Chromium (VI) is recognized as a highly toxic contaminant metal ion, due to its potential toxic effect to human and animal health. From the most common processes applied for Cr (VI) ions removal is the sorption process hence it has been highly efficient and inexpensive technique. In the present work, a bio-synthesized Ag/ZnO nanocomposite loaded on activated carbon as a new eco-friendly and effective sorbent for the removal of Cr (VI) ions. The modification of activated carbon confirmed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The optimum conditions for the uptake of Cr(VI) ions by Ag/ZnO-AC was found to be at pH 2.5, shaking time 60 h, Cr (VI) ions concentration of 40 ppm, and 0.4 g sorbent dose. The results indicated that sorption process optimally correlated with Freundlich isotherm and pseudo second order kinetic models. The values of ΔG° are negative at all studied temperatures (-0.55, -1.18, -2.43, -3.68, -4.93 and -7.43 kJ. mol⁻¹) suggesting that the sorption process is spontaneous. The positive values of ΔH° (36.7 kJ. mol⁻¹) and ΔS° (0.125 kJ. mol⁻¹) indicate the endothermic and physisorption nature of the sorption process. The results demonstrated that Ag/ZnO-AC can be used as a potential sorbent for the uptake of Cr (VI) ions.

铬（VI）由于其对人类和动物健康的潜在毒性作用，被认为是剧毒的金属污染物。吸附过程是最常用的去除Cr（VI）离子的过程，因此它是一种高效且廉价的技术。在目前的工作中，负载在活性炭上的生物合成的Ag / ZnO纳米复合材料是一种新型的环保，有效的吸附剂，用于去除Cr（VI）离子。通过扫描电子显微镜（SEM）和X射线衍射（XRD）证实了活性炭的改性。发现Ag / ZnO-AC吸收Cr（VI）离子的最佳条件为pH 2.5，振荡时间60 h，Cr（VI）离子浓度为40 ppm和0.4 g吸附剂剂量。结果表明，吸附过程与Freundlich等温线和伪二级动力学模型最佳相关。在所有研究温度下（-0.55，-1.18，-2.43，-3.68，-4.93和-7.43 kJ.mol^-1）表明吸附过程是自发的。ΔH的正值°（36.7千焦。摩尔^-1）和ΔS°（0.125千焦。摩尔^-1）表示吸附过程的吸热吸附和物理吸附的性质。结果表明，Ag / ZnO-AC可用作吸收Cr（VI）离子的潜在吸附剂。