Department of Textile Engineering, Dhaka University of Engineering & Technology, Gazipur, 1707, Bangladesh.
Department of Textile Engineering, Dhaka University of Engineering & Technology, Gazipur, 1707, Bangladesh.
J Environ Manage. 2021 Dec 15;300:113782. doi: 10.1016/j.jenvman.2021.113782. Epub 2021 Sep 22.
In this study, naturally abundant and inexpensive bamboo was used to make cheaper activated charcoal for efficient encapsulation of toxic copper (Cu(II)) ion from wastewater. The functionalized bamboo charcoal-Layered double hydroxides (BC-LDHs) composite bio-adsorbent was prepared using co-precipitation method. The composite bio-adsorbent was exploited to eliminate Cu(II) ion with high sensitivity and selectivity from contaminated water. The adsorption parameters including the effect of pH, contact time, adsorbent dose, and effect of initial concentration were optimized in systematic way and the adsorption kinetics and isotherms were investigated for potential use in real sample treatment. The physicochemical properties and morphological structure of the adsorbent were examined using X-ray Diffraction, Scanning Electronic Microscopy, Fourier Transform Infrared Spectroscopy and Thermogravimetric Analysis to understand the Cu(II) ion adsorption mechanism. The adsorption results revealed that the BC-LDH could remove almost 100% of Cu(II) ion from aqueous solution at pH range between 3.0 and 6.0 within 30 min. The maximum monolayer adsorption capacity was determined to be 85.47 mg/g based on the Langmuir isotherm. The adsorption equilibrium data were well-fitted by the Langmuir isotherm model (R = 0.998) and the experimental kinetic data were supported by the pseudo-second order model (R = 0.999). The BC-LDH could be reused without losing its adsorption performance in several cycles after successful regeneration with 0.10 M HCl. The Cu(II) ion removal mechanism was postulated with intercalated ion exchange, surface precipitation and interaction between BC-LDH and surface functionalities. Therefore, the highly functional BC-LDH composite could be a promising adsorbent for efficient Cu(II) ion removal from wastewater.
在这项研究中，我们使用天然丰富且廉价的竹子来制造更便宜的活性炭，以便从废水中高效封装毒性较大的铜（Cu(II)）离子。通过共沉淀法制备了功能化竹基活性炭-层状双氢氧化物（BC-LDHs）复合生物吸附剂。该复合生物吸附剂被用于从受污染的水中高灵敏度和选择性地去除 Cu(II)离子。通过系统优化吸附参数（包括 pH 值、接触时间、吸附剂剂量和初始浓度的影响），研究了吸附动力学和等温线，以评估其在实际样品处理中的应用潜力。通过 X 射线衍射、扫描电子显微镜、傅里叶变换红外光谱和热重分析来研究吸附剂的物理化学性质和形貌结构，以了解 Cu(II)离子的吸附机制。吸附结果表明，BC-LDH 在 pH 值为 3.0 至 6.0 之间的范围内，可在 30 分钟内几乎完全去除水溶液中的 Cu(II)离子。根据 Langmuir 等温线，最大单层吸附容量为 85.47 mg/g。吸附平衡数据与 Langmuir 等温线模型（R=0.998）拟合良好，实验动力学数据与准二级模型（R=0.999）相符。BC-LDH 在成功用 0.10 M HCl 再生后，可在几个循环中重复使用而不会失去其吸附性能。Cu(II)离子去除机制被推测为插层离子交换、表面沉淀和 BC-LDH 与表面官能团之间的相互作用。因此，具有高功能的 BC-LDH 复合材料可能是一种很有前途的从废水中高效去除 Cu(II)离子的吸附剂。
