戊二醛交联壳聚糖去除水中2,4-二氯苯氧乙酸的吸附性能及机理,Environmental Science: Water Research & Technology

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戊二醛交联壳聚糖去除水中2,4-二氯苯氧乙酸的吸附性能及机理
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2022-12-06 , DOI: 10.1039/d2ew00638c
Qing Li ₁ , Heng Su ₂ , Yunhui Yang ₃ , Jingjing Zhang ₁ , Chuanhai Xia ₂ , Zhanyong Guo ₁

Affiliation

在这项工作中，制备了戊二醛交联壳聚糖 (GCC)，并系统地研究了其从水溶液中去除 2,4-二氯苯氧乙酸 (2,4-D) 的能力。对吸附条件、等温线模型、动力学模型和热力学进行了批量实验，以评估 GCC 从水溶液中去除 2,4-D 的能力。在最佳吸附条件下，2,4-D 的吸附容量达到 252.55 mg g ^-1 ，pH 值为 3，投加量为 500 mg L ^-1。2,4 -D的吸附等温线可以用 Freundlich 模型表示，因为到高R ² (0.9986)。吸附动力学可以用伪二级动力学更好地表示 ( R ²> 0.99）。温度和热力学实验的影响表明吸附是放热的和自发的。对于另外两种苯氧羧酸类除草剂（4-氯苯氧乙酸和2-（2,4-二氯苯氧）丙酸），GCC在相同的实验条件下也表现出良好的吸附性能。同时，GCC可以从稀释的工业废水中去除75.2%的2-氯苯氧乙酸（2-CPA）、77.9%的4-CPA和87.2%的2,4-D。可重用性实验表明，GCC 在用乙醇再生 5 个循环后仍保持其可用性。

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Adsorption property and mechanism of glutaraldehyde-crosslinked chitosan for removal of 2,4-dichlorophenoxyacetic acid from water

In this work, glutaraldehyde-crosslinked chitosan (GCC) was prepared and its ability to remove 2,4-dichlorophenoxyacetic acid (2,4-D) from aqueous solutions was systematically studied. Batch experiments on adsorption conditions, isotherm models, kinetic models, and thermodynamics were performed to evaluate the ability of GCC for 2,4-D removal from aqueous solution. Under optimal adsorption conditions, the adsorption capacity for 2,4-D reached 252.55 mg g⁻¹ with a dosage of 500 mg L⁻¹ at pH 3. The adsorption isotherm of 2,4-D could be represented by the Freundlich model due to the high R² (0.9986). Adsorption kinetics could be better represented by pseudo-second order kinetics (R² > 0.99). The effect of temperature and thermodynamic experiments illustrated that the adsorption was exothermic and spontaneous. For other two phenoxycarboxylic acid herbicides (4-chlorophenoxyacetic acid and 2-(2,4-dichlorophenoxy)propionic acid), GCC also showed good adsorption performance under identical experimental conditions. Meanwhile, GCC can remove 75.2% of 2-chlorophenoxyacetic acid (2-CPA), 77.9% of 4-CPA, and 87.2% of 2,4-D from diluted industrial effluent. The reusability experiments indicated that GCC retained its usability after being regenerated with ethanol for five cycles.

更新日期：2022-12-07

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