Methylene blue removal by adsorption on unmodified and modified wood sawdust

D. Drljaca, A. Borkovic, Dajana Dragic, T. Botic, Violeta Mićanović, G. Popovic, Ljiljana Vukic, P. Dugic
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Abstract

Adsorption, as an easy and effective technique, is widely used to remove a large number of dyes from aqueous solutions. Activated carbon is the most desirable adsorbent, but due to its high cost, its use is limited. Proving the possibility of adsorption and its efficiency performed on cheap adsorbents is a great challenge and interest of many researchers in the past few decades. In this paper, unmodified (P) and modified sawdust obtained in two ways (HCl treatment and NaOH treatment), labeled as PHCl and PNaOH, are used for the removal of the methylene blue dye. Adsorption experiments showed that the optimal time for adsorption is different, for the sample PNaOH – 30 min, for the sample P – 45 min, and for the sample PHCl – 60 min. By applying nonlinear kinetic models to the experimentally obtained data, it was found that the best model that describes this adsorption is pseudo-second-order model. By examining the effect of pH values on adsorption, different results were obtained (for samples P and PHCl the optimal pH value is pH=11, the PNaOH sample is effective in a wider range of pH values). The analysis of the effect adsorbent dose on adsorption process showed that the efficiency of dye removal decreases with increasing mass of adsorbents. The obtained values of the coefficient of determination in Freundlich's model for samples of unmodified (P) and modified sawdust (PNaOH) indicate that the adsorption of the methylene blue dye is multilayer type adsorption. For the PHCl sample, neither the Langmuir nor Freundlich model adequately described MB dye adsorption.
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未改性和改性木屑对亚甲基蓝的吸附去除
吸附法作为一种简单有效的技术,被广泛用于去除水中的大量染料。活性炭是最理想的吸附剂,但由于其成本高,其使用受到限制。在过去的几十年里,证明廉价吸附剂吸附的可能性及其效率是许多研究人员的一个巨大挑战和兴趣。本文采用HCl处理和NaOH处理两种方式得到的未改性(P)和改性木屑,分别标记为PHCl和PNaOH,用于去除亚甲基蓝染料。吸附实验表明,PNaOH -的最佳吸附时间为30 min, P -的最佳吸附时间为45 min, PHCl -的最佳吸附时间为60 min。通过对实验得到的数据进行非线性动力学模型分析,发现描述该吸附过程的最佳模型为伪二阶模型。通过考察pH值对吸附的影响,得到了不同的结果(P和PHCl样品的最佳pH值为pH=11, PNaOH样品在更大的pH值范围内有效)。吸附剂用量对吸附过程的影响分析表明,随着吸附剂质量的增加,对染料的去除率降低。对未改性木屑(P)和改性木屑(PNaOH)样品的Freundlich模型测定系数值表明,亚甲基蓝染料的吸附为多层吸附。对于PHCl样品,Langmuir和Freundlich模型都不能充分描述MB染料吸附。
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