Efficient catalytic degradation of trichloroethylene in persulfate system by Ca-Fe2O3 and Cu-Fe2O3 nanoparticles: Mechanistic insights. Issue 2 (April 2022)

• Record Type: Journal Article
• Authors: Idrees, Ayesha; Shan, Ali; Zaman, Waqas Qamar; Mohsin, Ali; Abbas, Zain; Shahzad, Tanvir; Shakeel, Atif; Lyu, Shuguang
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 2(2022)
• Publication Date: 2022-04
• Subjects: M-metal doped Fe2O3 -- Trichloroethylene -- Oxygen vacancies -- Persulfate -- Groundwater remediation; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.107196
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: M-metal (Ca and Cu) doped Ca-Fe2 O3 and Cu-Fe2 O3 catalysts were synthesized using solvothermal method. The Ca-Fe2 O3 and Cu-Fe2 O3 catalysts were characterized by XRD, Raman spectroscopy, SEM, TEM and XPS spectroscopy. The catalytic performance of 6%Ca-Fe2 O3 and 5%Cu-Fe2 O3 catalysts for trichloroethylene (TCE) removal were improved by M-metal doping leading to TCE removal at 99.8% in 1 h, which were three folds greater than by simple a- Fe2 O3 in the presence of persulfate (PS). Ca and Cu doping formed defective structure and created more oxygen vacancies thereby generating abundant active species during PS activation process. Further, the influence of catalysts' dosage, oxidant dosage, solution pH, inorganic anions, and dissolved oxygen were evaluated. Complete removal of TCE was also obtained at weak alkaline pH condition. The greater specific surface area and the improved electrical conductivity was attributed to the huge generation of O2 – and 1 O2 species which played major part in TCE removal. Scavenging tests and ESR spectroscopy confirmed the dominant role of O2 – and 1 O2 in TCE degradation. The stability and viability of 6%Ca-Fe2 O3 and 5%Cu-Fe2 O3 catalysts were evaluated by repetition tests and in the presence of surfactants, TCE removal in real water matrix, and in the degradation of multi-pollutants. Graphical Abstract: ga1 Highlights: Ca-Fe2 O3 and Cu-Fe2 O3 catalysts with abundant oxygen vacancies were prepared by solvothermal method. 6%Ca-Fe2 O3 and 5%Cu-Fe2 O3 catalysts degraded TCE better than a -Fe2 O3 . 1 O2 species played major role in TCE removal process. Complete removal of TCE was obtained even at alkaline pH in both systems. PS/6%Ca-Fe2 O3 and PS/5%Cu-Fe2 O3 systems exhibited remarkable TCE removal in real water matrix.