Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India; Department of Applied Chemistry, University of Johannesburg, Johannesburg, South Africa.
Institute Instrumentation Centre, Indian Institute of Technology Roorkee, Roorkee 247667, India.
J Colloid Interface Sci. 2016 Sep 15;478:54-62. doi: 10.1016/j.jcis.2016.05.064. Epub 2016 May 30.
Copper(II) oxide nanoparticles were synthesized at low temperature using cold finger assisted magnetron sputtering technique and were applied as adsorbent for the rapid removal of noxious Cr(VI) ions from the solvent phase. The average size of CuO nanoparticles from TEM analysis was found to be 8nm in addition to this the BET surface area (84.327m(2)/g) was found to be significantly high in comparison to the previously CuO nanoparticles synthesized via green route. The synthesized CuO nanoparticles is crystalline in nature and exhibits monoclinic phase, which was confirmed using various analytical techniques such as SAED, XRD and Raman analysis. The impact of influential parameters including pH, adsorbent dose, contact time, stirring speed, initial Cr(VI) ions concentration, and temperature were optimized using batch adsorption method in order to obtain maximum removal of Cr(VI) ions. From the thermodynamic parameters, the positive value of enthalpy (ΔH) and negative value of Gibbs free energy (ΔG) indicate the endothermic and spontaneous nature of Cr(VI) ions adsorption, respectively. The adsorption kinetics data was well fitted and found to be in good agreement with the pseudo second order kinetic behaviour.
采用冷指辅助磁控溅射技术在低温下合成了氧化铜纳米粒子，并将其用作吸附剂，从溶剂相中快速去除有害的六价铬离子。TEM 分析发现氧化铜纳米粒子的平均粒径为 8nm，此外，与之前通过绿色路线合成的氧化铜纳米粒子相比，BET 表面积（84.327m2/g）显著较高。合成的氧化铜纳米粒子为晶态，表现出单斜相，这通过各种分析技术如 SAED、XRD 和拉曼分析得到了证实。采用批量吸附法优化了包括 pH 值、吸附剂剂量、接触时间、搅拌速度、初始六价铬离子浓度和温度在内的影响参数，以获得最大的六价铬离子去除率。从热力学参数来看，焓（ΔH）的正值和吉布斯自由能（ΔG）的负值分别表明六价铬离子吸附是吸热和自发的。吸附动力学数据拟合良好，与准二级动力学行为吻合较好。
