改性玉米芯生物炭对废水中磷酸根态磷的吸附

doi:10.13438/j.cnki.jdzk.2024.03.008

吉首大学学报（自然科学版） ›› 2024, Vol. 45 ›› Issue (3): 55-62.DOI: 10.13438/j.cnki.jdzk.2024.03.008

改性玉米芯生物炭对废水中磷酸根态磷的吸附

李洁，李波，张孝东，李斌，周影茹

（1.吉首大学生物资源与环境科学学院，湖南吉首 416000；2.湘西土家族苗族自治州吉首生态环境监测站，湖南吉首 416000）

出版日期:2024-05-25 发布日期:2024-06-19
通讯作者: 周影茹（1985—），女，陕西西安人，吉首大学生物资源与环境科学学院讲师，博士，主要从事面源污染与土壤污染修复研究.E-mail:zhouyingru1985@163.com.
作者简介:李洁（2001—），女，湖南邵阳人，吉首大学生物资源与环境科学学院实验员，主要从事面源污染修复研究
基金资助:
国家自然科学基金资助项目（41661096）；湖南省教育厅项目（19C1542）；2021年湖南省大学生创新创业训练项目（2954）

Performance Study of Modified Biochar for Phosphorus Adsorption in Water Bodies

LI Jie,LI Bo,ZHANG Xiaodong,LI Bin,ZHOU Yingru

(1.College of Bio-Resources and Environmental Science,Jishou University,Jishou 416000,Hunan China;2.Jishou Ecological and Environmental Monitoring Station,Xiangxi Tujia and Miao Autonomous Prefecture,Jishou 416000,Hunan China)

Online:2024-05-25 Published:2024-06-19

摘要/Abstract

摘要：以玉米芯为原料，经NH₃·H₂O预处理、MgCl₂·6H₂O溶液浸渍后制备改性玉米芯生物炭（MCC），对改性前后生物炭的形貌进行了表征，并探究了MCC对废水中磷酸根态磷的吸附性能.结果表明，与原始生物炭相比，MCC更加疏松多孔，其BET比表面积为原始生物炭的2.04倍.此外，MCC还具有更多的羰基官能团，这使得MCC对磷的吸附能力更强，废水中磷的初始质量浓度为40 mg/L时，MCC的吸附量达到16.59 mg/g.模拟吸附体系中，当pH值为6、吸附温度为25 ℃时，MCC对磷的吸附性能最佳.初始磷质量浓度在0~60 mg/L范围内时，MCC的吸附能力随着磷质量浓度的升高而增强.MCC对磷的吸附过程符合Langmuir、Freundlich模型和准二级动力学模型，吸附既存在单分子层化学吸附，又存在多分子层物理吸附.MCC的理论饱和吸附量为32.60 mg/g，在废水除磷方面具有较好的应用潜力.

关键词： 生物炭, 改性, 吸附, 磷酸盐

Abstract: Modified charcoal (MCC) was made from corn cobs pretreated by NH₃·H₂O and impregnated with MgCl₂·6H₂O.The morphology and functional groups of MCC was characterized,and its impact on phosphate phosphorus adsorption was investigated.The results showed that MCC had a more porous structure,with a BET surface area of 2.04 times that of pristine biochar.Additionally,MCC had more carbonyl functional groups,and a higher capacity for phosphorus adsorption.When the initial phosphorus concentration was 40 mg/L, the phosphorous adsorption by MCC reached 16.59 mg/g.In simulated adsorption,the ideal adsorption conditions were found to be at pH 6 and 25 °C.When the initial phosphorus concentration is between 0 and 60 mg/L,the adsorption capacity of MCC increases with the increase in phosphorus content.The adsorption process followed the pseudo-secondary kinetic model and the Langmuir and Freundlich models,with both single molecular layer chemical adsorption and multi molecular layer physical adsorption.The theoretical saturation adsorption capacity of 32.60 mg/g demonstrated the potential for phosphorus removal from wastewater.

Key words: biochar, modification, adsorption, phosphorus

李洁, 李波, 张孝东, 李斌, 周影茹. 改性玉米芯生物炭对废水中磷酸根态磷的吸附[J]. 吉首大学学报（自然科学版）, 2024, 45(3): 55-62.

LI Jie, LI Bo, ZHANG Xiaodong, LI Bin, ZHOU Yingru. Performance Study of Modified Biochar for Phosphorus Adsorption in Water Bodies[J]. Journal of Jishou University(Natural Sciences Edition), 2024, 45(3): 55-62.

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改性玉米芯生物炭对废水中磷酸根态磷的吸附

Performance Study of Modified Biochar for Phosphorus Adsorption in Water Bodies

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