Babazad Zeinab, Kaveh Fariborz, Ebadi Mehdi, Mehrabian Ramin Zafar, Juibari Mohammad Habibi
Department of Chemistry, Faculty of Sciences, Gorgan Branch, Islamic Azad University, Gorgan, Iran.
Heliyon. 2021 Mar 31;7(3):e06631. doi: 10.1016/j.heliyon.2021.e06631. eCollection 2021 Mar.
The adsorption process using inexpensive adsorbents is one of the methods to remove contaminants from aqueous solutions. Biomass porous carbon based materials are among the most widely used adsorbents in this field. Rice husk is a bio-based adsorbent material for pollutant removal. In this study, the porous carbon material obtained from the rice husk was used for the adsorptive removal of lead (Pb) and arsenic (As) from aqueous solutions. Silica was removed from rice husk structure through the one-step reaction using PTFE. The morphological and crystallographic characteristics of the adsorbent surface were determined by scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The removal efficiency was investigated under different conditions of pH (3-9), contact time (3-90min), adsorbent amount (0.5-6 g/l) and initially adsorbed concentration (10-100 μg/l) by changing the parameters in the adsorption reactions. The Response Surface Method (RSM), a Box-Behnken design (BBD), was used to optimize adsorption of Lead and Arsenic by Rice husk. The removal efficiency was finally calculated using analysis of variance. According to the adsorption analysis results, the removal efficiency of Pb and As in aqueous solutions increased (up to 97%, 85% for Lead and Arsenic) under optimum conditions.
使用廉价吸附剂的吸附过程是从水溶液中去除污染物的方法之一。生物质多孔碳基材料是该领域中使用最广泛的吸附剂之一。稻壳是一种用于去除污染物的生物基吸附剂材料。在本研究中，从稻壳中获得的多孔碳材料用于从水溶液中吸附去除铅（Pb）和砷（As）。通过使用聚四氟乙烯（PTFE）的一步反应从稻壳结构中去除二氧化硅。通过扫描电子显微镜（SEM）和X射线衍射（XRD）技术测定吸附剂表面的形态和晶体学特征。通过改变吸附反应中的参数，在不同的pH值（3 - 9）、接触时间（3 - 90分钟）、吸附剂用量（0.5 - 6 g/l）和初始吸附浓度（10 - 100 μg/l）条件下研究去除效率。采用响应面法（RSM）中的Box - Behnken设计（BBD）对稻壳吸附铅和砷的过程进行优化。最后使用方差分析计算去除效率。根据吸附分析结果，在最佳条件下，水溶液中铅和砷的去除效率提高（铅和砷分别高达97%、85%）。
