Department of Environmental Engineering, Imam Abdulrahman bin Faisal University, Dammam, 31982, Saudi Arabia.
School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, 14300, Nibong Tebal, Pulau Pinang, Malaysia; Solid Waste Management Cluster, Engineering Campus, Universiti Sains Malaysia, 14300, Nibong Tebal, Pulau Pinang, Malaysia.
Environ Res. 2022 Jun;209:112861. doi: 10.1016/j.envres.2022.112861. Epub 2022 Feb 7.
In this research work, a novel hybrid composite consisting of biochar (B), layered double hydroxide (CuFe) and chitosan (CS) (B-CuFe-CS) was produced using an ultrasonication-assisted co-precipitation method. The resultant composite was employed for adsorptive removal of Eriochrome black T (EBT) from water. Physicochemical characterization indicated that the B-CuFe-CS containing 10 wt % CS exhibited a heterogeneous structure with better crystallographic and textural characteristics. The B-CuFe-CS with abundant surface functionalities (-CO, -C-O, -OH, -NO and MMO), facilitates faster and enhanced removal of the EBT. The kinetic results showed better fitting to the pseudo-second order model, and equilibrium was achieved within 30 min. Equilibrium data was well explained by Langmuir and Redlich Peterson isotherm models (R > 0.98), indicating the EBT removal onto B-CuFe-CS followed monolayer adsorption. The maximum adsorption capacity was 806.4 mg/g, which was higher than pristine B-CuFe (476.19 mg/g) and many other adsorbents. The spectroscopic analysis (FTIR and XPS) and experimental results suggested that EBT adsorption is mainly governed by electrostatic, chemical and anion-exchange interactions. It is evident from these results that coupling B-CuFe composite with bio-filler (chitosan) resulted in an efficient bio-adsorbent to effectively purify dye-contaminated water streams.
在这项研究工作中，采用超声辅助共沉淀法制备了一种由生物炭（B）、层状双氢氧化物（CuFe）和壳聚糖（CS）组成的新型杂化复合材料（B-CuFe-CS）。该复合材料用于从水中吸附去除 EBT。物理化学特性表明，含有 10wt%CS 的 B-CuFe-CS 表现出具有更好结晶和结构特征的异质结构。B-CuFe-CS 具有丰富的表面官能团（-CO、-C-O、-OH、-NO 和 MMO），有利于更快和增强 EBT 的去除。动力学结果表明更符合伪二级模型，并且在 30 分钟内达到平衡。平衡数据很好地解释了 Langmuir 和 Redlich Peterson 等温线模型（R>0.98），表明 EBT 去除到 B-CuFe-CS 上遵循单层吸附。最大吸附容量为 806.4mg/g，高于原始 B-CuFe（476.19mg/g）和许多其他吸附剂。光谱分析（FTIR 和 XPS）和实验结果表明，EBT 吸附主要受静电、化学和阴离子交换相互作用的控制。从这些结果可以明显看出，将 B-CuFe 复合材料与生物填充剂（壳聚糖）结合使用，得到了一种高效的生物吸附剂，可有效净化受染料污染的水流。
