Herein, adsorption process based on a new adsorbent was utilized to remove nickel ion, an environmental pollutant, from water. To fabricate the adsorbent, multi wall carbon nanotubes (MWCNTs) were functionalized using a deep eutectic solvent (DES) based on tetra-n-butyl-ammonium-bromide. Adsorbent efficiency evaluation and optimizing the conditions of the adsorption process were performed by D-optimal design method. Maximum adsorption capacity of 115.8 mg.g⁻¹ and maximum removal rate of 93% were obtained by adsorbent dosage of 0.011 g for 68 min contact time in pH = 7.21 and 55 °C as optimum conditions. Good behavior of the adsorbent in nickel removal can be due to the enhanced electrostatic forces and chemical interaction between nickel ions and the adsorbent by higher functionalized MWCNTs' hydrophilicity. Experimental data from adsorption indicated proper matching with the sips isotherm and pseudo-second-order kinetic. Moreover, adsorbent reusability of about 7 times showed its satisfactory performance in nickel removing.

在本文中，基于新吸附剂的吸附过程用于从水中去除环境污染物镍离子。为了制备吸附剂，使用基于四正丁基溴化铵的深共熔溶剂（DES）对多壁碳纳米管（MWCNT）进行功能化。通过D优化设计方法进行吸附剂效率评估和优化吸附过程的条件。最大吸附量为115.8 mg.g ^-1在最佳条件下，在pH = 7.21和55°C的条件下，吸附剂剂量为0.011 g，接触时间为68 min时，最大去除率为93％。吸附剂的良好脱镍性能可能归因于较高官能化的MWCNT的亲水性增强了镍离子与吸附剂之间的静电力和化学相互作用。来自吸附的实验数据表明与饮水等温线和拟二级动力学适当匹配。此外，吸附剂的可重复使用性约为7倍，显示出令人满意的除镍性能。