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Review on the main advances in photo-Fenton oxidation system for recalcitrant wastewaters
Shima Rahim Pouran,A.R. Abdul Aziz,Wan Mohd Ashri Wan Daud 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
This paper reviews themain advances in photo-Fenton oxidation treatment for recalcitrant wastewaters. This oxidation method is able to produce biodegradable intermediates and mineralize such pollutantseffectively when the main operational conditions are at optimum level. However, cost of the process isone of the main limitations. Several strategies have been put in practice to minimize cost and improvephoto-Fenton efficiency primarily through application of heterogeneous catalysts and/or chelatingagents. In addition, cost can be further reduced by applying solar energy and integrating biologicaltreatment technologies in the treatment process.
Hybrid of Fenton and sequencing batch reactor for petroleum refinery wastewater treatment
B.H. Diya’uddeen,Shima Rahim Pouran,A.R. Abdul Aziz,S.M. Nashwan,Wan Mohd Ashri Wan Daud,M.G. Shaaban 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-
The treatment of high-strength petroleum refinery effluent (PRE) with [BOD5]/[COD]0 = 0.14 was investigated using combined Fenton–sequencing batch reactor (SBR). The effect of [H2O2]:[COD]0 molar ratio on biodegradability enhancement was investigated. Fenton optimal conditions were: [H2O2]:[COD]0 of 6, [H2O2]:[Fe0] of 10 and pH = 3.0 that could remove 76.5%, 45% and 96% of COD, TOC and phenol and increased biodegradability ratio to 0.37. The pretreated PRE subjected to SBR for one single cycle of 10 h. The results revealed the effectiveness of hybrid Fenton–SBR system in treating PRE where the complete treatment of the PRE was attained by this system.
Alireza Khataee,Saeed Sajjadi,Shima Rahim Pouran,Aliyeh Hasanzadeh 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.56 No.-
Herein, air, argon, nitrogen and oxygen plasmas were used in glow discharge plasma under alternativecurrent to enhance the surface properties of graphite. The plasma-treated graphite electrodes (PTGE)were used as cathode in electro-Fenton (EF) for Acid Orange 7 (AO7) degradation. O2-PTGE exhibited thebest activity owing to its improved surface characteristics. Later, the effects of the main operationalcondition on O2-PTGE efficacy in EF and the stability of O2-PTGE were evaluated and degradationintermediates were identified. Finally, the performance of the studied system was assessed inheterogeneous condition using martite as catalyst and compared with homogeneous system.
Khataee, Alireza,Sajjadi, Saeed,Pouran, Shima Rahim,Hasanzadeh, Aliyeh,Joo, Sang Woo Elsevier 2017 ELECTROCHIMICA ACTA Vol.244 No.-
<P><B>Abstract</B></P> <P>The present study reports a simple modified method that enhanced the surface characteristics of graphite electrode towards greater hydrogen peroxide production. In this method, the plasmas of various gases vis. air, argon and nitrogen were used in alternating current glow discharge plasma (AC-GDP) technique to treat graphite surface. The morphology, microstructure, roughness, disorder degree, surface chemical composition and carbon state of the graphite samples were determined before and after plasma treatments. The formation of 3D nanostructures and enhancement in surface characteristics resulted in effective H<SUB>2</SUB>O<SUB>2</SUB> generation over the plasma-treated electrodes. Particularly, air plasma-treated electrode showed higher efficiencies by producing 119μmol/L H<SUB>2</SUB>O<SUB>2</SUB>, owing to etching effect of oxygen-content and improved wettability. Furthermore, the pH, applied current and electrolyte concentration had distinct effects on the H<SUB>2</SUB>O<SUB>2</SUB> yield. The results indicated that AC-GDP using air plasma can be a promising technique for developing high efficient graphite electrodes for facile electro-generation of hydrogen peroxide.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Air, Ar and N<SUB>2</SUB> gases were used in alternating current glow discharge plasma method. </LI> <LI> The employed plasmas resulted in 3D nanostructured-surface of graphite electrodes. </LI> <LI> The plasma-treated electrodes gave rise to greater H<SUB>2</SUB>O<SUB>2</SUB> electro-production. </LI> <LI> Air-GDP was the most effective. owing to etching effect of the oxygen-content. </LI> <LI> pH, current and electrolyte concentration had distinct effects on accumulated H<SUB>2</SUB>O<SUB>2</SUB>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Schematic illustration of the preparation of nanostructured graphite samples by treatment under air, N<SUB>2</SUB> and Ar plasmas.</P> <P>[DISPLAY OMISSION]</P>
Mahsa Pirhashemi,Aziz Habibi-Yangjeh,Shima Rahim Pouran 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-
Among the popular photocatalysts, ZnO is one of the most potent photocatalysts considering its green properties, cheap price, and durability. However, the practical application of ZnO is limited because of its large band gap energy and rapid recombination of the photoinduced electron–hole pairs. This paper reviews the main advancements in overcoming the barriers accompanied by pure ZnO and the criteria for fabrication of effective visible-light-responsive ZnO-based photocatalysts. Herein, the binary ZnO-based nanocomposites with p–n heterojunctions, n–n heterojunctions, and ternary ZnO-based nanocomposites based on different heterostructures, and their mechanism for enhanced light harvesting and charge separation/transfer were thoroughly discussed.