CN106430395A - Method of using hydrogel to adsorb heavy metals in water - Google Patents

Method of using hydrogel to adsorb heavy metals in water Download PDF

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CN106430395A
CN106430395A CN201610749867.6A CN201610749867A CN106430395A CN 106430395 A CN106430395 A CN 106430395A CN 201610749867 A CN201610749867 A CN 201610749867A CN 106430395 A CN106430395 A CN 106430395A
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hydrogel
heavy metal
water
adsorption
absorption
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樊李红
李亚
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Wuhan University of Technology WUT
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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
    • C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
    • 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
    • B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
    • 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
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—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 form
    • B01J20/28047—Gels
    • 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
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/34—Regenerating or reactivating
    • B01J20/345—Regenerating or reactivating using a particular desorbing compound or mixture
    • B01J20/3475—Regenerating or reactivating using a particular desorbing compound or mixture in the liquid phase
    • 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

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Dispersion Chemistry (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

The invention belongs to the field of high polymer chemical materials, and particularly relates to a method of using hydrogel to adsorb heavy metals in water. The method comprises the first step of preparing the hydrogel, wherein the first step comprises the procedures of mixing an oxidized sodium carboxymethyl starch solution and a carboxymethyl chitosan solution, stirring the mixture fully, and conducting still standing to obtain the hydrogel; conducting water washing and drying on the hydrogel for use; the second step of adding the dried hydrogel to waste water containing the heavy metals, and using the hydrogel to fully adsorb the heavy metals in water under certain conditions. According to the method of using the hydrogel to adsorb the heavy metals in water, the adsorption process of the hydrogel on cupric ions and nickel ions conforms to a monomolecular layer adsorption model and quasi-second order adsorption kinetics; the biggest adsorbing capacity of the hydrogel on the cupric ions is 158 mg/g; the adsorbing capacity of the hydrogel on the nickel ions is 298.4 mg/g; when the adsorption is over, by putting the hydrogel into a 1 mol/L saltpeter solution to be subjected to desorption and regeneration, the regenerated hydrogel can be recycled.

Description

A kind of method of utilization hydrogel adsorbed water body heavy metal
Technical field
The invention belongs to field of macromolecular chemical material is and in particular to a kind of utilization hydrogel adsorbed water body heavy metal Method.
Background technology
Because heavy metal is increasingly widely applied in human being's production and life, and can be directly or indirectly to big So that there are different heavy metal pollutions in environment in gas and water body, soil.Heavy metal pass through human respiratory tract, alimentary canal and The various approach such as skin is absorbed, and when these heavy metals are accumulated to a certain extent in human body, can directly affect human health Even life-threatening.For reducing the harm of heavy metal, the pollution administering heavy metal is always every country Study on Environmental Protection neck One of the emphasis in domain.
Hydrogel be a kind of through appropriately crosslinked and macromolecular material that there is three-dimensional net structure, because it has the suction of uniqueness Water, water conservation and bionical characteristic, are widely used in the fields such as industry, agricultural, medicine and biological engineering material.In recent years, water-setting Glue causes people widely to pay close attention in the research of water treatment field.Research shows, hydrogel has good absorption property, is answered For the heavy metal ion in Adsorption waste water, organic pollution, inorganic pollution etc..
Content of the invention
The present invention is directed to the deficiencies in the prior art it is therefore intended that providing one kind using a hydrogel adsorbed water body huge sum of money The method belonging to.
For achieving the above object, the technical solution adopted in the present invention is：
A kind of method of utilization hydrogel adsorbed water body heavy metal, comprises the steps：
(1) preparation of hydrogel：Oxidative carboxymethyl starch sodium solution is mixed with carboxymethyl chitosan solution, fully stirs Mix, stand after obtain hydrogel；Gained hydrogel is standby after washing, being dried；
(2) dried for step (1) hydrogel is added in heavy metal-containing waste water, makes hydrogel complete under certain condition The abundant absorption of heavy metal in water in pairs.
In such scheme, on the basis of 1L heavy metal-containing waste water, the dosage of the described hydrogel of step (2) is 1.5～2g.
In such scheme, described heavy metal is copper ion and nickel ion.
In such scheme, the described hydrogel of step (2) is added in heavy metal-containing waste water, is 15～35 DEG C, pH in temperature It is worth and complete the absorption to heavy metal in water for after absorption 20～24h under conditions of 1～6, stirring.
In such scheme, described hydrogel is 15 DEG C in temperature, and pH value is 6, and mixing speed is 200～300r/min condition The absorption to heavy metal in water is completed after lower absorption 20～24h.
In such scheme, the oxidizability of the described oxidative carboxymethyl starch sodium of step (1) is 60.3%～66.8%, relatively divides Protonatomic mass is 3.9～9.5 ten thousand.
In such scheme, the relative molecular mass of the described carboxymethyl chitosan of step (1) is 42～540,000.
In such scheme, the mass ratio 6 of the described oxidative carboxymethyl starch sodium of step (1) and carboxymethyl chitosan:5.
In such scheme, the described oxidative carboxymethyl starch sodium of step (1) is prepared via a method which to obtain：Form sediment to carboxymethyl Sodium metaperiodate is added, lucifuge reaction 7h, makes the part of hydroxyl on sodium carboxymethyl starch be oxidized at 30 DEG C in powder sodium solution After aldehyde radical, obtain oxidative carboxymethyl starch sodium.
In such scheme, the described carboxymethyl chitosan of step (1) is prepared via a method which to obtain：First shitosan is entered Row basification, is then dispersed in isopropanol, adds appropriate chloroacetic acid, reacts 5h in 60 DEG C, and products therefrom is post-treated After obtain carboxymethyl chitosan.
The present invention prepares hydrogel using oxidative carboxymethyl starch sodium and carboxymethyl chitosan for raw material, and oxidated carboxymethyl forms sediment Powder sodium and carboxymethyl chitosan heavy metal are respectively provided with adsorption capacity, contain substantial amounts of carboxylic group in both structures, with a huge sum of money Belong to ion and ion exchange can occur, thus realizing the absorption of heavy metal, the present invention selects the carboxymethyl after oxidation modification Sodium starch is raw material as crosslinking agent and carboxymethyl chitosan, makes prepared hydrogel have good biocompatibility, adsorption capacity Strong performance.Hydrogel of the present invention meets mono layer adsorption model and accurate two grades of suctions to the adsorption process of copper, nickel ion Attached dynamics；Maximal absorptive capacity to copper ion is 158mg/g；Adsorbance to nickel ion is 298.4mg/g；Absorption completes Afterwards, by hydrogel be placed in the salpeter solution of 1mol/L can desorption and regeneration, recycle.
Beneficial effects of the present invention：
(1), in the method for the invention, the preparation technology of hydrogel has the advantages that synthesis technique is simple, strong operability； Selected raw material (oxidative carboxymethyl starch sodium and carboxymethyl chitosan) is the preferable macromolecule of biocompatibility, to environment Harmless with human body, reduce the impact of toxic compounds, prepare gained hydrogel stable performance, good biocompatibility, by the external world Ambient influnence is less, is conducive to the sustainable development of environment.
(2) present invention passes through to control adsorption conditionses, and described hydrogel shows preferable absorption property to heavy metal in water (particularly to heavy metal in water copper ion and nickel ion), the absorption to copper ion, nickel ion for the heretofore described hydrogel Cheng Fuhe mono layer adsorption model and quasi- secondary absorption dynamics；Maximal absorptive capacity to copper ion is 158mg/g；To nickel from The adsorbance of son is 298.4mg/g；After the completion of absorption, hydrogel is placed in desorption and regeneration in the salpeter solution of 1mol/L, regeneration Hydrogel afterwards can be recycled.
Brief description
Fig. 1 is the infrared spectrum of the oxidative carboxymethyl starch sodium, carboxymethyl chitosan and hydrogel of embodiment 1,2,3 preparation Figure.
Fig. 2 is the scanning electron microscope diagram piece of the section of the hydrogel of adsorbable heavy metal of preparation.
Fig. 3 is the impact to hydrogel Adsorption of Heavy Metal Ions for the condition of different pH.
Fig. 4 is the impact to hydrogel Adsorption of Heavy Metal Ions for the condition of different temperatures.
Fig. 5 is the adsorption isotherm of hydrogel Adsorption of Heavy Metal Ions.
Fig. 6 is Langnuir the and Freundlich thermoisopleth simulation of hydrogel adsorption isotherm.
Fig. 7 is the curve of adsorption kinetics of hydrogel Adsorption of Heavy Metal Ions.
Fig. 8 is the pseudo-first-order of hydrogel Adsorption of Heavy Metals, pseudo-second order kinetic analog result.
Specific embodiment
For a better understanding of the present invention, it is further elucidated with present disclosure with reference to embodiment, but the present invention Content is not limited solely to the following examples.
The preparation of embodiment 1 oxidative carboxymethyl starch sodium
10g sodium carboxymethyl starch is dissolved in 200mL distilled water, adds appropriate sodium metaperiodate, reacts 7h in 30 DEG C of lucifuges, adds 2mL ethylene glycol and 3gNaCl stirring 15min terminating reaction, purify and obtain oxidative carboxymethyl starch sodium.After measured, oxidated carboxymethyl The oxidizability 62.8% of sodium starch, relative molecular mass is 3.9 ten thousand.The infrared figure through IR Characterization for this oxidative carboxymethyl starch sodium Spectrum is shown in Fig. 1, and compared with sodium carboxymethyl starch, oxidative carboxymethyl starch sodium new absworption peak at wavelength 1734.8, ownership In-CHO stretching vibration absworption peak it was demonstrated that the generation of oxidation reaction.
The oxidizability of oxidative carboxymethyl starch sodium adopts Cannizzaro reaction assay method.Accurately weigh fully be dried Oxidative carboxymethyl starch sodium 0.2g, in conical flask, adds 0.25mol NaOH standard liquid 10.00mL, and slowly vibration is dissolved Yellow solution.The solution having dissolved is placed in boiling water, controls warm time 1min, cool down 1min immediately in flowing water, molten Liquid is in buff, then, adds 0.5mol H2SO4Standard liquid 10.00mL, with a little distillation water wash conical flask wall, adds Half spoonful of activated carbon granule, fully sways, and filters to obtain water white transparency clarified solution, plus 2～3 phenolphthalein indicators, uses 0.25mol NaOH standard liquid is titrated, and is titrated to till colourless solution becomes blush and 30s can be kept colour-fast, reads and consumed NaOH standard liquid volume, be calculated as follows the oxidizability of sodium carboxymethyl starch：
In formula：V1The total mM of number (mmol) for NaOH standard liquid used；V2For H used2SO4The milli of standard liquid Molal quantity (mmol)；M is the molal weight (mg/mmol) of sodium carboxymethyl starch unit；M is dry oxidative carboxymethyl starch sodium Quality (mg).
The preparation of embodiment 2 carboxymethyl chitosan
10g NaOH is dissolved in distilled water, is made into the solution of 50wt%, after being cooled to room temperature, add 10g shitosan Freeze 48h in refrigerator after stirring, in the there-necked flask that the shitosan through basification is placed in 500mL, add The isopropanol of 200mL, adds appropriate chloroacetic acid under agitation, after reaction 5h at 60 DEG C, through filtering, dissolving, and dialysis, dense Contracting, obtains carboxymethyl chitosan after being dried.The infrared spectrogram of the IR Characterization of carboxymethyl chitosan is shown in Fig. 1.In wavelength The absworption peak occurring at 1597.1 and 1411.4 belongs to the asymmetric of-COOH and symmetrical stretching vibration peak, illustrates in shitosan On introduce carboxyl, generate carboxymethyl chitosan, the molecular weight of carboxymethyl chitosan is 42.7 ten thousand.
The preparation of embodiment 3 hydrogel
Carboxymethyl chitosan is dissolved in distilled water and is configured to the aqueous solution that mass fraction is 5%, and oxidative carboxymethyl starch sodium is molten It is configured to the aqueous solution that mass fraction is 10% in distilled water；The carboxymethyl chitosan solution measuring 10mL is placed in beaker, so Add the oxidative carboxymethyl starch sodium solution of 6mL afterwards, standing obtains hydrogel after being sufficiently stirred for.The hydrogel preparing is put Enter drying for standby in drying box.The infrared spectrogram of the IR Characterization of hydrogel is shown in Fig. 1.The infrared spectrogram of hydrogel is in wavelength The absworption peak occurring at 1624.6, belongs to-N=C- stretching vibration, its appearance prove amino on carboxymethyl chitosan with Aldehyde radical on oxidative carboxymethyl starch sodium there occurs schiff base reaction.
Embodiment 4
The method preparing gained hydrogel adsorbed water body heavy metal using embodiment 3, comprises the steps：Weigh dry Hydrogel 0.2g, is added separately to 100mL, the Cu of initial concentration 1g/L2+、Ni2+Solution, puts into 15 DEG C in constant temperature oscillator, PH value is 6, under the conditions of mixing speed 300r/min, thermostatic absorption 24h.After absorption terminates, measure each heavy metal ion solution and inhale Attached forward and backward concentration, assay method adopts ultraviolet spectrophotometry.Hydrogel is obtained to a huge sum of money by the concentration difference before and after absorption Belong to Cu2+、Ni2+Adsorption capacity.After measured, hydrogel is to Cu2+Adsorption capacity be 158mg/g；To Ni2+Adsorption capacity be 298.4mg/g.
Embodiment 5
Weigh several parts of embodiments 3 and prepare gained hydrogel 0.2g.Cu by concentration 1g/L preparing 100mL2+、Ni2+ Heavy metal ion solution is placed in conical flask, using HNO3Adjusting pH value of solution is 1,2,3,4,5,6, adds the water-setting of weighing Glue, puts in constant temperature oscillator, 25 DEG C of thermostatic absorption 24h.After absorption terminates, measured after absorption with ultraviolet-visible spectrophotometry The concentration of heavy metal ion, measurement result is shown in Fig. 3.As can be seen from Figure 3, must raise with pH value, hydrogel heavy metal ion Adsorption capacity increases, this is because containing substantial amounts of-COOH in hydrogel, when pH becomes big ,-COOH group the degree of dissociation increases, Complexing power strengthens, and therefore, adsorbance increases therewith, conversely, adsorbance reduces.
Embodiment 6
Using HNO3Adjusting pH value of solution is 6, adjusts adsorption temp and is 15 DEG C, 20 DEG C, 25 DEG C, 30 DEG C, 35 DEG C, repeats to implement The method of example 5, studies temperature adsorbing impact on hydrogel.Measurement result is shown in Fig. 4, as can be seen from Figure 4, for Cu2+、Ni2+ Temperature impact experiment in, hydrogel is to Cu2+、Ni2+Adsorption capacity be as the liter high-adsorption-capacity of temperature and all reduce. When temperature is when increasing to 35 DEG C for 15 DEG C, Cu2+Adsorption capacity be reduced to 83.7mg/g from 158.7mg/g, reduce 75mg/g； Ni2+Adsorption capacity be reduced to 180.3mg/g from 298.4mg/g, reduce 118.1mg/g, when temperature is increased to 35 DEG C, water Gel is to Ni2+Adsorption capacity reduce rapid.
Embodiment 7
Weigh the hydrogel 0.2g of several parts of dryings, be added separately to the Cu being 0.1～2g/L containing 100mL, initial concentration2 +、Ni2+In the 250mL conical flask of solution, 25 DEG C of thermostatic absorption 24h in constant temperature oscillator.After absorption terminates, measure each heavy respectively The forward and backward concentration of metal ion solution absorption, assay method adopts ultraviolet spectrophotometry.Measurement result is shown in Fig. 5, can from Fig. 5 Know, hydrogel can be obtained to heavy metal Cu under each initial concentration by the concentration difference before and after absorption2+、Ni2+Adsorption capacity.
Embodiment 8
Embodiment 6 adsorption curve is carried out with the simulation of Langnuir and Freundlich thermoisopleth.Wherein Langnuir is linear Equation can be expressed as：
In formula, k1For the Langmuir equilibrium constant；n、k2For Freundlich equation constant；Qe is hydrogel heavy metal The adsorption capacity of ion, mg/g；The concentration of heavy metal ion, mg/L during Ce adsorption equilibrium；Qm is hydrogel heavy metal ion Saturated extent of adsorption, mg/g；
According to above-mentioned equation, the heavy metal ion under two kinds of initial concentrations is made with Ce/Qe～Ce and InQe～InCe figure, by Linear analogue obtains Langnuir, the k of Freundlich model1With Qm and k2And n.Analog result and parameter are shown in Fig. 6.By simulating Data draw, Langnuir thermoisopleth simulation variance R2It is all higher than 0.98, much larger than the simulation of Freundlich thermoisopleth Variance, illustrates that hydrogel Adsorption of Heavy Metal Ions more meets Langnuir Adsorption Model, adsorption process belongs to mono layer adsorption.
Embodiment 9
Take a series of 250mL conical flasks, be separately added into the 100mL1g/L single heavy metal that hydrogel 0.2g and pH is 6 from Sub- solution, studies hydrogel heavy metal ion Cu2+、Ni2+Adsorption dynamics adsorption kinetics.Oscillating reactions at 25 DEG C, when different Between (0,15min, 30min, 1h, 2h, 3h, 4h, 6h, 8h, 10h, 21h, 24h, 48h and 72h) respectively take out a conical flask, with purple Outer visible spectrophotometer measures the adsorbance to two heavy metal species ions for the hydrogel under different time.Measurement result is shown in Fig. 7.
Embodiment 10
The adsorption dynamics adsorption kinetics of research hydrogel heavy metal ion, is different time in initial concentration is for the solution of 1g/L The adsorption capacity of interior hydrogel heavy metal ion is detected.The adsorbance data determining is made with adsorption dynamics adsorption kinetics simulation, Including pseudo-first-order dynamics and pseudo-second order kinetic.Its equation is：
In (Qe-Qt)=- k1t+InQe
In formula, k1Be defined primary adsorption speed constant, h-1；k2The secondary absorption that is defined speed constant, g (mg h)-1；Qe, Qt be respectively during adsorption equilibrium and during t hydrogel heavy metal ion adsorption capacity, mg/g；T is adsorption time, h.
Wherein pseudo-first-order and quasi- secondary absorption dynamics simulation data are respectively with In (Qe-Qt)～t and t/Qt～t mapping. Analog result and parameter are shown in Fig. 8, table 2.
Can be drawn by Fig. 8, hydrogel is gradually increased with the growth of adsorption time for the adsorbance of two heavy metal species, During 24h, hydrogel basically reaches adsorption equilibrium to two kinds of ions, and in 0～10h, hydrogel has comparatively fast to two metal ion species The rate of adsorption；After 24h, hydrogel prolongation adsorbance change in time is inconspicuous.Be can be seen that by Fig. 8 analog result, right In Cu2+, the linear relationship of two kinds of dynamics simulation data is all relatively good, but pseudo-second order kinetic analog result will slightly be better than accurate one The dynamic (dynamical) analog result of level；For Ni2+, pseudo-second order kinetic analog result is substantially better than pseudo-first-order dynamics simulation result. Table 2 lists the relevant parameter of the dynamics simulation of two kinds of ions it can be deduced that being consistent with above-mentioned conclusion.
Table 2 adsorption dynamics adsorption kinetics analog parameter
Embodiment 11
Hydrogel, after three times recycle, still has stronger suction-operated.0.2g hydrogel is in 15 DEG C, pH value 6th, initial concentration 1g/L containing Cu2+、Ni2+After absorption 24h under conditions of heavy metal solution, mixing speed 300r/min, use The nitric acid of 1mol/L be desorbed (nitric acid of 1mol/L has stronger desorption ability to this hydrogel, desorption rate up to 94% with On).Hydrogel after desorption and regeneration can be reused for heavy metal ion adsorbed, by the hydrogel recycling three times and the Nonrecoverable hydrogel is to Cu2+、Ni2+Adsorbance contrasted, find：To Cu2+Adsorbance drop to from 158mg/g 147mg/g, to Ni2+Adsorbance drop to 274mg/g from 298.4mg/g.It can be seen that in the water through three desorption and regenerations Gel still has stronger adsorption capacity.
Obviously, above-described embodiment is only intended to clearly illustrate made example, and the not restriction to embodiment.Right For those of ordinary skill in the art, can also make on the basis of the above description other multi-forms change or Change.There is no need to be exhaustive to all of embodiment.And the obvious change therefore amplified or change Move within still in the protection domain of the invention.

Claims (10)

1. a kind of method using hydrogel adsorbed water body heavy metal is it is characterised in that comprise the steps：
（1）The preparation of hydrogel：Oxidative carboxymethyl starch sodium solution is mixed with carboxymethyl chitosan solution, is sufficiently stirred for, quiet Postpone and obtain hydrogel；Gained hydrogel is standby after washing, being dried；
（2）By step（1）Dried hydrogel is added in heavy metal-containing waste water, so that hydrogel is completed under certain condition right The abundant absorption of heavy metal in water.
2. method according to claim 1 is it is characterised in that on the basis of 1L heavy metal-containing waste water, step（2）Described water The dosage of gel is 1.5 ~ 2g.
3. method according to claim 1 is it is characterised in that described heavy metal is copper ion and nickel ion.
4. method according to claim 1 is it is characterised in that step（2）Described hydrogel is added to heavy metal-containing waste water In, temperature be 15 ~ 35 DEG C, pH value be 1 ~ 6, stirring under conditions of absorption 20 ~ 24h after complete the absorption to heavy metal in water.
5. it is characterised in that described hydrogel is 15 DEG C in temperature, pH value is 6 to method according to claim 4, stirring Speed is for completing the absorption to heavy metal in water after absorption 20 ~ 24h under the conditions of 200 ~ 300r/min.
6. method according to claim 1 is it is characterised in that step（1）The oxidizability of described oxidative carboxymethyl starch sodium For 60.3% ~ 66.8%, relative molecular mass is 3.9 ~ 9.5 ten thousand.
7. method according to claim 1 is it is characterised in that step（1）The average molecular matter of described carboxymethyl chitosan Measure as 42 ~ 540,000.
8. method according to claim 1 is it is characterised in that step（1）Described oxidative carboxymethyl starch sodium and carboxymethyl The mass ratio of shitosan is 6:5.
9. method according to claim 1 is it is characterised in that step（1）Described oxidative carboxymethyl starch sodium passes through as follows Method prepares：Add sodium metaperiodate in CMS sodium solution, lucifuge reaction 7h, makes CMS at 30 DEG C After part of hydroxyl on sodium is oxidized to aldehyde radical, obtain oxidative carboxymethyl starch sodium.
10. method according to claim 1 is it is characterised in that step（1）Described carboxymethyl chitosan is by the following method Prepare：First shitosan is carried out basification, be then dispersed in isopropanol, add appropriate chloroacetic acid, in 60 DEG C Reaction 5h, obtains carboxymethyl chitosan after products therefrom is post-treated.
CN201610749867.6A 2016-08-27 2016-08-27 Method of using hydrogel to adsorb heavy metals in water Pending CN106430395A (en)

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CN106944011A (en) * 2017-04-21 2017-07-14 武汉理工大学 A kind of hydrogel and its application for adsorbed water body heavy metal lead
CN110759412A (en) * 2019-10-31 2020-02-07 中国科学院生态环境研究中心 Method for synchronously treating desulfurization wastewater by in-situ crosslinking of double-network gel

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