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Heavy metal doped chlorine-containing mayenite photocatalytic material for degrading wastewater pollutants and preparation method thereof

A photocatalytic material and a technology for a catalytic material, which are applied in the field of heavy metal doped mayenite photocatalytic materials and their preparation, can solve problems such as environmental pollution, harm to human health, water and ground pollution, etc., and achieve the effect of high-efficiency photocatalytic degradation

Active Publication Date: 2021-12-07
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Antibiotic compounds such as ciprofloxacin (CIP), although they have excellent bactericidal ability and low toxicity and side effects, but a large amount of use of CIP antibiotics will lead to environmental pollution such as water, soil and groundwater, and even seriously endanger human health. ; Another example is that tetracycline antibiotics also have broad-spectrum antibacterial properties and good therapeutic effects. Will gather into the environment and cause water pollution
[0004] With the rapid development of my country's industrialization, heavy metal pollution in wastewater is becoming more and more serious, and high concentrations of chloride ions are also harmful

Method used

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  • Heavy metal doped chlorine-containing mayenite photocatalytic material for degrading wastewater pollutants and preparation method thereof
  • Heavy metal doped chlorine-containing mayenite photocatalytic material for degrading wastewater pollutants and preparation method thereof
  • Heavy metal doped chlorine-containing mayenite photocatalytic material for degrading wastewater pollutants and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Removal of Cr in wastewater 3+ and chloride ions to prepare a method of photocatalytic material:

[0028] Calcium oxide and aluminum hydroxide were uniformly mixed according to the Ca:Al molar ratio of 1:1, and calcined at 1700°C for 1 hour to obtain mayenite.

[0029] For Cr 3+ For 1L of wastewater with an ion content of 2000mg / L and a chloride ion content of 10000mg / L, the dosage of mayenite is added according to the mass ratio of mayenite to chloride ions at 9:1, and the precipitation reaction is carried out by stirring at 25°C for 60 minutes After the reaction, the solid-liquid separation was carried out, and the chloride ion content of the liquid part was determined by ion chromatography. The obtained solid part was calcined at 1700 ° C for 1 hour to obtain a Cr-doped chloride-containing mayenite photocatalytic material. The SEM morphology is shown in figure 1 , the material is a sheet-like structure.

[0030] The present embodiment is 90% for the chlorine r...

Embodiment 2

[0042] (1) Removal of Cd in wastewater 2+ and chloride ions to prepare a method of photocatalytic material:

[0043] Calcium oxide and aluminum hydroxide were uniformly mixed according to the Ca:Al molar ratio of 1.2:1, and calcined at 1200°C for 4 hours to obtain mayenite.

[0044] against Cd 2+ For 1L of waste water with an ion content of 5000mg / L and a chloride ion content of 20000mg / L, the dosage of mayenite is added according to the mass ratio of mayenite to chloride ion at 12:1, and the precipitation reaction is carried out by stirring at 120°C for 10 minutes After the reaction, the solid-liquid separation is carried out, and the chloride ion content of the liquid part is determined by ion chromatography, and the obtained solid part is calcined at 1000 ° C for 6 hours to obtain a Cd-doped chloromayenite photocatalytic material.

[0045] The chlorine removal efficiency to above-mentioned waste water is 99% in the present embodiment, heavy metal Cd 2+ The removal effici...

Embodiment 3

[0057] (1) Removal of Zn in wastewater 2+ and chloride ions to prepare a method of photocatalytic material:

[0058] Calcium oxide and aluminum hydroxide were uniformly mixed according to the Ca:Al molar ratio of 1.3:1, and calcined at 1000°C for 1 hour to obtain mayenite.

[0059] For Zn 2+ For 1L of wastewater with an ion content of 400mg / L and a chloride ion content of 3000mg / L, the dosage of mayenite is added according to the mass ratio of mayenite to chloride ions at 10:1, and the precipitation reaction is carried out by stirring at 75°C for 30 minutes After the reaction, the solid-liquid separation is carried out, and the content of chloride ions is measured by ion chromatography on the liquid part, and the obtained solid part is calcined at 200 ° C for 10 h to obtain a Zn-doped chloromayenite photocatalytic material.

[0060] The chlorine removal efficiency to above-mentioned waste water is 94.3% in the present embodiment, heavy metal Zn 2+ The removal efficiency rea...

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Abstract

The invention relates to a heavy metal doped chlorine-containing mayenite photocatalytic material for degrading wastewater pollutants and a preparation method thereof. The preparation method comprises the following steps: adding mayenite serving as a water treatment agent into wastewater containing chloride ions and heavy metal ions for stirring reaction; and after the stirring reaction is finished, calcining the separated solid part at the temperature of at least 200 DEG C to obtain the heavy metal doped chlorine-containing mayenite photocatalytic material. The heavy metal doped chlorine-containing mayenite photocatalytic material is used for photocatalytic degradation of organic pollutants in wastewater, and the organic pollutants comprise one or more of chlorophenol compounds, antibiotic compounds and azo dyes. The heavy metal doped chlorine-containing mayenite photocatalytic material obtained by the method has very effective photocatalytic degradation performance on wastewater pollutants, and the photocatalytic degradation rate on wastewater organic pollutants can reach 90% or above.

Description

technical field [0001] The invention relates to the technical field of waste water heavy metal and chloride ion resource utilization, in particular to a heavy metal-doped chloride-containing mayenite photocatalytic material for degrading waste water pollutants and a preparation method thereof. Background technique [0002] Chlorophenols (CPs) are toxic, difficult to biodegrade, and difficult to remove from the environment. The half-life of pentachlorophenol can reach 3.5 months in an aerobic environment, and the half-life of some organic precipitation substances can reach several years. Chlorophenols come from a wide range of sources, and can be found in groundwater, sewage, and soil, and even trace amounts of chlorophenols exist at all levels of the food chain. Chlorophenols in drinking water at concentrations lower than 0.1 μg / L produce unpleasant taste and odor and are harmful to the environment. Chlorophenols are present in both surface water and groundwater. The toxic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/138C02F1/30C02F101/30
CPCB01J27/138C02F1/30C02F2305/10C02F2101/30B01J35/39Y02W10/37
Inventor 黄寿强林嘉泓吕红映张雅珩陈苏樊超
Owner JIANGSU UNIV OF TECH