High-efficiency treatment of electroless nickel plating effluent using core-shell MnFe 2 O 4 -C@Al 2 O 3 combined with ozonation: Performance and mechanism

Heterogeneous catalytic ozonation (HCO) has been widely applied for the treatment of wastewater. In order to maintain the structural stability and surface catalytic activity of heterogeneous catalysts during the HCO treatment of electroless nickel plating effluent (ENPE), a MnFe O -C@Al O catalyst w...

Full description

Saved in:
Bibliographic Details
Published in:Journal of hazardous materials 2022-07, Vol.433, p.128768
Main Authors: Guan, Zhijie, Guo, Yanping, Mo, Zhihua, Chen, Shaojin, Liang, Jialin, Liao, Xiaojian, Zhang, Yumin, Huang, Zhenhua, Song, Weifeng, Xu, Yanbin, Ou, Xuelian, Sun, Shuiyu
Format: Article
Language:English
Subjects:
Catalysis
Nickel
Ozone - chemistry
Reactive Oxygen Species
Waste Water - chemistry
Water Pollutants, Chemical - chemistry
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Heterogeneous catalytic ozonation (HCO) has been widely applied for the treatment of wastewater. In order to maintain the structural stability and surface catalytic activity of heterogeneous catalysts during the HCO treatment of electroless nickel plating effluent (ENPE), a MnFe O -C@Al O catalyst with a core-shell structure was synthesized. MnFe O -C@Al O was characterized and applied in the removal of total nickel (T ) and organic contaminants from actual ENPE, using a coupled system of HCO combined with a magnetic dithiocarbamate chelating resin (MnFe O -C@Al O /O -MDCR). Results show that embedding Al O with C and MnFe O significantly increased the T removal efficiency (99.3%), enhanced the O -utilization efficiency and improved the generation of reactive oxygen species (ROS). The reaction rate (k = 0.7641 min ) and O -utilization efficiency established for T removal (ΔT /ΔO =0.221) by the MnFe O -C@Al O /O -MDCR system, were 220% and 140% higher than the Al O /O -MDCR system, respectively. Catalytic mechanism analysis demonstrated that surface hydroxyl groups, oxygen vacancy, metals, the carbon surface and its functional groups, can all potentially serve as catalytic active sites, with O and •OH considered to the predominant ROS. Overall, these findings verify that the synthesized MnFe O -C@Al O catalyst possesses excellent catalytic capabilities and outstanding structural stability, making it suitable for practical application in the treatment of wastewater effluent.
ISSN:1873-3336