Removal of triclosan via sorption and redox reactions in the presence of nano-MnO2-biochar composites

IF 3 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Environmental Science and Technology Pub Date : 2024-11-27 DOI:10.1007/s13762-024-06222-2

S-Y. Oh, D-G. Kim

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引用次数: 0

Abstract

To improve the removal of triclosan in groundwater and soil with nano-MnO₂ and biochar, a novel nano-MnO₂-biochar composite is synthesized, and its applicability to the removal of triclosan under anaerobic conditions is examined via batch experiments. Compared to either MnO₂ or biochar alone (84% and 67% of triclosan), the as-fabricated nano-MnO₂-biochar composite exhibits markedly enhanced triclosan removal via sorption and chemical reactions, showing complete removal in 12 h in the presence of 10 g of the synthesized nano-MnO₂-biochar composite in 200 mL of solution. Under the given conditions, the release of chloride in solution, responsible for 34.6% of initial chlorine in triclosan indicates the dechlorination of triclosan and is supported by liquid chromatography-mass spectrometry analysis. The oxidation of Mn³⁺ to Mn⁴⁺ in MnO₂, as confirmed by X-ray photoelectron spectroscopy, along with the formation of Mn²⁺ in solution, demonstrate that redox reactions are involved in the removal of triclosan by the nano-MnO₂-biochar composite. The present results support the applicability of the nano-MnO₂-biochar composite for the removal of triclosan or other organic contaminants in subsurface environments.

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纳米二氧化锰-生物炭复合材料吸附氧化还原去除三氯生的研究

为了提高纳米mno2和生物炭对地下水和土壤中三氯生的去除效果，合成了一种新型纳米mno2 -生物炭复合材料，并通过批量实验考察了其在厌氧条件下去除三氯生的适用性。与单独MnO2或生物炭（84%和67%的三氯生）相比，制备的纳米MnO2-生物炭复合材料通过吸附和化学反应明显增强了三氯生的去除率，在200 mL溶液中加入10 g合成的纳米MnO2-生物炭复合材料，在12 h内完全去除三氯生。在给定条件下，溶液中氯的释放量占三氯生初始氯的34.6%，表明三氯生发生了脱氯反应，液相色谱-质谱分析结果支持这一结果。x射线光电子能谱证实了Mn3+在MnO2中氧化为Mn4+，并在溶液中形成Mn2+，表明纳米MnO2-生物炭复合材料对三氯生的去除涉及氧化还原反应。本研究结果支持纳米二氧化锰-生物炭复合材料在地下环境中去除三氯生或其他有机污染物的适用性。

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来源期刊

International Journal of Environmental Science and Technology 环境科学-环境科学

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.