CN110102247A - A kind of zinc-iron layered double hydroxide adsorbent and its dephosphorization remove chromium application - Google Patents
A kind of zinc-iron layered double hydroxide adsorbent and its dephosphorization remove chromium application Download PDFInfo
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- CN110102247A CN110102247A CN201910347412.5A CN201910347412A CN110102247A CN 110102247 A CN110102247 A CN 110102247A CN 201910347412 A CN201910347412 A CN 201910347412A CN 110102247 A CN110102247 A CN 110102247A
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- double hydroxide
- layered double
- zinc
- adsorbent
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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
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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
- B01J20/28—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
- B01J20/28033—Membrane, sheet, cloth, pad, lamellar or mat
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
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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
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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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
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Inorganic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Water Treatment By Sorption (AREA)
Abstract
A kind of zinc-iron layered double hydroxide adsorbent is layered double hydroxide ZnFe-LDH.The sorbent preparation method includes weighing appropriate ZnSO4And FeSO4·7H2O is dissolved in distilled water；With the pH to 7.5 for using appropriate NaOH solution to adjust mixed solution under the conditions of magnetic stirrer；Persistently stir 2 hours；To mixed solution and dripping hydrogen peroxide；It is saved 4 hours under the conditions of 40 DEG C；It filters, the solid sediment of acquisition makes to be washed with deionized to neutrality；Drying, ground 100 mesh screen obtain ZnFe-LDH.Layered double hydroxide ZnFe-LDH prepared by the present invention has good adsorption effect to phosphate radical and Cr VI, the adsorbent is used to handle phosphorous, chromium stain disease, pollution problem of the phosphorus-containing wastewater to environment can be well solved, there is significant social value and researching value.
Description
Technical field
The present invention relates to a kind of zinc-iron layered double hydroxide adsorbents and its dephosphorization to remove chromium application, belongs to environmental protection
Technical field.
Background technique
In recent years since the soil erosion is serious, a large amount of soil erosions so that a large amount of phosphorous pesticides and chemical fertilizer in soil into
The waste water for entering water body and some farming animals animal husbandry discharge, causes the phosphorus content of water body exceeded without processing direct emission up to standard.Water
The exceeded harm of middle phosphorus content mainly has: (1) causing water eutrophication.When TP value is more than 0.2mg/L in water body, algae can be accelerated
The breeding of class, a large amount of aquatiles are dead due to dissolving hypoxgia to be even destroyed, and it is unbalance to eventually lead to water ecosystem.Separately
Outside, corpse can generate some toxic and harmful gas, deteriorate water quality further through peroxide decomposition after biological death.(2) cause
Wawter bloom, red tide etc..In fresh water after eutrophication, " wawter bloom " is frequent, and area is constantly spread, and the duration is also extending.I
Also all there is wawter bloom in state Taihu Lake, Chaohu, Dian Chi, and drinking water source is on the hazard, this is a needs urgent the problem of paying close attention to.When
When wawter bloom red tide occurs, the entire water surface is largely covered by algae, affects the beauty of water body, and the poisonous and harmful substance of generation is even more
Seriously threaten the development of sea farming, tourism etc..(3) rivers and lakes phosphorus content is exceeded may cause freshwater resources pollution sternly
Weight, influences daily life.If the water of the phosphorous pollution of people's long-term drinking will cause human poisoning, osteoporosis, skin is induced
The lesions such as skin cancer.Chromium mainly exists in the form of Cr (III) and Cr (VI) compound.Due to the dissolution of Cr (VI) in water
Property ratio Cr (III) is much higher, and toxicity is about 100 times of Cr (III).Cr (VI) is easy to be absorbed by the body, through digestion, respiratory tract or
Skin contact enters human body.Cr (VI) intrusion skin can make skin the diseases such as dermatitis, eczema even skin cancer occur；Human body connects for a long time
Chromate is touched, will lead to the digestive problems such as gastric ulcer, the reduction of taste smell susceptibility；It can also make one to suffer from nose containing smog and dust
The respiratory diseases such as mucosal ulcer.
Hydrotalcite and houghite are by positively charged metal hydroxides main layer and negatively charged interlayer anion group
At, be often referred to as layered double hydroxide (LDH), also referred to as Layered compound, have large specific surface area, interlayer yin from
The characteristics such as sub- exchange capacity is strong, thermal stability is good are a kind of excellent adsorbent materials；Most research is all to highlight LDH
Removal to anion, and having ignored it also has preferable removal effect to cation, fails to be effectively utilized.
Summary of the invention
The object of the present invention is to which in order to achieve the purpose that purifying water body, the present invention provides a kind of zinc-iron layered bi-metal hydrogen
Oxide adsorbent and its dephosphorization remove chromium application.
The technical solution that the present invention realizes is a kind of zinc-iron layered double hydroxide adsorbent, is layered bi-metal
Hydroxides Zn Fe-LDH.
A kind of layered double hydroxide ZnFe-LDH adsorbent, is prepared by following steps:
(1) 4.3134g ZnSO is accurately weighed4With 1.3901g FeSO4·7H2O (molar ratio Zn2+/Fe2+=3:1) dissolution
In 30ml distilled water；
(2) NaOH solution of 0.1mol/L is used to adjust mixed solution under continuous agitation using magnetic stirring apparatus
PH to 7.5；
(3) it is persistently stirred under the revolving speed of 300r/min 2 hours；
(4) hydrogen peroxide for being 6% to mixed solution and dripping mass fraction；
(5) it is saved 4 hours under the conditions of 40 DEG C；
(6) it filters, and the solid sediment of acquisition is made to be washed with deionized to neutrality；
(7) 60 DEG C of drying, ground 100 mesh screen obtain ZnFe-LDH.
The ZnSO4And FeSO4·7H2The molar ratio Zn of O2+/Fe2+=3:1.
The adsorbent is suitable for phosphorous chromium waste water Phosphate Sorption, chromium in pH for 4~7.
For the adsorbent under conditions of various concentration anion coexists, the influence sequence to Phosphate Sorption is CO3 2—>SO4 2—
>Cl—>NO3 —。
For the adsorbent under conditions of various concentration anion coexists, the influence sequence to absorption Cr (VI) is H2PO4 —>
SO4 2—>Cl—>NO3 —。
The invention has the advantages that layered double hydroxide ZnFe-LDH prepared by the present invention is to phosphate radical and six
Valence chromium has good adsorption effect, is used to handle phosphorous, chromium stain disease for the adsorbent, can well solve phosphorus-containing wastewater
Pollution problem to environment has significant social value and researching value.
Specific embodiment
Embodiment 1
Accurately weigh 4.3134g ZnSO4With 1.3901g FeSO4·7H2O (molar ratio Zn2+/Fe2+=3:1) it is dissolved in
In 30ml distilled water and continue to stir, while slowly to the NaOH solution of mixed solution and dripping 1.0mol/L, until mixing molten
Liquid pH reaches 7.5 or so and is held essentially constant, at the uniform velocity stirring 2h, then pair for being 6% to mixed solution and dripping mass fraction
Oxygen water, by Fe2+It is oxidized to Fe3+, 40 DEG C of aging 4h, by solid sediment filtering and washing to neutrality, 60 DEG C are dried, and ground 100
Mesh screen obtains ZnFe-LDH.
Taking concentration is that the phosphorous simulated wastewater 50ml of 25mg/L is put into stuffed conical flask, and pH is adjusted to 6, and ZnFe-LDH is added
0.08g stirs 4h in 25 DEG C, 180r/min magnetic stirring apparatus, and supernatant is filtered with 0.22 μm of needle tubing filter after absorption, meter
Calculating removal rate is 89.72%.
Embodiment 2
Operating method is the same as embodiment 1.
The phosphorous simulated wastewater 50ml of 50mg/L is taken to be put into stuffed conical flask, Cl—、NO3 —、SO4 2—、CO3 2—Ion concentration
Respectively 5,50mmol/L, pH value of solution are adjusted to 6, are separately added into ZnFe-LDH 0.05g (1g/L), in 25 DEG C, 180r/min magnetic force
4h is stirred in blender, supernatant is filtered with 0.22 μm of needle tubing filter after absorption, calculates what various concentration anion coexisted
Under the conditions of removal rate be respectively Cl—: 70%, 78.5%；NO3 —: 70.5%, 81.5%；SO4 2—: 58%, 69.8%；CO3 2—:
52.2%, 42.3%.Show that influence sequence of the counter anion to Phosphate Sorption is CO3 2—>SO4 2—>Cl—>NO3 —。
Embodiment 3
Operating method is the same as embodiment 1.
Take the 50ml containing Cr (VI) simulated wastewater of 10mg/L in stuffed conical flask, pH is adjusted to 7.5, and ZnFe-LDH is added
0.11g stirs 4h in 25 DEG C, 180r/min magnetic stirring apparatus, and supernatant is filtered with 0.22 μm of needle tubing filter after absorption, meter
Calculating removal rate is 86.7%.
Embodiment 4
Operating method is the same as embodiment 1.
Take the 50ml containing Cr (VI) simulated wastewater of 20mg/L in stuffed conical flask, Cl—、NO3 —、SO4 2—、H2PO4 —Concentration
Respectively 2,20mmol/L, pH value of solution are adjusted to 7.5, ZnFe-LDH 0.07g (1.4g/L) are separately added into, in 25 DEG C, 180r/min
4h is stirred in magnetic stirring apparatus, supernatant is filtered with 0.22 μm of needle tubing filter after absorption, and it is total to calculate various concentration anion
Removal rate is respectively Cl under conditions of depositing—: 75.2%, 74.3%；NO3 —: 76.7%, 76.5%；SO4 2—: 69.7%,
38.9%；H2PO4 —: 35.8%, 17.9%.Show that influence sequence of the counter anion to absorption Cr (VI) is H2PO4 —>SO4 2—>
Cl—>NO3 —。
Claims (5)
1. a kind of zinc-iron layered double hydroxide adsorbent, which is characterized in that the adsorbent is layered bi-metal hydrogen-oxygen
Compound ZnFe-LDH；
The adsorbent, is prepared by following steps:
(1) 4.3134g ZnSO is weighed4With 1.3901g FeSO4·7H2O is dissolved in 30ml distilled water；
(2) NaOH solution of 0.1mol/L is used to adjust the pH of mixed solution under continuous agitation using magnetic stirring apparatus
To 7.5；
(3) it is persistently stirred under the revolving speed of 300r/min 2 hours；
(4) hydrogen peroxide for being 6% to mixed solution and dripping mass fraction；
(5) it is saved 4 hours under the conditions of 40 DEG C；
(6) it filters, and the solid sediment of acquisition is made to be washed with deionized to neutrality；
(7) 60 DEG C of drying, ground 100 mesh screen.
2. a kind of zinc-iron layered double hydroxide adsorbent according to claim 1, which is characterized in that the ZnSO4
And FeSO4·7H2The molar ratio Zn of O2+/Fe2+=3:1.
3. a kind of zinc-iron layered double hydroxide adsorbent according to claim 1, which is characterized in that the absorption
Agent is suitable for phosphorous chromium waste water Phosphate Sorption, chromium in pH for 4~7.
4. a kind of zinc-iron layered double hydroxide adsorbent according to claim 3, which is characterized in that the absorption
Under conditions of various concentration anion coexists, the influence sequence to Phosphate Sorption is CO for agent3 2—>SO4 2—>Cl—>NO3 —。
5. a kind of zinc-iron layered double hydroxide adsorbent according to claim 3, which is characterized in that the absorption
Under conditions of various concentration anion coexists, the influence sequence to absorption Cr (VI) is H for agent2PO4 —>SO4 2—>Cl—>NO3 —。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910347412.5A CN110102247A (en) | 2019-04-28 | 2019-04-28 | A kind of zinc-iron layered double hydroxide adsorbent and its dephosphorization remove chromium application |
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| CN201910347412.5A CN110102247A (en) | 2019-04-28 | 2019-04-28 | A kind of zinc-iron layered double hydroxide adsorbent and its dephosphorization remove chromium application |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112588256A (en) * | 2021-01-28 | 2021-04-02 | 华东交通大学 | Magnetic nano bimetal oxide adsorbent and application thereof |
| CN115090254A (en) * | 2022-07-19 | 2022-09-23 | 中国计量大学 | Transition metal sulfide/NiCr LDHs composite material and preparation method and application thereof |
| CN115518610A (en) * | 2022-10-25 | 2022-12-27 | 菏泽学院 | Preparation of hollow flower ball-shaped adsorbent based on layered double hydroxides |
| CN115814753A (en) * | 2022-11-30 | 2023-03-21 | 中国科学院东北地理与农业生态研究所 | Preparation method of iron-calcium layered double hydroxide phosphorus removal agent |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104353406A (en) * | 2014-11-17 | 2015-02-18 | 海南大学 | Double hydroxide and preparation method thereof, as well as magnetic phosphorus removal adsorbent and preparation method thereof |
-
2019
- 2019-04-28 CN CN201910347412.5A patent/CN110102247A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104353406A (en) * | 2014-11-17 | 2015-02-18 | 海南大学 | Double hydroxide and preparation method thereof, as well as magnetic phosphorus removal adsorbent and preparation method thereof |
| CN104353406B (en) * | 2014-11-17 | 2017-06-30 | 海南大学 | A kind of double-metal hydroxide and preparation method thereof, magnetic dephosphorization adsorbent and preparation method thereof |
Non-Patent Citations (3)
| Title |
|---|
| D. CARRIAZO等: "A comparative study between chloride and calcined carbonate hydrotalcites as adsorbents for Cr(VI)", 《APPLIED CLAY SCIENCE》 * |
| NA GU等: "Microcystis aeruginosa inhibition by Zn–Fe–LDHs as photocatalyst under visible light", 《JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS》 * |
| 杨博凯等: "新型Zn-Fe-LDH 对磷酸盐的吸附与去除机理研究", 《水处理技术》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112588256A (en) * | 2021-01-28 | 2021-04-02 | 华东交通大学 | Magnetic nano bimetal oxide adsorbent and application thereof |
| CN115090254A (en) * | 2022-07-19 | 2022-09-23 | 中国计量大学 | Transition metal sulfide/NiCr LDHs composite material and preparation method and application thereof |
| CN115518610A (en) * | 2022-10-25 | 2022-12-27 | 菏泽学院 | Preparation of hollow flower ball-shaped adsorbent based on layered double hydroxides |
| CN115814753A (en) * | 2022-11-30 | 2023-03-21 | 中国科学院东北地理与农业生态研究所 | Preparation method of iron-calcium layered double hydroxide phosphorus removal agent |
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Application publication date: 20190809 |