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Alkali assisted hydrophobic reinforcement of coconut fiber for enhanced removal of cationic dyes: equilibrium, kinetics, and thermodynamic insight
International Journal of Phytoremediation ( IF 3.4 ) Pub Date : 2021-04-04 , DOI: 10.1080/15226514.2021.1901850
Jhilirani Mohanta 1 , Roshni Kumari 1 , Md Atif Qaiyum 1 , Banashree Dey 2 , Soumen Dey 1
Affiliation  

Abstract

The present study illustrates enhanced removal of methylene blue (MB) and malachite green (MG) from water using alkali-activated coconut fiber (ACF) as adsorbent. Alkali activation effectively reduces the lignocellulosic components present within coco-fiber which in turn reinforces the coco-fiber to become more water-stable. The material was characterized by FTIR, SEM-EDS, BET, XRD, and pHZPC. BET surface area was found to be 10.901 m2 g−1, whereas pHZPC of the material is 6.05. FESEM images reveal rod-like morphology. Batch experiments were optimized with respect to contact time (0–120 min), temperature (288–308 K), pH (3–10), dose (1–5 g) and input dye concentration (10–50 mg L−1). The maximum adsorption coefficient was found to be 133.11 and 110.74 mg g−1 for MB and MG respectively. Adsorptions are best described by pseudo-second-order kinetics (kMB = 1.712, R2 = 0.999; kMG = 1.399, R2 = 0.999) and Langmuir isotherm model (R2 = 0.999). Thermodynamic data suggests a spontaneous (ΔG, −14 kJ mol−1) and feasible process. Spent material could be regenerated by using 0.5 M HCl. Up to 50% retention of activities was seen after five cycles. It can be concluded that alkali-activated coconut fiber is an economic and sustainable choice for dye removal.

Novelty statement: Spent coconut was converted into an effective biosorbent by simple alkali activation under ambient conditions to increase the hydrophobicity of the fibers by reducing the lignocellulosic components. Two cationic dyes; methylene blue and malachite green have been efficiently removed with adsorption capacities of 133.11 and 110.74 mg g−1. The operation is simple, economically viable, and partially fulfills the principles of green engineering. Comparing with contemporary adsorbents, this material offers higher adsorption capacities with multi-cycle reusability and enhanced water stability.



中文翻译:

椰子纤维的碱辅助疏水增强以增强阳离子染料的去除:平衡、动力学和热力学洞察

摘要

本研究表明,使用碱活化椰子纤维 (ACF) 作为吸附剂,可以增强从水中去除亚甲蓝 (MB) 和孔雀石绿 (MG) 的能力。碱活化有效地减少了存在于可可纤维中的木质纤维素成分,这反过来增强了可可纤维以变得更加水稳定。该材料通过 FTIR、SEM-EDS、BET、XRD 和 pH ZPC 进行表征。发现BET表面积为10.901 m 2 g -1,而材料的pH ZPC为6.05。FESEM 图像显示棒状形态。针对接触时间(0-120 分钟)、温度(288-308 K)、pH(3-10)、剂量(1-5 g)和输入染料浓度(10-50 mg L -1)。MB和MG的最大吸附系数分别为133.11和110.74 mg g -1。吸附最好通过伪二级动力学(k MB = 1.712,R 2 = 0.999;k MG = 1.399,R 2 = 0.999)和朗缪尔等温线模型(R 2 = 0.999)来描述。热力学数据表明自发 (Δ G , -14 kJ mol -1) 和可行的过程。用过的材料可以通过使用 0.5 M HCl 进行再生。五个周期后,活动的保留率高达 50%。可以得出结论,碱活化椰子纤维是去除染料的经济且可持续的选择。

新颖性声明:废椰子在环境条件下通过简单的碱活化转化为有效的生物吸附剂,通过减少木质纤维素成分来增加纤维的疏水性。两种阳离子染料;亚甲基蓝和孔雀石绿已被有效去除,吸附容量分别为 133.11 和 110.74 mg g -1。操作简单,经济可行,部分符合绿色工程的原则。与现代吸附剂相比,这种材料具有更高的吸附能力、多循环可重复使用性和增强的水稳定性。

更新日期:2021-04-04
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