In this study, stems of Argemone maxicana (AM) were used to produce biochar for Zn(II) ion adsorption from aqueous solution in a batch experiment mode. The AM biochar was characterized using Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy-Energy-dispersive X-ray (SEM-EDX), and X-ray diffraction (XRD) in order to use as an adsorbent. The effect of parameters such as adsorbent dosage, contact time, pH of the solution, initial concentration of Zn(II) ion in aqueous solution, and temperature on the removal efficiency of Zn(II) ion was investigated. The results of batch experiments showed that the percentage removal of Zn(II) ion increases as pH increases from 2.10 to 6.12. The results of contact time experiments revealed that removal efficiency increases and reached equilibrium at 110 min after which no more adsorption takes place. Percentage removal increases with adsorbent dosage. Initially the concentration of Zn(II) ion was varied from 10 to 50 mg/L, and the highest percentage removal was obtained at 10 mg/L. Langmuir and Freundlich isotherms have been used to examine the experimental results. Kinetic analysis was carried using pseudo-first-order and pseudo-second-order kinetic models. The thermodynamic study indicated that the process is spontaneous and exothermic.

在这项研究中，最大的Argemone的茎（AM）用于以批处理实验方式从水溶液中生产用于吸附Zn（II）离子的生物炭。为了用作吸附剂，使用傅里叶变换红外（FTIR）光谱，扫描电子显微镜-能量分散X射线（SEM-EDX）和X射线衍射（XRD）对AM生物炭进行了表征。研究了吸附剂量，接触时间，溶液的pH，水溶液中Zn（II）离子的初始浓度和温度等参数对Zn（II）离子去除效率的影响。批处理实验的结果表明，随着pH从2.10增至6.12，Zn（II）离子的去除百分数增加。接触时间实验的结果表明，去除效率提高，并在110分钟达到平衡，此后不再发生吸附。去除率随吸附剂剂量的增加而增加。最初，Zn（II）离子的浓度从10到50 mg / L不等，在10 mg / L时去除率最高。Langmuir和Freundlich等温线已用于检验实验结果。使用伪一级动力学模型和伪二级动力学模型进行动力学分析。热力学研究表明该过程是自发的并且放热的。