巯基修饰竹粉生物吸附剂对Cd(Ⅱ)的吸附性能  

Adsorptive behavior of Cd(Ⅱ) by thiol-modified bamboo powder biosorbent

作　　者：艾天[1] 姜效军[1] 于洪梅[1] 朱秀慧[1] 杨秀玲[1] 王起凡 

机构地区：[1]辽宁科技大学化学工程学院,辽宁鞍山114051

出　　处：《安全与环境学报》2014年第5期156-160,共5页Journal of Safety and Environment

摘　　要：以楠竹竹粉(BP)为原料,经氢氧化钠预处理,再由巯基乙酸化学改性制备两种新型竹粉生物吸附剂SBP和TBP,对其结构进行了红外表征。考察了溶液pH值、温度、吸附剂量和吸附时间对SBP和TBP吸附Cd(Ⅱ)性能的影响,研究了其吸附动力学和等温吸附模型。结果表明,pH值和吸附剂用量对吸附率影响显著,温度降低更有利于吸附的进行。吸附动力学可用准二级动力学方程描述,吸附过程为化学吸附所控制。SBP和TBP对Cd(Ⅱ)的吸附行为符合Langmuir和Freundlich模型,其最大吸附量分别为81.30 mg/g和163.93 mg/g。The paper is inclined to present the experimental results in preparing two novel bamboo powder biosorbents known as SBP and TBP v/a NaOH pretreatment. In our experiments, we have taken the bamboo powder （BP） as raw material, and then tested the chemical modification with thioglycolie acid, whose structure can be characterized by using FTIR. Since the mercaptoaeetic acid involves the reaction and being tested through the comparison among the FTIR spectra of BP, SBP and TBP, it may help to facilitate the attachment of the mereapto groups to the bamboo powder. For this benefits, we have done our investigations of the effects of SBP and TBP on Cd（ lI ） ad- sorption behaviors on the condition that the pH value of the solution equals 2 to 7, which shows that the adsorption rate can be raised with the increase of the pH value when it is higher than 5.0 and then turn to be balanced when pH≥ 5.0. We have also investigated the effects of SBP and TBP on Cd （ 1] ） adsorption behaviors, on the condition that the temperature of the solution rises from 20 ℃ to 60 ℃ . The results of the investigation show that the adsorption rate tends to decrease slightly with the increase of the temperature. On examining the effects of SBP and TBP on Cd（Ⅱ ） adsorption behavior with the adsorption doses being 20- 160 mg, we have disclosed that the adsorption rate tends to gradually increase and then gets flattened out with the increase of the quality of SBP and TBP. And, later, when the adsorption doses reach 100 mg, the balanced condition can be reached when the adsorption of two kinds of adsorbents for Cd （Ⅱ ） becomes equal. It is in this way that we have worked out the adsorption kinetics and isothermal adsorption model. In addition, it was found that, with the adsorption time prolonging, the adsorption amount would also increase till the adsorption equilibration reaches basically by the time of 50 min. The calculation of △G° shows that, the adsorption process is by nature spontaneous, which can be released e

关 键 词：环境工程学 巯基修饰 竹粉 生物吸附 Cd(Ⅱ) 

分 类 号：X703.1[环境科学与工程—环境工程]