Strongly enhanced Fenton degradation of organic pollutants by cysteine: An aliphatic amino acid accelerator outweighs hydroquinone analogues.
Quinone-hydroquinone analogues have been proven to be efficient promoters of Fenton reactions by accelerating the Fe(III)/Fe(II) redox cycle along with self-destruction. However, so far there is little information on non-quinone-hydroquinone cocatalyst for Fenton reactions. This study found that cysteine, a common aliphatic amino acid, can strongly enhance Fenton degradation of organic pollutants by accelerating Fe(III)/Fe(II) redox cycle, as quinone-hydroquinone analogues do. Further, cysteine is superior to quinone-hydroquinone analogues in catalytic activity, H2O2utilization and atmospheric limits. The cocatalysis mechanism based on the cycle of cysteine/cystine was proposed.
School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
Tuo
T
Li
Beijing Mass Spectrum Center, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Zhenwen
Z
Zhao
School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
Quan
Q
Wang
School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
Pengfei
P
Xie
School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: majia@ucas.ac.cn.
Jiahai
J
Ma
D000596:Amino Acids; D003545:Cysteine; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006873:Hydroquinones; D007501:Iron / Q000737:chemistry; D010084:Oxidation-Reduction
D000596:Amino Acids; D006873:Hydroquinones; D006861:Hydrogen Peroxide; D007501:Iron; D003545:Cysteine
Cysteine; Fenton; Iron redox cycle; Quinone–hydroquinone