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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.
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.