Journal ArticleDOI
Degradation and mineralization of phenol in aqueous medium by heterogeneous monopersulfate activation on nanostructured cobalt based-perovskite catalysts ACoO(3) (A = La, Ba, Sr and Ce): Characterization, kinetics and mechanism study
Samia Ben Hammouda,Feiping Zhao,Zahra Safaei,Varsha Srivastava,Deepika Lakshmi Ramasamy,Sidra Iftekhar,Simo Kalliola,Mika Sillanpää,Mika Sillanpää +8 more
TLDR
In this paper, the authors reported the heterogeneous catalytic degradation and mineralization of phenol in aqueous solution by means of potassium monopersulfate (PMS or Oxone) process mediated by cobalt perovskite-based catalysts (P-Co).Abstract:
This study reports the heterogeneous catalytic degradation and mineralization of phenol in aqueous solution by means of potassium monopersulfate (PMS or Oxone) process mediated by cobalt perovskite-based catalysts (P-Co). Four nanostructured perovskites oxides with formula ACoO3 (A = Ba, Ce, La, Sr) were synthesized as heterogeneous catalysts by the citrate sol gel method and characterized by means of nitrogen isotherm adsorption (BET), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectrometry (EDX), x-ray photoelectron spectroscopy (XPS), X-ray Diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared (FT-IR) techniques. All the examined samples had perovskite structure. The influences of PMS dosage, catalyst loading, initial target compound concentration and solution pH on the removal efficiency were studied. The activity showed an order of SrCoO3 > LaCoO3 > BaCoO3 > CeCoO3. LaCoO3 and SrCoO3 catalysts exhibit the better performance in terms of reaction rate and stability for the phenol degradation and mineralization by advanced oxidation technology based on sulfate radicals. Catalyst stability was assessed by means of consecutive reuse cycles. No significant loss of activity was noticed after five consecutive cycles. The role of reactive oxygen species produced in the system, mainly SO4 − and OH, in the overall oxidation of phenol was determined by using suitable scavenger compounds. Under optimal conditions (10−4 M PMS, natural pH, 0.3 gL−1 catalyst loading) complete removal of 20 mgL−1 phenol was achieved in 90 min. In terms of organic carbon removal, about 81% mineralization yield was reached in the optimal conditions for 6 h heterogeneous P-Co/PMS system, suggesting an effective process for phenol mineralization. Four organics intermediates were observed and three of them were identified as catechol, hydroquinone and benzoquinone. A reaction sequence was therefore proposed for the degradation according to the detected products. Subsequent attack of these intermediates by SO4 − radicals led to the formation of short chain acids such as, acetic, formic and oxalic acid which were identified by ion-exclusion chromatography.read more
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A review of the innovations in metal- and carbon-based catalysts explored for heterogeneous peroxymonosulfate (PMS) activation, with focus on radical vs. non-radical degradation pathways of organic contaminants
TL;DR: In this paper, the authors summarize the rapid development of various heterogeneous catalysts developed for peroxymonosulfate (PMS) activation, destined for the degradation of organic contaminants.
Journal ArticleDOI
MIL-101(Fe)/g-C3N4 for enhanced visible-light-driven photocatalysis toward simultaneous reduction of Cr(VI) and oxidation of bisphenol A in aqueous media
Feiping Zhao,Feiping Zhao,Yongpeng Liu,Samia Ben Hammouda,Bhairavi Doshi,Néstor Guijarro,Xiaobo Min,Chong-Jian Tang,Mika Sillanpää,Kevin Sivula,Shaobin Wang +10 more
TL;DR: In this article, a MIL-101(Fe)/g-C3N4 heterojunction was synthesized via in-situ growth of MIL- 101(Fe) onto g-C 3N4 surface and applied as a bifunctional photocatalyst for simultaneous reduction of Cr(VI) and degradation of BPA under visible light.
Journal ArticleDOI
Activation of peroxymonosulfate by sludge-derived biochar for the degradation of triclosan in water and wastewater
Shizong Wang,Jianlong Wang +1 more
TL;DR: In this paper, a sludge-derived biochar (SBC) was prepared, characterized and applied to activate peroxymonosulfate (PMS) for the degradation of triclosan (TCS) in water and wastewater.
Journal ArticleDOI
Catalytic oxidation of aqueous organic contaminants by persulfate activated with sulfur-doped hierarchically porous carbon derived from thiophene
TL;DR: In this paper, a novel sulfur-doped hierarchically porous carbon with both structural and compositional modification was proposed for persulfate (PS) activation by using thiophene as sulfur/carbon precursor and KOH as activator.
Journal ArticleDOI
Recent advances in the bio-remediation of persistent organic pollutants and its effect on environment
TL;DR: A comprehensive review of the current state of research activities on the application of biodegradation/bioremediation for removing persistent organic pollutants (POPs) such as pesticides, PCBs, PAHs and PPCPs from wastewater is presented.
References
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Journal ArticleDOI
Radical generation by the interaction of transition metals with common oxidants.
TL;DR: Nine transition metals were tested for the activation of three oxidants and the generation of inorganic radical species such as sulfate, peroxymonosulfate, and hydroxyl radicals to postulate the rate-determining step of the redox reactions taking place when a metal is coupled with an oxidant in aqueous solution.
Journal ArticleDOI
Generation of sulfate radical through heterogeneous catalysis for organic contaminants removal: Current development, challenges and prospects
TL;DR: In this paper, the authors provide a state-of-the-art review on the development in heterogeneous catalysts including single metal, mixed metal, and nonmetal carbon catalysts for organic contaminants removal, with particular focus on peroxymonosulfate (PMS) activation.
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Application of peroxymonosulfate and its activation methods for degradation of environmental organic pollutants: Review
Farshid Ghanbari,Mahsa Moradi +1 more
TL;DR: A literature review on environmental application of peroxymonosulfate (PMS) in degradation of contaminants to clarify the performance of PMS is carried out in this paper, which describes the PMS usage in remediation of environmental pollutants with focus on the different methods of activation and the effect of main operational parameters on PMS-based processes.
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Cobalt-catalyzed sulfate radical-based advanced oxidation: A review on heterogeneous catalysts and applications
Peidong Hu,Mingce Long +1 more
TL;DR: In this paper, the state-of-the-art progress on various heterogeneous cobalt-based catalysts for sulfate radical-based advanced oxidation processes (SR-AOPs) is reviewed.
Journal ArticleDOI
Degradation of organic contaminants in water with sulfate radicals generated by the conjunction of peroxymonosulfate with cobalt.
TL;DR: The advantage of Co/PMS compared to the traditional Fenton Reagent is attributed primarily to the oxidizing strength of the radicals formed, since sulfate radicals are stronger oxidants than hydroxyl and the thermodynamics of the transition-metal-oxidant coupling.