近日，課題組蔣茹博士題為“Colloidal CdS sensitized nano-ZnO/chitosan hydrogel with fast and efficient photocatalytic removal of congo red under solar light irradiation”的研究論文被中科院TOP期刊《International Journal of Biological Macromolecules》接收。蔣茹博士為該論文的第一作者，臺(tái)州學(xué)院環(huán)境工程系為該論文的第一署名單位和通訊單位。International Journal of Biological Macromolecules主要聚焦于生物大分子改性、表征以及在環(huán)境、制藥、食品等領(lǐng)域應(yīng)用，2020年影響因子為5.162，中科院SCI期刊分區(qū)（ 2020年12月最新升級(jí)版）為化學(xué)類(lèi)TOP二區(qū)期刊。
本研究以具有大量氨基功能基團(tuán)的天然生物高分子殼聚糖為基體，再將納米ZnO分散到殼聚糖體系內(nèi)得到n-ZnO/CS；通過(guò)螯合合作將Cd2+離子吸附在n-ZnO/CS，得到Cd2+@n-ZnO/CS；最后通過(guò)硫脲中溫釋放S2-與Cd2+@n-ZnO/CS反應(yīng)得到CdS@n-ZnO/CS凝膠體系。以剛果紅（CR）為目標(biāo)有機(jī)污染物，CdS@n-ZnO/CS凝膠體系在太陽(yáng)光照射下對(duì)CR進(jìn)行了光降解實(shí)驗(yàn)。研究表明，污染物初始濃度為5.0 mg/L時(shí)，CdS@n-ZnO/CS凝膠體系能1min內(nèi)去除95%CR染料；污染物初始濃度為100.0 mg/L時(shí)，CdS@n-ZnO/CS凝膠體系能30min內(nèi)去除94.34%染料。與非凝膠狀態(tài)材料相比，CdS@n-ZnO/CS凝膠體系降解污染物速度更快、效果更好。實(shí)驗(yàn)證實(shí)，CdS@n-ZnO/CS凝膠體系在自然太陽(yáng)光照射下也能有效降解CR有機(jī)染料，這表明CdS@n-ZnO/CS凝膠體系有望在實(shí)際廢水處理中得到應(yīng)用。
本研究得到國(guó)家自然科學(xué)基金（51208331）、浙江省自然科學(xué)基金（LTY21B070001、LY15E080002、LY14b070011）和臺(tái)州學(xué)院杰出青年科學(xué)基金（2018JQ001）的資助。
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 and 94.34 % of CR was removed in 30 min for 100 mg/L. CdS@n-ZnO/CS exhibited an excellent and ultra-fast performance t oward 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.
論文鏈接網(wǎng)址為：https://authors.elsevier.com/sd/article/S0141-8130(21)00108-2