摘要
对废弃卷烟烟叶进行炭化处理后再引入氨基功能基团制备了氨基化烟叶生物炭吸附剂(ATC),通过SEM、FTIR、XPS对ATC进行了表征,考察了p H、ATC投加量、温度、吸附时间、U(Ⅵ)初始质量浓度对ATC吸附U(Ⅵ)的影响。结果表明,在U(Ⅵ)初始质量浓度为250 mg/L、p H=6、ATC投加量为0.2 g/L、温度为40℃、吸附时间为210 min时,ATC对U(Ⅵ)的最大理论吸附量为495.04 mg/g。吸附动力学符合准二级动力学模型;Langmuir吸附等温模型能更好地描述ATC对U(Ⅵ)的吸附行为。ATC对U(Ⅵ)的吸附去除机理主要包括静电相互作用,与—NH2、—OH、—COOH的配位络合,与Si—O—Si的"π-π"相互作用。5次吸附-解吸实验后,ATC对U(Ⅵ)的吸附率在86.71%以上。
Ammoniated tobacco biochar adsorbent (ATC) was prepared by carbonizing waste tobacco leaves and then introducing amino functional groups.The sample was characterized by SEM,FTIR and XPS.The effects of p H,ATC dosage,temperature,adsorption time and initial mass concentration of U(Ⅵ)on ATC for adsorption U(Ⅵ) were investigated.The results showed that under the conditions of initial mass concentration of U(Ⅵ) of 250 mg/L,p H=6,ATC dosage of 0.2 g/L,temperature of 40℃and adsorption time of 210 min,the maximum theoretical adsorption capacity of ATC for U(Ⅵ) was 495.04 mg/g.Adsorption kinetics conformed to the quasi-second-order kinetic model and the adsorption behavior of ATC for U(Ⅵ) could better be described by the Langmuir adsorption isotherm model.The adsorption and removal mechanism of U(Ⅵ) by ATC mainly included electrostatic interaction,coordination and complexation with amino,hydroxyl,carboxyl groups,and interaction with“π-π”of Si—O—Si.After 5adsorption-desorption tests,the removal rate U(Ⅵ) by ATC was above 86.71%.
作者
胡世琴
杨斌
范甲
杨金辉
张震
谢水波
HU Shiqin;YANG Bin;FAN Jia;YANG Jinhui;ZHANG Zhen;XIE Shuibo(School of Civil Engineering,University of Nanhua,Hengyang 421001,Hunan,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2021年第12期2566-2572,2585,共8页
Fine Chemicals
基金
国家自然科学基金(21177053)
湖南省研究生科研创新项目资助(CX20200940)。
关键词
吸附
U(Ⅵ)
氨基化
烟叶
生物炭
水处理技术
adsorption
U(Ⅵ)
ammonification
tobacco
biochar
water treatment technology
