water, the dosage of the 13X molecular sieves compound material of described adsorbing heavy metal in water is 1g/L, speed of agitator is 200r/min and when mixing time is 1h, and described is more than 92% containing the clearance of Pb (II) in Pb (II) waste water.
Embodiment 4
A kind of 4A molecular sieves compound material of adsorbing heavy metal in water and preparation method thereof.The preparation method of the present embodiment comprises the following steps:
Step one, by molecular sieve powder: the mass ratio of attapulgite powder is 1: (1.2 ~ 1.5) dispensing, mix homogeneously, prepare molecular sieve/attapulgite powder.
Step 2, by molecular sieve/attapulgite powder: the mass ratio of thickener soln is 1: (0.5 ~ 0.6), in molecular sieve/attapulgite powder add thickener soln, stir, obtain clod shape molecular sieve composite material.
The preparation method of described thickener soln is: according to distilled water: the mass ratio of thickening agent is 100: (0.3 ~ 0.7), under agitation thickening agent is homogeneously added in distilled water, the time adding thickening agent is 3 ~ 5 minutes, continue stirring 10 ~ 15 minutes after adding thickening agent, prepare thickener soln.
Step 3, clod shape molecular sieve composite material being pressed into strip, when 100 ~ 120 DEG C, dry 2 ~ 4h, prepares dry molecular sieves composite material.
Step 4, dry molecular sieves composite material is crushed, screening, obtain the granule that particle diameter is 0.45 ~ 0.9mm, be subsequently placed in Muffle furnace, calcine 2 ~ 3 hours under 550 ~ 600 DEG C of conditions, prepare the 4A molecular sieves compound material of adsorbing heavy metal in water.
Described molecular sieve is 4A molecular sieve.
Described thickening agent is sodium carboxymethyl cellulose.
With the 4A molecular sieves compound material of the adsorbing heavy metal in water prepared by the present embodiment 4 to concentration be 200mg/L carry out adsorption treatment containing Cd (II) waste water, the dosage of the 4A molecular sieves compound material of described adsorbing heavy metal in water is 2g/L, speed of agitator is 200r/min and when mixing time is 1h, and described is more than 98% containing the clearance of Cd (II) in Cd (II) waste water.
Embodiment 5
A kind of 13X molecular sieves compound material of adsorbing heavy metal in water and preparation method thereof.The preparation method of the present embodiment comprises the following steps:
Step one, by molecular sieve powder: the mass ratio of attapulgite powder is 1: (1.5 ~ 2.0) dispensing, mix homogeneously, prepare molecular sieve/attapulgite powder.
Step 2, by molecular sieve/attapulgite powder: the mass ratio of thickener soln is 1: (0.5 ~ 0.6), in molecular sieve/attapulgite powder add thickener soln, stir, obtain clod shape molecular sieve composite material.
The preparation method of described thickener soln is: according to distilled water: the mass ratio of thickening agent is 100: (0.6 ~ 0.9), under agitation thickening agent is homogeneously added in distilled water, the time adding thickening agent is 3 ~ 5 minutes, continue stirring 10 ~ 15 minutes after adding thickening agent, prepare thickener soln.
Step 3, clod shape molecular sieve composite material being pressed into column, when 100 ~ 120 DEG C, dry 2 ~ 4h, prepares dry molecular sieves composite material.
Step 4, dry molecular sieves composite material is crushed, screening, obtain the granule that particle diameter is 0.45 ~ 0.9mm, be subsequently placed in Muffle furnace, calcine 2 ~ 3 hours under 600 ~ 650 DEG C of conditions, prepare the 13X molecular sieves compound material of adsorbing heavy metal in water.
Described molecular sieve is 13X molecular sieve.
Described thickening agent is the one in sodium hydroxyethyl cellulose, methyl hydroxyethylcellulose sodium and hydroxypropyl methyl cellulose sodium.
With the 13X molecular sieves compound material of the adsorbing heavy metal in water prepared by the present embodiment 5 to concentration be 200mg/L carry out adsorption treatment containing Pb (II) waste water, the dosage of the 13X molecular sieves compound material of described adsorbing heavy metal in water is 2g/L, speed of agitator is 200r/min and when mixing time is 1h, and described is more than 97% containing the clearance of Pb (II) in Pb (II) waste water.
This detailed description of the invention compared with prior art has following good effect:
The molecular screen primary rich material resources, cheap that this detailed description of the invention adopts, can significantly reduce the production cost of molecular sieves compound material；
Molecular sieves compound material prepared by this detailed description of the invention, technique is simple and consuming time short, can be greatly improved production efficiency；
Molecular sieves compound material prepared by this detailed description of the invention, using attapulgite as bonding agent, make use of attapulgite ceramming temperature only to need the feature of 450 DEG C, when 550 ~ 650 DEG C of calcining heats, coordinates thickening agent, can significantly improve the intensity of material.
Fig. 1 is the SEM figure of the 13X molecular sieves compound material of a kind of adsorbing heavy metal in water of embodiment 3 preparation, it is seen that 13X molecular sieves compound material rough surface, this is advantageously in the absorption of material heavy metal；13X molecular sieve and attapulgite link together closely, and this is to have certain cohesive force due to attapulgite, are just linked together by 13X molecular sieve while brilliant bundle bonding mutually, thus can granulating and forming, and improve granule strength；Through calcining particulate composite due to high temperature roast dehydration make 13X molecular sieve crystal and attapulgite crystal link more compact.
Fig. 2 is the SEM figure after 13X molecular sieves compound material adsorption and enrichment Pb (II) of the adsorbing heavy metal in water shown in Fig. 1, as can be seen from Figure 2, one layer of floccule it is covered with between composite crystal, this is due to the adsorption process generation neutralization precipitation effect to Pb (II) of the granule 13X molecular sieves compound material, and plane of crystal covering is Pb (OH) 2 precipitation.
Fig. 3 is the SEM figure of the 4A molecular sieves compound material of a kind of adsorbing heavy metal in water of embodiment 2 preparation, as can be seen from the figure, attapulgite is adhering closely to 4A molecular sieve surface, it is bundled together, after high-temperature roasting, attapulgite fibre bundle is reunited and is become apparent from, and duct becomes big, and recording its specific surface area is 63.8m2/g.This is owing to 4A molecular sieve occupies the passage of some attapulgites, and the attapulgite after high-temperature activation has sloughed the constitution water in part surface absorption water, zeolite water, partially crystallizable water and tetrahedron, cause intracell and duct break key so that it is the mixed and disorderly needle bar shape crystal piled up is reunited.
Molecular sieves compound material prepared by this detailed description of the invention is as adsorption column filler, it is applied to the enterprises such as metallurgy, plating, wiring board manufacture, owing to molecular screen primary material itself is a kind of natural clay mineral, therefore the granular materials of adsorption and enrichment high level heavy metal can be directly entered the ore-dressing technique before heavy metal is smelted, by heavy metal recovery therein after ore dressing and smelting, both avoided the secondary pollution of heavy metal, metals resources therein can be made again to be recycled.
Therefore, this detailed description of the invention has that production cost is low and the simple feature of technique, and the molecular sieves compound material intensity of the adsorbing heavy metal in water of preparation is high and adsorption capacity is big, it is adaptable to the process of heavy metal wastewater thereby.
Claims (4)
1. the preparation method of the molecular sieves compound material of an adsorbing heavy metal in water, it is characterised in that described preparation method comprises the following steps:
Step one, by molecular sieve powder: the mass ratio of attapulgite powder is 1: (0.4～2.0) dispensing, mix homogeneously, prepare molecular sieve/attapulgite powder；
Step 2, by molecular sieve/attapulgite powder: the mass ratio of distilled water or thickener soln is 1: (0.3～0.6), in molecular sieve/attapulgite powder, add distilled water or add thickener soln, stir, obtain clod shape molecular sieve composite material；
The preparation method of described thickener soln is: according to distilled water: the mass ratio of thickening agent is 100: (0.3～0.9), under agitation thickening agent is homogeneously added in distilled water, the time adding thickening agent is 3～5 minutes, continue stirring 10～15 minutes after adding thickening agent, prepare thickener soln；
Step 3, clod shape molecular sieve composite material being pressed into strip or column, when 100～120 DEG C, dry 2～4h, prepares dry molecular sieves composite material；
Step 4, dry molecular sieves composite material is crushed, screening, obtain the granule that particle diameter is 0.45～0.9mm, be subsequently placed in Muffle furnace, calcine 2～3 hours under 550～650 DEG C of conditions, prepare the molecular sieves compound material of adsorbing heavy metal in water.
2. the preparation method of the molecular sieves compound material of adsorbing heavy metal in water according to claim 1, it is characterised in that described molecular sieve is the one in 3A molecular sieve, 4A molecular sieve and 13X molecular sieve.
3. the preparation method of the molecular sieves compound material of adsorbing heavy metal in water according to claim 1, it is characterised in that described thickening agent is the one in sodium carboxymethyl cellulose, sodium hydroxyethyl cellulose, methyl hydroxyethylcellulose sodium and hydroxypropyl methyl cellulose sodium.
4. the molecular sieves compound material of an adsorbing heavy metal in water, it is characterised in that the molecular sieves compound material of described adsorbing heavy metal in water is the molecular sieves compound material of the adsorbing heavy metal in water prepared by the preparation method of the molecular sieves compound material of adsorbing heavy metal in water according to any one of claims 1 to 3 item.
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| CN112321104A (en) * | 2020-11-27 | 2021-02-05 | 北京嘉盛天合气体科技有限公司 | River and lake bottom mud curing repairing agent and preparation method thereof |
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| CN112321104A (en) * | 2020-11-27 | 2021-02-05 | 北京嘉盛天合气体科技有限公司 | River and lake bottom mud curing repairing agent and preparation method thereof |
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Application publication date: 20160720 |