螺吡喃
化学
介孔二氧化硅
介孔材料
吸附
质子化
水溶液中的金属离子
解吸
吸附
无机化学
汞菁
脱质子化
离子交换
光致变色
金属
水溶液
光化学
离子
有机化学
催化作用
作者
Christopher T. Burns,Sung Yeun Choi,Mark L. Dietz,Millicent A. Firestone
标识
DOI:10.1080/01496390802122311
摘要
Abstract Abstract An acidichromic silyl spiropyran was synthesized and covalently immobilized on the surface of mesoporous silica (SBA-15) through either post-modification or a co-condensation route. The integration of the spiropyran into the porous silica was probed by thermogravimetric analysis, nitrogen adsorption/desorption studies and UV-Vis optical spectroscopy. While the co-condensation route provides the higher spiropyran loading levels, it also leads to two different states of attachment. Both synthetic procedures favor the formation of the open, merocyanine form of the spiropyran within the framework, but this form can be readily switched from a protonated to a deprotonated state by treatment with buffered aqueous solutions. Preliminary evaluation of the metal ion sorption capabilities of the spiro-functionalized SBA-15 for selected monovalent, divalent, and trivalent metal ions indicates that the spiropyran-modified materials show modestly improved cation exchange characteristics versus the unfunctionalized mesoporous framework. Keywords: acidichromicmesoporous silica ACKNOWLEDGMENTS The authors acknowledge the help of Drs. Byeongdu Lee and Sönke Seifert in the SAXS characterization of the mesoporous powders. This work was performed under the auspices of the Office of Basic Energy Sciences, Divisions of Material Sciences, United States Department of Energy, under contract number DE-AC02-06CH11357.
科研通智能强力驱动
Strongly Powered by AbleSci AI