Hydrogen Peroxide Stability in Silica Hydrogels

作者：Sudur Fulya; Pleskowicz Brian; Orbey Nese^*

来源：Industrial & Engineering Chemistry Research, 2015, 54(6): 1930-1940.

DOI：10.1021/ie504850n

Hydrogen peroxide (H2O2) entrapment in silica hydrogels has potential to be used in various industrially important applications to increase H2O2 stability. In this study, optimum conditions for hydrogel formation and H2O2 stability were determined by varying the sodium content and initial H2O2 concentration. Higher retention and better stability of H2O2 were achieved with hydrogels at room temperature at low sodium concentration. Retention values of 89% were obtained with initial H2O2 concentrations up to 10 wt %. H2O2 decomposition in hydrogels followed a first-order reaction. Hydrogels were characterized by measuring their surface area, pore size, and pore size distribution by BrunauerEmmettTeller analysis and scanning electron microscopy. Mesoporous (324 nm) hydrogels with high surface area (10001400 m(2)/g) were obtained. In addition, the melting point of the entrapped H2O2-water mixture in the hydrogels was studied by low temperature differential scanning calorimetry.

• 出版日期2015-2-18