scispace - formally typeset
Search or ask a question
Author

Mahsa Moradi

Bio: Mahsa Moradi is an academic researcher from Tarbiat Modares University. The author has contributed to research in topics: Wastewater & Photocatalysis. The author has an hindex of 18, co-authored 25 publications receiving 1964 citations. Previous affiliations of Mahsa Moradi include Shahid Beheshti University of Medical Sciences and Health Services & Semnan University.

Papers
More filters
Journal ArticleDOI
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.

1,650 citations

Journal ArticleDOI
TL;DR: In this article, the effects of initial pH, electrical current and electrolysis time on textile wastewater decolorization were evaluated and the results indicated that the ECF process was more effective than the other processes with regard to color and COD removals.
Abstract: The main problem of textile wastewater is strong color which must be removed before discharge to the environment. Electrochemical processes have been separately studied for decolorization of synthetic dyes and colored wastewater. In this study, iron-based electrochemical processes including electrocoagulation (EC), electrochemical Fenton (ECF), electro-Fenton (EF) and peroxi-coagulation (PC) were applied for real textile wastewater decolorization in similar conditions. The effects of initial pH, electrical current and electrolysis time on decolorization were evaluated. COD removal, electrical energy consumption, iron consumption and BOD 5 /COD ratio of each process were compared. All the processes sufficiently removed color from the wastewater in as much as between 77% and 94% decolorization efficiency was gained. The results indicated that decolorization efficiency in EC and EF processes was strongly dependent on initial pH. At optimum conditions, the highest energy consumption and iron consumption were found in EF and PC respectively. Electrochemical processes based on Fenton reagent (ECF, EF and PC) enhanced BOD 5 /COD ratio from 0.137 to over 0.3 while EC process could not increase BOD 5 /COD ratio significantly. All the processes followed the second order kinetic for COD parameter in optimum conditions. As a comparison from the obtained results, the ECF process was more effective than the other processes with regard to color and COD removals.

173 citations

Journal ArticleDOI
TL;DR: In this paper, Bisphenol A (BPA) was removed using electrogenerated ferrous ion (EC) activated ozone, hydrogen peroxide (HP) and persulfate (PS).

136 citations

Journal ArticleDOI
TL;DR: In this article, peroxymonosulfate (PMS) was activated by zero valent iron (ZVI) to produce sulfate radical for degradation of organic compounds.
Abstract: Textile wastewater must be decolorized before discharging into the environment. In this study, peroxymonosulfate (PMS) was activated by zero valent iron (ZVI) to produce sulfate radical for degradation of organic compounds. The optimum condition for activation of PMS was provided in pH of 4 and 3000 mg/L ZVI. ZVI compared to zero valent copper (ZVC) was more effective in terms of COD and color removals. PMS and H 2 O 2 performances were compared and the results showed that PMS had more efficiency in similar conditions. Simultaneous use of PMS and H 2 O 2 synergically increased decolorization rate. The TOC and COD removal efficiencies of various processes were in the following order: ZVI–PMS–H 2 O 2 ≥ ZVI–PMS > ZVI–H 2 O 2 > ZVC–PMS > ZVC–H 2 O 2 . The average oxidation state (AOS) was considerably increased after oxidation processes using PMS and H 2 O 2. This result indirectly proves biodegradability improvement of real textile wastewater. Finally, the oxidative processes were economically compared based on cost of chemicals.

121 citations

Journal ArticleDOI
TL;DR: In this paper, the activation of peroxymonosulfate (PMS) was investigated by activated carbon (AC) along with UV for 2,4,6-trichlorophenol (TCP) degradation.
Abstract: In this study, the activation of peroxymonosulfate (PMS) was investigated by activated carbon (AC) along with UV for 2,4,6-trichlorophenol (TCP) degradation. The effects of operating parameters including pH, PMS concentration, AC dosage, initial TCP concentration and reaction time on TCP degradation were studied and optimized at pH 5.0, 8.0 mM PMS, 0.75 g/L AC and 75 min. Single step or two step additions of PMS made no marked difference in terms of TCP removal. The results of PMS decomposition showed that, AC/UV configuration was able to significantly activate PMS to degrade TCP compared to sole application of AC or UV. The contribution of UV in activation of PMS was more than that of AC. The rate constants of TCP degradation were in range of 0.0103–0.0512 min −1 for initial TCP concentrations of 5–50 mg/L. Scavenging experiments revealed that sulfate radical was the dominant radical of its kind for degradation of TCP, although hydroxyl radical was also partly effective. The results indicated that contribution of free radicals in solution was higher than that of surface-bound radicals. Moreover, mineralization of TCP was evaluated by COD, TOC and chlorine release and related results were 50.2%, 31.2% and 55%, respectively.

105 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: Sulfate radical-based advanced oxidation processes (AOPs) have received increasing attention in recent years due to their high capability and adaptability for the degradation of emerging contaminants as mentioned in this paper.

2,267 citations

Journal ArticleDOI
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.
Abstract: Sulfate radical-based advanced oxidation processes (SR-AOPs) employing heterogeneous catalysts to generate sulfate radical (SO4 −) from peroxymonosulfate (PMS) and persulfate (PS) have been extensively employed for organic contaminant removal in water. This article aims to provide a state–of–the–art review on the recent development in heterogeneous catalysts including single metal, mixed metal, and nonmetal carbon catalysts for organic contaminants removal, with particular focus on PMS activation. The hybrid heterogeneous catalyst/PMS systems integrated with other advanced oxidation technologies is also discussed. Several strategies for the identification of principal reactive radicals in SO4 −–oxidation systems are evaluated, namely (i) use of chemical probe or spin trapping agent coupled with analytical tools, and (ii) competitive kinetic approach using selective radical scavengers. The main challenges and mitigation strategies pertinent to the SR-AOPs are identified, which include (i) possible formation of oxyanions and disinfection byproducts, and (ii) dealing with sulfate produced and residual PMS. Potential future applications and research direction of SR-AOPs are proposed. These include (i) novel reactor design for heterogeneous catalytic system based on batch or continuous flow (e.g. completely mixed or plug flow) reactor configuration with catalyst recovery, and (ii) catalytic ceramic membrane incorporating SR-AOPs.

1,802 citations

Journal ArticleDOI
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.

1,650 citations

Journal ArticleDOI
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.
Abstract: Recently sulfate radical-based advanced oxidation processes (SR-AOPs) attract increasing attention due to their capability and adaptability in decontamination. The couple of cobalt and peroxymonosulfate (PMS) is an efficient way to produce reactive sulfate radicals. This article reviews the state-of-the-art progress on various heterogeneous cobalt-based catalysts for PMS activation, including cobalt oxides, cobalt-ferrite and supported cobalt by diverse substrates. We summarize the intrinsic properties of these catalysts and their fundamental behaviors in PMS activation, as well as synthetic approaches. In addition, influencing factors and synergistic techniques of Co/PMS systems in organic degradation and possible environmental applications are also discussed. Finally, we propose perspectives on challenges related to cobalt-based catalysts, heterogeneous Co/PMS systems and their potential applications in practical environmental cleanup.

1,553 citations

Journal ArticleDOI
TL;DR: This Critical Review comparatively examines the activation mechanisms of peroxymonosulfate and peroxydisulfates and the formation pathways of oxidizing species and the impacts of water parameters and constituents such as pH, background organic matter, halide, phosphate, and carbonate on persulfate-driven chemistry.
Abstract: Reports that promote persulfate-based advanced oxidation process (AOP) as a viable alternative to hydrogen peroxide-based processes have been rapidly accumulating in recent water treatment literature. Various strategies to activate peroxide bonds in persulfate precursors have been proposed and the capacity to degrade a wide range of organic pollutants has been demonstrated. Compared to traditional AOPs in which hydroxyl radical serves as the main oxidant, persulfate-based AOPs have been claimed to involve different in situ generated oxidants such as sulfate radical and singlet oxygen as well as nonradical oxidation pathways. However, there exist controversial observations and interpretations around some of these claims, challenging robust scientific progress of this technology toward practical use. This Critical Review comparatively examines the activation mechanisms of peroxymonosulfate and peroxydisulfate and the formation pathways of oxidizing species. Properties of the main oxidizing species are scrutinized and the role of singlet oxygen is debated. In addition, the impacts of water parameters and constituents such as pH, background organic matter, halide, phosphate, and carbonate on persulfate-driven chemistry are discussed. The opportunity for niche applications is also presented, emphasizing the need for parallel efforts to remove currently prevalent knowledge roadblocks.

1,412 citations