Effective and Simple NaOH-Modification Method to Remove Methyl Violet Dye via Ipomoea aquatica Roots

IF 2.8 4区工程技术 Q2 CHEMISTRY, APPLIED

Adsorption Science & Technology Pub Date : 2021-10-13 DOI:10.1155/2021/5932222

YieChen Lu, M. R. R. Kooh, L. Lim, N. Priyantha

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引用次数: 25

Abstract

In this study, a simple chemical modification was applied to a sustainable and abundantly available resource, kangkong root (KR), to remove methyl violet 2B (MV) dye. The chemically modified adsorbent (NaOH-KR) was obtained using NaOH solution treatment. Batch adsorption experiments were carried out to investigate the effects of pH, ionic strength, contact time, adsorbent dosage, and initial dye concentration. A regeneration experiment was also carried out to assess the potential of reusability. The adsorption process was modelled using various kinetics and isotherm models, whereby the best-fitting models were evaluated by using the coefficient of determination ( R 2 ) and error functions. The Sips ( R 2 = 0.9714 , χ2 =0.16) and pseudo-second-order ( R 2 = 0.9996 , χ 2 = 0.007 ) models were identified to best represent the adsorption process. The Sips model predicted a maximum adsorption capacity at 551.5 mg g-1 for NaOH-KR, which is 55% improvement in performance when compared to nonmodified KR. Lastly, the regeneration experiment showed that NaOH-KR was able to maintain reasonable dye removal even after five consecutive cycles of regenerating and reusing.

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有效、简便的氢氧化钠改性法去除水草根甲基紫染料

本研究采用简单的化学改性方法对资源丰富、可持续发展的康孔根(KR)进行甲基紫2B (MV)染料的脱除。采用氢氧化钠溶液处理制得化学改性吸附剂NaOH- kr。通过批量吸附实验考察了pH、离子强度、接触时间、吸附剂用量、初始染料浓度等因素对吸附效果的影响。还进行了再生实验，以评估可重复使用的潜力。采用各种动力学和等温线模型对吸附过程进行了建模，并利用决定系数(r2)和误差函数对最佳拟合模型进行了评价。Sips模型(r2 = 0.9714， χ2 =0.16)和伪二阶模型(r2 = 0.9996， χ2 = 0.007)最能反映吸附过程。Sips模型预测NaOH-KR的最大吸附量为551.5 mg g-1，与未改性的KR相比，性能提高了55%。最后，再生实验表明，即使经过连续5次再生和再利用，NaOH-KR仍能保持合理的染料去除率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Adsorption Science & Technology 工程技术-工程：化工

CiteScore

5.00

自引率

10.30%

发文量

181

审稿时长

4.5 months

期刊介绍： Adsorption Science & Technology is a peer-reviewed, open access journal devoted to studies of adsorption and desorption phenomena, which publishes original research papers and critical review articles, with occasional special issues relating to particular topics and symposia.