High-Efficiency Catalytic Ozonation Degradation of Ni Complex Wastewater Using Mn-N Codoped Active Carbon Catalyst

Caiyi Jiang; Dongzheng Wang; Min Li; Li Yang; Xingyong Liu; Guo Yang; Bo Xing; Yi Wang; Fuping Zhang

doi:10.1021/acs.langmuir.4c03502

High-Efficiency Catalytic Ozonation Degradation of Ni Complex Wastewater Using Mn-N Codoped Active Carbon Catalyst

Langmuir. 2025 Jan 3. doi: 10.1021/acs.langmuir.4c03502. Online ahead of print.

Authors

Caiyi Jiang^{1

2

3

4}, Dongzheng Wang^{2

4}, Min Li⁵, Li Yang^{1

3}, Xingyong Liu^{2

6

4}, Guo Yang^{2

4}, Bo Xing^{2

4}, Yi Wang^{2

4}, Fuping Zhang^{2

4}

Affiliations

¹ State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China.
² College of Chemical Engineering, Sichuan University of Science and Engineering, Zigong, Sichuan 643000, China.
³ Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
⁴ National Engineering Laboratory of Circular Economy, Sichuan University of Science and Engineering, Zigong, Sichuan 643000, China.
⁵ College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China.
⁶ Meishan Vocational and Technical College, Meishan, Sichuan 620010, China.

PMID: 39754292
DOI: 10.1021/acs.langmuir.4c03502

Abstract

With the rapid development of electroless nickel (Ni) plating industry, a large amount of Ni complex wastewater is inevitably produced, which is a serious threat to the ecological environment. Herein, a novel Mn-N codoped active carbon (Mn-N@AC) catalyst with high catalytic ozonation ability was synthesized by the impregnation precipitation method and was characterized by BET, XRD, Raman, SEM, FTIR, and TPR. Meanwhile, Mn-N@AC showed excellent catalytic ozonation ability, stability, and applicability. When Ni-EDTA (TOC = 400, Ni = 58.05 mg/L) was used as simulated wastewater, the removal efficiency of TOC and total Ni reached 97.8 and 92.7%, respectively, and after three cycles, the TOC removal efficiency was still up to 93.6%. When Ni-EDTA wastewater was replaced with Ni-citrate, Ni-tartaric, and Ni-malate, the TOC removal efficiency remained above 93%. In addition, mechanistic insights by quenching experiments and EPR verified the high removal efficiency of TOC mainly attributed to indirect oxidation of ^·OH and ^·O₂^-, and the potential mechanism was proposed. The work provides insights into the deep removal of Ni complex wastewater by catalytic ozonation with low cost and high efficiency.