Green synthesis and photo-catalytic performances for ZnO-reduced graphene oxide nanocomposites
Green synthesis and photo-catalytic performances for ZnO-reduced graphene oxide nanocomposites
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ZnO还原氧化石墨烯纳米复合材料的绿色合成及光催化性能
DOI：
10.1016/j.jcis.2013.08.050
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发表时间：
2013-12-01
影响因子：
9.9
通讯作者：
Meng, Hong
中科院分区：
文献类型：
--
作者：
Li, Xueshan;Wang, Qian;Meng, Hong
以氯化锌和氧化石墨粉为前驱体，采用水热一步法合成了氧化锌还原氧化石墨烯(RGO)纳米复合材料。研究了常温下模拟太阳光照射下的光催化降解罗丹明B(RhB)和光还原CO2的性能。结果表明，由平均直径为150 nm的氧化锌纳米棒组装而成的氧化锌球形颗粒均匀地沉积在RGO薄膜上。同时，由于RGO的引入，扩大了氧化锌的光吸附范围，减小了氧化锌的尺寸，提高了结晶度，有效地防止了氧化锌颗粒的自团聚。与纯的氧化锌颗粒相比，纳米复合材料对罗丹明B的光降解效率提高了39%，二氧化碳还原甲醇的产率提高了75%。并对其光催化降解RhB和还原CO2性能的增强机理进行了探讨。(C)2013 Elsevier Inc.保留所有权利。
The zinc oxide (ZnO)-reduced graphene oxide (RGO) nanocomposites were greenly synthesized by one-step hydrothermal reaction with ZnCl2 and graphite oxide (GO) as precursors without extra reductant. The photo-catalytic performances consisting of the photo-degradation of Rhodamine B (RhB) and the photo-reduction of CO2 under the illumination of simulated solar light at ambient temperature were investigated. It was validated that the ZnO spherical particles assembled by ZnO nanorods with an average diameter of 150 nm are uniformly deposited on the RGO sheets. Meanwhile, due to the introduction of RGO, the light adsorption scope of ZnO is enlarged, the size of ZnO is decreased, the degree of crystallinity is improved and the self-aggregation of the ZnO particles is effectively prevented. Comparing with the pure ZnO particles, the efficiency of the nanocomposites for the photo-degradation of RhB is increased by 39% and the yield of methanol from the reduction of CO2 is improved by 75%. The mechanisms that may explain the enhanced properties of as-synthesized ZnO-RGO for both the photo-degradation of RhB and the reduction of CO2 were also proposed. (C) 2013 Elsevier Inc. All rights reserved.