Zirconium(IV)-Loaded Amino Functionalized Walnut Shell for Efficient Adsorption of Phosphate and 2,4-Dichlorophenoxyacetic Acid from Water

IF 2.9 4区 工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY
Xiaoxuan Ma, Lihui Chen, Evan Dovi, Lingbo Qu, Runping Han
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Abstract

A cost-effective adsorbent (AWS@Zr) was synthesized from walnut shell using Zirconium and amino group modification for the uptake of 2,4-dichlorophenoxyacetic acid (2,4-D) and phosphate (PO43−). Characterization of the adsorbents revealed a significant difference in the physicochemical parameters of pristine and functionalized walnut shell. Langmuir model was observed to predict adsorption of 2,4-D, while Freundlich model best-fitted PO43− adsorption with chemisorption being the principal underlying mechanism. The adsorption phenomena were pH dependent with Langmuir maximum capacity of 227.4 ± 5.4 mg g−1 and 73.9 ± 3.2 mg g−1 for 2,4-D and PO43−, respectively. Kinetic models were also used to analyze the experimental data, and remarkable determined coefficients favor the pseudo-second-order kinetic model for the batch systems. The column experiments were carried out as a function of adsorbates flow rate, initial feed of 2,4-D and PO43− concentration, bed depth. The results indicated both Thomas and Clark models could predict uptake of 2,4-D and phosphate with Thomas maximum capacity as 195.5 ± 1.0 for 2,4-D and 87.4 ± 0.7 mg g−1 for PO43− at optimum flow rate of 10 mL min−1 and bed depth of 6 cm. Moreover, the column isotherm studies revealed that the Langmuir model predicted the adsorption data of PO43−, and 2,4-D, which was consistent with batch adsorption of 2,4-D. The studied pollutants onto AWS@Zr are PO43− > 2,4-D based on the β−1 obtained from the column’s mass transfer analysis. Adsorption–desorption studies revealed the reusability potentials of AWS@Zr. Zr and amino in surface of AWS@Zr play major role during removal of 2,4-D and PO43−. There is potential for AWS@Zr to remove some anionic pollutants from solution.

Abstract Image

Abstract Image

锆(IV)负载的氨基功能化核桃壳用于高效吸附水中的磷酸盐和 2,4-二氯苯氧乙酸
利用锆和氨基改性从核桃壳中合成了一种具有成本效益的吸附剂(AWS@Zr),用于吸附 2,4-二氯苯氧乙酸(2,4-D)和磷酸盐(PO43-)。吸附剂的表征显示,原始核桃壳和功能化核桃壳的理化参数存在显著差异。据观察,Langmuir 模型可预测 2,4-D 的吸附,而 Freundlich 模型最适合 PO43- 的吸附,化学吸附是主要的基本机制。吸附现象与 pH 值有关,2,4-D 和 PO43- 的 Langmuir 最大吸附容量分别为 227.4 ± 5.4 mg g-1 和 73.9 ± 3.2 mg g-1。动力学模型也用于分析实验数据,确定的显著系数有利于批处理系统的假二阶动力学模型。柱实验是以吸附剂流速、2,4-D 和 PO43- 初始进料浓度、床层深度为函数进行的。结果表明,Thomas 和 Clark 模型都能预测 2,4-D 和磷酸盐的吸附量,在最佳流速为 10 mL min-1 和床层深度为 6 cm 时,Thomas 对 2,4-D 和 PO43- 的最大吸附量分别为 195.5 ± 1.0 和 87.4 ± 0.7 mg g-1。此外,柱等温线研究表明,Langmuir 模型预测了 PO43- 和 2,4-D 的吸附数据,这与 2,4-D 的批量吸附一致。根据柱传质分析得出的β-1,AWS@Zr 吸附的污染物为 PO43- > 2,4-D。吸附-解吸研究揭示了 AWS@Zr 的再利用潜力。AWS@Zr 表面的 Zr 和氨基在去除 2,4-D 和 PO43- 的过程中发挥了重要作用。AWS@Zr 具有从溶液中去除某些阴离子污染物的潜力。
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来源期刊
Korean Journal of Chemical Engineering
Korean Journal of Chemical Engineering 工程技术-工程:化工
CiteScore
4.60
自引率
11.10%
发文量
310
审稿时长
4.7 months
期刊介绍: The Korean Journal of Chemical Engineering provides a global forum for the dissemination of research in chemical engineering. The Journal publishes significant research results obtained in the Asia-Pacific region, and simultaneously introduces recent technical progress made in other areas of the world to this region. Submitted research papers must be of potential industrial significance and specifically concerned with chemical engineering. The editors will give preference to papers having a clearly stated practical scope and applicability in the areas of chemical engineering, and to those where new theoretical concepts are supported by new experimental details. The Journal also regularly publishes featured reviews on emerging and industrially important subjects of chemical engineering as well as selected papers presented at international conferences on the subjects.
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