响应面法探究花生壳炭吸附水中镍离子的最优改性条件

响应面法探究花生壳炭吸附水中镍离子的最优改性条件Title: Optimization of Modified Conditions for the Adsorption of Nickel Ions

响应面法探究花生壳炭吸附水中镍离子的最优改性条件 Title: Optimization of Modified Conditions for the Adsorption of Nickel Ions from Water Using Peanut Shell Charcoal by Response Surface Methodology Abstract: Water pollution caused by heavy metal ions has become aglobal concern. The removal of nickel ions from water using adsorbents has gained significant attention due to its wide application in various industrial processes. Peanut shell charcoal (PSC) has shown promising potential as an adsorbent for the removal of nickel ions from water. In this study, response surface methodology (RSM) was employed to optimize the modification conditions of PSC for the adsorption of nickel ions. The effects of pH, adsorbent dose, and contact time on the adsorption efficiency were investigated. The results indicated that the optimal modification conditions for PSC were apH of 7.2, an adsorbent dose of 0.5 g, and acontact time of 90 minutes. Under these conditions, the maximum adsorption efficiency of nickel ions reached 92.3%. The modified PSC exhibited improved adsorption capacity and can be considered as areliable and cost-effective adsorbent for the removal of nickel ions from water. 1. Introduction: Water pollution caused by heavy metal ions, such as nickel, poses agreat threat to ecosystems and human health. Therefore, the development of effective techniques for the removal of nickel ions from water has become aresearch focus. Adsorption is widely used as an efficient method for removing heavy metal ions from water due to its simplicity, low cost, and high efficiency. Various adsorbents, such as activated carbon, zeolites, and agricultural waste-based materials, have been studied for the removal of nickel ions. Among these adsorbents, peanut shell charcoal (PSC) has shown great potential due to its abundant availability, low cost, and high surface area. 2. Materials and Methods: 2.1 Materials: Peanut shells were collected from local agricultural farms and subjected to washing, drying, and grinding processes to obtain PSC. Nickel nitrate (Ni(NO3)2) was used to prepare the nickel ion solution for the adsorption experiments. 2.2 Modification of PSC: The modification of PSC was conducted by adjusting the pH of the solution, varying the adsorbent dose, and controlling the contact time. Response surface methodology (RSM) was employed to optimize the modification conditions. 2.3 Adsorption Experiments: Batch adsorption experiments were performed by adding apredetermined amount of modified PSC to nickel ion solutions of varying concentrations. The solutions were shaken for aspecific contact time, and the residual nickel ion concentration was