Synthesis method of nano Schwertmannite for repairing arsenic-polluted soil

A technology of Shi's minerals and synthesis method, which is applied in the field of soil remediation, can solve problems such as unstable properties, large particle size, and affecting the yield of Shi's minerals, and achieve the effects of increasing yield, increasing adsorption capacity, and reducing production costs

Pending Publication Date: 2022-08-09
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Fe targeting Shi's minerals currently used for As pollution control 2+ The particle size of Shi's minerals in the oxidation deposition synthesis method is relatively large, and the explosive hazardous chemical H is used in the s

Method used

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  • Synthesis method of nano Schwertmannite for repairing arsenic-polluted soil
  • Synthesis method of nano Schwertmannite for repairing arsenic-polluted soil
  • Synthesis method of nano Schwertmannite for repairing arsenic-polluted soil

Examples

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Example Embodiment

[0035] Example

[0036] A nano-Sci' mineral synthesis method for remediating arsenic-contaminated soil, the synthesis method is to use sodium persulfate (Na 2 S 2O 8 ) as an oxidant, using high-viscosity sodium carboxymethyl cellulose as a stabilizer to synthesize nano-Sci’s mineral; wherein, the viscosity of high-viscosity sodium carboxymethyl cellulose is 5000-15000 mPa.s;

[0037] The synthetic method specifically includes the following steps:

[0038] Step 1, use pure water and sodium carboxymethyl cellulose to prepare a high-viscosity sodium carboxymethyl cellulose solution with a mass concentration of 0.3%, use pure water and FeSO 4 Configured to obtain FeSO with a concentration of 0.01mol / L 4 solution, using pure water and NaOH configuration to obtain a NaOH solution with a concentration of 0.3mol / L;

[0039] Step 2, first add the high viscosity sodium carboxymethyl cellulose solution configured in step 1 into the container, and then add the FeSO configured in step...

Example Embodiment

[0045] Experimental example:

[0046] 1. Characterization of the nano-Sci's minerals prepared in the examples:

[0047] 1) Pipette 20mL of nano-Sci' mineral suspension and filter it with a 0.22um membrane;

[0048] 2) The solid on the filter membrane in step 1) was quickly transferred to a freeze dryer, dried for 48 hours, and the obtained solid was subjected to X-ray diffraction (XRD) analysis and scanning electron microscope (SEM) analysis. The XRD patterns of nano-Science minerals are as follows: figure 1 As shown, the SEM image is as figure 2 shown.

[0049] figure 1 , the XRD pattern shows that the synthesized solid has 4 obvious characteristic diffraction peaks of Shishi mineral, indicating that the method has successfully synthesized Shi Shi mineral.

[0050] figure 2 Among them, the SEM images show that the synthesized nano-Science minerals are spherical in appearance, and the particle size is about 100-200 nm.

[0051] 2. Remediation effect of As-contaminated...

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Abstract

The invention discloses a nano Schwertmannite synthesis method for repairing arsenic-polluted soil. According to the nano Schwertmannite synthesis method, sodium persulfate (Na2S2O8) is used as an oxidizing agent, and high-viscosity sodium carboxymethyl cellulose is used as a stabilizer to synthesize nano Schwertmannite; wherein the viscosity of the high-viscosity sodium carboxymethyl cellulose is 5000 to 15000 mPa. S. The invention also discloses a preparation method of the high-viscosity sodium carboxymethyl cellulose. According to the method, the solid oxidizing agent Na2S2O8 is used for replacing a liquid oxidizing agent H2O2 to synthesize the nano Schwertmannite, so that the yield of the Schwertmannite and the safety of the production process are improved, and meanwhile, the production cost of the Schwertmannite is also reduced. The sodium carboxymethyl cellulose with the viscosity of 5000-15000 mPa.s is used as a stabilizer to inhibit deposition and aggregation of the Schwertmannite particles to form a suspension of the nano Schwertmannite, so that the adsorption capacity of the Schwertmannite to As can be effectively improved, and meanwhile, the application range of the Schwertmannite in the field of As contaminated soil remediation is widened.

Description

technical field [0001] The invention relates to the field of soil remediation, in particular to a method for synthesizing nanometer Schneider's minerals for remediating arsenic-contaminated soil. Background technique [0002] With the continuous migration and accumulation of arsenic (As) into the soil due to the irregular disposal and stacking of wastewater and waste residues from mining, smelting and other industries in recent decades, soil As pollution has become a major problem that plagues my country's food safety and ecological environment safety. As a class of inexpensive, readily available and environmentally friendly materials, iron-based minerals have broad application prospects in As-contaminated soil remediation. Iron-based minerals can stabilize As through adsorption co-precipitation, ion exchange, surface complexation and other mechanisms, reducing the water solubility and bioavailability of As in soil. Therefore, the development of an iron-based mineral materi...

Claims

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Application Information

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IPC IPC(8): C01G49/14C09K17/40C09K101/00
CPCC01G49/14C09K17/40C01P2002/72C01P2004/03C09K2101/00C01P2004/32C01P2004/62Y02P10/20
Inventor 李余杰张伟闫兵
Owner GUANGZHOU UNIVERSITY
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