焦化水葫芦作为生物吸附剂去除水溶液中Ca(II)离子的研究

Arun Bhujel, K. Wagle, B. Regmi, Bibek Sapkota, B. R. Poudel, S. K. Gautam
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引用次数: 1

摘要

通过对焦化水葫芦进行热处理,再用酸化氯化锌(ZnCl2)进行化学活化,探索了焦化水葫芦(CWH)对水中Ca(II)的脱除效果。采用扫描电镜(SEM)和电子色散x射线(EDX)光谱对吸附剂进行了表征。采用间歇吸附技术对Ca(II)进行吸附,考察吸附等温线、pH、接触时间、初始Ca(II)浓度、吸附剂剂量和吸附动力学的影响。SEM显微图显示了粗糙和不规则的表面形貌,EDX光谱证实了Ca(II)在吸附剂表面的成功吸附。平衡吸附数据更符合Freundlich等温模型,最大吸附量(qmax)为319.75 mg/g。pH为1.5时吸附率最高。金属浓度越高,吸附剂剂量越小,CWH对Ca(II)的吸附越弱。CWH对Ca(II)离子的吸附符合准二级动力学模型。总之,这些结果表明,所制备的CWH可以作为一种环保、经济、高效的去除水溶液中Ca(II)的替代品。
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Utilization of Charred Water Hyacinth (Jalkumvi) as Biosorbent for Removal of Ca(II) Ion from Aqueous Solution
A promising adsorbent, charred water hyacinth (CWH) for the removal of Ca(II) from the aqueous solution was explored by heat treatment of water hyacinth followed by chemical activation with acidified zinc chloride (ZnCl2). The adsorbent was characterized using scanning electron microscopy (SEM) and electron dispersive X-ray (EDX) spectroscopy. Batch adsorption techniques were conducted for Ca(II) adsorption to assess the adsorption isotherm, effect of pH, contact time, initial Ca(II) concentration, adsorbent doses, and adsorption kinetics. The SEM micrograph illustrates the rough and irregular surface morphology and EDX spectra confirm the successful adsorption of Ca(II) on the adsorbent surface. The equilibrium adsorption data better fitted to the Freundlich isotherm model having a maximum adsorption capacity (qmax) of 319.75 mg/g. The highest percentage of adsorption was found at pH 1.5. The adsorption of Ca(II) by CWH decreased at the higher metal concentration and lower adsorbent doses. The adsorption of Ca(II) ions onto CWH followed the pseudosecond-order kinetics model. Overall, these results suggested that the as-prepared CWH can be used as an ecofriendly, economical and efficient alternative for the removal of Ca(II) from the aqueous solution.
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