氧化纤维素负载二氧化钛的制备工艺研究

Study on Preparation Technology of Oxycellulose Coated with Titanium Dioxide

首先采用高碘酸钠对纤维素进行选择性氧化, 再用高锰酸钾进一步氧化, 获得局部氧化的双羧基纤维 素, 然后在二氧化钛悬浊液里超声处理而负载二氧化钛, 最后用叶绿素铜钠溶液浸泡, 获得负载有敏化二氧化钛的 纤维素材料.通过实验确定较合理的工艺参数为： 高碘酸钠浓度0.05 mol/L时, 在 40℃下对纤维素氧化4h , 然后 在 60℃下氧化40 min ;0℃下, 高锰酸钾（ 0. 4mol/L ）氧化2 0min ;二氧化钛处理时超声两次, 二氧化钛含量0. 0120g/50 mL （去离子水）叶绿素铜钠含量0.0100g/50mL （去离子水）, 敏化时间10 h .通过 FTIR、 FE：SE：M、XRD等对 实验样品进行表征, 结果显示： 二氧化钛较均匀地负载在非织造布上, 且其表面被叶绿素铜钠敏化.

Sodium periodate was used to oxidize cellulose selectively,and potassium permanganate was applied to oxidize it further to gain dicarboxyl cellulose oxidized partially.Then,titanium dioxide was coated in titanium dioxide suspension by ultrasonic processing.Finally,it was soaked for some time in the sodium copper chlorophyll solution to gain cellulosic material coated with titanium dioxide.Reasonable parameter values are obtained as follows through the experiment:the concentration of sodium periodate(0.05mol/L),cellulose oxidation(40 ℃,4h;60 ℃,40min),potassium permanganate(0.4mol/L;40℃,20min),ultrasound treatment twice,titanium dioxide content(0.0120g/50 mL deionized water),sodium copper chlorophyll content(0.0100g/50 mL deionized water),and sensitization time(10h).By the analyses of FTIR,SEM and XRD,we are sure that titanium dioxide can be coated evenly on the nonwoven fabric,and its surface is sensitized by sodium copper chlorophyll.