Khobragade Moni U, Pal Anjali
a Department of Civil Engineering, Indian Institute of Technology , Kharagpur , India.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2015;50(4):385-95. doi: 10.1080/10934529.2015.987535.
Batch adsorption was carried out to investigate the possibility of utilizing surfactant-modified alumina (SMA) as an adsorbent for the removal of Cu(II) and Ni(II) from single-metal and binary-metal solutions. Scanning electron microscopic (SEM) images of SMA before and after metal removal from single-metal matrix, showed no significant changes, whereas energy dispersive X-ray (EDX) studies confirmed the incorporation of Cu(II) (∼ 0.74 atomic%) and Ni(II) (∼ 0.64 atomic%) on the adsorbent surface. The removal of Cu(II) and Ni(II), using SMA depends on contact time, adsorbent dose and medium pH. The sorption kinetics followed pseudo-second-order model for Cu(II). However, for Ni(II), either pseudo-first-order or pseudo-second-order model is applicable. The batch experimental data were fitted to Langmuir and Freundlich isotherm, and based on the correlation coefficient value (R(2)), the adsorption could be described more precisely by the Freundlich isotherm. The maximum adsorption capacity from Langmuir isotherm of Cu(II) was 9.34 mg g(-1) and for Ni(II) 6.87 mg g(-1). In a synthetic binary mixture of Cu(II) and Ni(II), having a concentration of 10 mg L(-1) each, removal of Cu(II) was better. The treatment method was further applied to real wastewater from an electroplating industry. The batch experiment results showed that SMA was effective in the simultaneous removal of Cu(II) and Ni(II) to a significant extent, with additional improvement of water quality of the industrial effluent considered.
进行了批量吸附实验，以研究利用表面活性剂改性氧化铝（SMA）作为吸附剂从单金属和双金属溶液中去除铜（II）和镍（II）的可能性。从单金属基质中去除金属前后SMA的扫描电子显微镜（SEM）图像显示没有显著变化，而能量色散X射线（EDX）研究证实铜（II）（约0.74原子%）和镍（II）（约0.64原子%）已结合在吸附剂表面。使用SMA去除铜（II）和镍（II）取决于接触时间、吸附剂剂量和介质pH值。铜（II）的吸附动力学遵循准二级模型。然而，对于镍（II），准一级或准二级模型均适用。批量实验数据拟合到朗缪尔和弗伦德利希等温线，基于相关系数值（R²），弗伦德利希等温线能更精确地描述吸附过程。朗缪尔等温线得出铜（II）的最大吸附容量为9.34 mg g⁻¹，镍（II）为6.87 mg g⁻¹。在浓度均为10 mg L⁻¹的铜（II）和镍（II）合成二元混合物中，铜（II）的去除效果更好。该处理方法进一步应用于电镀行业的实际废水。批量实验结果表明，SMA在很大程度上能有效同时去除铜（II）和镍（II），考虑到工业废水水质也有额外改善。
