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Asim Olgun,Necip Atar 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.5
The present study examined the use of waste containing boron impurity (BC) from boron enrichment plant for the removal of lead (II) and nickel (II) from aqueous solutions. The effects of pH, contact time,initial dye concentration, adsorbent dosage, and temperature on the adsorption process were examined. Residual lead and nickel concentration reached in equilibrium in 90 min and the rate of adsorption by BC was rapid in the first 45 min of the reaction time. The pseudo- second-order kinetic model best described the kinetic of the adsorption. Batch adsorption studies showed that the adsorption patterns followed Langmuir isotherm model.
Ferdag Colak,Asim Olgun,Necip Atar,Demet Yazıcıoglu 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3
Continuous fixed-bed column and batch biosorption studies were conducted to examine the effectiveness of Paenibacillus polymyxa as an adsorbent for the removal of copper and nickel from aqueous solutions. Experimental data obtained has been fitted well with Langmuir isotherm model and also exhibited very high correlation coefficients which confirmed suitability of the model and biosorption process. Differences among batch and continuous isotherms were observed; the maximum uptake capacity of Cu(II) and Ni(II) in batch system was about 49.8 (mg/g) and 35.02 (mg/g), respectively. Furthermore, the effects of heavy metals on micro-organism growth were studied.
Vinod Kumar Gupta,Shilpi Agarwal,Asim Olgun,Halil I brahim Demir,Mehmet Lutfi Yola,Necip Atar 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
In this study, the removal of cationic dyes, Basic Red 46 (BR46) and Basic Blue 41 (BB41), from aqueoussolution using boron enrichment waste (BW) and molasses modified boron enrichment waste (MBW)based nanoclays was presented in a batch system and fixed-bed column system. The effects of pH,contact time, initial solution concentration, adsorbent dosage, temperature of batch operation on theuptake of both dyes were investigated. The adsorption data were further performed on the basis ofkinetic and isotherm models. According to the results, the dye removal capacity of MBW was higher thanthat of BW. The studies demonstrated that the adsorption patterns occurred according to Langmuirisotherm model and pseudo-second-order kinetic model. The adsorption of two dyes is spontaneous andexothermic in nature. Breakthrough curves obtained from fixed-bed column tests showed that columnadsorption capacities provided strong evidence of the potential of the nanoclay for the technologicalapplications of the basic dyes removal from aqueous solutions.