Fe/Ti-MIL-NH<sub>2</sub>吸附-光催化降解NDPhA

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Abstract A composite adsorption-photocatalyst, Fe/Ti-MIL-NH₂, was synthesized via the hydrothermal method and utilized to degrade NDPhA. The Fe/Ti-MIL-NH₂ with Fe-Ti molar ratio of 3:1 could degrade more than 84.4% of NDPhA under various conditions, and 95.1% under adding 10 mmol/L HCO₃^-. Compared to Fe-MIL-NH₂, the excellent performance of Fe/Ti-MIL-NH₂ (3:1) was attributed to the in situ formation of intimate heterojunctions, which increased the specific surface area (310.2m²/g), accelerated the separation of photogenerated cavity pairs, and inhibited their complexation. Both surface adsorption and distribution existed during the adsorption of NDPhA on Fe/Ti-MIL-NH₂ as observed from kinetic and adsorption isotherm fitting. The combination of radicals (^·O₂^-, ^·OH) and non-radical (h⁺, Fe[IV]=O) in the Fe/Ti-MIL-NH₂ photolytic system was responsible for NDPhA degradation. Diphenylamine and 2-Nitrodiphenylamine and/or 4-nitrodiphenylamine were identified as the main intermediates during NDPhA degradation, and the pathways were speculated based on these intermediates. In addition, Fe/Ti-MIL-NH₂(3:1) could completely remove NDPhA at concentrations <0.1mg/L in source water of water treatment plant and maintain an NDPhA removal efficiency of 83% after 5times of use, indicating the high stability of this material.

Key words： MOF NDPhA adsorption photocatalysis mechanism

Received: 09 October 2021

PACS:

X703.5

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	XIE Ya-wei
	HUANG Jing-jie
	JIANG Yi-heng
	LIU Hong-yuan

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XIE Ya-wei,HUANG Jing-jie,JIANG Yi-heng等. Adsorption-Photocatalysis for the Removal of NDPhA by Fe/Ti-Mil-NH₂[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(4): 1652-1662.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I4/1652

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