胶体 CdS 敏化纳米 ZnO/壳聚糖水凝胶在太阳光照射下快速高效光催化去除刚果红。
Colloidal CdS sensitized nano-ZnO/chitosan hydrogel with fast and efficient photocatalytic removal of congo red under solar light irradiation.
机构信息
Department of Environmental Engineering, Taizhou University, Taizhou 318000, Zhejiang, China; Institute of Biomass Resource, Taizhou University, Taizhou 318000, Zhejiang, China; Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Taizhou, Zhejiang 318000, China.
Department of Environmental Engineering, Taizhou University, Taizhou 318000, Zhejiang, China; Institute of Biomass Resource, Taizhou University, Taizhou 318000, Zhejiang, China; Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Taizhou, Zhejiang 318000, China.
出版信息
Int J Biol Macromol. 2021 Mar 31;174:52-60. doi: 10.1016/j.ijbiomac.2021.01.077. Epub 2021 Jan 15.
Colloidal CdS sensitized nano-ZnO/chitosan (CdS@n-ZnO/CS) hydrogel was prepared and characterized extensively by XRD, SEM-EDS, TEM, UV-Vis DRS, FT-IR and TGA. The photocatalytic activity of CdS@n-ZnO/CS was evaluated with the photodegradation of congo red (CR) as an organic pollutant under solar light irradiation. The influences of initial dye concentration, catalyst dosage, recycling runs, and radical scavenger on decolorization of CR by CdS@n-ZnO/CS were investigated. 95% of CR was removed in just 1 min for 5.0 mg L and 94.34% of CR was removed in 30 min for 100 mg L. CdS@n-ZnO/CS exhibited an excellent and ultra-fast performance toward CR removal under solar light due to the synergistic effect of adsorption by chitosan and photocatalysis by ZnO and CdS in CdS@n-ZnO/CS hydrogel. Radical trapping control experiments indicated that h and O played the major role for CR decolorization. The high performance of CdS@n-ZnO/CS hydrogel was also demonstrated under natural solar light irradiation, suggesting that CdS@n-ZnO/CS hydrogel could be used in practical wastewater treatment.
胶体 CdS 敏化纳米 ZnO/壳聚糖 (CdS@n-ZnO/CS) 水凝胶通过 XRD、SEM-EDS、TEM、UV-Vis DRS、FT-IR 和 TGA 进行了广泛的表征。CdS@n-ZnO/CS 的光催化活性通过在太阳光照射下刚果红 (CR) 的光降解来评估。考察了初始染料浓度、催化剂用量、循环使用次数和自由基清除剂对 CdS@n-ZnO/CS 对 CR 脱色的影响。在 5.0mg/L 时，仅需 1 分钟即可去除 95%的 CR，在 100mg/L 时，30 分钟即可去除 94.34%的 CR。由于壳聚糖的吸附作用和 ZnO 和 CdS 在 CdS@n-ZnO/CS 水凝胶中的光催化作用的协同效应，CdS@n-ZnO/CS 对 CR 的去除表现出优异的超快性能。自由基捕获控制实验表明，h 和 O 对 CR 的脱色起主要作用。CdS@n-ZnO/CS 水凝胶在自然太阳光照射下也表现出了较高的性能，表明 CdS@n-ZnO/CS 水凝胶可用于实际废水处理。
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