CN106622163B - Responsive to temperature type Lauxite and its preparation method and application - Google Patents

Responsive to temperature type Lauxite and its preparation method and application Download PDF

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CN106622163B
CN106622163B CN201510733170.5A CN201510733170A CN106622163B CN 106622163 B CN106622163 B CN 106622163B CN 201510733170 A CN201510733170 A CN 201510733170A CN 106622163 B CN106622163 B CN 106622163B
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responsive
temperature
heavy metal
lauxite
metal ion
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CN106622163A (en
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唐双凌
刘琎松
魏倩
陈斌
赵祎舒
谢剑南
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Nanjing University of Science and Technology
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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
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/26—Synthetic macromolecular compounds
    • B01J20/262—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon to carbon unsaturated bonds, e.g. obtained by polycondensation
    • 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
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/26—Synthetic macromolecular compounds
    • B01J20/264—Synthetic macromolecular compounds derived from different types of monomers, e.g. linear or branched copolymers, block copolymers, graft copolymers
    • 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
    • C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
    • 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
    • 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
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds

Abstract

The invention discloses a kind of responsive to temperature type Lauxites, are prepared using alkali-acid two-step method, and the Lauxite has temperature sensitive properties, can be realized reversible dissolution-precipitating under the conditions of heating-cooling.Responsive to temperature type Lauxite of the invention can be used as adsorbent, adsorb the heavy metal ion in waste water, after adsorption saturation, temperature is risen into lowest critical solution temperature or more, obtain resin and heavy metal ion coexists aqueous solution, it adds extractant and carries out liquid-liquid extraction, obtain resin aqueous solution through extraction and separation, the resin that can be recycled after being cooled to room temperature.It is at low cost as the heavy metal ion in adsorbent removal water body using responsive to temperature type Lauxite, removal efficiency is high, it is easy to operate, and the resin after extraction and separation easily regenerates, cyclic utilization rate is high, secondary pollution is avoided, while being beneficial to the recycling in subsequent back extraction treatment process to heavy metal ion, there is good economy and environmental benefit.

Description

Responsive to temperature type Lauxite and its preparation method and application
Technical field
The present invention relates to a kind of macromolecule chelating resins of environment protection field, and in particular to a kind of to utilize alkali-acid two-step process Application of the responsive to temperature type Lauxite as well as adsorbent material of synthesis in heavy metal in water ion processing.
Background technique
With mining, exhaust gas discharge, sewage irrigation and using the artificial movable aggravation such as heavy metals exceeding standard product, in environment Content of beary metal increase year by year, directly jeopardize human health, and result in environmental quality deterioration.Simultaneously as heavy metal Have the characteristics that be not easy to be metabolized, bioconcentration and highly toxic, pollution problem more and more attention has been paid to.How efficiently, letter Just the heavy metal removed in environment has become urgent problem to be solved.
Currently, the method for heavy-metal ion removal mainly includes liquid-liquid extraction method, emulsion liquid membrane extraction, ion friendship from water body Change method and absorption method etc..Absorption method mainly passes through the mechanism such as physical absorption or chemisorption and is fixed on the heavy metal ion in water On the surface of adsorbent, achieve the purpose that heavy-metal ion removal, this method treatment effeciency is high, operating method is simple, by wide General concern.
In recent years, the research using heavy metal ion in macromolecule chelating resin adsorbed water body has been carried out both at home and abroad.Tao Xue Text et al. selects nitrogen-type chelating resin IRC747, a kind of using amido N atom as the resin of donor residues, as high-selectivity adsorption Agent has a good adsorption effect to copper ion and nickel ion, highest adsorption capacity respectively up to 0.982mmol/g and 0.974mmol/g, but the resin higher cost, synthesis technology is complicated, and the regeneration period is longer, has limitation in technique popularization Property (research of the typical nitrogen-type chelating resin to cupro-nickel ionic adsorption stalling characteristic, ion exchange and absorption, 2015).
To reduce the cost of adsorbent material and synthesis difficulty in absorption method, foreign countries, which have, makees Lauxite cheap and easy to get Heavy Metals in Waters ionic adsorption and isolated report are applied to for adsorbent material.Elif Ertan et al. using Lauxite from Heavy metal ion gold ion is separated and recovered in waste water, the Lauxite for being 1.0 by synthesis molar ratio, using batch method and Column facture has done a series of absorption research, and resin is 0.088meq/g to the adsorption capacity of gold ion, however the resin It can not regenerate and be recycled, the secondary pollution of solid waste can be brought to environment, is restricted in application aspect (Separation of gold(Ⅲ)ions from copper(Ⅱ)and zinc(Ⅱ)ions using thiourea- Formaldehyde or urea-formaldehyde chelating resins, Journal of Applied Polymer Science, 2009).
Summary of the invention
For the problem low as adsorbent recovery utilization rate of Lauxite in the prior art, the present invention provides a kind of temperature Spend responsive type ureaformaldehyde (UF) resin.
The responsive to temperature type Lauxite is synthesized by urea and formaldehyde using alkali-acid two-step process, and temperature is sensitive Property mechanism be temperature rise when molecular resin form change, from reticular structure to linear structure transition, and temperature changes Become the formation and destruction, the formation of hydrophobic grouping and disintegration for leading to Lauxite polar groups and water hydrogen bond, so that ureaformaldehyde tree Rouge has water-soluble and water dispersible reversible change property.
The present invention also provides the preparation methods of above-mentioned responsive to temperature type Lauxite, the specific steps are as follows: first by portion Urea is divided to be added into formalin, adjusting pH value is 7.5~8.0,90~95 DEG C is warming up to after being uniformly mixed, reaction 40 ~60min, adjusting pH after reaction is 4.0~4.5, the reaction was continued 40~60min, is cooled to 80~85 DEG C later, is added Remaining urea, and pH to 6.0~6.5 is adjusted, 3~8min is reacted, cooling obtains responsive to temperature type ureaformaldehyde after reaction Resin.
Further, the molar ratio of the formaldehyde and urea is 0.8~1.2.
Further, the mass concentration of the formalin is 37%.
In preparation method of the invention, the first stage is addition reaction, i.e., the formaldehyde in alkalescent (pH value 7~8) medium Hydroxymethylation is carried out with urea, in this stage, due to the difference of formaldehyde and urea mol ratio, a hydroxyl theoretically can be generated Methylurea, dimethylol urea, trimethylol urea, tatramethylol urea；Second stage is polycondensation reaction, i.e., in acid (pH value 4~6) In medium, condensation reaction occurs for a variety of methylolureas and urea, obtains the polymer with linear structure, exposed terminated groups are with hydroxyl Based on methyl, the Lauxite on strand with certain proportion hydrophilic radical and hydrophobic grouping finally can be obtained.Due to temperature Change will cause the formation and destruction, the formation of hydrophobic grouping and disintegration between polar group with water hydrogen bond, so be prepared Resin has good temperature sensitivity, lowest critical solution temperature (lower critical solution Temperature, LCST) it is 40~80 DEG C, when temperature is lower than lowest critical solution temperature, resin is the form of water dispersion, White lotion, and when temperature is higher than lowest critical solution temperature, resin is water-soluble form, is in clear transparent solutions.
The present invention also provides application of the above-mentioned responsive to temperature type Lauxite in heavy metal ion adsorbed processing.
Further, application of the responsive to temperature type Lauxite in heavy metal ion adsorbed processing, specific side Method are as follows: using above-mentioned responsive to temperature type Lauxite as adsorbent, adsorb the heavy metal ion in heavy metal-containing waste water, adsorption saturation Afterwards, temperature is risen to lowest critical solution temperature or more by heating, and obtain resin and heavy metal ion coexists aqueous solution, is added Extractant carries out liquid-liquid extraction, obtains resin aqueous solution through extraction and separation, the resin recycled after being cooled to room temperature.
Preferably, the concentration of the extractant is 1~4mol/L, and the pH for adsorbing environment is 1.0~6.0, adsorption time No less than 0.5h, adsorption temp are 10 DEG C~40 DEG C.
Further, the extractant is selected from the organic of organic mixed phase of tributyl phosphate and benzene, sulfoxide and benzene Organic mixed phase of mixed phase or N- n-octyl caprolactam and benzene, preferably tributyl phosphate and the organic mixed phase of benzene.
It in one particular embodiment of the present invention, is adsorbent using above-mentioned responsive to temperature type Lauxite, using perseverance Heavy metal ion in the method absorption heavy metal-containing waste water of temperature oscillation absorption.
Contain N and O atom in Lauxite molecular structure, there is orphan to center, can be made with heavy metal ion by coordination With formation chelate.Meanwhile it being capable of invertibity dissolution-precipitating under the conditions of heating-cooling using responsive to temperature type Lauxite Characteristic, by liquid-liquid extraction realize resin and heavy metal ion separation, achieve the purpose that resin recycles.
When waste water of the adsorption treatment containing heavy metal ion, the dosage of adsorbent can select as the case may be.Temperature is sensitive Type Lauxite under mildly acidic conditions can heavy metal ion in efficient absorption water body.Adsorption time and temperature are to adsorption effect It has a certain impact, can be appropriately adjusted according to actual conditions.
Compared with prior art, the invention has the benefit that Lauxite prepared by the present invention has good temperature Sensibility can reversibly be dissolved-be precipitated under conditions of heating-cooling.Preparation process is simple and convenient to operate.Utilize temperature It is at low cost as the heavy metal ion in adsorbent removal water body to spend responsive type Lauxite, removal efficiency is high, and it is easy to operate, and Resin after extraction and separation easily regenerates, and cyclic utilization rate is high, avoids resin as solid waste and generates secondary pollution to environment, together When be beneficial to recycling to heavy metal ion in subsequent back extraction treatment process, strong applicability can bring significant economy Benefit.
Detailed description of the invention
Fig. 1 is the curve graph that the light transmittance for the responsive to temperature type urea-formaldehyde resin aqueous solution that embodiment 1 synthesizes varies with temperature.
Fig. 2 is the grain size distribution for the responsive to temperature type Lauxite that embodiment 1 synthesizes.
Fig. 3 is the scanning electron microscope (SEM) photograph for the responsive to temperature type Lauxite that embodiment 1 synthesizes.
Fig. 4 is the Fourier's infrared spectrum for the responsive to temperature type Lauxite that embodiment 1 synthesizes.
Fig. 5 is final adsorption effect pair of the 6 responsive to temperature type Lauxite of embodiment under different thorium ion initial concentrations Than figure.
Fig. 6 is final adsorption effect comparison diagram of the responsive to temperature type Lauxite under different adsorption times in embodiment 7.
Fig. 7 is final adsorption effect comparison diagram of the responsive to temperature type Lauxite at different pH in embodiment 8.
Fig. 8 is final adsorption effect comparison diagram of the responsive to temperature type Lauxite under different adsorption temps in embodiment 9.
Fig. 9 is the reperformance test result figure of 15 responsive to temperature type Lauxite of embodiment.
Specific embodiment
Below with reference to embodiment and attached drawing, the invention will be further described.
Embodiment 1
Whole formaldehyde 64.86g is poured into a kettle, first urea 21.82g is added, and adjusting pH value is 7.5, mixing Stirring after being warming up to 95 DEG C, reacts 1h；Adjusting pH value is 4.0, the reaction was continued 1h；85 DEG C are cooled to, second batch urea is added 38.18g, adjusting pH is 6.0, reaction 3min or so；40 DEG C are cooled to, responsive to temperature type ureaformaldehyde (UF) resin can be obtained in discharging.
In the case where wavelength is 550nm, influence of the different temperatures to the Lauxite light transmittance being prepared is observed, as a result as schemed Shown in 1.As shown in Figure 1, when temperature is increased to 50~60 DEG C, light transmittance increases suddenly, shows apparent temperature sensitivity, I.e. lowest critical solution temperature (LCST) is 50~60 DEG C.
Temperature sensitive type ureaformaldehyde (UF) resin carries out micron granularity test (wet process), as a result sees Fig. 2.It can be seen by Fig. 2 Out, the average grain diameter of responsive to temperature type ureaformaldehyde (UF) resin is 1.81 μm, illustrates that the resin has lesser partial size, has larger Specific surface area, be conducive to the subsequent absorption to heavy metal ion.
The observation that configuration of surface is carried out using temperature sensitive type ureaformaldehyde (UF) resin of scanning electron microscope, is as a result shown in figure 3.From the figure 3, it may be seen that resin shows grain structure, average grain diameter is 1.5~2.5 μm, and even particulate dispersion, the group of being not susceptible to It is poly-.
Using Fourier infrared spectrograph temperature sensitive type ureaformaldehyde (UF) resin surface, functional group is analyzed, and is as a result seen Fig. 4.As seen from Figure 4, in 3327cm-1There is wide and strong absorption peak at place, corresponds to-OH and-NH2Stretching vibration absorb Peak illustrates that the resin of preparation has the-OH and-NH that coordination can largely occur with heavy metal ion2Isoreactivity adsorption potential Point.
Embodiment 2
Whole formaldehyde 64.86g is poured into a kettle, first urea 21.82g is added, and adjusting pH value is 8.0, mixing Stirring after being warming up to 90 DEG C, reacts 40min；Adjusting pH value is 4.5, the reaction was continued 40min；80 DEG C are cooled to, second batch urine is added Plain 38.18g, adjusting pH is 6.5, reacts 8min；40 DEG C are cooled to, responsive to temperature type ureaformaldehyde (UF) resin can be obtained in discharging.This Resin has good temperature sensitivity, and lowest critical solution temperature (LCST) is 40~60 DEG C, but stability is poor.
Embodiment 3
Whole formaldehyde 97.30g is poured into a kettle, first urea 21.82g is added, and adjusting pH value is 7.5, mixing Stirring after being warming up to 95 DEG C, reacts 1h；Adjusting pH value is 4.0, the reaction was continued 1h；85 DEG C are cooled to, second batch urea is added 38.18g, adjusting pH is 6.0, reacts 3min；40 DEG C are cooled to, responsive to temperature type ureaformaldehyde (UF) resin can be obtained in discharging.This tree Rouge has poor temperature sensitivity, and lowest critical solution temperature (LCST) is 70~80 DEG C.
Embodiment 4
Responsive to temperature type ureaformaldehyde (UF) resin being prepared using embodiment 1 is a huge sum of money typical in adsorbent adsorbed water body Belong to ion silver ion.It is adsorbed on constant-temperature table and carries out.The initial concentration of silver ion is 100mg/L, and the pH value of solution is 4.0, Adsorption temp is 25 DEG C, and after adsorbing 1h, resin is 91.21% to the eliminating rate of absorption of silver ion, and adsorption capacity can reach 14.62mg/g。
Embodiment 5
Responsive to temperature type ureaformaldehyde (UF) resin being prepared using embodiment 1 is a huge sum of money typical in adsorbent adsorbed water body Belong to ion thorium ion.It is adsorbed on constant-temperature table and carries out.The initial concentration of thorium ion is 100mg/L, and the pH value of solution is 4.5, Adsorption temp is 25 DEG C, and after adsorbing 6h, resin is 96.47% to the eliminating rate of absorption of thorium ion, and adsorption capacity can reach 17.83mg/g。
Embodiment 6
Responsive to temperature type ureaformaldehyde (UF) resin being prepared using embodiment 1 is a huge sum of money typical in adsorbent adsorbed water body Belong to ion thorium ion.The initial concentration that thorium ion is arranged is 40~140mg/L, and other conditions are same as Example 9, and detection is different Influence of the initial concentration to final adsorption effect, is as a result shown in Fig. 5.
As seen from Figure 5: the adsorbance of responsive to temperature type ureaformaldehyde (UF) resin with the rising of thorium ion initial concentration and It is continuously increased, until reaching adsorption capacity.And measure thorium ion initial concentration be 40mg/L when, removal rate of the resin to thorium ion It is 79.18%, adsorption capacity 14.61mg/g；When initial concentration is 140mg/L, resin is to the removal rate of thorium ion 32.24%, adsorption capacity 20.89mg/g.
Embodiment 7
Responsive to temperature type ureaformaldehyde (UF) resin being prepared using embodiment 1 is a huge sum of money typical in adsorbent adsorbed water body Belong to ion thorium ion.Setting adsorption time is 0.5h~8h, and other conditions are same as Example 9, detect different adsorption times pair The influence of final adsorption effect, is as a result shown in Fig. 6.
Fig. 6 show responsive to temperature type ureaformaldehyde (UF) resin to the absorption of thorium ion through 6h substantially up to adsorption equilibrium, balance When eliminating rate of absorption be 96.2%, adsorption capacity 17.83mg/g.
Embodiment 8
Responsive to temperature type ureaformaldehyde (UF) resin being prepared using embodiment 1 is a huge sum of money typical in adsorbent adsorbed water body Belong to ion thorium ion.The pH value that thorium ion solution is arranged is 1.0~6.0, and other conditions are same as Example 9, detect different pH Influence to final adsorption effect, is as a result shown in Fig. 7.
Learnt by Fig. 7: responsive to temperature type ureaformaldehyde (UF) resin is to the removal effect of thorium ion with after the becoming larger and first rise of pH Decline, and reach best when pH is 4.5 or so, responsive to temperature type ureaformaldehyde (UF) resin is to the removal rate of thorium ion at this time 97.20%, adsorption capacity 17.96mg/g.
Embodiment 9
Responsive to temperature type ureaformaldehyde (UF) resin being prepared using embodiment 1 is a huge sum of money typical in adsorbent adsorbed water body Belong to ion thorium ion.Wherein adsorption temp is 10 DEG C, 25 DEG C, 40 DEG C, and other conditions are same as Example 9, detect different absorption Influence of the temperature to final adsorption effect, is as a result shown in Fig. 8.
Fig. 8 shows to increase the adsorption capacity of thorium ion with the resin that increases of temperature, and temperature rises to 40 DEG C from 10 DEG C When, the adsorption capacity of resin increases to 22.84mg/g by 20.74mg/g.
Embodiment 10
In embodiment 9, other conditions are constant, after responsive to temperature type ureaformaldehyde (UF) resin adsorption saturation, after heating Aqueous solution coexists to resin and thorium, recycles corresponding extractant to carry out liquid-liquid extraction, obtains resin aqueous solution through extraction and separation, The removal of thorium ion in water body is back to after being cooled to room temperature.Extractant chooses the tributyl phosphate (TBP)-that concentration is 2mol/L Benzene mixes organic phase, and water phase and organic phase are comparably 1:2, ionic strength 0.1mol/L, and repeated reproducibility efficiency is 95.13%.
Embodiment 11
Tricresyl phosphate fourth in tributyl phosphate (TBP) unlike the present embodiment is unique from embodiment 10-benzene mixing organic phase The concentration of ester is 1mol/L, and repeated reproducibility efficiency is 61.42%.
Embodiment 12
Tricresyl phosphate fourth in tributyl phosphate (TBP) unlike the present embodiment is unique from embodiment 10-benzene mixing organic phase The concentration of ester is 4mol/L, and repeated reproducibility efficiency is 84.86%.
Embodiment 13
It is sulfoxide-benzene of 2mol/L as extractant that concentration is used unlike the present embodiment and embodiment 10 are unique, His condition is same as in Example 10, and the separative efficiency of resin and thorium is 84.66%.
Embodiment 14
Use concentration for the N- n-octyl caprolactam and benzene of 2mol/L unlike the present embodiment is unique from embodiment 10 Mixing organic phase as extractant, other conditions are same as in Example 10, and the separative efficiency of resin and thorium is 82.94%.
Embodiment 15
Recycling resin is precipitated, again by the resin of recycling in the lower clear liquid obtained after 10 extraction and separation of Example after cooling For the absorption of thorium, adsorption efficiency result is shown in Fig. 9.As shown in Figure 9, regenerated circulate operation, resin are adsorbed-extracted three times 90% or more still is maintained to the adsorption rate of thorium, adsorption capacity still reaches 15.44mg/g.

Claims (8)

1. a kind of responsive to temperature type Lauxite, which is characterized in that prepared by following steps: first by part urea be added to In formalin, adjusting pH value is 7.5~8.0, and 90~95 DEG C are warming up to after being uniformly mixed, and reacts 40~60min, reaction After to adjust pH be 4.0~4.5, the reaction was continued 40~60min, be cooled to 80~85 DEG C later, remaining urea be added, and PH to 6.0~6.5 is adjusted, 3~8min is reacted, cooling obtains responsive to temperature type Lauxite, the first after reaction The molar ratio of aldehyde and urea is 0.8~1.2.
2. a kind of method for preparing responsive to temperature type Lauxite as described in claim 1, which is characterized in that specific steps are such as Under: part urea is added into formalin first, adjusting pH value is 7.5~8.0, it is warming up to 90 after being uniformly mixed~ 95 DEG C, 40~60min is reacted, adjusting pH after reaction is 4.0~4.5, the reaction was continued 40~60min, is cooled to 80 later ~85 DEG C, remaining urea is added, and adjusts pH to 6.0~6.5, reacts 3~8min, cooling obtains temperature after reaction The molar ratio of responsive type Lauxite, the formaldehyde and urea is 0.8~1.2.
3. preparation method as claimed in claim 2, which is characterized in that the mass concentration of the formalin is 37%.
4. application of the responsive to temperature type Lauxite as described in claim 1 in heavy metal ion adsorbed processing.
5. application of the responsive to temperature type Lauxite as claimed in claim 4 in heavy metal ion adsorbed processing, feature Be, the specific method is as follows: using responsive to temperature type Lauxite as adsorbent, adsorb heavy metal-containing waste water in heavy metal from Son, after adsorption saturation, temperature is risen to lowest critical solution temperature or more by heating, and obtain resin and heavy metal ion coexists water Solution adds extractant and carries out liquid-liquid extraction, obtains resin aqueous solution through extraction and separation, recycled after being cooled to room temperature Resin.
6. application of the responsive to temperature type Lauxite as claimed in claim 5 in heavy metal ion adsorbed processing, feature It is, using the heavy metal ion in the method absorption heavy metal-containing waste water of constant temperature oscillation absorption.
7. application of the responsive to temperature type Lauxite as claimed in claim 5 in heavy metal ion adsorbed processing, feature It is, the concentration of the extractant is 1~4mol/L, and the pH for adsorbing environment is 1.0~6.0, and adsorption time is no less than 0.5h, adsorption temp are 10 DEG C~40 DEG C.
8. application of the responsive to temperature type Lauxite in heavy metal ion adsorbed processing as described in claim 5 to 7 is any, It is characterized in that, the extractant be selected from organic mixed phase of tributyl phosphate and benzene, organic mixed phase of sulfoxide and benzene or Organic mixed phase of N- n-octyl caprolactam and benzene.
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CN104448178B (en) * 2013-09-24 2017-04-19 南京理工大学 Urea-formaldehyde (UF) resin and method for removing boric acid in boron-containing waste liquor by using same
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