Kaur Mandeep, Kumari Santosh, Sharma Praveen
Department of Environmental Science & Engineering, Guru Jambheshwar University of Science & Technology, Hisar 125001, Haryana, India.
Department of Bio & Nano Technology, Guru Jambheshwar University of Science & Technology, Hisar 125001, Haryana, India.
Biotechnol Rep (Amst). 2019 Dec 6;25:e00410. doi: 10.1016/j.btre.2019.e00410. eCollection 2020 Mar.
This research focus on the removal of Pb (II) ions from aqueous solution by adsorption process using nanoadsorbent developed from agricultural waste husk (OSH). Surface morphology of nanoadsorbent was analyzed by FE-SEM, elemental composition by EDX and size by AFM. Attachment of functional groups on nanoadsorbent was determined by FTIR. The effect of pH, dose, contact time, initial concentration and temperature were investigated. Optimum adsorption of lead at pH 8, contact time 70 min at 60 °C temperature with 0.6 g/50 mL nanoadsorbent dose obeyed pseudo second order kinetic model with R 0.996. Pb (II) adsorption was analyzed by Freundlich, Langmuir and Temkin models. Freundlich isotherm model with correlation coefficient R 0.999 was best fitted. Thermodynamic parameters anticipated the adsorption process to be endothermic and spontaneous. Post adsorption elution was carried out successfully. Results demonstrate that OSH is a low cost and eco-friendly choice for Pb (II) remediation.
本研究聚焦于利用由农业废弃物稻壳（OSH）制备的纳米吸附剂，通过吸附过程从水溶液中去除Pb（II）离子。采用场发射扫描电子显微镜（FE-SEM）分析纳米吸附剂的表面形态，利用能谱仪（EDX）分析元素组成，通过原子力显微镜（AFM）测定粒径。采用傅里叶变换红外光谱仪（FTIR）确定纳米吸附剂上官能团的附着情况。研究了pH值、剂量、接触时间、初始浓度和温度的影响。在pH值为8、温度为60°C、接触时间为70分钟、纳米吸附剂剂量为0.6 g/50 mL的条件下，铅的最佳吸附符合伪二级动力学模型，相关系数R为0.996。采用弗伦德利希（Freundlich）、朗缪尔（Langmuir）和坦金（Temkin）模型对Pb（II）的吸附进行分析。相关系数R为0.999的弗伦德利希等温线模型拟合效果最佳。热力学参数表明吸附过程是吸热且自发的。成功进行了吸附后洗脱。结果表明，OSH是用于Pb（II）修复的低成本且环保的选择。
