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Method for preparing photocatalyst from camellia shells for heavy metal polluted wastewater treatment

A technology of Camellia oleifera husk and photocatalyst, which is applied in water/sewage treatment, adsorption water/sewage treatment, light water/sewage treatment, etc., can solve the problems of difficult desorption and recycling, and achieve stable and excellent photocatalytic performance Effect

Inactive Publication Date: 2019-08-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Modification of Camellia oleifera husk to prepare heavy metal adsorption materials, the cost is low, but it is difficult to desorb and recycle heavy metals after adsorption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Mix and impregnate camellia oleifera husk and phosphoric acid at a volume-to-mass ratio of 3:1 to 5:1 (mL / g) for 12 hours, then carbonize in a muffle furnace for 8 hours, rinse with water to pH=8 after cooling, dry, Pulverize and pass through a 100-mesh sieve to obtain the tea shell adsorption material;

[0026] (2) Put the tea shell adsorption material in cadmium-contaminated wastewater, after 6 hours of treatment, take it out and wash it with water of equal quality to the tea shell adsorption material for 4 times, dry it at 70°C, and grind it through a 200-mesh sieve;

[0027] (3) Take 45 parts by weight of heavy metal-loaded tea shell powder, 25 parts by weight of sulfur, and 17 parts by weight of water, mix and stir for 3 hours to obtain a uniform dispersion, pour the dispersion into a reaction kettle, conduct a hydrothermal reaction at 200°C for 12 hours, and cool to room temperature Afterwards, it was washed twice successively with water and ethanol of the sam...

Embodiment 2

[0030] (1) Mix and impregnate camellia oleifera husk with nitric acid at a volume-to-mass ratio of 3:1 to 5:1 (mL / g) for 13 hours, then carbonize in a muffle furnace for 7 hours, rinse with water to pH=7 after cooling, dry, Pulverize and pass through a 150-mesh sieve to obtain the tea shell adsorption material;

[0031] (2) Put the tea shell adsorption material in cadmium-contaminated wastewater, take it out after 7 hours of treatment, wash it with water of the same quality as the tea shell adsorption material for 5 times, dry it at 60°C, and grind it through a 300-mesh sieve;

[0032] (3) Take 50 parts by weight of heavy metal-loaded tea shell powder, 20 parts by weight of selenium powder, and 20 parts by weight of water, mix and stir for 4 hours to obtain a uniform dispersion, pour the dispersion into a reaction kettle, and conduct a hydrothermal reaction in an oven at 210°C for 14 hours After being cooled to room temperature, it was washed three times with water and ethanol...

Embodiment 3

[0035] (1) Mix and impregnate camellia oleifera husk and hydrogen peroxide at a volume-to-mass ratio of 3:1 to 5:1 (mL / g) for 14 hours, then carbonize in a muffle furnace for 8 hours, rinse with water until pH = 8 after cooling, Drying, crushing, and passing through a 200-mesh sieve to obtain the tea shell adsorption material;

[0036] (2) Place the tea shell adsorption material in cadmium and zinc polluted wastewater. After 6 hours of treatment, take out the tea shell adsorption material and wash it 4 times with water of equal quality, dry it at 70°C, and grind it through a 250-mesh sieve;

[0037] (3) Take 28 parts by weight of heavy metal-loaded tea husk powder, 35 parts by weight of 1M sodium sulfide solution, mix and stir for 4 hours to obtain a uniform dispersion, pour the dispersion into a reaction kettle, and perform a hydrothermal reaction in an oven at 220°C for 13 hours, then cool After reaching room temperature, it was washed twice with water and ethanol of the sam...

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PUM

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Abstract

The invention discloses a method for preparing a photocatalyst from camellia shells for heavy metal polluted wastewater treatment. The method comprises the following steps: activating, carbonizing, crushing and sieving the camellia shells to obtain a camellia shell adsorption material; placing the camellia shell adsorption material in wastewater to purify heavy metal polluted wastewater; reactingthe camellia shell adsorption material with heavy metal ions adsorbed with sulfur-containing and selenium-containing agents to obtain metal sulfide and metal selenide with photocatalytic performance,and performing hydrothermal synthesis to prepare the carbon-based photocatalyst. The photocatalyst can accelerate degradation of organic compounds under light. The invention provides a new method forpurifying the heavy metal polluted wastewater and recycling the heavy metal adsorption material to prepare the carbon-based photocatalyst, reutilization of waste resources is fully realized, and the method is economical and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of environmental protection and relates to the treatment of polluted wastewater, in particular to a method for preparing a photocatalyst from Camellia oleifera husks for the treatment of heavy metal polluted wastewater. Background technique [0002] With the rapid development of industrialization, the problem of water pollution has become increasingly serious, among which heavy metal pollution in water has become a prominent problem of water pollution. Heavy metal wastewater mainly comes from mine pit drainage, ore dressing plant tailings drainage, waste rock field leaching water, non-ferrous metal smelting plant dust removal drainage, non-ferrous metal processing plant pickling water, electroplating plant plating washing water, and electrolysis, pesticides, medicines, paints , pigments and other industrial wastewater, which contains a large amount of heavy metals such as cadmium, lead, chromium, copper and zinc. Was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J27/057B01J27/043B01J20/20B01J20/30C02F1/28C02F1/30C02F101/20C02F101/30
CPCB01J27/04B01J27/0573B01J27/043B01J20/20B01J20/3078C02F1/283C02F1/30B01J2220/4881C02F2101/20C02F2305/10C02F2101/308B01J35/39
Inventor 叶勇张萌
Owner SOUTH CHINA UNIV OF TECH
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