ISWC OpenIR  > 水保所知识产出(1956---)
两种木材生物炭对铜离子的吸附特性及其机制
王彤彤1; 马江波1; 曲东1; 张晓媛1; 郑纪勇1,2; 张兴昌1,2
2017
Source Publication环境科学
Volume38Issue:5Pages:2161-2171
Abstract

为探索高效利用废弃生物质资源制备生物炭去除水体和土壤中Cu2 + 污染的可行性,本文以常见的农林废弃物苹果树
枝和梧桐木锯末为原料,采用450℃限氧热裂解法制备生物炭,通过两种生物炭对Cu2 + 的批量吸附试验,利用4 种等温吸附模
型( Langmuir、Freundlich 模型、Temkim、D-R 模型) 和4 种吸附动力学模型( 准一级动力学、准二级动力学、Elovich 模型、颗
粒内扩散模型) 研究了苹果枝和锯末生物炭对Cu2 + 的吸附行为. 同时,使用FTIR 红外、SEM 和BET 比表面积及孔径分析等
技术表征了生物炭的理化性质,研究了两种生物炭对Cu2 + 吸附机制,分析了两种生物炭之间的吸附特性差异及其影响因素.
结果表明: ①苹果枝生物炭在3 h 达到吸附平衡,理论最大吸附量为15. 85 mg·g - 1 ,锯末生物炭在6h 达到吸附平衡,理论最大
吸附量为17. 44 mg·g - 1 ,与其他研究相比,这两种生物炭体现了较高的Cu2 + 吸附性能; ②两种生物炭对Cu2 + 的热力学吸附均
较好地符合Langmuir 模型,表明吸附过程主要是近似单分子层的有益吸附; 动力学吸附均符合准二级吸附动力学模型,表明
其对Cu2 + 的吸附包括表面吸附、颗粒内扩散和液膜扩散等多种过程; ③吸附机制主要包括静电吸附,配体( 酚羟基) /离子
( H + ) 交换和阳离子—π 键作用.

Other Abstract

In order to utilize the waste biomass resources efficiently,two raw materials of sawdust and apple branch were selected to
produce biochars at 450℃ by oxygen-limited pyrolysis,and the adsorptions of Cu2 + in aqueous solutions were evaluated. The effects of
initial Cu2 + concentration and contact time in batch sorption experiments were investigated by the four kinds of isothermal adsorption
models ( Langmuir,Freundlich,Temkim,D-R model) and the four kinds of adsorption kinetics models ( Pseudo first-order,Pseudo
second-order,Elovich model,Intraparticle diffusion model) . The influencing factors of adsorption characteristics about sawdust biochar
( JB) and apple branch biochar ( PB) were discussed by characterizing their elemental composition,functional groups,surface area,
surface morphology and scanning electron microscope. The results showed that: ①The adsorption equilibrium of PB and JB was
reached in three hours and six hours,respectively,and the maximum adsorption capacity of PB and JB reached 15. 85 mg·g - 1 and
17. 44 mg·g - 1 ,respectively. Compared with other studies,these biochars showed higher Cu2 + adsorption performance. ②The
adsorption kinetics was best fitted by the pseudo-second order model,while the isothermal adsorption was best described by Langmuir
isotherms. This indicated that the beneficial adsorption process via monolayer was affected by intraparticle diffusion,surface adsorption
and liquid film diffusion. ③The adsorption mechanism for Cu2 + is a complex interaction of physical and chemical factors. Electrostatic
interaction of physical adsorption is mainly adsorption mechanism,Chemical adsorption mechanism includes generally ligand exchange
( phenolic hydroxyl) /ion exchange ( H + ) and cationic—π. It was demonstrated that JB and PB could be considered as promising
materials to immobilize heavy metals in contaminated water or soil.

Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8448
Collection水保所知识产出(1956---)
Affiliation1.西北农林科技大学资源环境学院
2.中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国 家重点实验室
Recommended Citation
GB/T 7714
王彤彤,马江波,曲东,等. 两种木材生物炭对铜离子的吸附特性及其机制[J]. 环境科学,2017,38(5):2161-2171.
APA 王彤彤,马江波,曲东,张晓媛,郑纪勇,&张兴昌.(2017).两种木材生物炭对铜离子的吸附特性及其机制.环境科学,38(5),2161-2171.
MLA 王彤彤,et al."两种木材生物炭对铜离子的吸附特性及其机制".环境科学 38.5(2017):2161-2171.
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