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Preparation and application of iron-sulfur co-doped biochar material for simultaneously removing lead-arsenic combined pollution

A compound pollution and co-doping technology, applied in water pollutants, water/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems of harsh preparation conditions, high cost, anaerobic storage, etc., and achieve good anti-interference ability , low cost, simple operation effect

Pending Publication Date: 2021-12-31
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Just like most iron-sulfur co-doped materials at present, the above-mentioned zero-valent iron sulfide and nano-iron sulfide also have problems such as easy oxidation and agglomeration, and the preparation process requires nitrogen and multiple calcinations, and the generated materials are extremely easy to oxidize Anaerobic storage is required, the preparation conditions are harsh, the cost is high, and usually only the removal of a single heavy metal is considered

Method used

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  • Preparation and application of iron-sulfur co-doped biochar material for simultaneously removing lead-arsenic combined pollution
  • Preparation and application of iron-sulfur co-doped biochar material for simultaneously removing lead-arsenic combined pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of iron-sulfur co-doped biochar: 10 g of rice straw powder was added to 100 mL of a suspension containing ferrous sulfate and sodium thiosulfate at a molar ratio of 1:1, magnetically stirred for 10 hours, and then freeze-dried. The dried solid was placed in a nitrogen atmosphere, pyrolyzed at 300 °C for 2 h at a heating rate of 5 °C / min, and washed with deionized water three times after cooling to prepare iron-sulfur co-doped biochar (Fe / S-BC) . The unmodified biochar was used for comparison.

[0022] Preparation of unmodified biochar: rice straw powder was placed in a nitrogen atmosphere, pyrolyzed at 300°C for 2 h at a heating rate of 5°C / min, and washed three times with deionized water after cooling to prepare unmodified biochar (BC ).

[0023] The BET test results are shown in Table 1, and the XPS results are shown in Table 1. figure 1 shown.

[0024] Table 1 BET test results of iron-sulfur co-doped biochar and unmodified biochar

[0025] ...

Embodiment 2

[0037] Preparation of iron-sulfur co-doped biochar:

[0038] Referring to Example 1, the difference is that the solid-to-liquid ratio of rice straw powder and suspension is 7g:100mL, the protective atmosphere is argon, and the heating rate is 10°C / min.

[0039] Removal of arsenic and lead experiment: carried out according to the method of Example 1, wherein the iron-sulfur co-doped biochar was 1g / L, and the pH value of the composite solution of As(III) and Pb(II) was 5. After the experiment, the percentage of arsenic and lead removal was measured. The results showed that the removal rate of As(Ⅲ) was 93.66%, and the removal rate of Pb(Ⅱ) was 91.93% when the reaction was balanced.

Embodiment 3

[0041]Preparation of iron-sulfur co-doped biochar: Referring to Example 1, the difference is that the molar ratio of ferrous sulfate and sodium thiosulfate in the suspension is 2:1, and the pyrolysis time is 3h , all the other are with embodiment 1.

[0042] Removal of arsenic and lead experiment: carried out according to the method of Example 1, wherein the iron-sulfur co-doped biochar was 1g / L, and the pH value of the composite solution of As(III) and Pb(II) was 5. After the experiment, the percentage of arsenic and lead removal was measured. The results showed that the removal rate of As(Ⅲ) was 94.21% and that of Pb(Ⅱ) was 95.68% when the reaction was balanced.

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Abstract

The invention relates to preparation and application of an iron-sulfur co-doped biochar material for simultaneously removing arsenic-lead combined pollution. The iron-sulfur co-doped biochar material is prepared by the following steps of: performing magnetic stirring on straw powder and turbid liquid containing ferrous sulfate and sodium thiosulfate according to a solid-to-liquid ratio of (7-12) g: 100mL for 10-36 hours; fully mixing the materials; performing freeze drying; and performing pyrolysis at 250-450 DEG C for 1-3 hours. The molar ratio of the ferrous sulfate to sodium thiosulfate in the turbid liquid is (0.7-2): 1. The iron-sulfur co-doped biochar can efficiently adsorb arsenic and lead in a combined polluted water body at the same time, the optimal removal rate of As (III) within 24 hours reaches 96% or above, and the removal rate of Pb (II) reaches 93% or above; and the removal rates of As (III) and Pb (II) can be kept above 90% under the condition that the pH is 3-6. The iron-sulfur co-doped biochar is obtained through one-time calcination after raw material impregnation, operation is easy, and the arsenic and lead removal effect is remarkable; and the iron-sulfur co-doped biochar has practical significance in treatment of industrial wastewater subjected to arsenic-lead combined pollution.

Description

technical field [0001] The invention belongs to the technical field of heavy metal treatment, and relates to the preparation and application of a modified biochar material for simultaneously removing lead and arsenic composite pollution. Background technique [0002] Lead and arsenic widely exist in nature. As the second of the "five poisonous elements" (cadmium, mercury, arsenic, lead, chromium), their impact on the environment and human health and safety has attracted widespread attention. The combined pollution of arsenic and lead in water is mainly produced in industrial processes such as smelting, mining, and electroplating. Trivalent arsenic As(Ⅲ) in water has high toxicity, mobility and solubility. Lead usually exists in wastewater in the form of Pb(II). Arsenic-lead compound pollution is not easy to be chemically or biologically degraded, and can be enriched in the human body through ingestion, which is extremely harmful to the stomach, intestines, liver, kidneys a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/10C02F101/20
CPCB01J20/20C02F1/283C02F2101/103C02F2101/20
Inventor 林亲铁陈怡君温小情李家琦吴礼滨杨丹琳何金
Owner GUANGDONG UNIV OF TECH
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