TiO $_2$纳米管上模板脱湿Au光催化还原和清除Hg（II）
Photocatalytic reduction and scavenging of Hg(II) over templated-dewetted Au on TiO$_2$ nanotubes
摘要：
金修饰的TiO $_2$纳米管用于光催化降解水溶液中的Hg（II）。相对于裸TiO $_2$，去湿Au纳米粒子的存在诱导了光催化还原和清除性能的强烈增强。在氯化物的存在下，大量形成的Hg2Cl2纳米线，从金纳米粒子，观察到使用高Au负载的光催化剂处理10 ppm的Hg（II）的溶液。EDS和XPS证实了光产生的纳米线的性质。在不存在氯化物和/或在较低的Hg（II）起始浓度下，汞的清除通过形成Hg-Au汞齐进行。太阳光驱动的Hg（II）脱汞24小时后观察到高达90%。ICP-MS分析表明，被去除的Hg（II）积累在光催化剂表面上。负载汞的排气光催化剂的再生容易通过阳极剥离Hg（0）和Hg（I）至Hg（II）来进行。四个催化再生循环后，仅观察到活性降低10%。
英文摘要：
Gold-decorated TiO$_2$ nanotubes were used for the photocatalytic abatement of Hg(II) in aqueous solutions. The presence of dewetted Au nanoparticles induces a strong enhancement of photocatalytic reduction and scavenging performances, with respect to naked TiO$_2$. In the presence of chlorides, a massive formation of Hg2Cl2 nanowires, produced from Au nanoparticles, was observed using highly Au loaded photocatalysts to treat a 10 ppm Hg(II) solution. EDS and XPS confirmed the nature of the photo-produced nanowires. In the absence of chlorides and/or at lower Hg(II) starting concentrations, the scavenging of mercury proceeds through the formation of Hg-Au amalgams. Solar light driven Hg(II) abatements up to 90% were observed after 24h. ICP-MS analysis revealed that the removed Hg(II) is accumulated on the photocatalyst surface. Regeneration of Hg-loaded exhaust photocatalysts was easily performed by anodic stripping of Hg(0) and Hg(I) to Hg(II). After four catalytic-regeneration cycles only a 10% decrease of activity was observed.
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