The surface of pristine multiwalled carbon nanotubes (P-MWCNTs) was modified for enhanced adsorption of Cr(VI) using the stem bark extract of Anacardium occidentale as the modifier. The pristine and modified P-MWCNTs were characterized using the XRD, FESEM, Raman, FTIR, TGA and BET surface area analysis. The uptake of Cr(VI) onto Anacardium occidentale modifier-P-MWCNTs (AOMW) was optimized using experimental conditions such as the pH, contact time, adsorbent dosage, adsorbate temperature and initial Cr(VI) concentration. The results showed optimum removal of Cr(VI) ion at pH 2, 180 min and 0.025 g dosage. The thermodynamic studies showed that Cr(VI) adsorption onto the modified AOMW and MWCNTs was spontaneous, feasible and endothermic. The elimination of Cr(VI) was greatly enhanced by the modification step. P-MWCNTs and AOMW showed efficient regeneration and reuse for Cr(VI) uptake after five cycles. These results proved the viability of AOMW for efficient removal of Cr(VI) from polluted aqueous stream.

原始西方多壁碳纳米管（P- MWCNTs）的表面经过改性以增强对Cr（VI）的吸附，使用的是西洋参（Anacardium occidentale）的茎皮提取物作为改性剂。使用XRD，FESEM，拉曼光谱，FTIR，TGA和BET表面积分析对原始的和改性的P-MWCNT进行表征。西方拟南芥修饰剂P上对Cr（VI）的吸收-MWCNTs（AOMW）使用诸如pH，接触时间，吸附剂剂量，吸附物温度和初始Cr（VI）浓度等实验条件进行了优化。结果表明，在pH 2、180分钟和0.025 g的剂量下，Cr（VI）离子的最佳去除效果。热力学研究表明，Cr（VI）吸附到改性的AOMW和MWCNTs上是自发的，可行的并且是吸热的。通过改性步骤大大提高了Cr（VI）的消除。P -MWCNTs和AOMW在五个循环后显示出对铬（VI）吸收的有效再生和再利用。这些结果证明了AOMW用于从受污染的水流中有效去除Cr（VI）的可行性。