Agha Hasan M, Jawad Ali H, ALOthman Zeid A, Wilson Lee D
Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia; Advanced Biomaterials and Carbon Development Research Group, Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia.
Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia; Advanced Biomaterials and Carbon Development Research Group, Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia; Environmental and Atmospheric Sciences Research Group, Scientific Research Center, Al-Ayen University, Thi-Qar, Nasiriyah 64001, Iraq.
Int J Biol Macromol. 2025 Aug;319(Pt 1):145208. doi: 10.1016/j.ijbiomac.2025.145208. Epub 2025 Jun 16.
Herein, chitosan (CHS) biopolymer was modified with walnut shell (WS) powder by loading different ratios (25 % and 50 %) of WS into the polymeric matrix of CHS to yield a promising bio-adsorbent for cationic methyl violet 2B (MV 2B) dye removal. The best loading ratio of the WS into the polymeric matrix of CHS was found to be 50 % CHS and 50 % WS (CHS/WS-(50:50)). A statistical optimization using Box-Behnken design (BBD) was applied to optimize the influence of three processing variables namely CHS/WS-(50:50) dose (0.02-0.1 g/100 mL), solution pH (4-10), and contact time (10-60 min) on the removal of MV 2B dye. The findings from the equilibrium and kinetic studies suggest that the MV 2B dye is adsorbed onto CHS/WS-(50:50) through a multilayer process according to the Freundlich isotherm model and the pseudo second order (PSO) kinetic model. Thus, CHS/WS-(50:50) shows a maximum adsorption capacity (q) of 103.3 mg/g for MV 2B dye removal. The adsorption mechanism of MV 2B involves interactions such as electrostatic forces, n-π stacking, and H-bonding. Reusability study indicates that the CHS/WS-(50:50) could effectively adsorb MV 2B for five cycles. This work introduces CHS/WS-(50:50) as a preferable bio adsorbent for removing harmful cationic dyes from contaminated water.
在此，通过将不同比例（25%和50%）的核桃壳（WS）粉末负载到壳聚糖（CHS）聚合物基质中，对壳聚糖生物聚合物进行改性，以制备一种有前景的生物吸附剂，用于去除阳离子甲基紫2B（MV 2B）染料。结果发现，WS在CHS聚合物基质中的最佳负载比例为50% CHS和50% WS（CHS/WS-(50:50)）。采用Box-Behnken设计（BBD）进行统计优化，以优化三个工艺变量，即CHS/WS-(50:50)剂量（0.02 - 0.1 g/100 mL）、溶液pH值（4 - 10）和接触时间（10 - 60分钟）对MV 2B染料去除的影响。平衡和动力学研究结果表明，根据Freundlich等温线模型和伪二级（PSO）动力学模型，MV 2B染料通过多层过程吸附到CHS/WS-(50:50)上。因此，CHS/WS-(50:50)对MV 2B染料去除的最大吸附容量（q）为103.3 mg/g。MV 2B的吸附机制涉及静电力、n-π堆积和氢键等相互作用。可重复使用性研究表明，CHS/WS-(50:50)可以有效地吸附MV 2B达五个循环。这项工作介绍了CHS/WS-(50:50)作为一种从受污染水中去除有害阳离子染料的优选生物吸附剂。
