β-In2S3的水热合成及合成条件对其光催化降解土霉素的影响
Preparation of β-In2S3 by hydrothermal process and influence of synthesis conditions on the photocatalytic degradation of oxytetracycline
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摘要: 利用水合硝酸铟和硫代乙酰胺为原料，采用温和水热法一步合成了In2S3.以土霉素为目标污染物，考察了反应物物质的量之比、溶剂体积、反应温度、反应时间等合成条件对最终产物光催化性能的影响，以TOC去除率为评价指标，考察光催化反应后土霉素的矿化程度.结果表明，在In与S的物质的量之为5∶12，溶剂水的体积为80 mL，水热反应的温度为120 ℃，水热反应的时间为12 h时可制备出单一立方相的β-In2S3晶体，并在400—600 nm范围内对可见光有很强的吸收；在室外不同太阳光强照射下，当 In2S3投加量为2.00 g·L-1时，在240 min内对30 mg·L-1的土霉素溶液的去除率达到98%以上，TOC去除率达到69.5%.Abstract: β-In2S3 nanomaterials were prepared by reacting In(NO3)3 with thioacetamide through a facile one-step hydrothermal process. The effects of the synthesis conditions such as the molar ratio of reaction precursors, the volume of solvent water, hydrothermal temperature and hydrothermal time on the photocatalytic activity of In2S3 were investigated using oxytetracycline as the target compound,and the TOC removal efficiency was used as the evaluation index to investigate the degree of mineralization of oxytetracycline after photocatalytic reaction. The results indicated that when the molar ratio was In∶S=5∶2, volume of solvent was 80 mL, hydrothermal temperature was 120 ℃ and hydrothermal time was 12 h, a single cubic crystal of β-In2S3 was successfully synthesized, and excellent visible-light response was obtained in the wavelength range 400—600 nm. Meanwhile, the degradation efficiency of oxytetracycline exceeded 98% and TOC removal efficiency reached 69.5%. after 240 min under solar light irradiation in the presence of 2.00 g·L-1 catalyst and 30 mg·L-1 initial concentration of oxytetracycline which indicated that In2S3 had high photocatalytic activity.
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