Oxidation of aniline aerofloat in flotation wastewater by sodium hypochlorite solution.
Aniline aerofloat (dianilinodithiophosphoric acid (C6H5NH)2PSSH) is a widely used phosphorodithioic organic flotation collector that contains aniline groups and dithiophosphate groups. In the present study, sodium hypochlorite solution was used to oxidize aniline aerofloat. The effect of operational parameters and optimum oxidation conditions on aniline aerofloat was studied, and the oxidation pathway of aniline aerofloat was proposed by analyzing its main oxidation intermediates. The results showed that NaOCl concentration had a significant influence on aniline aerofloat oxidation and at 100 mg/L aniline aerofloat, 84.54% was removed under the following optimal conditions: NaOCl concentration = 1.25 g/L, pH = 4, and reaction time = 60 min. The main reaction of aniline aerofloat by NaOCl included N-P bond cleavage, aniline group oxidation, aniline group chlorination, and dithiophosphate group oxidation. The initial reaction was the N-P bond cleavage and the anilines and dithiophosphate was further oxidized to other intermediates by five parallel reaction pathways.
School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China.
Weixiong
W
Lin
School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China.
Jing
J
Tian
School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China.
Jie
J
Ren
School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China.
Pingting
P
Xu
School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China.
Yongkang
Y
Dai
School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China. sysun@gdut.edu.cn.
Shuiyu
S
Sun
Guangdong Weizhong Testing Technology Co., Ltd., Guangzhou, Guangdong, China.
Chun
C
Wu
D000814:Aniline Compounds / Q000737:chemistry*; D010084:Oxidation-Reduction; D012973:Sodium Hypochlorite; D062065:Wastewater / Q000737:chemistry*
D000814:Aniline Compounds; D012973:Sodium Hypochlorite; D062065:Wastewater; C023650:aniline
Aniline aerofloat; Chemical oxidation; Oxidation intermediates; Oxidation pathways; Sodium hypochlorite solution