摘要
对壳聚糖-CdS复合纳米粒子在光催化降解茜素红的应用进行研究.结果表明,在2min时茜素红降解效率可达28.6%—82.7%,30min时茜素红降解效率达到71.9%—98.2%;茜素红在光催化降解过程中最大吸收波长261nm处的吸收峰迅速减弱,并最终消失,而在223nm和228nm处分别出现了新的吸收峰,说明茜素红发生了降解;溶液pH值对光催化降解茜素红有一定的影响,在弱酸性条件下降解效率较高;壳聚糖-CdS复合纳米粒子比CdS粒子降解效率高,2min时降解效率高出24.2%,30min时高出28.4%.
The alizarin red was degraded rapidly by chitosan-CdS composite nanoparticles in a short time. The elimination efficiency of alizarin red reached 28.6%-82. 7% at 2min and 71.9%-98.2% at 30min when the concentration was 20mg ·l^-1 in 100ml solution containing 0. 01-0. 07g chitosan-CdS composite nanoparticles. The absorption peak becomes weak rapidly and disappears finally at maximum absorption wavelength 261nm during the photocatalytical elimination of alizarin red, and the new absorption peaks appear at 223nm and 228nm respectively, which showed new products formed. Elimination of alizarin red was pH-dependent, higher at acidic conditions than at neutral and alkaline. The photocatalytical elimination efficiency of chitosan- CdS composite nanoparticles was increased by 24. 2% and 28.4% respectively at 2min and 30min compared with common CdS.
出处
《环境化学》
CAS
CSCD
北大核心
2007年第2期157-160,共4页
Environmental Chemistry
基金
国家重点基础研究发展规划项目计划课题(2003CB615706)资助
