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Water pollutant adsorbing material and preparation method thereof

A water pollutant and adsorption material technology, applied in the production and synthesis of environmental pollutant removers, can solve the problems of disappearing adsorption capacity, low mechanical strength, unsatisfactory effect, etc., and achieve simplified operation, low cost, wide acid-base The effect of scope

Pending Publication Date: 2019-12-24
INST OF GEOCHEM CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different materials have their own characteristics. In contrast, chitosan has good anion adsorption potential, but there are three problems: 1. Acidic conditions will cause it to dissolve and the adsorption capacity will disappear; 2. The adsorption capacity is poor under alkaline conditions; 3. Low mechanical strength, not easy to separate from water
However, the effect of purely using lanthanum as an adsorbent is not ideal.

Method used

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  • Water pollutant adsorbing material and preparation method thereof
  • Water pollutant adsorbing material and preparation method thereof
  • Water pollutant adsorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. The raw material for production is wheat straw. Firstly, the wheat straw was dried in an oven at 80° C., and then cut into 5 cm segments. Put 10 g of straw segments into the crucible, and use a tubular muffle furnace to feed N 2 Heated to 550°C at a heating rate of 10°C / min and held for 30 minutes. Then, turn off the heating and continue to turn on the N 2 to cool to room temperature. The prepared wheat straw biochar was ground to 150 μm. 10 g of ground wheat straw biochar was added to 1 L of 1M HCl and stirred overnight to remove ash, then washed with water, filtered, and vacuum-dried in an oven at 60 °C.

[0037] 2. Add 1 g of chitosan to 400 ml of 2% acetic acid solution, stir at 40° C. for 3 hours, then add 1 g of the above-mentioned wheat straw biochar. After continuing stirring for 1 hour, 1M NaOH solution was added to adjust the pH of the solution to 12, and stirring was continued at 40° C. for 2 hours. Afterwards, the mixture was filtered and washed wit...

Embodiment 2

[0047] 1. The raw material for production is landscaping pruning waste. The waste was first dried in an oven at 105°C, and then cut into 2 cm segments. Put 50 g of waste segments into the crucible, and use a tubular muffle furnace to feed N 2 Heated to 500°C at a heating rate of 5°C / min and held for 20 minutes. Then, turn off the heating and continue to turn on the N 2 to cool to room temperature. The produced biochar was ground to 100 μm. 50 g of ground wheat straw biochar was added to 5 L of 1M HCl and stirred overnight to remove ash, then washed with water, filtered, and vacuum-dried in an oven at 80 °C.

[0048] 2. Add 1g of chitosan to 400ml of 2% acetic acid solution, stir at 40°C for 2h, then add 1g of the above biochar. After stirring was continued for 1 hour, 1M NaOH solution was added to adjust the pH of the solution to 12, and stirring was continued at 40 °C for 3 hours. Afterwards, the mixture was filtered and washed with 4 L of water, and dried under vacuum ...

Embodiment 3

[0056] 1. The raw material for production is corn stalks. Firstly, corn stalks were dried in an oven at 100°C, and then cut into 5 cm segments. Put 10 g of straw segments into the crucible, and use a tubular muffle furnace to feed N 2 Heated to 550°C at a heating rate of 10°C / min and held for 30 minutes. Then, turn off the heating and continue to turn on the N 2 to cool to room temperature. The prepared corn stover biochar was ground to 150 μm. 10 g of ground wheat straw biochar was added to 1 L of 1M HCl and stirred overnight to remove ash, then washed with water, filtered, and vacuum-dried in an oven at 60 °C.

[0057] 2. Add 10 g of chitosan to 4000 ml of 2% acetic acid solution, stir at 40° C. for 3 hours, and then add 1 g of the above-mentioned corn stalk biochar. After continuing stirring for 1 hour, 1M NaOH solution was added to adjust the pH of the solution to 12, and stirring was continued at 40° C. for 2 hours. Afterwards, the mixture was filtered and washed wi...

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Abstract

The invention relates to a water pollutant adsorbing material and a preparation method thereof. The invention discloses a technical method for removing anionic pollutants in a water environment by black wood charcoal or biochar as a supporting material and successively supporting quaternary ammonium salt and lanthanum. The method is characterized by comprising the following steps: (1) preparing the black wood charcoal or biochar from biomass wastes or derivatives thereof as raw materials through a carbonization process; (2) loading chitosan on the biochar by using a method of firstly acidic treatment and secondly alkaline treatment; (3) protecting the amino group on the chitosan; (4) carrying out crosslinking on the chitosan subjected to amino protection; (5) carrying out amino release onthe cross-linked chitosan; (6) loading the quaternary ammonium salt on the charcoal chitosan complex after the amino group is released; and (7) loading the lanthanum to the charcoal chitosan complex loaded with the quaternary ammonium salt. The biochar modified product obtained by the technical scheme has the characteristics of strong pollutant removal capability, high speed, low lower limit concentration, wide applicable acid-base range, no temperature influence and the like, and provides a new way for removing anionic pollutants in a water environment.

Description

technical field [0001] The invention relates to a production and synthesis method of an environmental pollutant remover, in particular to a black carbon or biochar modification method. Background technique [0002] Water eutrophication and heavy metal pollution are major environmental problems facing mankind today. Regardless of the chemical form of the initial discharge of pollutants, most of them exist in the environment in the form of ions through migration and transformation in the environment, and the impact on the environment is also produced through the form of ions. For example, after the nutrients N and P are released into the water environment, they will eventually be converted into nitrate (NO 3 - ) and phosphate (PO 4 3- ), and in this form is used by algae to cause eutrophication of water bodies. Another example is that the heavy metal element Cr is finally converted into chromate (CrO2) after it is released into the water environment. 4 2- ) and the envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/10
CPCB01J20/20C02F1/28C02F2101/105
Inventor 李心清黄一敏雪莉 D·明特尔
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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