DTC改性木薯淀粉重金属螯合剂的合成与表征.pdf

化工进展
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CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2010年第29卷第7期
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研究开发
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DTC改性木薯淀粉重金属螯合剂的合成与表征
尚小琴',罗楠2,梁敏华,杨素改,谢国仁
(广州大学化学化工学院,广东广州510002江西省环境保护科学研究院广东分院,广东广州51000
摘要:以木薯淀粉-N-羟甲基丙烯酰胺接枝共聚物(Stg-NMA)为主要原料,通过二硫代魚基甲酸盐(DTC)
改性合成重金属高子螯合剂(DTCS),考察了反应温度、时间、CS2用量等多因素对反应过程的影响,并通过红
外光语对其结构进行表征。实验结果显示,反应温度和时间、CS2用量、溶剂用量、NaOH用量对反应过程影响
显著,最佳反应条件为T=45℃、=18h、ves2=1.5mL、vs=40mL、NaOH质登分数=0.4,合成的DTCS对多种
重金属离子去除率接近100%;红外光谱表征证明基和一CS2基团成功引入贅合淀粉骨架中
关鍵词:木薯淀粉;接枝共聚物;二硫代氪基甲酸盐:重金属离子;螯合剂
中图分类号:X703.5;TQ316.6
文献标识码:A
文章编号:1000-6613(2010)07-1330-04
Synthesis and characterization of heavy metal chelate of
Dtc-modified cassava starch
SHANG Xiaogin LUO Nan, LIANG Minhua, YANG Sugai, XIE Guoren
(School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, Guangdong, China
jiangxi Academy of Environmental Sciences Guangdong Branch, Guanghou 510000, Guangdong, 2, na
Abstract: Heavy metal chelate DTCS was synthesied by amination and nucleophilic addition using
ST-G-NMA graft copolymer(n-methylolacrylamide grafted cassava starch )as starting material
diethylenetriamine as an amination agent and carbon disulfide as a nucleophilic addition reagent
Effects of reaction temperature and time, content of CS2 and solvent, as well as the alkalinity of
reaction medium on sulphur content in DTCS were investigated. Meanwhile, the structure of DTCS
was characterized by FTIR. The optimal synthetic conditions were found as: =45 C, =18 h
Vc=1.5 m, s=40 m, ANAOH=0. 4. The obtained DTCS showed a sulphur content of higher than 6%
with which the removal efficiency of several heavy metal ions was close to 100%. FTIR analysis
proved that the ST-G-NMA graft copolymer was successfully modified by DTC.
Key words: cassava starch:; graft copolymer dithiocarbamate(DTC ); haver metal ions; chelating agent
电镀等工业废水排放量大,且含有多种重金属到限制。以可再生资源淀粉为代表的天然高分子废
离子,对人体健康和生态环境危害极大。传统的化水处理药剂,原料易得、价格低廉,不仅可以有效
学沉淀方法存在处理效率低和沉渣量大等问题,难地解决合成高分子药剂存在的问题,而且天然高分
以达到理想的排放要求。因此如何开发新型高效化
学处理药剂,始终是人们研究的重点2。近年来收稿日期:20100-14修改稿日期:2010320
研究和开发的高分子重金属离子处理药剂凭借其与蒸金项目:广东省自然科学基金(9151000东省科技
金属离子极强的整合能力,为重金属废水治理带来
攻关项月(071051900013)及广州市科技支撑项目(2009Z1-E531)
资助。
了新的生机?。然而,合成高分子处理药剂价格
第一作者介绍:尚小琴(1962-),女,教投,博土,从事改性淀粉
昂贵,存在单体毒性和难降解等问题,使其应用受等高分子功能材料的研究。E- mail hush@63com