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Batch and packed bed techniques for adsorptive aqueous phase removal of selected phenoxyacetic acid herbicide using sugar industry waste ash
International Journal of Chemical Reactor Engineering ( IF 1.2 ) Pub Date : 2020-11-04 , DOI: 10.1515/ijcre-2020-0084
Sunil K. Deokar 1 , Pooja G. Theng 1 , Sachin A. Mandavgane 2
Affiliation  

Abstract Batch and packed bed adsorption of 4-chloro-2-methylphenoxyacetic acid (MCPA) herbicide was performed using bagasse fly ash (BFA) as an adsorbent. In batch process, characteristics of adsorbent, and the influence of adsorbent dosage, initial herbicide concentration, time, pH, particle size of adsorbent and temperature on adsorption were studied. Results disclose higher removal of MCPA on bigger particles of BFA owing to higher specific surface area because of greater carbon and lesser silica percentage in bigger particles. Application of isotherm models in present study indicates the best fitting of Langmuir and Temkin isotherms whereas the kinetic models suggest the suitability of pseudo second order and Elovich models. Thermodynamic study specifies the temperature preferred adsorption process. In packed bed technique, the effect of influent concentration, flow rate and bed height were investigated. The deactivation kinetic model which was previously considered only for studies in gas-solid adsorption is applied in this study to solid-liquid adsorption along with conventional packed bed models. In packed bed study, Bohart-Adams and Wolborska models are appropriate to explain the experimental data upto 60% saturation of the column. The deactivation kinetic model is found the best to elucidate the nature of breakthrough curves till the complete saturation of column. Batch capacity and packed bed capacity per m2 specific surface area of BFA is found about two and three times greater than the previously used adsorbents for MCPA respectively.

中文翻译:

糖业废灰吸附去除苯氧乙酸除草剂水相的批量和填充床技术

摘要 以甘蔗渣飞灰(BFA)为吸附剂,对4-氯-2-甲基苯氧乙酸(MCPA)除草剂进行批量吸附和填充床吸附。在间歇过程中,研究了吸附剂的特性,以及吸附剂用量、除草剂初始浓度、时间、pH、吸附剂粒径和温度对吸附的影响。结果表明,由于较大颗粒中较大的碳和较低的二氧化硅百分比,较大的 BFA 颗粒上的 MCPA 去除率较高,因为比表面积较高。等温线模型在本研究中的应用表明 Langmuir 和 Temkin 等温线的最佳拟合,而动力学模型表明伪二阶和 Elovich 模型的适用性。热力学研究指定了温度优选的吸附过程。在填充床技术中,研究了进水浓度、流速和床层高度的影响。以前仅考虑用于气固吸附研究的失活动力学模型在本研究中与常规填充床模型一起应用于固液吸附。在填充床研究中,Bohart-Adams 和 Wolborska 模型适用于解释高达 60% 柱饱和度的实验数据。发现失活动力学模型最能阐明柱完全饱和之前的穿透曲线的性质。发现 BFA 每平方米比表面积的批次容量和填充床容量分别比以前用于 MCPA 的吸附剂高出约 2 倍和 3 倍。以前仅考虑用于气固吸附研究的失活动力学模型在本研究中与常规填充床模型一起应用于固液吸附。在填充床研究中,Bohart-Adams 和 Wolborska 模型适用于解释高达 60% 柱饱和度的实验数据。发现失活动力学模型最能阐明柱完全饱和之前的穿透曲线的性质。发现 BFA 每平方米比表面积的批次容量和填充床容量分别比以前用于 MCPA 的吸附剂高出约 2 倍和 3 倍。以前仅考虑用于气固吸附研究的失活动力学模型在本研究中与常规填充床模型一起应用于固液吸附。在填充床研究中,Bohart-Adams 和 Wolborska 模型适用于解释高达 60% 柱饱和度的实验数据。发现失活动力学模型最能阐明柱完全饱和之前的穿透曲线的性质。发现 BFA 每平方米比表面积的批次容量和填充床容量分别比以前用于 MCPA 的吸附剂高出约 2 倍和 3 倍。Bohart-Adams 和 Wolborska 模型适用于解释高达 60% 柱饱和度的实验数据。发现失活动力学模型最能阐明柱完全饱和之前的穿透曲线的性质。发现 BFA 每平方米比表面积的批次容量和填充床容量分别比以前用于 MCPA 的吸附剂高出约 2 倍和 3 倍。Bohart-Adams 和 Wolborska 模型适用于解释高达 60% 柱饱和度的实验数据。发现失活动力学模型最能阐明柱完全饱和之前的穿透曲线的性质。发现 BFA 每平方米比表面积的批次容量和填充床容量分别比以前用于 MCPA 的吸附剂高出约 2 倍和 3 倍。
更新日期:2020-11-04
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