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Method for treating alkaline papermaking wastewater by nanogold catalyst

A paper-making wastewater and nano-gold technology, applied in chemical instruments and methods, oxidized water/sewage treatment, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems that have not been reported, and achieve high economic and social Value, simple process, and the effect of reducing production costs

Inactive Publication Date: 2020-02-14
JINGGANGSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there is no report on the use of nano-gold catalysts to treat alkaline papermaking wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 0.1g HAuCl 4 ·3H 2 O to the deionized water of 3L, add 0.075g polyvinyl alcohol, then carry out reduction with the sodium borohydride of 0.1mol / L, wherein the mol ratio of sodium borohydride and gold is 4:1. Then add 10 g of nano-titanium oxide carrier, filter and dry after ultrasonication for half an hour to obtain a nano-gold / titanium oxide catalyst with a particle size of about 5 nm.

Embodiment 2

[0020] Add 0.15g HAuCl 4 ·3H 2 O to the deionized water of 3L, add 0.075g polyvinyl alcohol, then carry out reduction with the sodium borohydride of 0.1mol / L, wherein the mol ratio of sodium borohydride and gold is 4:1. Then add 10 g of activated carbon carrier, filter after ultrasonic half an hour, and dry to obtain a nano-gold / activated carbon catalyst with a particle size of about 7 nm.

Embodiment 3

[0022] The nano-gold / titanium oxide catalyst obtained in Example 1 is added to the papermaking wastewater whose pH is 14 and the mass percent concentration of cellulose organic matter is 2%, to obtain a uniform dispersion, which is quickly connected and stirred to decompose; The mass percent concentration of the gold / titanium oxide catalyst is 1%; the decomposition temperature is 25°C, and the decomposition time is 24 hours; then filtered, the nano-gold / titanium oxide catalyst is dried and collected for reuse, and the filtrate (clear liquid) is determined by liquid chromatography. Generate the content of glycerin, lactic acid, and oxalic acid in the products, so as to calculate the decomposition rate of cellulose, etc. The decomposition rate of available cellulose is 92%. And it is obtained by using titanyl sulfate solution as an indicator and using ultraviolet-visible light spectrophotometry to detect, and continuous hydrogen peroxide is generated during the decomposition pro...

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Abstract

The invention provides a method for treating alkaline papermaking wastewater by a nanogold catalyst, wherein the method comprises the steps: adding the nanogold catalyst into the alkaline papermakingwastewater to form a dispersion liquid; rapidly and continuously stirring or introducing oxygen, and decomposing, wherein the alkaline papermaking wastewater contains cellulose organic matters, and the pH value of the alkaline papermaking wastewater is 10-14. The nanogold catalyst promotes the reaction of the cellulose organic matters and oxygen, so that continuous hydrogen peroxide is generated,the chemical oxidative degradation of the organic matters in the wastewater is promoted, alcohol, organic acid, carbon dioxide, water and the like with low molecular weight are obtained, the decomposition rate of cellulose reaches 85% or above, and the advanced treatment of the papermaking wastewater is realized. Meanwhile, the method is simple in technological process, other oxidizing agents or additives do not need to be additionally added, the production cost is remarkably reduced, the method is directly carried out in a room-temperature air environment, and secondary pollution is not introduced.

Description

technical field [0001] The invention relates to the field of papermaking wastewater treatment, in particular to a method for advanced treatment of papermaking wastewater by using a nano-gold catalyst at room temperature. Background technique [0002] Papermaking industry is an important chemical production process, but papermaking wastewater generally contains strong alkalinity, high chroma and high toxicity, which has caused serious pollution to the environment. At present, hydrogen peroxide is often used in the industry to oxidize papermaking wastewater. Although its raw materials are more environmentally friendly, the cost is high. Therefore, there is an urgent need for an easy-to-recovery and recyclable catalyst material for advanced treatment of papermaking wastewater to reduce the environmental protection pressure of production. . [0003] At present, there is no report on the use of nano-gold catalysts to treat alkaline papermaking wastewater. Contents of the inven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72B01J23/52C02F101/30C02F101/34C02F103/28
CPCC02F1/725C02F1/727B01J23/52C02F2103/28C02F2101/30C02F2101/34
Inventor 韩润林
Owner JINGGANGSHAN UNIVERSITY
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