NiO/La-KTaO3复合光催化剂紫外降解合成浮选废水中异戊基黄药的性能及机理

IF 3 4区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
X. Xu, L. Zhu, C. Chen, C. Luo, Z. Jin, Z. Sun, Z.T Fu
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引用次数: 0

摘要

采用直接水热法制备了NiO/La-KTaO3异质结光催化剂。复合材料的光催化效率是通过它们在紫外光存在下破坏异戊基黄药的能力来评估的,模拟了浮选废水中的条件。结果表明,与KTaO3相比,复合催化剂的光催化活性显著提高。采用40 mg NiO/K1−xLaxTaO3 (x = 0.04)光催化剂在pH = 3条件下进行光催化反应。用浓度为20 mg/L的异戊基黄药合成废水50 mL进行反应。30 min后的降解率为87.28%。氧化镍(NiO)的加入和La在K晶格位置的引入被认为促进了电荷分离、迁移和产生额外的活性位点,从而增强了催化效果。自由基捕获试验结果表明,·O2−(超氧离子)是光催化过程中的主要活性物质,发挥了重要作用。采用不同的分析和测试方法,确定了异戊基黄药的光降解过程。介绍了一种直接、有效的生态降解黄药浮选废水的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Performance and mechanism of NiO/La-KTaO3 composite photocatalysts for UV degradation of isoamyl xanthate in synthetic flotation wastewater

The study employed a direct hydrothermal method to synthesize NiO/La-KTaO3 heterojunction photocatalysts. The photocatalytic efficiency of the composites was assessed by their ability to destroy isoamyl xanthate in the presence of Ultraviolet light, mimicking the conditions seen in flotation wastewater. The results showed a significantly greater photocatalytic activity when comparing the composite catalyst to KTaO3. A photocatalytic reaction was performed utilizing a 40 mg NiO/K1−xLaxTaO3 (x = 0.04) photocatalyst at pH = 3. The reaction was carried out using 50 mL of isoamyl xanthate synthesis wastewater, which had a concentration of 20 mg/L. The degradation rate achieved after 30 min was 87.28%. The addition of nickel oxide (NiO) and the introduction of La into the K lattice position were thought to facilitate charge separation, migration, and the generation of additional active sites, hence augmenting the catalytic impact. The findings from radical capture tests indicated that the ·O2− (superoxide ion) served as the principal active species in the photocatalytic process, playing a substantial role. The process of photodegradation of isoamyl xanthate was determined through the utilization of different analytical and testing methods. This work introduces a direct and effective approach for the eco-friendly decomposition of xanthate flotation wastewater.

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来源期刊
CiteScore
5.60
自引率
6.50%
发文量
806
审稿时长
10.8 months
期刊介绍: International Journal of Environmental Science and Technology (IJEST) is an international scholarly refereed research journal which aims to promote the theory and practice of environmental science and technology, innovation, engineering and management. A broad outline of the journal''s scope includes: peer reviewed original research articles, case and technical reports, reviews and analyses papers, short communications and notes to the editor, in interdisciplinary information on the practice and status of research in environmental science and technology, both natural and man made. The main aspects of research areas include, but are not exclusive to; environmental chemistry and biology, environments pollution control and abatement technology, transport and fate of pollutants in the environment, concentrations and dispersion of wastes in air, water, and soil, point and non-point sources pollution, heavy metals and organic compounds in the environment, atmospheric pollutants and trace gases, solid and hazardous waste management; soil biodegradation and bioremediation of contaminated sites; environmental impact assessment, industrial ecology, ecological and human risk assessment; improved energy management and auditing efficiency and environmental standards and criteria.
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