TiO<sub>2</sub>纳米管对水源水中MC-LR的光催化降解

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Abstract

In this work, TiO₂ nanotubes was fabricated using anodization method with oxalic acid and NH₄F solution. TiO₂ nanotubes were used to photocatalytic degradation of microsytins-LR. The results showed that the morphology was the most highly ordered under the optimum anodic voltage of 20V, electrolyte composition of 1/12mol/L H₂C₂O₄·2H₂O+0.5wt%NH₄F and anodization time of 1~2h. The pore size of nanotubes was around 50nm, and the length was 250~600nm. After annealing at the temperature of 500~600℃, TiO₂ nanotubes showed a high photocatalytic ability for MC-LR under pH 3.5and 8. The photocatalytic reactions of MC-LR fit well with the pseudo-first order kinetics. We infer the possible degradation pathways of MC-LR involve not only the attack by hydroxyl radicals for the conjugated double bond and methoxy group in the Adda chain, as well as the conjugated system in the Mdha amino acid, but also the hydrolysis of peptide bonds.

Key words： TiO₂ nanotubes photocatalysis microcystins mechanism of degradation

Received: 01 December 2017

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	Articles by authors
	DENG Yi-rong
	ZHAO Lu
	SU Ya-ling
	ZHONG Yin
	PENG Ping-an
	XIAO Rong-bo

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DENG Yi-rong,ZHAO Lu,SU Ya-ling等. Photocatalytic degradation of microcystins-LR in source water using TiO₂ nanotubes[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(7): 2498-2504.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I7/2498

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