DEGRADATION OF HUMIC ACID IN WATER BY ULTRAVIOLET PHOTOCATALYSIS OF TiO2/GO COMPOSITE NANOMATERIALS
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摘要: 采用溶胶凝胶法在最优煅烧温度(350℃)下,制备不同石墨烯(GO)负载比例的TiO2/GO复合光催化材料,通过SEM、XRD、Raman、FT-IR、TGA、BET等技术表征并分析材料的表面形貌、晶相结构、官能团与化学键合等特征,进而探究该复合材料在紫外光下对水中腐植酸(HA)的降解性能和机理。结果表明:随着石墨烯(GO)负载比例的增大,TiO2/GO复合催化剂粒径变小,比表面积增大,有层次的形貌空隙有效减小了团聚,提升了光生载流子迁移效率;Raman光谱中1350 cm-1和1600 cm-1的2处特征峰验证GO成功负载,且晶型仍以锐钛矿相为主;3%GO负载量的TiO2/GO光催化性能最优。当TiO2/3%GO投加量为0.5 g/L,水中HA初始浓度为10 mg/L时,在紫外光下催化反应1 h后降解率达到84.7%,其降解速率常数为0.0313 min-1。Abstract: In this paper, TiO2/GO composite photocatalysts were prepared through sol-gel method by using butyl titanate and different loads of graphene oxide as precursors, at the optimal calcination temperature (350℃). The structure and properties of TiO2/GO nanomaterials were characterized by SEM, XRD, Raman, FT-IR, TGA and BET. The degradation characteristic of humic acid (HA) in water by composite materials under UV light were analyzed. The results showed that the particle size of TiO2/GO composite catalyst was decreased, while the specific surface area was increased, the agglomeration effect was reduced and the photocatalytic efficiency was improved, with the increase of GO loading ratio. The two characteristic peaks of 1350 cm-1 and 1600 cm-1 in Raman spectrum indicated that the GO was successfully loaded in TiO2 nanomaterial, and the crystal type was mainly anatase. The composite material with 3%GO loaded performed best. When TiO2/3%GO dosage was 0.5 g/L and the initial HA concentration in water was 10 mg/L, the degradation rate under ultraviolet light reached 84.7% after 1 h of radiation, and the degradation rate constant was 0.0313 min-1.
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Key words:
- TiO2 /
- GO /
- nanomaterial /
- ultraviolet photocatalysis /
- humic acid
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