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Removal of Phenol from Aqueous Solutions by Activated Red Mud
Mehdi Shirzad Siboni,Seyed Javad Jafari,Mehrdad Farrokhi,Jae Kyu Yang 대한환경공학회 2013 Environmental Engineering Research Vol.18 No.4
In this work, removal of phenol from aqueous solutions by activated red mud was investigated. Scanning electron microscopy and energy dispersive X-ray spectroscopy was used to observe the morphology and surface components of activated red mud, respectively. The effects of various parameters on the removal efficiency were studied, such as contact time, pH, initial phenol concentration, and adsorbent dosage. The removal percentage of phenol was initially increased, as the solution pH increased from 3 to 7, and then decreased above neutral pH. The removal percentage of phenol was decreased by increasing the initial phenol concentrations. Adsorption results show that equilibrium data follow the Freundlich isotherm, and kinetic data was well described by a pseudo-second-order kinetic model. Experimental results show that the activated red mud can be used to treat aqueous solutions containing phenol, as a low cost adsorbent with high efficiency.
Mehdi Shirzad-Siboni,Alireza Khataee,주상우,Fatemeh Vafaei 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.8
Scallop shell was used as a low-cost adsorbent for removal of two anionic textile dyes, Reactive Blue 19(RB19) and Acid Cyanine 5 R (AC5R), from aqueous solutions. The adsorbent was characterized using inductivelycoupled plasma optical emission spectrometry (ICP-OES), X-ray diffraction (XRD), Fourier transform infrared spectroscopy(FT-IR) and scanning electron microscopy (SEM). The dye removal efficiency of scallop shell was determinedas function of contact time, solution pH, initial dye concentration and adsorbent dosage. With increasing dye concentration,the adsorption of both dyes decreased, while it increased with increasing adsorbent dosage. Optimum removalof RB19 and AC5R was achieved at pH=6. Adsorption equilibrium data were well described by the Freundlich model. The maximum dye adsorption capacity of scallop shell as estimated from the Langmuir isotherm was 12.36 and 12.47mg/g for RB19 and AC5R, respectively. The adsorption kinetic data showed excellent correlation with the pseudosecond-order model. It was concluded that scallop shell has a remarkable potential for the sorption of RB19 and AC5Rand can be used for treatment of the dye contaminated wastewater.
Application of Ni-doped ZnO rods for the degradation of an azo dye from aqueous solutions
Mehdi Shirzad-Siboni,Mitra Gholami,Jae-Kyu Yang 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.3
Ni-doped ZnO rods were applied as a photocatalyst for the degradation of an azo dye (Reactive Black 5). Effects of solution pH, catalyst dosage, initial RB5 concentration, H2O2 concentration, different purging gases, and type of organic compounds on the removal efficiency of RB5 were studied. Ni-doped ZnO rods were synthesized by co-precipitation method. Neutral pH was selected as an optimal pH condition due to a photo-corrosion of ZnO in acidic and basic conditions. Photocatalytic degradation efficiency of RB5 was increased as the catalyst dosage increased up to 1 g/ L, while it was decreased by increasing initial RB5 concentration. Pseudo-first-order rate constant (kobs) decreased from 0.122 to 0.0051 min−1 and electrical energy per order (EEo) increased from 39.34 to 941.18 (kWh/m3) by increasing RB5 concentration from 5 to 100mg/L, respectively. Photocatalytic degradation efficiency of RB5 increased by increasing H2O2 concentration, but this trend was not observed above 10 mM. Photocatalytic degradation efficiency of RB5 increased in the presence of folic acid and citric acid while interference was observed in the presence of humic acid, EDTA, oxalic acid, and phenol. Photocatalytic activity was maintained even after five successive cycles.
Mehdi Shirzad-Siboni,주상우,Alireza Khataee 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
In the present work removal of an azo dye (Reactive Black 5) was investigated from aqueous solution byadsorption onto scallop as a low-cost and widely available adsorbent. The effect of various operationalparameters, such as contact time, pH, initial dye concentration and adsorbent dosage on the removalefficiency of dye was studied. Removal efficiency declined with the increase in solution pH and initial dyeconcentration but with the decrease in adsorbent dosage. Experimental equilibrium and kinetics datawere fitted by Langmuir and Freundlich isotherms and pseudo-first-order and pseudo-second-orderkinetic models, respectively.
Removal of acid blue 113 and reactive black 5 dye from aqueous solutions by activated red mud
Mehdi Shirzad-Siboni,양재규,Seyed-Javad Jafari,Omid Giahi,김임순,이승목 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Removal of acid blue 113 (AB113) and reactive black 5 (RB5) dyes from aqueous solutions by activated red mud was investigated at different reaction parameters. Activated red mud has higher removal efficiency for AB113 than that for RB5. This can be explained by a greater molecular size of RB5 than that of AB113 and by different binding affinity with the surface of the activated red mud. Equilibrium data was fitted well with Freundlich isotherm and the kinetic data followed a pseudo second-order model. Maximum adsorption capacity was 83.33 mg/g and 35.58 mg/g at pH 3 for AB113 and RB5, respectively.
Photocatalytic reduction of hexavalent chromium with illuminated ZnO/TiO2 composite
Mohammad Naimi-Joubani,Mehdi Shirzad-Siboni,양재규,Mitra Gholami,Mahdi Farzadkia 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
The purpose of this work was to investigate the photocatalytic reduction of Cr(VI) with illuminated ZnO/TiO2 composite at various catalyst dosage, pH, Cr(VI) concentration, purging gas, type of organiccompounds. FT-IR and XRD analysis demonstrated hybridization of ZnO nanoparticles and TiO2 particles. The photocatalytic reduction of Cr(VI) was increased with increasing photocatalyst dosage anddecreasing pH. The reaction rate constant (kobs) was decreased from 0.0879 to 0.0048 min 1 withincreasing Cr(VI) concentration from 20 to 100 mg/L. Removal efficiency of Cr(VI) by UV/ZnO/TiO2process was about 99.99%, which was more effective than that by UV/ZnO (82.33%) and UV/TiO2 process(86.07%).
Azita Mohagheghian,Naghmeh Besharati-Givi,Kobra Ayagh,Mehdi Shirzad-Siboni 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
A convenient and low-cost co-precipitation method was utilized for stabilization of CuO nanoparticles onKaolin. The prepared CuO-Kaolin was characterized by XRD, FT-IR, SEM, EDX and pHPZC techniques. In thisempirical study, response surface methodology (RSM) based central composite design (CCD) was appliedfor optimization of operational factors in the photocatalytic removal of Diazinon (DZ). Under optimumconditions, i.e. initial pH=7, initial DZ concentration=30 mg L-1, photocatalyst amount=0.4g L-1 and inthe presence of oxalic acid, folic acid and sodium carbonate=5 mg L-1, about 87.23 % DZ removal wasachieved by CuO-Kaolin after 180 min of reaction. The ANOVA results of the polynomial model prove thatthe model is quite meaningful (F-value> 0.001 and P-value< 0.0001). Further, estimated electrical energyper order consumption (EEO) for visible light (VIS)/CuO-Kaolin system was calculated as 213.66 kWh m3with operational cost (OC) utilization of 52.053 USD kg1 that was revealed this process is highly feasibleand economic comparing with other photocatalytic processes (VIS/CuO, VIS/Kaolin and VIS). Ten cycleexperiments confirmed that the CuO-Kaolin propounded a satisfied stability and recycling potency. Byapplying the OFAT technique, 96.05 % of DZ degradation and 79.19 % of DZ mineralization could beachieved after 180 min. The five main compounds produced during the VIS/CuO-Kaolin embracing 2-isopropyl-6-methyl-4-pyrimidinol (IMP), diethyl phosphonate, diazoxon, hydroxydiazinon, and diazinonmethyl ketone are formed in the path of DZ degradation. The results of toxicity in the photocatalyticremoval of DZ by D. magna showed LC50 and TU 48 h equal to 18.79 and 5.32 vol percent.
Azita Mohagheghian,Kobra Ayagh,Kazem Godini,Mehdi Shirzad-Siboni 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
Cr(VI) was reduced from synthetic, real drinking waters and real electroplating wastewater using the Fe3O4–WO3-3-aminopropyltriethoxysilane nanoparticles, as a heterogeneous catalyst, in the presence of visible light. The nanocatalyst was prepared via a simple co-precipitation method. FT-IR and SEM techniques proved the effective presence of an amino group. Under the optimum conditions: pH = 2, [Cr(VI)]0 = 10 mg/L, citric Acid = 10 mg/L, and nanocatalyst dosage = 6 g/L, 99.96% of Cr(VI) was removed after 300 min. Approximately 82.96% of Cr(VI) in a real water sample was removed after 1440 min under the optimal circumstances. Also, full treatment of electroplating wastewater was reached after 2880 min.