首页|聚乙烯亚胺改性稻壳的制备及吸附性能研究

聚乙烯亚胺改性稻壳的制备及吸附性能研究

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稻壳是稻谷脱壳后的副产物，是一种产量巨大的农业废弃物资源。但是，目前这种可再生资源并没有得到高效利用，从而造成了自然资源的极大浪费。因此，利用价格低廉的稻壳制备具有高附加值的高效吸附材料，有着不容小觑的实际意义。该文以稻壳为原料，通过简单的交联反应将聚乙烯亚胺成功接枝到稻壳表面，制备了一种对Cr(Ⅵ)具有良好吸附性能的生物质吸附剂。研究结果表明，改性稻壳吸附Cr(Ⅵ)的最佳条件为:温度60℃，pH=2。在最佳吸附条件下，改性稻壳对Cr(Ⅵ)的最大吸附量达到113。76mg/g。吸附等模型和吸附动力学的拟合结果表明，改性稻壳对Cr(Ⅵ)的吸附较好地符合准二级动力学模型和Freundlich等温模型，吸附过程以多层化学吸附为主。改性稻壳吸附Cr(Ⅵ)的热力学参数显示吸附Cr(Ⅵ)的过程中△G＜0、△H＞0、△S＞0。结果表明，改性稻壳对Cr(Ⅵ)的吸附过程是自发进行、吸热且熵增的过程。此外，XPS分析表明吸附过程中有部分Cr(Ⅵ)被还原为Cr(Ⅲ)。经过4次循环吸附后，改性稻壳的吸附活性仍然较高，对Cr(Ⅵ)的去除率仍可达到69。08％。
Preparation and Investigation of Adsorption Performance for Polyethylenimine-modified Rice Husk
Rice husk,a by-product of rice dehulling,is a widely produced agricultural waste resource during agricultural processes.The utilization of this low-added-value rice husk to produce high-efficiency adsorption material carries significant importance.In this study,the rice husk was used as raw material,and polyethyleneimine was successfully grafted onto the surface of rice husk through a simple cross-linking reaction,thus preparing a biomass adsorbent with good adsorption performance for Cr(Ⅵ).The research results indicate that the optimal conditions for the adsorption process as temperature 60 ℃,pH 2.Under optimal adsorption conditions,the maximum adsorption capacity for Cr(Ⅵ)of the modified rice husk was 113.76 mg/g.The results of adsorption isotherm and adsorption kinetics indicate that the pseudo-second-order model and the Freundlich equation provided a better description of the adsorption behavior of Cr(Ⅵ)on rice husk,indicating that the adsorption process is a multilayer chemical adsorption.The thermodynamic parameters of Cr(Ⅵ)adsorption process by modified rice husk show that △G＜0,△H＞0 and △S＞0),which indicates that the adsorption of Cr(Ⅵ)by modified rice husk is a spontaneous,endothermic and entropy increasing process.In addition,XPS analysis showed that a portion Cr(Ⅵ)was reduced to Cr(Ⅲ)during the adsorption process.And after four cycles,the adsorption activity of modified rice husk remained high,and the removal rate of Cr(Ⅵ)can still reach 69.08％.

rice huskpolyethyleneiminegrafted,adsorptionCr(Ⅵ)

汪睿琪、周卫宝、徐石江、何金萱、李娟、姚梦杰、罗建新、李文军

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湖南工学院材料科学与工程学院,湖南 衡阳 421002

稻壳 聚乙烯亚胺 接枝 吸附 Cr(Ⅵ)

湖南省应用特色学科材料科学与工程学科湖南省自然科学基金项目湖南省教育厅科学研究项目湖湘青年科技创新人才项目湖南省大学生创新创业训练计划项目湖南省大学生创新创业训练计划项目湖南省大学生创新创业训练计划项目

湘教通[2022]351号2020JJ512021A05672020RC3055S202311528067S202311528067S202311528067

2024

10.19672/j.cnki.1003-6504.0334.24.338

环境科学与技术
湖北省环境科学研究院

环境科学与技术

CSTPCD北大核心
影响因子：0.943
ISSN：1003-6504
年,卷(期)：2024.47(7)