CORE
🇺🇦
make metadata, not war
Services
Services overview
Explore all CORE services
Access to raw data
API
Dataset
FastSync
Content discovery
Recommender
Discovery
OAI identifiers
OAI Resolver
Managing content
Dashboard
Bespoke contracts
Consultancy services
Support us
Support us
Membership
Sponsorship
Community governance
Advisory Board
Board of supporters
Research network
About
About us
Our mission
Team
Blog
FAQs
Contact us
unknown
Au(Ⅲ)离子在黑曲霉菌上的吸附热力学和动力学特性
Authors
孙道华
张金丽
+4 more
景孝廉
李清彪
郑艳梅
黄加乐
Publication date
15 April 2013
Publisher
Abstract
以黑曲霉菌作为生物吸附剂,研究其对Au(Ⅲ)离子的吸附特性,考察了pH值、吸附时间、温度和初始Au(Ⅲ)离子浓度等因素对吸附过程的影响。结果表明,Au(Ⅲ)离子在黑曲霉菌上的吸附过程对溶液pH值具有一定的依赖性,最佳pH值为2.0~3.0。升温能明显加快吸附进程,20℃下吸附过程分为2个阶段进行,分别对应于Au(Ⅲ)离子还原前和还原后的吸附,24h后吸附趋于平衡,而30℃、40℃、60℃下吸附过程均无明显分段现象,并分别于12h、6h和1h后趋于吸附平衡。Au(Ⅲ)离子初始浓度367.94mg·L–1时,升温明显促进了吸附的进行。Au(Ⅲ)离子在黑曲霉菌上的吸附等温线可用Langmuir方程很好地模拟,20℃、30℃、40℃和50℃时其饱和吸附量分别为185.19mg·g–1、202.02mg·g–1、235.85mg·g–1和277.78mg·g–1。热力学参数吉布斯自由能变(0ΔG)、吸附焓变(0ΔH)和吸附熵变(0ΔS)的计算结果表明,Au(Ⅲ)离子在黑曲霉菌上的吸附过程是一个自发的吸热和熵增过程。其吸附动力学可用准二级速率方程描述,吸附活化能为55.71kJ·mol–1。傅立叶变换红外光谱分析的结果进一步揭示了菌体表面的酰氨基、羧基和羟基是参与吸附的主要功能基团
Similar works
Full text
Open in the Core reader
Download PDF
Available Versions
Xiamen University Institutional Repository
See this paper in CORE
Go to the repository landing page
Download from data provider
oai:dspace.xmu.edu.cn:2288/201...
Last time updated on 16/06/2016
Xiamen University Institutional Repository
See this paper in CORE
Go to the repository landing page
Download from data provider
oai:dspace.xmu.edu.cn:2288/201...
Last time updated on 16/06/2016