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Mohammad Ebrahim Olya,Azam Pirkarami 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.8
This paper reports an investigation into the effect of a number of operating factors on the removal of Ponceau 4R (Acid Red 18) from an aqueous solution through photodegradation in the presence of nitrogen. N2 was doped in situ on Cu-TiO2. The photocatalyst was UV/TiO2-Cu applied in suspension to the solution to achieve a larger catalyst surface area. The optimal values of photocatalyst dose, dye concentration, and pH were found to be 0.8mg L−1, 20mg L−1, and 7, respectively. The nitrogen gas was found to have a highly positive role in degradation. The aqueous solution was characterized for its COD. Photocatalyst efficiency was evaluated using XRD, SEM, and EPR techniques. The post-treatment product was characterized using FT-IR, HPLC, and GC-MS studies, intermediate compounds were detected, and a pathway was proposed for the degradation of the dye.
Mohammad Saber Araghi,Mohammad Ebrahim Olya,Reza Marandi,Seyed Davar Siadat 한국응용생명화학회 2016 Applied Biological Chemistry (Appl Biol Chem) Vol.59 No.3
In this study, the influence of bacteria and activated carbon adjacent was investigated on treatment and decolorization of synthetic wastewater in a Biological Activated Carbon process. Pseudomonas putida was selected as a bacterial strain capable of degrading aromatic compounds and Acid Blue 92 was used as model azo dye. The optimum conditions for environmental factors affecting decolorization of azo dye was achieved from series of batch experiments. At 25 °C and pH7 the highest efficiency was obtained. At concentration of 20 mg L−1 in batch process, more than 90 % of Acid Blue 92 was reduced in color within just 3 h under optimum conditions. Dual-beam UV–Visible spectrometry and plate assay confirmed biodegradation of the dye by P.putida. The optimum values were then used for continues process. It was found that flow rate and thereby retention time has a critical role in biofilter efficiency. A lab-scale submerged downflow GAC column was sustained by bacterial strain to form the biofilter. About 70 % decolorization was obtained in continuous biological activated carbon process within 2 h with 60 mL h−1 flow rate while adsorption of dye reached the equilibrium and no further dye removal observed. Our results suggest the potential use of P. putida in azo dye decolorization. The combination of activated carbon adsorption and biodegradation by bacterial strains capable of degrading xenobiotic proved to be a promising technique for treatment of dye-contaminated wastewater.
Removal of azo dye from aqueous solution using an anionic polymeric urethane absorbent (APUA)
Azam Pirkarami,Mohammad Ebrahim Olya,Farhood Najafi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
This paper is a report on an original research which investigated the effect of a number of experimentalparameters on the removal of Food Red 17 (FR17) from an aqueous solution using anionic polymericurethane absorbent (APUA) as an adsorbent. The optimum value of adsorbent dose was found to be35 mg L 1. Further, maximum dye removal took place at pH 3 and 45 8C. The fourth parameter, stirringthe solution during the treatment, also resulted in significant removal improvement. The amount of FR17adsorbed on APUA surface was quantified using the Langmuir equation. UV irradiation was also found tohave a positive effect on the removal process. The efficiency of the treatment was verified using FT-IRspectrometry results for APUA, FR17, and APUA-FR17. Finally, the adsorbent was subjected to SEMcharacterization.
Arash Almasian,Niyaz Mohammad Mahmoodi,Mohammad Ebrahim Olya 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-
The surface of polyacrylonitrile (PAN) nanofiber was modified by Tectomer and its dye removal abilityfrom binary systems was studied. The characteristics of nanofibers were investigated by FTIR, AFM, SEM,BET and BJH methods. FTIR showed successful grafting of Tectomer to the surface through the formationof imine group. Decrease in the average roughness and total surface area of nanofiber were detected byAFM and BET analysis, respectively. The adsorption capacity of Tectomer grafted nanofiber for Direct Red80 and Direct Red 23 was 1250 and 1111 mg/g, respectively. Adsorption of dyes follows the Langmuirisotherm and pseudo-second order kinetics.
Shabnam Hasani,Faramarz Doulati Ardejani,Mohammad Ebrahim Olya 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.8
Adsorption of BR 18 dye onto nano-clay adsorbent was investigated. Nano-clay was characterized by using FTIR, SEM, TEM, XRD and BET analysis. The percent removal increased by increasing nano-clay dose, while pH and stirring speed had no significant effect on the adsorption rate. It was observed that the uptake of dye onto nano-clay initially increased rapidly, and then decreased slowly until the equilibrium was reached. The adsorption capacity rose with an increase in temperature. Moreover, the adsorption kinetics was very fast and followed a pseudo second-order. The intra-particle diffusion was observed to be the rate-controlling step. In addition, equilibrium data fitted well with the Langmuir adsorption model. This paper also presents a numerical simulation incorporating the second-order kinetic expression using COMSOL Multiphysics software. The numerical modelling results and the experimental data were in excellent agreement.