摘要
水稻秸秆是一种常见的农业废弃物,将其制备为生物炭,在水污染控制领域具有良好的应用前景。本研究通过一系列室内实验,考察了投加量、温度、pH等因素对水稻秸秆生物炭吸附磷酸盐效果的影响。在此基础上,进一步通过等温吸附模型及吸附动力学模型,探讨了水稻秸秆生物炭对磷酸盐的吸附机理。结果表明,投加量为1g·L^(-1)时,水稻秸秆生物炭对20 mg·L^(-1)磷酸盐(以磷计)的吸附去除率可达67.25%;温度及pH对磷酸盐的吸附效果存在显著影响,温度越高(0~30℃)吸附效果越好。此外,酸性条件下的吸附效果要好于碱性条件。通过等温吸附及吸附动力学模型拟合发现,磷酸盐在水稻秸秆生物炭上的吸附主要以单分子层吸附为主,理论最大吸附容量可以达到41.92mg·g^(-1);1h内的吸附容量可达平衡吸附容量的96%,吸附速率快,吸附过程受化学吸附控制。本研究可为水稻秸秆生物炭应用于吸附除磷提供理论与技术支持。
Rice straw,a common agricultural waste,held significant promise in the field of water pollution control when converted into biochar.In this study,a series of laboratory experiments were conducted to investigate the effects of dosage,temperature,and pH on the adsorption efficiency of phosphates by rice straw biochar.Subsequently,the adsorption mechanisms of phosphates onto rice straw biochar were explored using adsorption isotherm models and adsorption kinetics models.The results revealed that at a dosage of 1g/L,rice straw biochar achieved a phosphate removal rate of 67.25%for a 20 mg/L phosphate solution(as phosphorus).Temperature and pH significantly influenced its phosphate adsorption capacity,with higher temperatures(ranging from 0~30℃)enhancing adsorption efficiency.Additionally,acidic conditions exhibited better adsorption performance compared to alkaline conditions.Analysis using isotherm and kinetic models demonstrated that phosphate adsorption onto rice straw biochar primarily occurred as monolayer adsorption,with a theoretical maximum adsorption capacity of 41.92 mg/g.Furthermore,the adsorption process displayed rapid kinetics,reached 96%of equilibrium adsorption capacity within 1h,indicated chemical adsorption control.This study provided theoretical and technical support for the application of rice straw biochar in phosphate removal through adsorption.
作者
黄志勇
李欣欣
HUANG Zhiyong;LI Xinxin(Guizhou Water&Power Survey-Design Institute Co.,Ltd.,Guiyang 550002,China;Academy of Environmental Planning and Design,Co.,Ltd.,Nanjing University,Nanjing 210000,China)
出处
《化工技术与开发》
CAS
2024年第4期1-5,共5页
Technology & Development of Chemical Industry
基金
国家自然科学基金项目(52269025)
贵州省水利科技项目(KT202226)。
关键词
水稻秸秆
生物炭
磷酸盐
吸附
吸附动力学
吸附等温线
rice straw
biochar
phosphate
adsorption
adsorption kinetics
adsorption isotherm
