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Graphene oxide loaded magnetic iron gold adsorption/photocatalyst, and preparation method and application thereof

A photocatalyst and graphene technology, applied in the field of water treatment, can solve the problems of high toxicity of toxic organic wastewater, unsatisfactory effect, and poor biodegradability

Active Publication Date: 2014-04-30
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the treatment methods of nitrophenol-containing wastewater at home and abroad mainly include physical and chemical methods, including extraction methods, adsorption methods, steam methods, and salting-out methods; chemical methods, including chemical precipitation methods, chemical oxidation methods, wet catalytic oxidation methods, etc. ; Biochemical methods, including biofilm method, activated sludge method, etc., although compared with physical and chemical methods, the biological treatment method is more convenient to operate and manage, but due to the high toxicity of toxic organic waste water, refractory degradation, and poor biodegradability, the amount of treatment effect of traditional methods still not ideal

Method used

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  • Graphene oxide loaded magnetic iron gold adsorption/photocatalyst, and preparation method and application thereof
  • Graphene oxide loaded magnetic iron gold adsorption/photocatalyst, and preparation method and application thereof
  • Graphene oxide loaded magnetic iron gold adsorption/photocatalyst, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0024] A preparation method for the base magnetic iron gold adsorption / photocatalyst supported by graphite oxide, comprising the following steps:

[0025] 1) Preparation of iron / gold core-shell nanoparticles: add 20mL, 0.1M ascorbic acid solution to 4mL, 0.01M Fe(NO 3 ) 3 In the solution, react in a nitrogen environment for 20min, adjust the pH to 4.0, add 4mL, 0.01M HAuCl 4 The solution was reacted for 1 hour, and the product was separated by a magnet, washed with water, and dried under vacuum at 25°C.

[0026] 2) Preparation of graphene oxide: add 25mL, 98% concentrated sulfuric acid solution, 5g K 2 S 2 o 8 Solid, 5g P 2 o 5 Solid, 5g of graphite, heated to 80°C and maintained for 6 hours, then cooled to 20°C, diluted with 1L of ultrapure water, and allowed to stand for 12 hours. Filter the oxidized graphite and wash it with pure water, dilute it with 250mL, 98% concentrated sulfuric acid solution below 0°C, add 30g KMnO 4 Solid, heat the flask to 35°C, keep it for...

Embodiment 2

[0030] Use the iron / gold core-shell nano-catalytic material prepared in Example 1 to catalytically degrade 4-NP: take 25mL of NaHB with a concentration of 0.06mol / L 4 Solution, placed in a 250mL Erlenmeyer flask, add 100mL concentration to 1.0×10 -4mol / L 4-NP solution, and then add 5 mL of the iron / gold core-shell nanocatalyst material prepared in Example 1 with a concentration of 1.4 g / L to adjust the pH to 7.2. The mixed system was kept in the dark for 30 min at room temperature to achieve adsorption-desorption equilibrium. Turn on the xenon light source, use a cut-off filter to obtain visible light with a wavelength of 400nm, take samples regularly and use a shimadzu UV2550 ultraviolet / visible spectrophotometer with a diode array detector to measure 4-NP in the solution.

[0031] Taking graphene oxide as a control, the results are as follows figure 2 and image 3 as shown, figure 2 is the adsorption equilibrium diagram of graphene oxide on 4-NP, image 3 It is the de...

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Abstract

The invention discloses a graphene oxide loaded magnetic iron gold adsorption / photocatalyst, and a preparation method and application thereof. The photocatalyst degrades non-biodegradable pollutants like nitrophenol in the waste water when irradiated by visible light, specifically, an ascorbic acid solution firstly reduces a ferric nitrate solution, then a chloroauric acid solution is added for reduction after the pH is regulated, iron gold core-shell nanoparticles are prepared, then the iron gold core-shell nanoparticles are synthesized through a mixed solution of a graphene oxide suspension liquid prepared through the oxidization of graphite and a p-aminothiophenol solution to prepare the iron gold core-shell nano-photocatalyst loaded on the graphene oxide. The photocatalyst has both efficient adsorption effect and catalytic action on nitrophenol, the degradation rate of the nitrophenol is up to 93% in a shorter period of time, and a positive effect is exerted on improving the quality of the waste water. The catalyst is magnetic and is recovered only by applying a magnetic field externally, and the degradation efficiency is not remarkably lowered after the catalyst is repeatedly used.

Description

technical field [0001] The invention belongs to the field of water treatment, and relates to a magnetic iron-gold adsorption / photocatalyst supported by graphene oxide of nitrophenol (such as 4-NP), which can be used for wastewater treatment, and a preparation method and application thereof. Background technique [0002] As an important chemical raw material, nitrophenol compounds have important applications in the production of pesticides, medicines, dyes, explosives, papermaking and rubber industries, and are widely present in wastewater discharged from coking and gas production enterprises. Large, refractory, and "carcinogenic, teratogenic, and mutagenic" and other characteristics, they are not easy to decompose under natural environmental conditions, and can be enriched to a relatively high concentration in biological organisms with the transfer of the food chain, which is harmful to the ecological environment and human health. A potential threat that falls under strict n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01J23/89C02F1/28C02F1/30C02F101/38
Inventor 李轶臧怡文胡磊李林泽张文龙
Owner HOHAI UNIV
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