Abstract：
In this study, pomegranate seed waste (PSW) was added into sand filter (SF) to increase removal efficiency of Lead (Pb(II)) and Copper (Cu(II)) from polluted water. The performance of PSW was compared with activated carbon (AC) as a typical adsorbent. Based on the SEM, EDX, FTIR, XRD, BET and proximate analyses, PSW had porous structure with specific surface area of 2.76 m2/g and active compounds which suggested PSW as an appropriate adsorbent for heavy metals (HMs) adsorption. According to the batch experiments, SF without treatment could only remove 46% and 35% of Pb(II) and Cu(II), respectively. These numbers increased to 88% and 75% for Pb(II) and Cu(II) by adding 3 g/kg PSW to the SF, respectively under the optimal conditions of HMs initial concentrations = 100 mg/L, pH = 7 and contact time = 60 min. The adsorption kinetic and isotherm followed the pseudo-first-order and Langmuir models, respectively indicating that mainly physisorption was involved in the HMs adsorption process of PSW. Based on the column experiments (flow rate = 62.5 mL/min), the Pb(II) and Cu(II) removal increased from 14% to 60% and 10%-55%, respectively after 5 pore volumes (40 min) by adding 3 g/kg PSW to the SF. Breakthrough curves matched better with Thomas mode rather than Adam\'s Bohart proving Langmuir adsorption isotherm. Our finding suggested modification of SF with PSW is a promising approach for efficient removal of HMs from water.
摘要：
在这项研究中,将石榴种子废物（PSW）添加到砂滤器（SF）中，以提高从污染水中去除铅（Pb（II））和铜（Cu（II））的效率。将PSW的性能与作为典型吸附剂的活性炭（AC）进行了比较。基于SEM,EDX,FTIR,XRD,BET和近似分析，PSW具有多孔结构，比表面积为2.76m2/g，活性化合物表明PSW是重金属（HM）吸附的合适吸附剂。根据批量实验,未经处理的SF只能去除46%和35%的Pb(II)和Cu(II)，分别。通过向SF中添加3g/kgPSW，这些数字增加到Pb（II）和Cu（II）的88％和75％，分别在HMs初始浓度=100mg/L的最佳条件下，pH=7,接触时间=60min。吸附动力学和等温线遵循伪一级和Langmuir模型，分别表明PSW的HMs吸附过程主要涉及物理吸附。基于柱实验（流速=62.5mL/min），Pb(II)和Cu(II)去除率从14%提高到60%，10%提高到55%，分别在5孔体积（40分钟）后，向SF中添加3g/kgPSW。突破曲线与托马斯模式匹配得更好，而不是亚当的Bohart，证明了朗缪尔吸附等温线。我们的发现建议用PSW修饰SF是一种有效去除水中HM的有前途的方法。
