Selective reduction of NO3− to N2using a highly stable Cu0/Cu2O-PANI-CNTs as a photocatalyst at neutral pH

光催化 聚苯胺 选择性 氮氧化物 碳纳米管 化学 化学工程 聚合 亚硝酸盐 无机化学 催化作用 氧化物 氮气 光化学 硝酸盐 材料科学 纳米技术 聚合物 有机化学 工程类 燃烧
作者
Li Cai,Xuemei Zhang,Qian Wang,Yong Liu
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:475: 146261-146261 被引量:7
标识
DOI:10.1016/j.cej.2023.146261
摘要

The selective photoreduction of nitrate (NO3−) to nitrogen (N2) has emerged as an energy-efficient and environmentally friendly NO3− removal route under mild conditions. However, NO3− photoreduction often suffers low NO3− removal efficiency in the absence of hole scavengers at neutral pH, the generation of undesired side products (nitrite (NO2−), ammonium (NH4+), nitrogen oxides (NOx), etc.) and poor photocatalyst stability. In this study, a novel copper/copper(I) oxide-polyaniline-carbon nanotubes (Cu0/Cu2O-PANI-CNTs) photocatalyst was prepared through a combination of in situ polymerization and liquid phase reduction processes and used to reduce NO3− to N2. In the Cu0/Cu2O-PANI-CNTs/hv system, NO3− was reduced to NO2− by photogenerated electrons (ecb−) on the surface of Cu0/Cu2O, and the generated NO2− was further reduced to N2 by PANI, resulting in high N2 selectivity. –NH– in PANI acted as photogenerated hole (hvb+) capture centres, leading to NO3− photoreduction without additional hole scavengers. Given the interaction between Cu0, ecb− and PANI, Cu0/Cu2O-PANI-CNTs show excellent repeatability. A 100% NO3− removal efficiency and 100 % N2 selectivity could be achieved by the Cu0/Cu2O-PANI-CNTs/hv system at neutral pH. With river water, secondary effluent and the fourth reuse of the catalyst, the NO3− removal efficiencies were as high as 93.0%, 91.2% and 84.4%, respectively, with 100 % N2 selectivity.
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