Dye wastewater treatment using lignin from durian rind (Durio zibethinus Rumph. ex Murray)
Tran Y Doan Trang, Lai Hong Dzung, Do Thi Cam Van, Ta Thi Huong, Nguyen Quang Tung, Thi-Dung Ha, Do Thi Hanh, Vu Phuong Lan
Section: Chemistry of natural environments and objects
The agricultural sector is generating increasing amounts of solid waste, leading to a growing trend of reusing or recycling these waste materials into valuable resources. This study evaluated the potential of lignin extracted from durian rind (DR) to remove methylene blue (MB) dye from wastewater. Lignin samples were characterized using Fourier transform infrared spectroscopy, optical microscopy, scanning electron microscopy, and thermal analysis. The impact of different factors, including pH, initial MB concentration, adsorbent dosage, and contact time, was evaluated in the batch adsorption experiments. The data showed that the maximum adsorption capacity of the lignin from DR occurred at pH of 5, with an adsorbent dosage of 10 g·L-1 and a contact time of 60 minutes. Kinetic studies showed that the adsorption process was well described by a pseudo-second-order kinetic model with a high adsorption capacity of 40.16 mg·g-1. Additionally, the adsorption isotherm results aligned well with the Langmuir equation, indicating monolayer adsorption on a homogeneous surface. The physical adsorption mechanism was proposed to involve electrostatic interactions, π interactions, and hydrogen bonding between the adsorbate and the adsorbent. In conclusion, this study highlights the potential for agricultural waste, such as durian rind, to be repurposed into effective adsorbent materials for treating dye contamination in water environments.
ISSN 1995-4301
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