Aluminium oxide modified onion skin waste (Al₂O₃/OSW) was characterized and used for adsorption of metal ions (Pb²⁺ and Cd²⁺) in this study, and the relations between sorbent properties and metal ion sorption were investigated. The effects of adsorption process conditions on metal ion removal efficiency, including initial cation concentration, contact time, adsorbent dosage and pH, were examined. The obtained adsorption data were analyzed by various adsorption isotherm and kinetic models. It was found that the optimum values of the initial concentration, contact time, adsorbent dosage and pH were 10 mg/L, 120 min, 1.6 g/L and 6.0, respectively. At these optimum conditions, maximum removal percentages of Pb²⁺ and Cd²⁺ were 91.23 and 94.10%, respectively. The isotherm and kinetic studies showed a multilayer adsorbate-adsorbent system with the dominance of the chemisorption mechanism. The study concluded that onion skin waste is a viable, cheap and effective alternative for removing heavy metal ions from water/wastewater.

表征了氧化铝改性洋葱皮废料（Al ₂ O ₃ / OSW）并用于吸附金属离子（Pb ²⁺和Cd ²⁺），并研究了吸附性能与金属离子吸附之间的关系。考察了吸附工艺条件对金属离子去除效率的影响，包括初始阳离子浓度，接触时间，吸附剂用量和pH值。通过各种吸附等温线和动力学模型分析获得的吸附数据。发现初始浓度，接触时间，吸附剂剂量和pH的最佳值分别为10 mg / L，120 min，1.6 g / L和6.0。在这些最佳条件下，Pb ^2+的最大去除百分比和Cd ²⁺分别为91.23％和94.10％。等温和动力学研究表明，多层吸附物-吸附剂系统具有化学吸附机理的优势。研究得出的结论是，洋葱皮废物是从水/废水中去除重金属离子的可行，廉价且有效的替代方法。