Comparison of Bomaplex Blue CR-L Removal by Adsorption Using Raw and Activated Pumpkin Seed Shells

Ş. Irdemez, Gizem Özyay, F. Ekmekyapar Torun, Sinan Kul, Züleyha Bingül
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引用次数: 4

Abstract

Abstract In this study, removal of colour from wastewaters prepared synthetically using Bomaplex Blue CR-L was investigated using raw and activated pumpkin seed shells by adsorption in a batch system. The effects of stirring speed, adsorbent concentration, dye concentration, temperature and pH on colour removal were investigated, and adsorption capacities of raw and activated pumpkin seed shells were determined. In addition, adsorption kinetics, isotherm coefficients, activation energies and thermodynamic parameters were calculated. The optimal adsorption conditions were determined as pH = 2, stirring speed of 200 rpm, adsorbent concentration of 10 g L−1 and 30 °C. Under the optimal conditions, the maximum removal efficiency of Bomaplex Blue CR-L using raw pumpkin seed shells was 73.01 %. This value rose to 79.71 % after activation processing was applied. Experimental adsorption data show that the adsorption is more suited to the Langmuir adsorption model and works in accordance with the pseudo-first-order kinetics model. As a result of thermodynamic research, ΔH° and ΔS° were 31.515 kJ mol−1 and 109.952 kJ mol−1 K−1 for the raw adsorbent, respectively. For the activated adsorbent, ΔH° and ΔS° were 43.118 kJ mol−1 and 152.237 kJ mol−1 K−1, respectively. The activation energy of adsorption was calculated as 10.918 kJ mol−1 for the raw adsorbent and 9.882 kJ mol−1 for the activated adsorbent.
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原料南瓜籽壳与活化南瓜籽壳吸附去除Bomaplex Blue CR-L的比较
摘要本研究以原料南瓜籽壳和活化南瓜籽壳为原料,采用间歇式吸附法对Bomaplex Blue CR-L合成废水进行了脱色研究。考察了搅拌速度、吸附剂浓度、染料浓度、温度和pH对去色的影响,并测定了原料南瓜籽壳和活化南瓜籽壳的吸附能力。计算了吸附动力学、等温线系数、活化能和热力学参数。最佳吸附条件为:pH = 2,搅拌速度200 rpm,吸附剂浓度10 g L−1,温度30℃。在最佳条件下,南瓜籽壳对Bomaplex Blue CR-L的最大去除率为73.01%。应用活化处理后,该值上升到79.71%。实验数据表明,吸附更符合Langmuir吸附模型,符合准一级动力学模型。热力学研究结果表明,原料吸附剂的ΔH°和ΔS°分别为31.515 kJ mol−1和109.952 kJ mol−1 K−1。对于活性吸附剂,ΔH°和ΔS°分别为43.118 kJ mol−1和152.237 kJ mol−1 K−1。计算得到原料吸附剂的吸附活化能为10.918 kJ mol−1,活性吸附剂的吸附活化能为9.882 kJ mol−1。
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