CN107824157A - Utilize the clay standby magnetic γ Fe of ferrimanganic2O3The method that sorbing material removes arsenic in water removal - Google Patents

Utilize the clay standby magnetic γ Fe of ferrimanganic2O3The method that sorbing material removes arsenic in water removal Download PDF

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CN107824157A
CN107824157A CN201711211345.1A CN201711211345A CN107824157A CN 107824157 A CN107824157 A CN 107824157A CN 201711211345 A CN201711211345 A CN 201711211345A CN 107824157 A CN107824157 A CN 107824157A
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water
arsenic
magnetic
ferrimanganic
adsorbent
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CN107824157B (en
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曾辉平
尹灿
李冬
张�杰
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Beijing University of Technology
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Beijing University of 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
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
    • 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
    • B01J20/28002—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
    • 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
    • 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
    • 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
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/48—Sorbents characterised by the starting material used for their preparation
    • B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
    • B01J2220/4887—Residues, wastes, e.g. garbage, municipal or industrial sludges, compost, animal manure; fly-ashes
    • 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
    • C02F2101/103—Arsenic compounds

Abstract

The invention provides one kind to utilize the clay standby magnetic γ Fe of ferrimanganic2O3The method that sorbing material removes arsenic in water removal.Underground water factory biological deferrization demanganization filter back washing is obtained sludge using solvent-thermal process mode and a kind of magnetic γ Fe has been made by this method2O3Material, the material has good adsorption effect to arsenic, and easily can be separated from the water out with magnet, repeats and recycles.By this water process scrap concrete and for going the arsenic pollution thing in water removal to solve waterworks sludge handling problems, and the ferro element for making to be rich in such sludge is fully used as a kind of resource, reagent cost has been saved, there is very big realistic meaning.

Description

Utilize the clay standby magnetic γ-Fe of ferrimanganic2O3The method that sorbing material removes arsenic in water removal
Technical field：
The invention belongs to environment water treatment field, and in particular to one kind utilizes the clay standby magnetic γ-Fe of ferrimanganic2O3Adsorption material The method that material removes arsenic in water removal.
Background technology：
Arsenic is that one kind common are malicious metalloid element in nature, by drinking water or can pass through skin, digestion The approach such as road, respiratory tract enter human body.Drink for a long time high arsenic water (>50 μ g/L), arsenic can accumulate for a long time in human body, cause skin The lesion of the organs such as skin, lung, liver, kidney, bladder, there is the risk that teratogenesis is carcinogenic.At present, the conventional technical method of water process arsenic removal has Coagulant sedimentation, absorption method, biological arsenic removal method, membrane separation process, ion-exchange etc..Absorption method as it is a kind of it is easy and effective, Dearsenicating method simple to operate is run, there is very big development prospect, searching is cheap, is easily recycled, the suction of excellent adsorption Enclosure material turns into the focus of research.
In recent years, adsorptivity of the domestic and foreign scholars to iron-based adsorbent and its with composite oxides of other metals etc. to arsenic It can study and give sizable concern, but most of these adsorbents are prepared with pure medicament.
Deferrization and demanganization water factory filter tank is during longtime running, when especially handled underground water iron-holder is very big, meeting Substantial amounts of ferriferous oxide is deposited under the filter membrane effect that filter material surface is formed, is a kind of excellent iron-based adsorbent.Removing of iron and manganese is filtered Pond can go out substantial amounts of sludge in filtrate gap when backwashing, and form ferrimanganic muddy water.These ferrimanganic mud yield are very high, and root Speculate that iron-holder is also considerable in backwash mud according to Removing Mechanism, if it will be a kind of that can these sludge be carried out with recycling Very effective changing rejected material to useful resource means, save reagent cost, and can effectively solve the problem that deferrization and demanganization to a certain extent Water factory's ferrimanganic sludge treatment problem.The ferrimanganic mud for having experiment to show to obtain underground water factory removing of iron and manganese filter back washing recently is dried The ferrimanganic mud powder obtained after grinding sieving, which is directly used in arsenic removal, has good adsorption effect, but this adsorbent is used for There is the defects of some are inevitable in the arsenic gone in water removal, such as due to shipwreck to separate after being handled the reason for its physical aspect Cause adsorbent recovery difficulty etc..
The content of the invention：
In order to avoid disadvantage mentioned above and this kind of water process discarded object can be made full use of, the invention discloses one kind by ferrimanganic mud Magnetic γ-Fe are made by solvent-thermal method2O3Sorbing material goes the method and its application of arsenic in water removal, is ensureing good arsenic removal While effect, the separation of adsorbent and water can be quickly realized by way of externally-applied magnetic field, recovery is simply.
It is provided by the invention to utilize the clay standby magnetic γ-Fe of ferrimanganic2O3The method that sorbing material removes arsenic in water removal, including with Lower step：
(1) magnetic γ-Fe2O3The preparation of sorbing material.
Water factory's deferrization and demanganization biofilter backwashing wastewater is staticly settled into 24h~72h, takes base sludge through natural air drying It is standby；Ethylene glycol, sodium acetate are separately added into ferrimanganic mud after the drying, 30~60min is sufficiently stirred and becomes mixing Even suspension；Gained suspension is put into closed reactor, is warming up to 160~200 DEG C, and react 8~14 at a constant temperature Hour；Question response kettle naturally cools to room temperature, discards upper liquid, and bottom sediment is taken out, with the alternately cleaning 6 of second alcohol and water ~8 times, magnetisable material is separated from the water out using externally-applied magnetic field；Gained magnetisable material is placed in drier and dried, is obtained To magnetic powder particles.
(2) by above-mentioned magnetic γ-Fe2O3Material is used for the removal of arsenic in water.
When the valence state of arsenic in water has As (III), in order to reach more preferable adsorption effect, oxidant is added into water, will As (III) is oxidized to As (V), adds pH adjusting agent regulation solution ph and is maintained between 3~10；When the valence state of arsenic in water only has During As (V), it is not required to add pre-oxidation agent.If solution ph is between 3~10, it is not necessary to adjusts pH value；Magnaglo is inhaled Attached dose is added in the arsenic-containing water by pretreatment, shakes 24h~36h, is separated from the water adsorbent using magnet.
Fe Elements Atoms accounting is 50%~95% in ferrimanganic mud used in step (1), ferrimanganic mud, sodium acetate and second The amount ratio of glycol is 1g:3g:0.03L~1g:6g:0.06L, drier drying temperature are 40~60 DEG C, dry 5~8h.
Oxidant described in step (2) is any one in hydrogen peroxide, liquid chlorine, sodium hypochlorite.The PH conditioning agents are HCl Solution and NaOH solution, molar concentration are 1~3mol/L.It is 0.2g/L that adsorbent, which adds the ratio between quality and arsenic-containing water liquor capacity, ~1g/L.Arsenic content is 0.01mg/L~40mg/L in the accessing pending water.
The advantage of the invention is that：
The made magnetic adsorbent of the invention has good absorption property to the arsenic in water, and is easy to be separated from the water Go out, organic efficiency is high, repeats and utilizes.And prepared by the useless mud of material use deferrization and demanganization water factory backwash, not only Ferro element in high ferro underground water is used, has saved reagent cost, and preparation method is simple, it is not necessary to harsh bar Part and cumbersome step.The invention provides a kind of new way for the disposal of such sludge, is truly realized and water process is given up The recycling of gurry.
Brief description of the drawings：
Fig. 1 is magnetic γ-Fe of the present invention2O3Sorbing material surface scan electron microscopic picture.
Fig. 2 is magnetic γ-Fe of the present invention2O3Sorbing material hysteresis curve.
Fig. 3 utilizes the clay standby magnetic γ-Fe of ferrimanganic for the present invention2O3Sorbing material go water removal in arsenic Langmuir and Freundlish Isothermal Model matched curves, wherein CeDuring to reach balance in solution As (V) concentration, mgL-1；qeFor up to To As during saturation (V) limit adsorbance, mgg-1。
Embodiment：
Embodiment 1：By deferrization and demanganization water supply plant stable operation stage biofilter backwashing wastewater by staticly settling 24h, taking base sludge, sludge Fe Elements Atoms accounting is 86.6% through drying for standby；Ethylene glycol 60mL is measured with graduated cylinder to put Among beaker, ferrimanganic mud 2.0g is sequentially added, anhydrous sodium acetate 11.0g is dissolved in ethylene glycol, stirring 45min becomes mixing Uniform suspension, gained suspension is put into closed reactor, is warming up to 180 DEG C, and react 10 hours at a constant temperature；Treat Reactor naturally cools to room temperature, discards upper liquid, and bottom sediment is taken out, and with alternately cleaning 6 times of second alcohol and water, utilizes Magnetisable material is separated from the water out by magnet；Gained magnetisable material is placed in drier, 60 DEG C of design temperature, dries 6h, Obtain magnetic γ-Fe2O3Powder particle.The adsorbent surface form scanning electron microscopic picture is as shown in Figure 1.From the figure, it can be seen that Made magnetic adsorbent possesses coarse surface and a large amount of holes, is advantageous to the progress of adsorption process.
Embodiment 2：By deferrization and demanganization water supply plant stable operation stage biofilter backwashing wastewater by staticly settling 24h, taking base sludge, sludge Fe Elements Atoms accounting is 80.5% through drying for standby；Ethylene glycol 40mL is measured with graduated cylinder to put Among beaker, iron cement 1.2g is sequentially added, anhydrous sodium acetate 6.5g is dissolved in ethylene glycol, it is equal that stirring 30min becomes mixing Even suspension, gained suspension is put into closed reactor, is warming up to 200 DEG C, and react 12 hours at a constant temperature；Treat anti- Answer kettle to naturally cool to room temperature, discard upper liquid, bottom sediment is taken out, with alternately cleaning 8 times of second alcohol and water, utilize magnetic Magnetisable material is separated from the water out by iron；Gained magnetisable material is placed in drier, 50 DEG C of design temperature, dries 7h, obtain To magnetic powder particles.Magnetic γ-Fe2O3The hysteresis curve that adsorbent measures at room temperature is as shown in Figure 2.Made magnetic γ- Fe2O3Powder sorbent shows typical S-shaped magnetization curve.Saturation magnetization is 16.95em μ g-1, remanent magnetization is strong Spend for 0.295em μ g-1, good paramagnetism is shown, can be very easily separated from the water using externally-applied magnetic field.
Embodiment 3：By above-mentioned magnetic γ-Fe2O3Adsorbent is used for the removal of arsenic in water.It is water-soluble to 90mL (III) containing As The hydrogen peroxide that 10mL percents by volume are 30% is added in liquid, it is molten to obtain a series of arsenic that concentration are 0.01mg/L~40mg/L Liquid.PH value of solution is 6.3~6.8, in the range of 3~10, is not required to add pH adjusting agent.By magnetic γ-Fe2O3Powder sorbent is thrown It is added in the arsenic-containing water by pretreatment, dosage 0.2g/L, 25 DEG C of concussion absorption 24h, using magnet by adsorbent from water Middle separation.The adsorbent is to the adsorption capacity of arsenic in water and the matched curve of Langmuir and Freundlish Isothermal Models as schemed Shown in 3, maximum adsorption capacity can reach 8.7mg/g.

Claims (6)

1. utilize the clay standby magnetic γ-Fe of ferrimanganic2O3The method that sorbing material removes arsenic in water removal, it is characterised in that including following step Suddenly：
(1) magnetic γ-Fe2O3The preparation of sorbing material；
Water factory's deferrization and demanganization biofilter backwashing wastewater is staticly settled into 24h~72h, takes base sludge standby through natural air drying With；Be separately added into ethylene glycol, sodium acetate in ferrimanganic mud after the drying, be sufficiently stirred 30~60min become it is well mixed Suspension；Gained suspension is put into closed reactor, is warming up to 160~200 DEG C, and reaction 8~14 is small at a constant temperature When；Question response kettle naturally cools to room temperature, discards upper liquid, and bottom sediment is taken out, with second alcohol and water alternately cleaning 6~ 8 times, magnetisable material is separated from the water out using externally-applied magnetic field；Gained magnetisable material is placed in drier and dried, is obtained Magnetic powder particles；
(2) above-mentioned magnetic adsorbent is used for the removal of arsenic in water；
When the valence state of arsenic in water has As (III), oxidant is added into water, As (III) is oxidized to As (V), pH is added and adjusts Section agent regulation solution ph is maintained between 3~10；When the valence state of arsenic in water only has As (V), it is not required to add pre-oxidation agent. If solution ph is between 3~10, it is not necessary to adjusts pH value；Magnaglo adsorbent is added to and contains arsenic by pretreatment In water, concussion absorption 24h~36h, adsorbent is separated from the water using magnet.
2. according to the method for claim 1, it is characterised in that：Fe Elements Atoms accounting is 50% in used ferrimanganic mud ~95%.
3. according to the method for claim 1, it is characterised in that the dosage of ferrimanganic mud, sodium acetate and ethylene glycol in step (1) Than for 1g:3g:0.03L~1g:6g:0.06L.
4. according to the method for claim 1, it is characterised in that drying temperature is 40~60 DEG C in step (1), drying 5~ 8h。
5. according to the method for claim 1, it is characterised in that oxidant described in step (2) is hydrogen peroxide, liquid chlorine, two Any one in chlorine monoxid, the pH adjusting agent are HCl solution and NaOH solution, and molar concentration is 1~3mol/L.
6. according to the method for claim 1, it is characterised in that adsorbent adds quality and arsenic-containing water solution in step (2) The ratio between volume is 0.2g/L~1g/L, and it is 0.01mg/L~40mg/L to handle total arsenic content in water.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108940184A (en) * 2018-08-07 2018-12-07 东北师范大学 A method of magnetic adsorbent is prepared using underground water factory iron cement as raw material
CN108940183A (en) * 2018-08-07 2018-12-07 东北师范大学 A method of magnetic adsorbent is prepared using water factory's ferrimanganic sludge as raw material
CN110586024A (en) * 2019-10-18 2019-12-20 北京工业大学 Arsenic removal magnetic nano adsorbent gamma-Fe prepared based on biological filter backwashing iron mud2O3Method (2)
CN111974361A (en) * 2020-07-11 2020-11-24 复旦大学 Magnetic polydopamine hexavalent chromium reduction trapping agent based on sludge carrier and preparation method thereof
CN114405456A (en) * 2022-01-20 2022-04-29 广州大学 Gamma-Fe for uranium removal2O3Preparation method of @ HAP magnetic composite material

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108940184A (en) * 2018-08-07 2018-12-07 东北师范大学 A method of magnetic adsorbent is prepared using underground water factory iron cement as raw material
CN108940183A (en) * 2018-08-07 2018-12-07 东北师范大学 A method of magnetic adsorbent is prepared using water factory's ferrimanganic sludge as raw material
CN108940183B (en) * 2018-08-07 2020-12-22 东北师范大学 Method for preparing magnetic adsorbent by using waterworks ferro-manganese sludge as raw material
CN108940184B (en) * 2018-08-07 2021-02-02 东北师范大学 Method for preparing magnetic adsorbent by taking iron sludge of underground water plant as raw material
CN110586024A (en) * 2019-10-18 2019-12-20 北京工业大学 Arsenic removal magnetic nano adsorbent gamma-Fe prepared based on biological filter backwashing iron mud2O3Method (2)
CN111974361A (en) * 2020-07-11 2020-11-24 复旦大学 Magnetic polydopamine hexavalent chromium reduction trapping agent based on sludge carrier and preparation method thereof
CN111974361B (en) * 2020-07-11 2023-02-10 复旦大学 Magnetic polydopamine hexavalent chromium reduction trapping agent based on sludge carrier and preparation method thereof
CN114405456A (en) * 2022-01-20 2022-04-29 广州大学 Gamma-Fe for uranium removal2O3Preparation method of @ HAP magnetic composite material
CN114405456B (en) * 2022-01-20 2024-02-02 广州大学 Gamma-Fe for uranium removal 2 O 3 Preparation method of @ HAP magnetic composite material

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