Preparation of Supported Perovskite Catalyst to Purify Membrane Concentrate of Coal Chemical Wastewater in UV-Catalytic Wet Hydrogen Peroxide Oxidation System

Wenwen Zhang, Zhenxue Liu, Pei Chen, Guangzhen Zhou, Zhiying Liu and Yanhua Xu
Additional contact information
Wenwen Zhang: College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, China
Zhenxue Liu: College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, China
Pei Chen: College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, China
Guangzhen Zhou: College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211800, 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, 2021, vol. 18, issue 9, 1-17

Abstract: The effective treatment of membrane concentrate is a major technical challenge faced by the new coal chemical industry. In this study, a supported perovskite catalyst LaCoO 3 /X was prepared by a sol–impregnation two-step method. The feasibility of the supported perovskite catalyst LaCoO 3 /X in the UV-catalytic wet hydrogen peroxide oxidation (UV-CWPO) system for the purification of concentrated liquid of coal chemical wastewater was investigated. The effects of catalyst support, calcination temperature, calcination time, and re-use time on catalytic performance were investigated by batch experiments. The catalysts were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), and X-ray photoelectron spectroscopy (XPS). Experimental results showed that the supported perovskite catalyst LaCoO 3 /CeO 2 prepared using CeO 2 as support, calcination temperature of 800 °C, and calcination time of 8 h had the best catalytic effect. The catalytic performance of the catalyst remained excellent after seven cycles. The best prepared catalyst was used in UV-CWPO of coal chemical wastewater membrane concentrate. The effects of H 2 O 2 dosage, reaction temperature, reaction pressure, and catalyst dosage on UV-CWPO were determined. Under the conditions of H 2 O 2 dosage of 40 mM, reaction temperature of 120 °C, reaction pressure of 0.5 MPa, catalyst dosage of 1 g/L, pH of 3, and reaction time of 60 min, the removal efficiencies of COD, TOC, and UV 254 were 89.7%, 84.6%, and 98.1%, respectively. Under the optimal operating conditions, the oxidized effluent changed from high toxicity to non-toxicity, the BOD 5 /COD increased from 0.02 to 0.412, and the biodegradability of the oxidized effluent was greatly improved. The catalyst has a simple synthesis procedure, excellent catalytic performance, and great potential in the practical application of coal chemical wastewater treatment.

Keywords: membrane concentrate; UV-catalytic wet hydrogen peroxide oxidation; supported perovskite catalyst; biotoxicity testing; biodegradability (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1660-4601/18/9/4906/pdf (application/pdf)
https://www.mdpi.com/1660-4601/18/9/4906/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jijerp:v:18:y:2021:i:9:p:4906-:d:548871

Access Statistics for this article

IJERPH is currently edited by Ms. Jenna Liu

More articles in IJERPH from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().