Department of Chemistry, National Institute of Technology (NIT), Raipur, CG, 492010, India.
Department of Engineering Chemistry, Bhilai Institute of Technology, Bhilai House, Durg, CG, 491001, India.
Environ Sci Pollut Res Int. 2017 Aug;24(22):18410-18420. doi: 10.1007/s11356-017-9413-7. Epub 2017 Jun 22.
This study has been focused on the efficient removal of Pb (II) from contaminated waters by biosorption using plant derived material. Accordingly an indigenous shrub, Tinospora cordifolia has been identified as the most suitable biosorbent. The plant biomass was subjected to optimization of various parameters such as the pH, equilibrium time, dosage, concentration, temperature and the applicable adsorption models. The optimum pH identified was 4.0 with a contact time of 60 min at room temperature (27 ± 2 °C). The experimental data fitted well to adsorption isotherms and the uptake capacity of Pb (II) was found to be 20.83 and 63.77 mg/g in batch mode and column mode, respectively. The high correlation factors obtained for Langmuir and Freundlich models indicated that both models were obeyed by the system. Kinetic study for adsorption of Pb (II) follow only pseudo second order rate of reaction. The accumulation of lead in biomass was confirmed by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis. The FTIR analysis indicated the involvement of hydroxyl (-OH), alkenes (=CH) and carbonyl group (C = O) chelates in metal binding. The SEM and EDX analysis showed the structural changes and the filling of voids in the biomass thus, it indicated the metal-binding mechanism. In elution studies, the 0.1 M NaCO was found to be the best with about 71% elution of the adsorbed metal. The biomass was then used for the removal of Pb (II) in synthetic and real wastewater samples from a lead-acid battery industry. It is also noteworthy that even at a very high concentration of 450 mg/L, the biomass was showing about 92% removal. The result is to establish the efficacy of T. cordifolia as a very good bioadsorbent for the Pb (II) removal from contaminated water.
本研究专注于利用植物衍生材料通过生物吸附从受污染的水中有效去除 Pb(II)。相应地，已经鉴定出本地灌木三叶鬼针草（Tinospora cordifolia）是最合适的生物吸附剂。对植物生物质进行了各种参数的优化，例如 pH 值、平衡时间、剂量、浓度、温度和适用的吸附模型。确定的最佳 pH 值为 4.0，在室温（27 ± 2°C）下接触时间为 60 分钟。实验数据很好地符合吸附等温线，并且在批处理模式和柱模式下，Pb(II)的吸附容量分别为 20.83 和 63.77 mg/g。朗格缪尔（Langmuir）和弗伦德利希（Freundlich）模型获得的高相关系数表明，该系统均遵循两种模型。吸附 Pb(II)的动力学研究仅遵循伪二级反应速率。傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）和能量色散 X 射线（EDX）分析证实了生物量中铅的积累。FTIR 分析表明，金属结合涉及羟基（-OH）、烯烃（=CH）和羰基（C=O）螯合物。SEM 和 EDX 分析表明，生物质的结构发生了变化，空隙被填满，因此表明了金属结合机制。在洗脱研究中，发现 0.1 M NaCO 是最佳的洗脱剂，可洗脱约 71%的吸附金属。然后将生物质用于去除来自铅酸电池行业的合成和实际废水样品中的 Pb(II)。值得注意的是，即使在非常高的 450 mg/L 浓度下，生物质仍显示出约 92%的去除率。该结果证明了三叶鬼针草作为一种非常好的生物吸附剂，可有效去除受污染水中的 Pb(II)。
