首页|染料改性二氧化钛/石墨烯的制备及其在MB光催化降解中的应用

染料改性二氧化钛/石墨烯的制备及其在MB光催化降解中的应用

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为了改进石墨烯基粉末光催化剂水分散性差的问题,采用水热法制备了二氧化钛/石墨烯(TG),再以含有多个亲水基团的染料对TG共价接枝,制备出三元复合光催化材料;考察了染料和TG比例及不同染料结构对光催化剂带隙、水分散性的影响以及不同光催化剂对亚甲基蓝(MB)模拟污水的降解性能.结果表明:复合材料DTG系列带隙相对TG均变窄,对光响应范围延伸至可见光区;复合材料D2.70 TG水分散性良好,静置7 d后无明显沉淀聚集;D2.70 TG在可见光照射下2 h,其对于模拟污水中MB的去除率达到99%以上,经过5次光照循环后,去除率仍可达95%以上.
Preparation of Dye-modified Titanium Dioxide/graphene and Its Application in Photocatalytic Degradation of MB
To improve the water dispersibility of graphene based powder photocatalyst,titanium dioxide/graphene (TG) was first prepared using a hydrothermal method in this paper,and then the ternary composite photocatalytic materials were prepared by covalently grafting TG with dyes containing hydrophilic groups.The bandgap,water dis-persibility,and photocatalytic degradation performance of methylene blue (MB) simulated wastewater of the photo-catalysts were mainly investigated.The results showed that the bandgaps of the DTG series of composites were nar-rowed compared to that of TG,extending the light response range to the visible light region.The composite D2.70 TG exhibited good water dispersibility,and no significant precipitation aggregation occurred after 7 days of testing.The removal rate of MB in the simulated wastewater by D2.70 TG under the irradiation of visible light for 2 h was over 99%,and the removal rate remained above 95% after 5 cycles of experimentation.

grapheneTiO2photocatalystdyewater dispersibilitydiazonium

李科宇、梁苗青、聂锦梅、关芳兰、鲍利红

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北京服装学院材料设计与工程学院,北京100029

北京市服装材料研发与评价重点实验室,北京100029

石墨烯 TiO2 光催化 染料 水分散 重氮化

国家自然科学基金面上项目

52173001

2024

北京服装学院学报(自然科学版)
北京服装学院

北京服装学院学报(自然科学版)

影响因子:0.17
ISSN:1001-0564
年,卷(期):2024.44(2)
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