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Polysaccharide modified ferromanganese bimetallic material as well as preparation method and application thereof

A bimetallic and modified technology, applied in the field of soil and groundwater pollution remediation, can solve the problems of difficult technical operation, limited availability, limited solid properties, etc., to improve physical stability, prevent particle aggregation, and increase ratio The effect of surface area

Active Publication Date: 2018-05-04
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, most of the existing iron-manganese bimetallic materials are in the form of powders, which are generally used as filter column fillers, and are often used in the field of arsenic-containing wastewater treatment. The preparation process involves steps such as dehydration, calcination, and grinding. The process is cumbersome and the energy consumption is high. Moreover, limited by the solid nature of the material itself, large-scale drilling and mixing equipment is required for the restoration of deep-seated contaminated soil and groundwater to achieve the purpose of injecting and mixing the agent, which has high energy consumption, high cost, and difficult technical operation, which limits its use. in situ availability

Method used

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  • Polysaccharide modified ferromanganese bimetallic material as well as preparation method and application thereof
  • Polysaccharide modified ferromanganese bimetallic material as well as preparation method and application thereof
  • Polysaccharide modified ferromanganese bimetallic material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] As shown in the following table, different raw material ratios and synthesis conditions were used to prepare the materials:

[0033] ①Starch modification solution preparation: Weigh 5.0, 10.0, 15.0g soluble starch respectively, first disperse in a small amount of cold water, then add 1L of deionized water heated to 20 (room temperature), 40, 60, 80, 100°C, magnetically Continue heating under stirring conditions for 10, 20, 30 minutes. The results show that a clear and transparent starch solution can be obtained by stirring at 80-100° C. for 20-30 minutes. Cool to room temperature for the modification of the material.

[0034] ②Synthesis of starch-modified iron-manganese bimetallic material: Weigh 0.04-0.10mol FeSO 4 ·7H 2 O was dissolved in 500 mL of the above ① starch solution, KMnO 4 The molar ratio is 1 / 3 and 1 / 4 of the ferrous salt, which are respectively dissolved in an equal amount of starch solution, and then the ferrous sulfate starch solution is slowly added ...

Embodiment 2

[0040] Measure 10 mL of the materials in Example 1 and add them to 90 mL of As(III) and As(V) solutions with a concentration of 0.5 to 100 mg / L. The pH of the solution was adjusted to 7.0 with 0.1 mol / L NaOH in advance. Place the centrifuge tube in a water bath constant temperature oscillator at 25°C for 12 hours and rotate at 200rpm, take a sample through a 0.22μm water-based needle filter membrane, and set the As-containing starch solution without the above materials as a blank control, and use an atomic fluorescence spectrometer to measure Total As concentration. As adsorption amount of the material at different adsorption equilibriums=(CK-As concentration in the filtrate at adsorption equilibrium)×0.1L / mass of the material. The isotherm adsorption curve of described material to As(III) and As(V) is as follows Figure 4 As shown, the Langmuir equation is used to fit the isothermal adsorption data of the material to As, and the calculation can be obtained that its saturated...

Embodiment 3

[0044] The three tested soils were collected from Chenzhou (CZ) in Hunan, Zhuzhou (ZZ) in Hunan, and Fengshan in Guangxi (FS), all of which were As-contaminated soils caused by nearby mineral mining and processing activities, industrial waste residues and tailings. The total As content was 193mg / kg, 572mg / kg, 3384mg / kg respectively. Weigh 500g of different test soils respectively, add the materials described in Example 1 according to the solid-to-liquid ratio of 1:0.25, 1:0.5, 1:1, and 1:2, stir evenly, and seal the mouth of the beaker with a hydrophobic and air-permeable film. Cultivate at room temperature, fully stir once a day, and add an equal amount of deionized water as a control. After continuous cultivation for 15 days, samples were taken for solid-liquid separation, and placed in a centrifuge at 3,000 rpm for 15 minutes. The supernatant was passed through a 0.22 μm aqueous needle filter to determine As content, and the bottom soil was subjected to TCLP toxicity leachi...

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Abstract

The invention relates to a polysaccharide modified ferromanganese bimetallic material and a preparation method thereof, and application of the material in restoration of arsenic contaminated soil andunderground water. The material is medium brown colloid and is of an amorphous state structure. According to the preparation process, starch and xanthan gum are subjected to secondary modification, concentrations of the starch and xanthan gum are respectively 5.0-15.0g / L and 0.5-2.0g / L, and the molar ratio of the contained iron element to the contained manganese element is 3:1 to 4:1. The novel material prepared by the invention has the mean particle size of 50-200nm and the specific surface area of 155.7-285.5m<2> / g, has rich surface hydroxyl active sites and has dual effects of oxidative detoxification and adsorption on arsenic. The adsorption capacity on As (III) and As (V) in the water can respectively reach 284mg / g and 161mg / g, so that the TCLP (Toxicity Characteristic Leaching Procedure) toxic leaching concentration of the arsenic in soil is stably reduced by 60-95%. The material has high migration capacity in soil, sediments and underground water, can effectively enter a mediumlow-permeability zone and can be mixed into a soil and underground water contamination area in situ by virtue of a stirring or injecting manner, and the maximum migration distance can reach 5-12m.

Description

technical field [0001] The invention relates to a polysaccharide-modified iron-manganese bimetallic material for the restoration of arsenic-contaminated soil and groundwater, a preparation method and application thereof, and belongs to the technical field of soil and groundwater pollution restoration. Background technique [0002] Arsenic is a carcinogenic, teratogenic and mutagenic toxic element widely distributed in soil and groundwater. According to the World Health Organization, at least 50 million people in the world are facing the threat of endemic arsenic poisoning, and China is one of the countries most seriously affected by arsenic poisoning. Once the pollution of the environment by arsenic is formed, it will be difficult to eliminate in the environment, especially the pollution of water body and soil, which can eventually enter the human body through the food chain or surface water and groundwater and endanger human health, thus causing human and animal poisoning i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01J20/28B01J20/30B09C1/00B09C1/08C02F1/28C02F101/20
CPCB01J20/0211B01J20/0222B01J20/28016B01J20/28061B09C1/002B09C1/08B09C2101/00C02F1/28C02F2101/20
Inventor 阎秀兰费杨
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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