Preparation and Characterization of Cu-Mn-Ce@γ-Al 2 O 3 to Catalyze Ozonation in Coal Chemical Wastewater-Biotreated Effluent

Yue Teng, Ke Yao, Wenbin Song, Yongjun Sun, Haoliang Liu, Zhiying Liu and Yanhua Xu
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Yue Teng: College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, China
Ke Yao: College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, China
Wenbin Song: College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, China
Yongjun Sun: College of Urban Construction, Nanjing Tech University, Nanjing 211800, China
Haoliang Liu: NJTECH Environment Technology Co., Ltd., Nanjing 210000, China
Zhiying Liu: College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, China
Yanhua Xu: College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, China

IJERPH, 2019, vol. 16, issue 8, 1-22

Abstract: Cu-Mn-Ce@γ-Al 2 O 3 was prepared by incipient wetness impregnation and used to catalyze ozonation in a coal chemical wastewater-biotreated effluent. The preparation factors that considerably affected the catalytic performance of Cu-Mn-Ce@γ-Al 2 O 3 , specifically metal oxide loading percentage, calcination temperature, and calcination time, were examined. The catalyst was characterized by scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction, and Brunauer-Emmett-Teller analysis. The optimal catalytic ozonation operating parameters, such as ozone dosage, catalyst dosage, pH, and reaction time, were also investigated. Results showed that an optimized catalyst consisted of 17.0% CuO, 3.0% MnO 2 , and 2.0% CeO 2 (wt.%). The optimal calcination temperature and calcination time were 600 °C and 5 h. The optimal catalytic ozonation operating parameters, including ozone dosage, catalyst dosage, pH, and reaction time, were 7, 80.0 mg/L, 20.0 mg/L, 7 and 50 min, respectively. The COD removal of biotreated effluent increased to 61% under these optimal operating conditions. Meanwhile, ozonation alone resulted in only 20% removal. This work proposes the use of easily available Cu-Mn-Ce@γ-Al 2 O 3 catalyst and might drive the advancement of catalytic ozonation for chemical wastewater purification.

Keywords: catalyst; catalytic ozonation; coal chemical wastewater; advanced treatment (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
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