纳米钛酸管对防污剂异噻唑酮的控释作用

以纳米钛酸管为包埋载体,4,5-二氯-2-正辛基-4-异噻唑啉-3-酮(简称异噻唑酮)为防污剂,利用毛细吸附作用,将异噻唑酮防污剂包埋进纳米钛酸管,并对纳米钛酸管中异噻唑酮的释放进行了研究。紫外-可见分光光度计检测表明,纳米钛酸管可有效包埋异噻唑酮防污剂,最大包埋质量分数为12%;不同的包埋工艺,防污剂有不同的释放速率,最大释放速率为0.14 mg/(L/d),最小释放速率仅为0.05 mg/(L/d),所以纳米钛酸管具有较好的控制释放能力。纳米钛酸管样品在w(NaC l)=3%的水溶液中的释放速率与在蒸馏水中的相差不大。

Performance of Controlled Release of Antifouling Agent in Nanotubes of Titanic Acid

Nanotubes of titanic acid were utilized as a microencapsulated vehicle,and 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one(called isothiazoline for short) was used as an antifouling agent.The antifouling agent isothiazoline could enter the lumen of the nanotubes of titanic acid by capillary attraction and be entrapped effectively.The maximum entrapped mass fraction is 12% by the total weight of the sample.Different encapsulation procedures were performed,and the release rates were obtained by determination with UV-visible spectrophotometer.The maximum release rate is 0.14 mg/(L/d),and the minimum release rate is only 0.05 mg/(L/d).Hence,the nanotubes of titanic acid have a good performance of controlled release of isothiazoline.The release rate of isothiazoline in nanotubes of titanic acid samples is indiscriminate for samples in distilled water and in w(NaCl)=3% water solution.