CN109261133A - A kind of ferromagnetism composite balls and its application being easily recycled - Google Patents
A kind of ferromagnetism composite balls and its application being easily recycled Download PDFInfo
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- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
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- 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
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
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- 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
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28009—Magnetic properties
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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
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
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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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
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- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
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- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
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- B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
- B01J2220/4825—Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton
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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
- C02F2101/00—Nature of the contaminant
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- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
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Abstract
A kind of ferromagnetism composite balls and its application being easily recycled.The ferromagnetism composite balls are a kind of orbicule of the specific gravity less than 1 being prepared by charcoal, zeroth order iron powder, hollow glass microballoon, sodium alginate and calcium chloride.Preparation method is that charcoal, zeroth order iron powder and hollow glass microballoon are placed in sodium alginate soln, is instilled in calcium chloride solution after mixing with peristaltic pump, with deionized water flushing after crosslinking.It can be used for adsorbing and removing heavy metal ion trivalent chromium and the Cr VI in waste water.Adsorption equilibrium can be reached in 20h, removal rate is above 60%, and externally-applied magnetic field easy to use recycles, and greatly reduces the risk of secondary pollution.Raw material of the invention is easy to get, at low cost, and preparation process is simple, is easy to implement large-scale production, it is expected that becoming the environmentally friendly product for being widely used in removing chromium ion in water body purification.
Description
Technical field
The invention belongs to water purification technology fields, and in particular to a kind of ferromagnetism composite balls being easily recycled and its answer
With.
Background technique
China's heavy metal pollution of water body is more serious in recent years, and wherein chromium is commonplace heavy metal contaminants.Water body
Middle chromium ion mainly exists in the form of trivalent chromium and Cr VI, and trivalent chromium is essential nutrient, in sugar and fat
It plays an important role in metabolism, but trivalent chromium can excessively change permeability of cell membranes, reduce function of immune system, cause skin
Skin allergy even cancer；Cr VI is the one kind done great harm to human body in water pollutant, there is virulent property, has carcinogenic work
With, mutagenesis and cytogenetic toxicity.International cancer research institution and industrial hygiene expert association of U.S. government are all really
Determine it and is set to level-one carcinogenicity substance with carcinogenicity, and by chromium.Therefore the higher waste water of chrome content, such as electroplating wastewater, mineral products
Waste water, metallurgy and wastewater from chemical industry etc. are both needed to carry out stringent processing, can just discharge after being up to state standards.
There are many method for removing chromium ion in water removal, such as electronation, absorption, ion exchange, UF membrane, biological prosthetic and electric
Chemical remediation etc., but these existing methods, or because operating cost is higher, or be also easy to produce secondary pollution and greatly limit
Use scope.Currently, absorption method processing pollution of chromium is considered as both economical and effective method, but the adsorbent used
Type and all limited to the removal rate of pollutant, and adsorbent be finished after usually all there is a problem that recycling is difficult, because
This, often generates the desorption of pollutant and causes, it is clear that providing in a kind of pair of water body chromium ion has high removal rate, cheap and can
Facilitating the adsorption production of recycling is very important.
Summary of the invention
It is above-mentioned existing to overcome the purpose of the present invention is to provide a kind of ferromagnetism composite balls and its application being easily recycled
The problems of technology.
While it is another object of the present invention to realize efficiently removal to trivalent chromium in water body and hexavalent chromium, it is convenient for back
It receives to avoid secondary pollution.
The present invention considers that usual charcoal short texture is porous first, can provide more adsorption site, and exist again
Active hydroxyl and carboxyl has preferable trapping effect to heavy metal, but is merely able to meet to the higher removal rate of trivalent chromium,
The study found that since Cr VI is mostly with HCrO4 -And Cr2O7 2-Exist etc. negatively charged form, single charcoal is to Cr VI
Adsorbance strong reducing property that is smaller, therefore dexterously having using zeroth order iron powder, can be trivalent chromium by hexavalent chrome reduction, from
And while reducing its toxicity and increase adsorption capacity.It is mixed with charcoal with zeroth order iron powder and is realized with theoretically preliminary thus
There is the purpose of high removal rate to Cr VI and trivalent chromium.Further for making charcoal and zeroth order iron powder while playing a role,
Therefore must also have carrier that they link together, sodium alginate is a kind of natural polysaccharide, and sodium alginate soln instills chlorination
Calcium solution can generate crosslinked action and form solid gel spherical structures, and be used as nontoxic support carrier materials, for holding
Carry charcoal and zeroth order iron powder；Also, to non-modified charcoal since more there are ash content and specific surface area is smaller etc.
Problem, will lead to lower to the adsorption efficiency of pollutant, therefore consideration is modified charcoal with salt acid soak charcoal；
The ferromagnetism further being had again using the Zero-valent Iron as ferromagnetic material, therefore be not difficult quickly to be returned by externally-applied magnetic field
It receives, it is also contemplated that the ferromagnetism spherical structure cognition that charcoal and the preparation of zeroth order iron powder are only added in sodium alginate soln is sunk to
The bottom increases recovery difficult, so reloading light material again in sodium alginate soln enables the ferromagnetism composite balls of preparation
Float on after absorption in order to recycle on the water surface, and hollow glass microballoon be a kind of sphere that Novel hollow is closed,
Pulverulent Ultralight packing material, ingredient are soda lime borosilicate glass, and chemical property is stablized, and have and mitigate weight
Effect, thus present invention uses hollow glass microballoon come reduce the density of ferromagnetism composite balls to bubble through the water column on.
The ferromagnetism composite balls being easily recycled of the invention are one kind by charcoal, zeroth order iron powder, hollow glass microballoon, sea
Orbicule of the specific gravity that mosanom and calcium chloride solution are prepared into less than 1.
The preparation method of above-mentioned ferromagnetism composite balls includes the following steps:
(1) for 24 hours with the salt acid soak charcoal of 3mol/L, after filtering with deionized water or distilled water clean to pH be 7 ±
0.2, dry 8~12h, sieves with 100 mesh sieve, obtains modification biological charcoal in 60~80 DEG C of thermostatic drying chamber；
(2) sodium alginate is placed in deionized water or distilled water, heats and stir in 40~50 DEG C of thermostat water bath
It mixes to sodium alginate and is completely dissolved, preparation mass concentration is 1.5%~3% sodium alginate soln；
(3) above-mentioned modification biological charcoal, zeroth order iron powder are mixed into sodium alginate soln with mass ratio for the ratio of 1:3~3:1,
The ratio of sodium alginate soln volume and addition modification biological charcoal and iron powder gross mass is 20 (mL): 1 (g), and hollow glass is added
Glass microballoon obtains fluid-mixing；
(4) by above-mentioned fluid-mixing, with flow, to be 2.5~5mL/min instill mass fraction by peristaltic pump is 2%~4%
Calcium chloride solution in, after full cross-linked 8~12h with deionized water rinse several times to remove extra calcium ion, obtain ferromagnetic
Property composite balls.
Preferably, charcoal is the Enteromorpha charcoal prepared by raw material of Enteromorpha.
The volume ratio of the hydrochloric acid of the quality and 3mol/L of charcoal is 1 (g): 10 (mL) in above-mentioned steps (1).
The quality of hollow glass microballoon is the 3/4 of modification biological charcoal and iron powder gross mass in above-mentioned steps (3).
The ferromagnetism composite balls that one kind made of the above method easily recycles can be used for adsorbing or removing the heavy metal in waste water
Ion trivalent chromium and Cr VI.
The present invention provides a kind of novel adsorption productions, and hollow glass is added using charcoal, zeroth order iron powder as raw material
Microballoon is prepared for a kind of ferromagnetism composite balls being easily recycled.It is efficiently inhaled in combination with physisorphtion and chemical reduction method
The chromium ion in removal waste water is echoed, zeroth order iron powder ferromagnetism feature is also used and makes under externally-applied magnetic field, is enabled fast
The recycling of speed is to block secondary pollution.
Compared with the prior art, raw material sources of the invention are easy to get, and preparation cost is lower, manufactured ferromagnetism composite balls energy
The efficiently chromium ion in removal water body, is above 60% to the removal rate of trivalent chromium and Cr VI, and be easily recycled, substantially reduces
The risk of secondary pollution.Preparation process is simple, is easy to implement large-scale production, is widely used in water body purification it is expected that becoming
Remove the environmentally friendly product of chromium ion.
Detailed description of the invention
Fig. 1 is the magnetic hysteresis tropic schematic diagram of composite balls prepared by the present invention.
Fig. 2 is the FTIR spectrum figure of composite balls prepared by the present invention.
Fig. 3 is for composite balls prepared by the present invention in different time to the removal rate schematic diagram of trivalent chromium in water.
Fig. 4 is for composite balls prepared by the present invention in different time to the removal rate schematic diagram of Cr VI in water.
Specific embodiment
The present invention for 24 hours, is cleaned to pH with deionized water or distilled water after filtering with the salt acid soak charcoal of 3mol/L and is
Neutrality, dry 12h, sieves with 100 mesh sieve, obtains modification biological charcoal in 60 DEG C of thermostatic drying chamber；By sodium alginate be placed in from
It in sub- water, heats and is stirred to sodium alginate in 40 DEG C of thermostat water bath and be completely dissolved, preparation mass concentration is 2.5% sea
Solution of sodium alginate；Above-mentioned modification biological charcoal, ratio of the zeroth order iron powder with mass ratio for 2:1 are mixed into sodium alginate soln, seaweed
The ratio of acid sodium solution volume and addition modification biological charcoal and iron powder gross mass is 20 (mL): 1 (g), and it is micro- that hollow glass is added
Ball (U.S., 3M, S38HS/VS5500, density: 0.30g/CC, partial size: 40~200 μm) obtains fluid-mixing, and hollow glass is micro-
The quality of ball is the 3/4 of modification biological charcoal and iron powder gross mass；Above-mentioned fluid-mixing is passed through into peristaltic pump with flow for 4mL/min
It instills in the calcium chloride solution that mass fraction is 3%, is rinsed with deionized water several times to remove extra calcium after full cross-linked 10h
Ion to get arrive ferromagnetism composite balls.It is illustrated combined with specific embodiments below.
Embodiment 1
The hydrochloric acid 100mL of 3mol/L is added to the 10g Enteromorpha charcoal baked, immersion is filtered afterwards for 24 hours, uses deionized water
Rinsing to pH is neutrality, and dry 12h, sieves with 100 mesh sieve in 60 DEG C of thermostatic drying chamber, obtains modified Enteromorpha charcoal；
2.5g sodium alginate is placed in 100mL deionized water, heated in 40 DEG C of thermostat water bath and is stirred to sea
Mosanom is completely dissolved, and prepares the sodium alginate soln that mass fraction is 2.5%；
It is molten to weigh the 20mL sodium alginate that modified Enteromorpha charcoal 0.33g and zeroth order iron powder 0.67g is mixed into above-mentioned preparation
Simultaneously 0.75g hollow glass microballoon is added in liquid thereto, obtains fluid-mixing；
Above-mentioned fluid-mixing is instilled into the calcium chloride solution that mass fraction is 3% by peristaltic pump with the flow velocity of 3mL/min
In, it is crosslinked after 10h and rinses the ferromagnetism composite balls being easily recycled several times to remove extra calcium ion with deionized water.
The magnetic hysteresis of ferromagnetism composite balls returns line chart as shown in Figure 1, it can be seen that the saturation magnetic intensity of the ferromagnetism composite balls is
39.29emu/g, can in the presence of externally-applied magnetic field rapid aggregation, facilitate recycling.Fourier's infrared light of ferromagnetism composite balls
Spectrogram is as shown in Figure 2, it can be seen that and the composite balls active strong hydroxyl and carboxyl can ionize out negative electrical charge in water,
There is preferable adsorption effect to the trivalent chromium with positive charge.
Here is the application of above-mentioned manufactured ferromagnetism composite balls trivalent chromium in removal waste water.
Using chromic nitrate as chromium source, 10mg/L standard solution 200mL is prepared；10g ferromagnetism composite balls are taken to be added above-mentioned each
It in solution, is placed in constant temperature oscillator, vibrates in the case where temperature is 30 DEG C, revolving speed is 120rpm, sample at regular intervals, inhale
After attached removal process, with potassium permanganate oxidation, then dyed with 1,5- diphenylcarbazide solution, in uv-spectrophotometric
It counts and measures absorbance at 540nm.As a result as shown in figure 3, being 10mg/L in trivalent chromium concentration, ferromagnetism composite balls dosage is
When 50g/L, balance, removal rate 94.3% can be reached in 10h or so.
And with the increase of trivalent chromium concentration, ferromagnetism composite balls also increase the adsorbance of trivalent chromium, in 303K (30
DEG C) under the conditions of, the fitting by adsorpting data to Langmuir adsorption isotherm finds data fit Langmuir absorption etc.
Warm line, the formula of Langmuir adsorption isotherm are as follows:
Wherein qeAnd ceThe respectively equilibrium concentration of equilibrium adsorption capacity and solution, qmFor maximal absorptive capacity, b Langmuir
Adsorption isotherm constant, by the slope of straight line after digital simulation, obtaining maximal absorptive capacity is 62.11mg/g.
Embodiment 2
The hydrochloric acid 50mL of 3mol/L is added to the 5g Enteromorpha charcoal baked, immersion is filtered afterwards for 24 hours, rushed with deionized water
PH is washed till as neutrality, dry 10h, sieves with 100 mesh sieve in 80 DEG C of thermostatic drying chamber, obtains modified Enteromorpha charcoal；
0.6g sodium alginate is placed in 20mL deionized water, heated in 50 DEG C of thermostat water bath and is stirred to seaweed
Sour sodium is completely dissolved, and prepares the sodium alginate soln that mass fraction is 3%；
It weighs the modified Enteromorpha charcoal of 0.25g and 0.75g zeroth order iron powder is mixed into 20mL sodium alginate soln and adds thereto
Enter 0.75g hollow glass microballoon, obtains fluid-mixing；
Above-mentioned fluid-mixing is instilled into the calcium chloride solution that mass fraction is 4% by peristaltic pump with the flow velocity of 4mL/min
In, it is crosslinked after 8h and rinses the ferromagnetism composite balls being easily recycled several times to remove extra calcium ion with deionized water.
Here is the application of above-mentioned manufactured ferromagnetism composite balls Cr VI in removal waste water.
Using potassium bichromate as chromium source, 10mg/L standard solution 200mL is prepared；10g ferromagnetism composite balls are taken to be added above-mentioned
It in each solution, is placed in constant temperature oscillator, vibrates in the case where temperature is 30 DEG C, revolving speed is 120rpm, sample at regular intervals,
It after Adsorption process, is dyed with 1,5- diphenylcarbazide solution, extinction is measured at ultraviolet specrophotometer 540nm
Degree.As a result as shown in figure 4, hexavalent chromium concentration is 10mg/L, when ferromagnetism composite balls dosage is 50g/L, in 20h or so energy
Reach balance, equilibrium adsorption capacity 60.09%.
With the increase of hexavalent chromium concentration, ferromagnetism composite balls also increase the adsorbance of Cr VI, at 303K (30 DEG C)
Under the conditions of, the fitting by adsorpting data to Langmuir adsorption isotherm, obtaining maximal absorptive capacity is 38.02mg/g.
Obviously, the ferromagnetism composite balls being easily recycled of the invention are to trivalent chromium and Cr VI removal rate with higher,
It is a kind of effective purification of water quality product.
Claims (8)
1. a kind of ferromagnetism composite balls being easily recycled, it is characterized in that by charcoal, zeroth order iron powder, hollow glass microballoon, seaweed
Orbicule of the specific gravity that sour sodium and calcium chloride solution are prepared into less than 1.
2. a kind of preparation method for the ferromagnetism composite balls being easily recycled, which comprises the steps of:
(1) for 24 hours with the salt acid soak charcoal of 3mol/L, being cleaned with deionized water or distilled water to pH after filtering is 7 ± 0.2,
Dry 8 ~ 12h, sieves with 100 mesh sieve, obtains modification biological charcoal in 60 ~ 80 DEG C of thermostatic drying chamber；
(2) sodium alginate is dissolved in deionized water or distilled water, heated in 40 ~ 50 DEG C of thermostat water bath and stirred to sea
Mosanom is completely dissolved, and preparation mass concentration is 1.5% ~ 3% sodium alginate soln；
(3) above-mentioned modification biological charcoal, ratio of the zeroth order iron powder with mass ratio for 1:3 ~ 3:1 are mixed into sodium alginate soln, seaweed
The ratio of acid sodium solution volume and addition modification biological charcoal and iron powder gross mass is 20(mL): 1(g), and it is micro- that hollow glass is added
Ball obtains fluid-mixing；
It (4) is that 2.5 ~ 5mL/min instills the calcium chloride that mass fraction is 2% ~ 4% by peristaltic pump with flow by above-mentioned fluid-mixing
In solution, rinsed with deionized water several times to remove extra calcium ion after full cross-linked 8 ~ 12h, what is be easily recycled is ferromagnetic
Property composite balls.
3. the preparation method of ferromagnetism composite balls according to claim 2, which is characterized in that charcoal is in step (1)
The Enteromorpha charcoal prepared using Enteromorpha as raw material.
4. the preparation method of ferromagnetism composite balls according to claim 2, which is characterized in that charcoal in step (1)
The volume ratio of the hydrochloric acid of quality and 3mol/L is 1(g): 10(mL).
5. the preparation method of ferromagnetism composite balls according to claim 2, which is characterized in that hollow glass in step (3)
The quality of microballoon is the 3/4 of modification biological charcoal and iron powder gross mass.
6. the ferromagnetism composite balls of claim 1 being easily recycled are applied to adsorb and remove the heavy metal ion trivalent in waste water
Chromium and Cr VI.
7. the ferromagnetism composite balls according to claim 6 being easily recycled, characterized in that the side applied to removal trivalent chromium
The removal step of method are as follows: ferromagnetism composite balls are invested in water body with the concentration of 50g/L, are in trivalent chromium initial concentration
When 10mg/L, after adsorbing 10h, by externally-applied magnetic field, the ferromagnetism composite balls rapid aggregation of adsorption saturation is recycled.
8. the ferromagnetism composite balls according to claim 6 being easily recycled, characterized in that the side applied to removal Cr VI
The removal step of method are as follows: ferromagnetism composite balls are invested in water body with the concentration of 50g/L, are in Cr VI initial concentration
When 10mg/L, after adsorbing 20h, by externally-applied magnetic field, the ferromagnetism composite balls rapid aggregation of adsorption saturation is recycled.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110330082A (en) * | 2019-07-12 | 2019-10-15 | 北京师范大学 | A kind of room temperature preparation method and applications of iron carbon particle |
| CN111729644A (en) * | 2020-07-31 | 2020-10-02 | 河海大学 | Biochar-bentonite porous composite ball and preparation method thereof |
| CN111774092A (en) * | 2020-06-23 | 2020-10-16 | 湖南海利化工股份有限公司 | Catalyst for alkaline hydrolysis of pyraclostrobin production wastewater, preparation method of catalyst and pretreatment method of pyraclostrobin production wastewater |
| CN112551631A (en) * | 2020-12-01 | 2021-03-26 | 长春工业大学 | Method for rapidly reducing concentration of heavy metal chromium ions in water |
| CN113416552A (en) * | 2021-06-18 | 2021-09-21 | 煜环环境科技有限公司 | Soil remediation agent and preparation method and application thereof |
| CN113462074A (en) * | 2021-05-31 | 2021-10-01 | 北京航天凯恩化工科技有限公司 | Low-density low-emission low-odor filling functional material and preparation thereof |
| CN113666460A (en) * | 2021-05-10 | 2021-11-19 | 中国海洋大学 | Zero-valent metal loaded alginate-based carbon spheres and preparation method and application thereof |
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| CN110330082A (en) * | 2019-07-12 | 2019-10-15 | 北京师范大学 | A kind of room temperature preparation method and applications of iron carbon particle |
| CN111774092A (en) * | 2020-06-23 | 2020-10-16 | 湖南海利化工股份有限公司 | Catalyst for alkaline hydrolysis of pyraclostrobin production wastewater, preparation method of catalyst and pretreatment method of pyraclostrobin production wastewater |
| CN111774092B (en) * | 2020-06-23 | 2022-11-25 | 湖南海利化工股份有限公司 | Catalyst for alkaline hydrolysis of pyraclostrobin production wastewater, preparation method thereof and pretreatment method of pyraclostrobin production wastewater |
| CN111729644A (en) * | 2020-07-31 | 2020-10-02 | 河海大学 | Biochar-bentonite porous composite ball and preparation method thereof |
| CN112551631A (en) * | 2020-12-01 | 2021-03-26 | 长春工业大学 | Method for rapidly reducing concentration of heavy metal chromium ions in water |
| CN113666460A (en) * | 2021-05-10 | 2021-11-19 | 中国海洋大学 | Zero-valent metal loaded alginate-based carbon spheres and preparation method and application thereof |
| CN113462074A (en) * | 2021-05-31 | 2021-10-01 | 北京航天凯恩化工科技有限公司 | Low-density low-emission low-odor filling functional material and preparation thereof |
| CN113462074B (en) * | 2021-05-31 | 2022-04-01 | 北京航天凯恩化工科技有限公司 | Low-density low-emission low-odor filling functional material and preparation thereof |
| CN113416552A (en) * | 2021-06-18 | 2021-09-21 | 煜环环境科技有限公司 | Soil remediation agent and preparation method and application thereof |
| CN113416552B (en) * | 2021-06-18 | 2022-06-28 | 煜环环境科技有限公司 | Soil remediation agent and preparation method and application thereof |
| CN115990481A (en) * | 2022-12-05 | 2023-04-21 | 自然资源部天津海水淡化与综合利用研究所 | Magnetic suspension heterogeneous catalyst and preparation method and application thereof |
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