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Performance of magnetic activated carbon composite as peroxymonosulfate activator and regenerable adsorbent via sulfate radical-mediated oxidation processes.
J Hazard Mater. 2015 Mar 02; 284:1-9.JH

Abstract

Magnetic activated carbon composite (CuFe2O4/AC, MACC) was prepared by a co-precipitation-calcination method. The MACC consisted of porous micro-particle morphology with homogeneously distributed CuFe2O4 and possessed high magnetic saturation moment (8.1 emu g(-1)). The performance of MACC was evaluated as catalyst and regenerable adsorbent via peroxymonosulfate (PMS, Oxone(®)) activation for methylene blue (MB) removal. Optimum CuFe2O4/AC w/w ratio was 1:1.5 giving excellent performance and can be reused for at least 3 cycles. The presence of common inorganic ions, namely Cl(-) and NO3(-) did not exert significant influence on MB degradation but humic acid decreased the MB degradation rate. As a regenerable adsorbent, negligible difference in regeneration efficiency was observed when a higher Oxone(®) dosage was employed but a better efficiency was obtained at a lower MACC loading. The factors hindering complete MACC regeneration are MB adsorption irreversibility and AC surface modification by PMS making it less favorable for subsequent MB adsorption. With an additional mild heat treatment (150 °C) after regeneration, 82% of the active sites were successfully regenerated. A kinetic model incorporating simultaneous first-order desorption, second-order adsorption and pseudo-first order degradation processes was numerically-solved to describe the rate of regeneration. The regeneration rate increased linearly with increasing Oxone(®):MACC ratio. The MACC could potentially serve as a catalyst for PMS activation and regenerable adsorbent.

Authors+Show Affiliations

Nanyang Environment and Water Research Institute (NEWRI), Interdisciplinary Graduate School, Nanyang Technological University, 1 Cleantech Loop, CleanTech One Singapore, 637141, Singapore; Division of Environmental and Water Resources Engineering, School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.Nanyang Environment and Water Research Institute (NEWRI), Interdisciplinary Graduate School, Nanyang Technological University, 1 Cleantech Loop, CleanTech One Singapore, 637141, Singapore; School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.Nanyang Environment and Water Research Institute (NEWRI), Interdisciplinary Graduate School, Nanyang Technological University, 1 Cleantech Loop, CleanTech One Singapore, 637141, Singapore; School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.Nanyang Environment and Water Research Institute (NEWRI), Interdisciplinary Graduate School, Nanyang Technological University, 1 Cleantech Loop, CleanTech One Singapore, 637141, Singapore; Division of Environmental and Water Resources Engineering, School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore. Electronic address: cttlim@ntu.edu.sg.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25463211

Citation

Oh, Wen-Da, et al. "Performance of Magnetic Activated Carbon Composite as Peroxymonosulfate Activator and Regenerable Adsorbent Via Sulfate Radical-mediated Oxidation Processes." Journal of Hazardous Materials, vol. 284, 2015, pp. 1-9.
Oh WD, Lua SK, Dong Z, et al. Performance of magnetic activated carbon composite as peroxymonosulfate activator and regenerable adsorbent via sulfate radical-mediated oxidation processes. J Hazard Mater. 2015;284:1-9.
Oh, W. D., Lua, S. K., Dong, Z., & Lim, T. T. (2015). Performance of magnetic activated carbon composite as peroxymonosulfate activator and regenerable adsorbent via sulfate radical-mediated oxidation processes. Journal of Hazardous Materials, 284, 1-9. https://doi.org/10.1016/j.jhazmat.2014.10.042
Oh WD, et al. Performance of Magnetic Activated Carbon Composite as Peroxymonosulfate Activator and Regenerable Adsorbent Via Sulfate Radical-mediated Oxidation Processes. J Hazard Mater. 2015 Mar 2;284:1-9. PubMed PMID: 25463211.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Performance of magnetic activated carbon composite as peroxymonosulfate activator and regenerable adsorbent via sulfate radical-mediated oxidation processes. AU - Oh,Wen-Da, AU - Lua,Shun-Kuang, AU - Dong,Zhili, AU - Lim,Teik-Thye, Y1 - 2014/10/31/ PY - 2014/08/21/received PY - 2014/10/22/revised PY - 2014/10/29/accepted PY - 2014/12/3/entrez PY - 2014/12/3/pubmed PY - 2015/8/26/medline KW - Activated carbon regeneration KW - Magnetic activated carbon composite KW - Peroxymonosulfate KW - Sulfate radical KW - Surface chemistry SP - 1 EP - 9 JF - Journal of hazardous materials JO - J Hazard Mater VL - 284 N2 - Magnetic activated carbon composite (CuFe2O4/AC, MACC) was prepared by a co-precipitation-calcination method. The MACC consisted of porous micro-particle morphology with homogeneously distributed CuFe2O4 and possessed high magnetic saturation moment (8.1 emu g(-1)). The performance of MACC was evaluated as catalyst and regenerable adsorbent via peroxymonosulfate (PMS, Oxone(®)) activation for methylene blue (MB) removal. Optimum CuFe2O4/AC w/w ratio was 1:1.5 giving excellent performance and can be reused for at least 3 cycles. The presence of common inorganic ions, namely Cl(-) and NO3(-) did not exert significant influence on MB degradation but humic acid decreased the MB degradation rate. As a regenerable adsorbent, negligible difference in regeneration efficiency was observed when a higher Oxone(®) dosage was employed but a better efficiency was obtained at a lower MACC loading. The factors hindering complete MACC regeneration are MB adsorption irreversibility and AC surface modification by PMS making it less favorable for subsequent MB adsorption. With an additional mild heat treatment (150 °C) after regeneration, 82% of the active sites were successfully regenerated. A kinetic model incorporating simultaneous first-order desorption, second-order adsorption and pseudo-first order degradation processes was numerically-solved to describe the rate of regeneration. The regeneration rate increased linearly with increasing Oxone(®):MACC ratio. The MACC could potentially serve as a catalyst for PMS activation and regenerable adsorbent. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/25463211/Performance_of_magnetic_activated_carbon_composite_as_peroxymonosulfate_activator_and_regenerable_adsorbent_via_sulfate_radical_mediated_oxidation_processes_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(14)00883-8 DB - PRIME DP - Unbound Medicine ER -