氧化锌/石墨烯复合材料的制备及其光催化性能

doi:10.12066/j.issn.1007-2861.2040

摘要/Abstract

摘要：

印染废水具有色度深、毒性大和可生化性差等特点, 在被排放到自然水体之前, 对其进行有效的脱色和矿化处理是非常必要的. 效率高、环境友好的半导体光催化技术被认为是一种治理环境污染的有效方式, 而该技术的核心在于高效催化剂的设计. 氧化锌 (ZnO) 是一种常用的半导体催化剂, 但目前报道的 ZnO 存在比表面积小、催化效率欠佳等问题. 通过水热法设计合成了 ZnO/石墨烯 (graphene) 复合催化剂. 石墨烯的引入有效促进了半导体光生电子的迁移和光生载流子的分离, 使复合材料表现出增强的催化活性. 此外, 石墨烯作为吸附剂富集有机污染物分子, 提高了光催化反应过程中的传质效率. 在 100 min 的反应时间内, ZnO/Graphene 复合物样品对于亚甲基蓝 (methylene blue, MB) 溶液的脱色率高达 89.2%, 优于纯相 ZnO 的 59.0%.

关键词: 氧化锌 (ZnO), 光催化, 石墨烯, 亚甲基蓝

Abstract:

Dyeing wastewater has deep color, serious toxicity and poor biodegradability. As a result, it is necessary to decolour and mineralize it before entering seas or rivers. Semiconductor photocatalytic oxidation is considered as a promising technology for the degradation of persistent organic pollutant for its high efficiency and environmental friendliness, and the heart of this technology is to design the photocatalysts. As a common semiconductor, low specific surface area and low photocatalysis stay in the way of the application of zinc oxide (ZnO). In this study, graphene has been introduced to synthesize microspheres through a two-step hydrothermal reaction. On the one hand, graphene can absorb more pollutant due to its large area surface; on the other hand, it can act as electron receiver for its high conductivity, thereby declining the recombination of electron and hole, and improving the photocatalytic efficiency. The photocatalytic degradation study displayed the removal of methylene blue using pure zinc oxide and 1.0 % ZnO/RGO as catalysts were ca. 59.0% and ca. 89.2% (the highest) in 100 min, respectively, and the chemical oxygen demard (TOC) removals of methylene blue (MB) solution under the photocatalysis composite reaches 59.5%.

Key words: ZnO, photocatalysis, graphene, methylene blue (MB)

中图分类号:

O614.7

李琦, 罗志刚, 陈大勇, 黄守双, 胡张军, 陈志文. 氧化锌/石墨烯复合材料的制备及其光催化性能[J]. 上海大学学报(自然科学版), 2020, 26(3): 425-432.

LI Qi, LUO Zhigang, CHEN Dayong, HUANG Shoushuang, HU Zhangjun, CHEN Zhiwen. Preparation and photocatalytic properties of ZnO/graphene composite[J]. Journal of Shanghai University（Natural Science Edition）, 2020, 26(3): 425-432.

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