用过的选择性催化还原催化剂绿色回收钛和有效再生TiO <sub>2</sub>光催化剂,ACS Sustainable Chemistry & Engineering

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用过的选择性催化还原催化剂绿色回收钛和有效再生TiO ₂光催化剂
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-01-12 00:00:00 , DOI: 10.1021/acssuschemeng.7b03038
Qijun Zhang ₁ , Yufeng Wu ₁ , Tieyong Zuo ₁

Affiliation

选择性催化还原（SCR）催化剂的广泛使用将提供许多废SCR催化剂。废SCR催化剂中钛组分的质量分数超过80％，但目前，通常不进行适当回收就将其丢弃。这项工作旨在开发一种清洁，绿色，经济的方法，该方法可基于钛组分的转化从废SCR催化剂中回收钛并再生TiO ₂光催化剂。此钛组分被转化成亚稳态α-的Na ₂的TiO ₃NaOH熔盐法高效（> 98％），最佳条件是焙烧温度为550°C，NaOH与废SCR催化剂的质量比为1.8：1，焙烧时间为10分钟，NaOH浓度为60-80 wt％。并提出了可能的化学反应机理。随后的水热处理α-的Na ₂的TiO _3个回收物的TiO _2个光催化剂具有高纯度（> 99.0％），其能满足商业要求。另外，废SCR催化剂中包含的本铁元素被掺杂到再生的TiO ₂光催化剂中，从而提供可见光驱动的光催化活性。再生TiO ₂光催化剂对染料污染物具有优异的光催化降解能力，可用于有效处理废水。这项工作介绍了一种从废SCR催化剂中循环再生钛的有前途的技术。

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Green Recovery of Titanium and Effective Regeneration of TiO2 Photocatalysts from Spent Selective Catalytic Reduction Catalysts

The extensive use of selective catalytic reduction (SCR) catalysts will afford many spent SCR catalysts. The mass fraction of the titanium component is over 80% in spent SCR catalysts, but currently, it is usually thrown away without proper recycling. This work aims to develop a clean, green, and economical approach to recovering titanium and regenerating TiO₂ photocatalysts from spent SCR catalysts based on the conversion of the titanium component. This titanium component is converted into metastable α-Na₂TiO₃ with high efficiency (>98%) using a NaOH molten salt method, and the optimal conditions were found to be a roasting temperature of 550 °C, a NaOH-to-spent-SCR-catalysts mass ratio of 1.8:1, a roasting time of 10 min, and a NaOH concentration of 60–80 wt %. And a possible chemical reaction mechanism is proposed. A subsequent hydrothermal treatment of α-Na₂TiO₃ regenerates TiO₂ photocatalysts with high purity (>99.0%) that can satisfy commercial requirements. In addition, the present iron element contained in spent SCR catalysts is doped into regenerated TiO₂ photocatalysts, resulting in providing visible-light-driven photocatalytic activities. The regenerated TiO₂ photocatalysts possess superior photocatalytic degradation capacities for dye pollutants and can be used to efficiently treat wastewater. This work introduces a promising technology for the cyclical regeneration of titanium from spent SCR catalysts.

更新日期：2018-01-12

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