Abstract

This study established the efficiency of a fixed bed column in the removal of Ni (II) and Cu (II) ions from an industrial paint effluent. The kola nut pod was characterized to identify functional groups, morphology, and porosity nature of the adsorbent. The appearance and shifts of some peaks in the Fourier transform infrared (FTIR) spectra revealed amide, carboxyl, and hydroxyl groups. The scanning electron microscopy (SEM) analysis revealed a non-cellulosic morphology with clear pore structure; the BET analysis gave a surface area and pore volume values of 225.0 m²/g and 0.03949 cm³/g, respectively. Surface area and pore volume of the loaded adsorbent decreased by 37.87 and 98.66%, respectively. Deposition and coverage of adsorptive sites were observed on the loaded adsorbent from the SEM results. Raw effluent from paint production industry was analyzed using the atomic absorption spectrophotometer (AAS). Results obtained indicated the presence of Ni(II) and Cu(II) at concentrations of 5.3747 mg/L and 35.6636 mg/L, respectively, among other heavy metals. Optimum values for an efficient column parametric study were obtained at a bed height of 10.0 cm, flow rate of 5.0 mL/min and at their respective initial concentrations. The percentage removal for Ni(II) and Cu(II) ions were 29.35 and 93.9%, respectively, with corresponding adsorption capacity of 12.841 and 6.100 mg/g. The range of values of the error functions obtained from the analysis on Thomas model for adsorption of both copper and nickel ions are SSE values range 0.0053–0.0928 and 0.0044–0.7491, HYBRID values of 0.0143–1.0999 and 0.0057–9.7006, MPSD values of 0.5193–5.4680 and 0.2260–30.0215 and R² values of 0.2720–0.8027 and 0.0008–0.5866, respectively. The kinetic isotherms revealed that the Thomas gave the lowest error between calculated and experimental values, coefficient of determination and thus can be used in describing the behavior of the adsorption process.

摘要

本研究确定了固定床柱从工业油漆流出物中去除 Ni (II) 和 Cu (II) 离子的效率。对可乐果荚进行表征以识别吸附剂的官能团、形态和孔隙率。傅里叶变换红外 (FTIR) 光谱中某些峰的出现和位移揭示了酰胺、羧基和羟基。扫描电子显微镜 (SEM) 分析显示具有清晰孔结构的非纤维素形态；BET 分析得出的表面积和孔体积值为 225.0 m ² /g 和 0.03949 cm ³/g，分别。负载的吸附剂的表面积和孔体积分别减少了 37.87% 和 98.66%。从 SEM 结果观察到负载吸附剂上的吸附位点的沉积和覆盖。使用原子吸收分光光度计 (AAS) 分析涂料生产行业的原始废水。获得的结果表明，除其他重金属外，Ni(II) 和 Cu(II) 的浓度分别为 5.3747 毫克/升和 35.6636 毫克/升。有效色谱柱参数研究的最佳值是在 10.0 cm 的床高、5.0 mL/min 的流速和它们各自的初始浓度下获得的。Ni(II) 和 Cu(II) 离子的去除百分比分别为 29.35% 和 93.9%，相应的吸附容量分别为 12.841 和 6.100 mg/g。R ²值分别为 0.2720–0.8027 和 0.0008–0.5866。动力学等温线表明，托马斯给出了计算值和实验值之间的最低误差、决定系数，因此可用于描述吸附过程的行为。