Gunathilake Chamila, Kadanapitiye Murthi S, Dudarko Oksana, Huang Songping D, Jaroniec Mietek
Department of Chemistry and Biochemistry, Kent State University , Kent, Ohio 44242, United States.
Chuiko Institute of Surface Chemistry NAS of Ukraine , 17, General Naumov Street, Kyiv, 03164, Ukraine.
ACS Appl Mater Interfaces. 2015 Oct 21;7(41):23144-52. doi: 10.1021/acsami.5b06951. Epub 2015 Oct 7.
Mesoporous silica materials with hydroxyphosphatoethyl pendant groups (POH-MS) were obtained by a two-step process: (1) block copolymer Pluronic P123-templated synthesis of mesoporous silica with diethylphosphatoethyl groups (DP-MS) by co-condensation of diethylphosphatoethyl triethoxysilane (DPTS) and tetraethylorthosilicate (TEOS) under acidic conditions and (2) conversion of diethylphosphatoethyl into hydroxyphosphatoethyl groups upon suitable treatment with concentrated hydrochloric acid. The DP-MS samples obtained by using up to 20% of DPTS featured hexagonally ordered mesopores, narrow pore size distribution and high specific surface area. Conversion of DP-MS to mesoporous silica with hydroxyphosphatoethyl groups (POH-MS) resulted in the enlargement of the specific surface area, total porosity, and microporosity. High affinity of hydroxyphosphatoethyl groups toward lead ions (Pb(2+)) makes the POH-MS materials attractive sorbents for lead ions, which is reflected by high lead uptake reaching 272 mg of Pb(2+) per gram of POH-MS. This study shows that the simple and effective co-condensation strategy assures high loading of P-containing groups showing high affinity toward lead ions, which is of great importance for removal of highly toxic lead ions from contaminated water.
具有羟基磷酸乙酯侧基的介孔二氧化硅材料（POH-MS）通过两步法制备：（1）在酸性条件下，通过二乙基磷酸乙酯三乙氧基硅烷（DPTS）和正硅酸四乙酯（TEOS）的共缩合，以嵌段共聚物Pluronic P123为模板合成具有二乙基磷酸乙酯基团的介孔二氧化硅（DP-MS）；（2）用浓盐酸进行适当处理后，将二乙基磷酸乙酯转化为羟基磷酸乙酯基团。使用高达20%的DPTS获得的DP-MS样品具有六方有序的介孔、窄孔径分布和高比表面积。将DP-MS转化为具有羟基磷酸乙酯基团的介孔二氧化硅（POH-MS）导致比表面积、总孔隙率和微孔率增大。羟基磷酸乙酯基团对铅离子（Pb(2+)）具有高亲和力，这使得POH-MS材料成为有吸引力的铅离子吸附剂，这体现在每克POH-MS对铅的高吸附量达到272毫克Pb(2+)。本研究表明，简单有效的共缩合策略确保了对铅离子具有高亲和力的含磷基团的高负载量，这对于从受污染水中去除剧毒铅离子非常重要。
