PDF《改性生物质材料对 Cr（Ⅵ）的吸附性能》

第 卷第 期 中国有色金属学报 年月25

5 2015

5 Volume

25 Number

5 The Chinese Journal of Nonferrous Metals May

2015 文章编号:1004-0609(2015)-05-1362-08 改性生物质材料对 Cr(Ⅵ)的吸附性能 揭诗琪

1 ,乔丽媛

1 ,李明明

1 ,柳若霖

1 ,冯雨晴

1 ,朱建裕 1,

2 ,覃文庆 1,

2 (1.

中南大学 资源加工与生物工程学院,长沙 410083;

2. 中南大学 生物冶金教育部重点实验室,长沙 410083) 摘要:在N,N-二甲基甲酰胺中,以次磷酸钠作为催化剂,采用柠檬酸对泡桐皮、芦苇、花生叶

3 种生物质材料进 行化学改性,制备得到生物吸附剂,并研究 Cr(Ⅵ)溶液 pH 值、初始溶液 Cr(Ⅵ)浓度、吸附时间等因素对水溶液 中Cr(Ⅵ)吸附率的影响.采用红外光谱分析仪对吸附材料的分子结构及其化学键进行表征.结果表明:3 种改性 生物质材料在 pH 值为

2、Cr(Ⅵ)初始浓度为

30 mg/L 时,吸附性能较好,吸附平衡时间为

120 min.可以用准二 级动力学方程很好地描述生物质材料吸附过程.改性后的泡桐皮、芦苇、花生叶对 Cr(Ⅵ)的最大吸附率分别为 96.78%、91.85%和89.63%,其中改性后泡桐皮具有最大的吸附量. 关键字:泡桐皮;

芦苇;

花生叶;

Cr(Ⅵ);

化学改性;

重金属;

生物质吸附 中图分类号:X703.1 文献标志码:A Adsorption properties of Cr(Ⅵ) by modified biomass materials JIE Shi-qi1 , QIAO Li-yuan1 , LI Ming-ming1 , LIU Ruo-lin1 , FENG Yu-qing1 , ZHU Jian-yu1,

2 , QIN Wen-qing1,

2 (1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;

2. Key Laboratory of Biometallurgy, Ministry of Education, Central South University, Changsha 410083, China) Abstract: Paulownia peel, reed and peanut leaf were chemically modified with citric acid by using sodium hypophosphite monohydrate (NaH2PO2・H2O) as a catalyst in N,N-dimethylformamide (DMF) to obtain biosorbents. The effects of pH of Cr(Ⅵ) solution, initial concentration of Cr(Ⅵ), adsorption time on the adsorption efficiency of Cr(Ⅵ) in aqueous solution were investigated. Fourier transform infrared spectroscopy were used to characterize the molecular structure and its chemical bond of the adsorbent. The results show that, when pH value is

2 and the initial concentration of Cr(Ⅵ) is 30mg/L, three biomass materials have superior adsorptive properties. The adsorption processes achieves equilibrium within

120 min and are found to be well described by the pseudo-second order adsorption kinetics. The maximum adsorption efficiencies of Cr(Ⅵ) by modified paulownia peel, reed and peanut leaf are 96.78%, 91.85% and 89.63%, respectively. Among these biosorbents, the modified paulownia peel has the highest adsorption quantity. Key words: paulownia peel;

reed;

peanut leaf;

Cr(Ⅵ);

chemical modification;

heavy metal;

biomass adsorption 随着全球人口急剧增长和现代工业的快速发展, 人们对水资源的需求大幅增加,但与此同时,河流的 污染也日趋严重.其中,重金属污染问题已经成为水 资源污染最严重的问题之一[1] .通过调查,重金属污 染主要来自于各种工业产生和排放的废物.仅2012 年金属制品业、有色金属冶炼和加工业,皮革及其制 品和制鞋业,化学化工业几大行业,重金属排放总量 就达到 377.1 t[2] , 对全国各流域水质造成了重大污染. 基金项目:国家自然科学基金资助项目(51174239);

中南大学大学生创新训练项目(LC12122) 收稿日期:2014-09-22;