Photooxidative degradation of dye pollutants accumulated in self-assembled natural polyelectrolyte microshells under visible radiation.
Photooxidative degradation of dye pollutants accumulated in self-assembled natural polyelectrolyte microshells under visible radiation.
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DOI：
10.1002/chem.200501454
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发表时间：
2006-05
期刊：
影响因子：
--
通讯作者：
Xia Tao;Jingmei Su;Jianfeng Chen
中科院分区：
文献类型：
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作者：
Xia Tao;Jingmei Su;Jianfeng Chen
报道了一种新的促进染料污染物降解的途径，染料污染物是一类著名的难降解有机污染物。这种新的方法是基于一种天然的微壳，该微壳是由阴离子海藻酸钠（ALG）和阳离子壳聚糖（CHI）交替吸附到弱交联的三聚氰胺甲醛（MF）胶体颗粒上，并随后在0.1 M HCl中牺牲MF模板而形成的。该微壳在普通条件下通过简单的混合过程可在水中高效富集罗丹明B（RhB）和荧光素（Flu）。在可见光照射下，在Fe 3+和H2O2的存在下，检测累积的RhB和Flu的光降解。在整个光反应过程中，积累的RhB和Flu迅速降解，组装的壳保持其完整的球形。循环降解实验和壳的光化学行为的结果，如通过共聚焦激光扫描显微镜（CLSM），紫外可见光谱，和扫描力显微镜（SFM）所示，进一步表明，构建的壳可用作环境友好的微容器，用于消除废水中的染料。
A novel route to facilitate the degradation of dye pollutants, a class of well-known recalcitrant organic pollutants, is reported. This new approach is based on a natural polyelectrolyte microshell that was preformed by the alternate adsorption of the anionic alginate sodium (ALG) and the cationic chitosan (CHI) onto weakly cross-linked melamine formaldehyde (MF) colloidal particles, and the subsequent sacrifice of MF templates in 0.1 M HCl. The as-prepared microshells could accumulate rhodamine B (RhB) and fluorescein (Flu) efficiently in water under ordinary conditions by means of a simple mixing process. The photodegradation of the accumulated RhB and Flu was examined in the presence of Fe3+ and H2O2 under visible radiation. The accumulated RhB and Flu are rapidly degraded and the assembled shells maintain their intact spherical shape throughout the photoreaction process. Results of recycling degradation experiments and the photochemical behavior of the shells, as demonstrated by confocal laser scanning microscopy (CLSM), UV-visible spectroscopy, and scanning force microscopy (SFM), further suggest that the constructed shells may be used as environmentally friendly microcontainers for the elimination of dyes in wastewater.