摘要
以木薯淀粉为主要原料,环氧氯丙烷为交联剂,CS2为酯化剂,过硫酸铵/亚硫酸氢钠为引发剂,丙烯酰胺和丙烯酸为接枝单体,经交联-酯化-接枝制得交联型木薯淀粉黄原酸酯-g-AA/AM,进一步采用反相乳液聚合法得到复合变性淀粉微球。考察了诸因素对合成的影响,确定的较佳工艺条件为:酯化反应的m(NaOH)∶m(干基淀粉)=0.08∶1.00,m(CS2)∶m(干基淀粉)=0.882∶1.000,酯化时间4h,酯化温度35℃;接枝反应的m(单体)∶m(干基酯化淀粉)=0.8∶1.0,引发剂浓度0.289mol/L,接枝温度35℃,接枝时间3.5h。采用红外光谱、扫描电镜、X-射线衍射和热重分析对交联型木薯淀粉黄原酸酯-g-AA/AM微球进行了表征。通过对含铬废水的吸附研究表明,交联型木薯淀粉黄原酸酯-g-AA/AM微球对铬(Ⅵ)的去除率可高达97%以上。
The crosslinked acrylamide/acrylic acid grafted xanthates cassava starch was synthesized by crosslinkingesterifying-grafting with cassava starch as main raw material,epichlorohydrin as crosslinking agent,carbon disulfide as esterification agent,ammonium persulfate/sodium bisulfite as grafting initiator,acrylamide and acrylic acid as grafting monomer.Moreover,composite modified starch microspheres were prepared by inverse emulsion polymerization.The factors for preparation of product were studied,the better process condition was determined as follows：in esterification reaction m（NaOH）∶m（starch）=0.08∶1.00,m（CS2）∶m（starch）=0.882∶1.000,esterification time 4h,esterification temperature35℃.In grafted reaction m（monomer）∶m（esterified starch）=0.8∶1.0,concentration of initiator 0.289 mol/L,grafting temperature 35℃,grafting time 3.5h.The products were characterized by infrared spectrometry,SEM,XRD and TG.The results showed that the removal rate of Cr（Ⅵ）reached up to 97%in adsorption research to chrome-contained wastewater by the microspheres.
出处
《化工新型材料》
CAS
CSCD
北大核心
2015年第11期160-162,169,共4页
New Chemical Materials
基金
桂林市科学研究与技术开发项目(20150105-5)
广西矿冶与环境科学实验中心资助项目(KH2013YB013)
关键词
木薯淀粉衍生物微球
合成
重金属吸附
表征
cassava starch derivative microsphere
synthesis
heavy metal adsorption
characterization
