化工新型材料

化工新型材料 ›› 2019, Vol. 47 ›› Issue (11) : 167-170.

科学研究

纳米MnO₂/羧甲基纤维素复合膜制备及光催化降解罗丹明B性能研究

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Preparation of nano-MnO₂/CMC composite film and its photocatalytic performance for degrading rhodamine B

Hu Yue, Li Pan, Lv Hongling, Wang Mingwang, Chen Jinqing

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Received		Published
2018-06-07		2019-11-20
Issue Date	Revised Date
2019-12-04	2018-06-07

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摘要

采用溶胶-凝胶法结合流延包覆方法制备纳米二氧化锰(MnO₂)/羧甲基纤维素(CMC)复合膜(纳米MnO₂/CMC复合膜),并对样品进行测试,复合膜催化剂呈MnO₂颗粒状自然堆积,颗粒间无团聚,表面光滑,纳米直径20nm±5nm,是高量子活性纳米MnO₂,MnO₂的含量为28.6%(wt,质量分数)。纳米MnO₂/CMC复合膜具有聚合物CMC的强溶胀吸附性和纳米MnO₂光催化活性,对催化降解罗丹明B印染废水效果明显。研究结果表明,在温度为20℃,pH=4.0,罗丹明B溶液浓度为100mg/L,复合膜用量为0.75g/L条件下,罗丹明B溶液的降解率达86.6%,吸附容量为8.09mg/g,处理后废水中的罗丹明B含量低于0.1mg/L,达到染料废水排入城镇下水道水质标准。

Abstract

Nano-MnO₂/CMC composite film was prepared by sol-gel combined with cast coating method.The results showed that the composite catalysts grown naturally in the form of particles and there was no agglomeration among the particles.With a smooth surface and a nanometer diameter of 20nm±5nm,it was a highly quantum active nano-MnO₂ with the MnO₂ content of 28.6%(wt,mass fraction).The composite films combined the strong swelling and adsorbability of the polymer by water and the high photocatalytic activity of nanometer MnO₂,and the films presented obvious photocatalytic efficiency for degrading rhodamine B wastewater.The concentration of wastewater and catalyst dosage were exhibited on the degradation rate of rhodamine B solution and the equilibrium adsorption capacity.The results shown that when the temperature was 20℃,pH=4.0,the concentration of rhodamine B solution was 100mg/L and the amount of composite film was 0.75g/L,the degradation rate of rhodamine B solution can be 86.6% with the adsorption capacity of 8.09mg/g.Finally,the discharge of rhodamine B in the treated wastewater was lower than 0.1mg/L,which met the water quality standard for sewage discharge into urban sewers.

关键词

纳米二氧化锰 / 羧甲基纤维素 / 罗丹明B / 光催化

Key words

nano-MnO₂ / carboxymethyl cellulose / rhodamine B / photocatalysis

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纳米MnO₂/羧甲基纤维素复合膜制备及光催化降解罗丹明B性能研究[J]. 化工新型材料, 2019, 47(11): 167-170 DOI:

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