Method for preparing adsorbent for methylene blue and organophosphorus pesticide residues in water body by utilizing tea residues, prepared adsorbent and application

A technology of organophosphorus pesticides and methylene blue, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve problems such as aggravated environmental pollution, waste of resources, and few development channels, and achieve considerable economic benefits. Effect of adding value and increasing farmers' income

Inactive Publication Date: 2020-11-17
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of tea dregs will be produced in the process of tea processing. Due to the lack of development channels, only a small part of the tea dregs is used as feed or fertilizer, and most of them are directly incinerated, which not only wastes resources, but also aggravates environmental pollution.
At present, there is no report on the use of tea dregs to prepare adsorbents for the removal of organic dyes and organophosphorus pesticide residues represented by methylene blue in water.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of method utilizing tea dregs to prepare methylene blue and organophosphorus pesticide residue adsorbent in water body, comprises the following steps:

[0029] (1) Tea dregs pretreatment: pulverize the tea dregs with a pulverizer, pass through an 80-mesh sieve, and prepare tea dregs powder for subsequent use;

[0030] (2) Preparation of crude extract: Add tea residue powder to 10mol / L NaOH solution at a material-to-liquid ratio of 1g:20L, treat it in a water bath at 75°C for 4 hours, and remove the supernatant; the obtained precipitate is added at a material-to-liquid ratio of 1g:20L water, then add sodium chlorite with the same mass as the sample, adjust the pH value to 4.0 with hydrochloric acid, and remove the supernatant after treating at 75°C for 2 hours; add a certain volume fraction of 0.45% of The hydrogen peroxide was reacted until it was colorless, and the supernatant was removed; the obtained precipitate was washed with distilled water until neutral, e...

Embodiment 2

[0037] (1) Tea dregs pretreatment: pulverize the tea dregs with a pulverizer, pass through an 80-mesh sieve, and prepare tea dregs powder for subsequent use;

[0038] (2) Preparation of crude extract: add tea grounds powder to 10mol / L NaOH at a solid-liquid ratio of 1g:20L and treat it in a water bath at 75°C for 4h, remove the supernatant; add water to the obtained precipitate at a solid-liquid ratio of 1g:20L, and then Add sodium chlorite with the same mass as the sample, adjust the pH value to 3.5 with hydrochloric acid, and remove the supernatant after treating at 75°C for 2 hours; add a certain volume fraction of 0.45% hydrogen peroxide to the precipitate at a solid-liquid ratio of 1g:20L to react to Colorless, remove the supernatant; the resulting precipitate was washed with distilled water until neutral, eluted with ethanol with a volume fraction of 95%, and the crude extract was obtained after vacuum freeze-drying to constant weight;

[0039] (3) Adsorbent preparation:...

Embodiment 3

[0045] (1) Tea dregs pretreatment: pulverize the tea dregs with a pulverizer, pass through an 80-mesh sieve, and prepare tea dregs powder for subsequent use;

[0046] (2) Preparation of crude extract: add tea grounds powder to 10mol / L NaOH at a solid-liquid ratio of 1g:20L and treat it in a water bath at 75°C for 4h, remove the supernatant; add water to the obtained precipitate at a solid-liquid ratio of 1g:20L, and then Add sodium chlorite with the same mass as the sample, adjust the pH value to 4.0 with hydrochloric acid, and remove the supernatant after treating at 75°C for 2 hours; add a certain volume fraction of 0.30% hydrogen peroxide to the precipitate at a solid-liquid ratio of 1g:20L to react to Colorless, remove the supernatant; the resulting precipitate was washed with distilled water until neutral, eluted with ethanol with a volume fraction of 95%, and the crude extract was obtained after vacuum freeze-drying to constant weight;

[0047] (3) Adsorbent preparation:...

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PUM

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Abstract

The invention belongs to the technical field of food safety, and discloses a method for preparing an adsorbent for methylene blue and organophosphorus pesticide residues in a water body by utilizing tea residues, the prepared adsorbent and application. The method comprises the following steps: crushing tea residues serving as a raw material by using a crusher, and sieving by using an 80-mesh sieveto obtain tea residue powder; sequentially treating tea residue powder with a NaOH solution, sodium chlorite, hydrogen peroxide and ethanol to obtain a crude extract, adding the crude extract into ahydrochloric acid solution with a certain concentration according to a certain solid-to-liquid ratio, reacting in a water bath kettle with a certain temperature for a certain period of time, stoppingthe reaction, washing the obtained sample to be neutral, and drying the sample to obtain the adsorbent. The adsorbent has a removal effect on organic phosphorus pesticide residues such as organic dyestuff methylene blue and chlorpyrifos in a water body. The adsorbent is easily available in raw materials, simple in preparation method and low in cost; in addition, the adsorbent can also be used forremoving other organic pollutants in a water body.

Description

technical field [0001] The invention belongs to the technical field of food safety, and in particular relates to a method for preparing an adsorbent for methylene blue and organophosphorus pesticide residues in a water body by using tea dregs, and the prepared adsorbent and its application. Background technique [0002] With the rapid development of my country's industry and agriculture, the application of organic dyes in the industrial field and pesticides in agricultural production is becoming more and more extensive, and the amount of use is increasing. This has played a positive role in improving the quality and production efficiency of industrial and agricultural products. effect. But at the same time, the discharge of industrial and agricultural wastewater has caused organic dyes and pesticides to pollute the water body, which has brought great harm to the ecological environment and human health. Studies have shown that industrial dyes represented by methylene blue can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/30
CPCB01J20/24B01J2220/4887C02F1/286C02F2101/30C02F2101/308
Inventor 黄泽璇张媛媛
Owner SOUTH CHINA AGRI UNIV
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