School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, PR China.
School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, PR China.
J Hazard Mater. 2021 Aug 5;415:125649. doi: 10.1016/j.jhazmat.2021.125649. Epub 2021 Mar 17.
HCHO is the most concerned indoor air pollutant that photocatalytic degradation is a feasible approach. To achieve efficient and complete degradation of HCHO under visible light irradiation, heteroatoms are usually doped in TiO. But using natural materials as a dopant instead of expensive and toxic chemicals to fertilize TiO remains challenging. This paper proposes a sustainable and green approach to synthesize an efficient N, Ca co-doped TiO photocatalyst (TIMP) by using the insoluble matrix proteins (IMPs) extracted from abalone shell. TIMP-0.8 achieves near completely degradation HCHO within 45 min under visible light at ambient temperature and exhibits superior stability after 7 cycles. TIMP-0.8 has monodispersity with smaller diameter, high porosity, abundant defects and high adsorption affinity for surface hydroxyls compared with pure TiO. With the assistance of IMPs, the rate-determining step of HCHO degradation changes from -COOH oxidation to spontaneous decomposition of HCO, significantly facilitating the elimination and mineralization of HCHO. Overall, IMPs from abalone shell are natural surfactant, bio-templet, and dopant for TiO modification, contributing to desirable visible-light photocatalytic performance for HCHO degradation. This paper provides new insight for high-value utilization of waste shell and photocatalytic indoor purification.
HCHO 是最受关注的室内空气污染物，光催化降解是一种可行的方法。为了在可见光照射下实现 HCHO 的高效和完全降解，通常会在 TiO 中掺杂杂原子。但是，使用天然材料作为掺杂剂而不是昂贵且有毒的化学物质来修饰 TiO 仍然具有挑战性。本文提出了一种可持续的绿色方法，使用从鲍鱼壳中提取的不溶性基质蛋白（IMP）来合成高效的 N、Ca 共掺杂 TiO 光催化剂（TIMP）。TIMP-0.8 在环境温度下可见光照射下 45 分钟内几乎完全降解 HCHO，并在 7 次循环后表现出优异的稳定性。与纯 TiO 相比，TIMP-0.8 具有单分散性、更小的直径、高孔隙率、丰富的缺陷和对表面羟基的高吸附亲和力。在 IMPs 的辅助下，HCHO 降解的速率决定步骤从-COOH 氧化变为 HCO 的自发分解，显著促进了 HCHO 的去除和矿化。总体而言，鲍鱼壳中的 IMPs 是 TiO 修饰的天然表面活性剂、生物模板和掺杂剂，有助于实现 HCHO 降解的理想可见光光催化性能。本文为废物壳的高值化利用和室内光催化净化提供了新的见解。
