PSF多相UV-Fenton体系原儿茶酸与龙胆酸的增效对比

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Abstract The capability of protocatechuic acid and gentisic acid in enhancing the degradation of orange Ⅱ in the heterogeneous UV-Fenton system with PSF as catalyst was compared, and the relationship among iron ion conversion, H₂O₂ decomposition and·OH generation in the two systems was analyzed. The enhancement mechanisms of the two reagents in heterogeneous UV-Fenton system with PSF as catalyst was further discussed. The experimental results showed that both protocatechuic acid and gentisic acid could effectively promote the formation and release of Fe²⁺, thereby increasing ·OH concentration and promoting orange Ⅱ degradation. Compared with protocatechuic acid, gentisic acid showed better capacity for reducing PSF. As a result, higher ·OH concentration and faster orange Ⅱ degradation rate were achieved in the gentisic acid system. With the addition of 0.2mmol/L reagent, the "first" kinetic rate constant for orange Ⅱ decolorization increased from 0.11 to 1.68min^-1 for the protocatechuic acid system, and to 2.48min^-1 for the gentisic acid system, which increased by 14.27 and 21.55 times, respectively. During consecutive runs, both the two acids could enhance orange Ⅱ degradation. After treatment, the readsorption of Fe³⁺ by PSF made the total iron ion concentration in solution lower than 5mg/L, avoiding the loss of iron ions and the secondary pollution. Our results indicated that protocatechuic acid and gentisic acid were both highly effective enhancement reagents to heterogeneous UV-Fenton system with PSF as catalyst.

Key words： heterogeneous UV-Fenton system PSF protocatechuic acid gentisic acid orange Ⅱ

Received: 24 August 2020

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X703

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	Articles by authors
	SU Xiao-xuan
	XU Guo-peng
	LI Xian-zhong
	LIU Li-zhang
	CHEN Jian-xin

Cite this article:

SU Xiao-xuan,XU Guo-peng,LI Xian-zhong等. Comparison of the enhanced effect of protocatechuic acid and gentisic acid on the heterogeneous UV-Fenton system with Poly-Silicate-Ferric(PSF) as catalyst[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(4): 1624-1633.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I4/1624

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