Degradation of 4-chlorophenol using catalyzed peroxymonosulfate with nano-MnO2/UV irradiation: Toxicity assessment and evaluation for industrial wastewater treatment

被引:134
作者
Eslami, Akbar [1 ,2 ]
Hashemi, Marjan [1 ]
Ghanbari, Farshid [3 ]
机构
[1] Shahid Beheshti Univ Med Sci, Environm & Occupat Hazards Control Res Ctr, Tehran, Iran
[2] Shahid Beheshti Univ Med Sci, Dept Environm Hlth Engn, Tehran, Iran
[3] Abadan Sch Med Sci, Dept Environm Hlth Engn, Abadan, Iran
关键词
Chlorophenol; Sulfate radical; Heterogeneous catalyst; Toxicity; UV-LEDs; ADVANCED OXIDATION PROCESSES; PHENOL DEGRADATION; HYDROTHERMAL SYNTHESIS; REMOVAL; KINETICS; ACTIVATION; MECHANISM; RADICALS; PERFORMANCE; PERSULFATE;
D O I
10.1016/j.jclepro.2018.05.137
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
4-chlorophenol (4-CP) is one of the most important phenolic compounds in various industries. Different technologies have been applied for 4-CP degradation in aquatic environment. Current study is focused on 4-CP degradation by the combination of UV and MnO2 for peroxymonosulfate (PMS) activation to degrade 4-CP. MnO2 nanoparticles were synthesized and characterized by X-ray powder diffraction, field emission scanning electron microscope, energy-dispersive X-ray spectroscopy and Brunauer Emmett Teller (BET). The effects of operational parameters were evaluated and their results indicated the highest performance in pH = 4.0, 1 mM PMS and 0.25 g/L MnO2. Complete degradation of 4-CP during 30 min was a representative of high performance of UV/MnO2/PMS. Kinetic study showed that the co-activation of PMS by MnO2 and UV had a synergistic effect on 4-CP degradation. MnO2 could keep its performance at least 4th cycle while Mn leaching was negligible. Bicarbonate and hydrogen phosphate ions suppressed the performance of the process in degradation of 4-CP whereas no change was observed in the presence of chloride ions. Quenching experiments showed that hydroxyl radical was dominant radical for 4-CP degradation. The results of toxicity and biodegradability tests indicated that treated sample by UV/MnO2/PMS process was relatively non-toxic and easy biodegradable. The function of UV/MnO2/PMS system for treatment of real industrial wastewaters (pharmaceutical and petrochemical wastewaters) was tested. Finally, it was concluded that hybrid activation of PMS can be a new perspective for PMS-based processes to treat industrial wastewater. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1389 / 1397
页数:9
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