近日，课题组蒋茹博士题为“Colloidal CdS sensitized nano-ZnO/chitosan hydrogel with fast and efficient photocatalytic removal of congo red under solar light irradiation”的研究论文被中科院TOP期刊《International Journal of Biological Macromolecules》接收。该论文蒋茹博士为该论文的第一作者，台州学院为该论文的第一署名单位和通讯单位。International Journal of Biological Macromolecules主要聚焦于生物大分子改性、表征以及在环境、制药、食品等领域应用，2020年影响因子为5.162，中科院SCI期刊分区（ 2020年12月最新升级版）为化学类TOP二区期刊。
本研究以具有大量氨基功能基团的天然生物高分子壳聚糖为基体，再将纳米ZnO分散到壳聚糖体系内得到n-ZnO/CS；通过螯合合作将Cd2+离子吸附在n-ZnO/CS，得到Cd2+@n-ZnO/CS；最后通过硫脲中温释放S2-与Cd2+@n-ZnO/CS反应得到CdS@n-ZnO/CS凝胶体系。以刚果红（CR）为目标有机污染物，CdS@n-ZnO/CS凝胶体系在太阳光照射下对CR进行了光降解实验。研究表明，污染物初始浓度为5.0 mg?L?1时，CdS@n-ZnO/CS凝胶体系能1min内去除95%CR染料；污染物初始浓度为100.0 mg?L?1时，CdS@n-ZnO/CS凝胶体系能30min内去除94.34%染料。与非凝胶状态材料相比，CdS@n-ZnO/CS凝胶体系降解污染物速度更快、效果更好。实验证实，CdS@n-ZnO/CS凝胶体系在自然太阳光照射下也能有效降解CR有机染料，这表明CdS@n-ZnO/CS凝胶体系有望在实际废水处理中得到应用。
本研究得到国家自然科学基金（51208331）、浙江省自然科学基金（LTY21B070001、LY15E080002、LY14b070011）和台州学院杰出青年科学基金（2018JQ001）的资助。
Colloidal CdS sensitized nano-ZnO/chitosan (CdS@n-ZnO/CS) hydrogel was prepared and characterized extensively by XRD, SEM-EDS, TEM, UV–Vis DRS, FT-IR and TGA. The photocatalytic activity of CdS@n-ZnO/CS was evaluated with the photodegradation of congo red (CR) as an organic pollutant under solar light irradiation. The influences of initial dye concentration, catalyst dosage, recycling runs, and radical scavenger on decolorization of CR by CdS@n-ZnO/CS were investigated. 95% of CR was removed in just 1?min for 5.0?mg?L?1 and 94.34% of CR was removed in 30?min for 100?mg?L?1. CdS@n-ZnO/CS exhibited an excellent and ultra-fast performance toward CR removal under solar light due to the synergistic effect of adsorption by chitosan and photocatalysis by ZnO and CdS in CdS@n-ZnO/CS hydrogel. Radical trapping control experiments indicated that h+ and O2? played the major role for CR decolorization. The high performance of CdS@n-ZnO/CS hydrogel was also demonstrated under natural solar light irradiation, suggesting that CdS@n-ZnO/CS hydrogel could be used in practical wastewater treatment.
论文链接网址为：https://authors.elsevier.com/sd/article/S0141-8130(21)00108-2