Paper Industry Innovation Center of Ehime University, Shikokuchuo, Japan.
Graduate School of Integrated Arts and Sciences, Kochi University, Kochi, Japan.
Environ Sci Pollut Res Int. 2018 Oct;25(29):29017-29025. doi: 10.1007/s11356-018-2909-y. Epub 2018 Aug 14.
The removal of antibiotic sulfamethazine (SMT) and its intermediates from water was investigated using a rotating advanced oxidation contactor (RAOC) equipped with TiO-high-silica zeolite composite sheets. SMT was readily removed from water through adsorption onto high-silica zeolite and photocatalytic decomposition by TiO inside the composite sheet. Some degradation intermediates were retained and photocatalytically decomposed inside the composite sheet. Relatively hydrophobic intermediates such as hydroxylated SMT were captured inside the sheets, whereas hydrophilic intermediates were distributed in water. This was attributed to the hydrophobic interactions in the adsorption mechanism of high-silica zeolite. The time courses of the NH, NO, and SO ion concentration during the RAOC treatment of SMT were evaluated. After treatment by RAOC for 24 h, approximately 94% of nitrogen derived from the amino and sulfanilamide groups and 39% of sulfur from the sulfanilamide group were mineralized, which indicated that the mineralization behavior of SMT treated by RAOC was different from that treated by TiO powder. These results strongly suggested that the dissociation of the amino group and cleavage of the sulfonamide group and subsequent dissociation of the amino group preferentially proceeded inside the composite sheets.
采用装填 TiO2-高硅沸石复合板的旋转式高级氧化接触器（RAOC）去除水中的抗生素磺胺甲噁嗪（SMT）及其中间产物。SMT 通过高硅沸石的吸附和复合板内的 TiO2 的光催化分解从水中被有效去除。一些降解中间产物被保留并在复合板内被光催化分解。相对疏水性的中间产物如羟化 SMT 被捕获在板内，而亲水性中间产物则分布在水中。这归因于高硅沸石吸附机制中的疏水相互作用。评价了 RAOC 处理 SMT 过程中 NH4+、NO3-和 SO42-离子浓度的时间进程。经过 RAOC 处理 24 h 后，来自氨基和磺胺基团的约 94%的氮和来自磺胺基团的 39%的硫被矿化，这表明 RAOC 处理 SMT 的矿化行为不同于 TiO2 粉末处理的矿化行为。这些结果强烈表明，氨基的解离、磺酰胺基团的断裂以及随后氨基的解离优先在复合板内进行。
