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Preparation method and applications of lanthanum-loaded biochar arsenic-removing adsorbent

A biochar and adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve problems such as poor adsorption capacity, and achieve the effect of simple operation, low cost, and high success rate

Inactive Publication Date: 2015-08-05
JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface of biochar is negatively charged, and its adsorption capacity for pollutants in the form of anions (such as arsenic ions in arsenate) is poor, and surface or structural modification is needed to improve its adsorption capacity.

Method used

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  • Preparation method and applications of lanthanum-loaded biochar arsenic-removing adsorbent
  • Preparation method and applications of lanthanum-loaded biochar arsenic-removing adsorbent
  • Preparation method and applications of lanthanum-loaded biochar arsenic-removing adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Use corn stalks as raw materials, wash and remove impurities, air-dry, crush, and pass through a 2mm sieve. Add 10 g of sieved corn stalk powder to 100 mL solution containing 1.2 g lanthanum chloride heptahydrate, add NaOH solution dropwise to the above mixed solution while stirring until the pH of the mixed solution is 8, and continue stirring for 30 min. The product obtained by stirring is centrifuged at a centrifugal speed of 2000 rpm and a centrifugation time of 2 min. After the centrifugation, the supernatant is discarded, and the remaining sediment solid is washed with 95% ethanol until no Cl is detected in the eluent. - (using 0.1M AgNO 3 to test). The cleaned solids were dried to constant weight, placed in a muffle furnace for anaerobic roasting, raised to 200°C at a heating rate of 20°C / min, and kept at this temperature for 10 minutes, and the carbonized product was taken out after cooling to room temperature , using deionized water to wash repeatedly until t...

Embodiment 2

[0032] Use corn stalks as raw materials, wash and remove impurities, air-dry, crush, and pass through a 2mm sieve. Add 10 g of sieved corn stalks to 100 mL of solution containing 2.06 g of lanthanum chloride heptahydrate, add NaOH solution dropwise to the above mixed solution while stirring until the pH is 10, and continue stirring for 60 min. The product obtained by stirring is centrifuged at a speed of 3500 rpm and a centrifugation time of 5 min. After the centrifugation, the supernatant is discarded, and the remaining sediment solid is washed with 95% ethanol until no Cl is detected in the eluent. - (using 0.1M AgNO 3 to test). The cleaned solids were dried to constant weight, placed in a muffle furnace for anaerobic roasting, raised to 300°C at a heating rate of 20°C / min, and kept at this temperature for 20 minutes, and the carbonized product was taken out after cooling to room temperature , using deionized water to wash repeatedly until the pH of the eluent is neutral, ...

Embodiment 3

[0034] Use corn stalks as raw materials, wash and remove impurities, air-dry, crush, and pass through a 2mm sieve. Add 10 g of sieved corn stalks to 100 mL solution containing 3 g of lanthanum chloride heptahydrate, add NaOH solution dropwise to the above mixed solution while stirring until the pH is 12, and continue stirring for 300 min. The product obtained by stirring is centrifuged at a speed of 5000 rpm and a centrifugation time of 10 min. After the centrifugation, the supernatant is discarded, and the remaining sediment solid is washed with 95% ethanol until no Cl is detected in the eluate. - (using 0.1M AgNO 3to test). The cleaned solids were dried to constant weight, placed in a muffle furnace for anaerobic roasting, raised to 600°C at a heating rate of 20°C / min, and kept at this temperature for 100 minutes, and the charred product was taken out after cooling to room temperature , use deionized water to wash repeatedly until the pH of the eluent is neutral, dry, and ...

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Abstract

The present invention discloses a preparation method and applications of a lanthanum-loaded biochar arsenic-removing adsorbent. The preparation method mainly comprises: washing corn stalks, remove impurities, carrying out air-drying, crushing, screening, carrying out stirring mixing on the corn stalk powder and a lanthanum chloride solution under a certain condition, adjusting the pH value to the alkaline state, removing excess chlorine ions from the solution, and carrying out anoxybiotic calcination on the mixture for a certain time at a certain temperature so as to prepare the nanometer lanthanum oxide-loaded biochar material. According to the present invention, the prepared lanthanum-loaded biochar can be used for treating pentavalent arsenic ions in wastewater, and has characteristics of simple preparation, low cost, high adsorption efficiency, good application prospect, and the like.

Description

technical field [0001] The invention relates to a preparation method and application of a lanthanum-loaded biochar arsenic-removing adsorbent, which can be applied to the adsorption treatment of arsenic-polluted wastewater, and belongs to the related fields of wastewater treatment and agricultural resource utilization. Background technique [0002] In recent years, heavy metal pollution in water has become increasingly serious, and arsenic is one of the most important heavy metal pollutants in water. Direct discharge of arsenic-containing sewage will damage the ecological environment of water bodies and endanger human health. Long-term exposure to arsenic can cause skin cancer, lung cancer and other cancers. The World Health Organization stipulates that the maximum concentration of arsenic in drinking water is 0.01mg / L. Therefore, reducing the concentration of arsenic in water has always been the focus of research and attention. Existing arsenic removal technologies mainly...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/62
Inventor 冯彦房杨林章薛利红陈玉东杨梖何世颖侯朋福
Owner JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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