Ag-AgBr/TiO2/RGO nanocomposite: Synthesis, characterization, photocatalytic activity and aggregation evaluation.
Ag-AgBr/TiO2/RGO nanocomposite: Synthesis, characterization, photocatalytic activity and aggregation evaluation.
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DOI：
10.1016/j.jes.2016.04.032
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发表时间：
2017-06
影响因子：
6.9
通讯作者：
Penghua Wang
中科院分区：
文献类型：
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作者：
Penghua Wang
采用溶剂热-光还原法制备了不同氧化石墨烯（GO）/TiO 2质量比的Ag-AgBr/TiO 2/RGO（Ag-AgBr/TiO 2/RGO）复合材料。结果表明，在白色发光二极管（LED-W）照射下，GO/TiO 2质量比为1%的Ag-AgBr/TiO 2/RGO-1四组分纳米复合材料对青霉素G（PG）的光催化降解活性明显高于单组分、双组分和三组分纳米复合材料。当GO/TiO 2质量比从0.2%增加到1%时，PG降解率随GO/TiO 2质量比从1%增加到5%而降低。RGO-纳米复合材料的zeta电位变得更负与腐殖酸（HA）的存在下，由于带负电荷的HA吸附，导致零电荷的点移动到较低的pH值。由于HA的桥接效应的纳米复合材料的聚集更显着。此外，RGO-纳米复合材料的聚集颗粒尺寸比其他纳米颗粒更大，这是由于HA中的羧基和酚官能团与RGO-纳米复合材料中的含氧官能团的结合。微滤膜对纳米复合物的分离效果较好。在连续流浸没式膜光反应器（sMPR）系统中，反冲洗操作可以有效减少膜污染并回收TiO 2，从而间接促进PG的去除。
Ag–AgBr/TiO2supported on reduced graphene oxide (Ag–AgBr/TiO2/RGO) with different mass ratios of grapheme oxide (GO) to TiO2were synthesized via a facile solvothermal-photo reduction method. Compared to the single-, two- and three-component nanocomposites, the four-component nanocomposite, Ag–AgBr/TiO2/RGO-1 with mass ratio of GO to TiO2at 1%, exhibited a much higher photocatalytic activity for the degradation of penicillin G (PG) under white light-emitting diode (LED-W) irradiation. The PG degradation efficiency increased with the increase of mass ratio of GO to TiO2from 0.2% to 1%, then it decreased with the increase of mass ratio of GO to TiO2from 1% to 5%. The zeta potentials of RGO-nanocomposites became more negative with the presence of humic acid (HA) due to the negatively charged HA adsorption, resulting in the shift of points of zero charge to lower values of pH. The aggregations of nanocomposites were more significant due to the bridging effect of HA. Furthermore, the aggregated particle sizes were larger for RGO-nanocomposites compared to other nanoparticles, due to the bindings of the carboxylic and phenolic functional groups in HA with the oxygen-containing functional groups in the RGO-nanocomposites. The microfiltration (MF) membrane was effective for the nanocomposites separation. In the continuous flow through submerged membrane photoreactor (sMPR) system, backwashing operation could efficiently reduce membrane fouling and recover TiO2, and thus indirectly facilitate the PG removal.