Reaction mechanism and selectivity regulation of photocatalytic nitrate reduction for wastewater purification: progress and challenges

Abstract

The excess emission of nitrate into wastewater is inevitable by the abundant use of fertilizers and other chemicals, which poses a huge threat to the environment and human health. Photocatalytic...

Catalytic conversion to ammonia through solid-state nitrate as a proposal for the emerging usage of nitrogen oxides

“…When the inlet gas is switched to H 2 , the solid-state NO 3 − species are converted to gaseous NH 3 with strong repulsion to basic AEM species and/or N 2 . Referring to the major formation routes to NH 3 and N 2 during electro- and photo-catalytic reduction of NO 3 − and NO 2 − species, 31,33 NO 3 − species are reduced to NO via NO 2 in the presence of protons (H + ) and further to NH 2 , NHO and NH 2 OH but they are often converted to N 2 in the presence of NO, HNO and NH 2 OH before reduction to NH 3 as the target chemical. From this viewpoint, we have to prevent the concentration of such intermediates during the reduction process near the Pt NP catalyst.…”

In Situ Growth of Perovskite on 2D Hydrothermal Carbonation Carbon for Photocatalytic Reduction of Nitrate to Ammonia

“…To date, photocatalytic nitrate reduction is recognized as a promising technology for removing pollutants in water on account of its high efficiency, low energy consumption, and wide applicability. , Tong et al described a PdSn/NiO/NaTaO 3 :La photocatalyst for the synthesis of NH 4 + with an aqueous solution of NO 3– and HCOOH under ultraviolet irradiation. Choi et al developed a zirconium-based metal organic framework called MOF nu-1000, which can convert nitrate photochemically into the ammonia ion.…”

“…3 To date, photocatalytic nitrate reduction is recognized as a promising technology for removing pollutants in water on account of its high efficiency, low energy consumption, and wide applicability. 4,5 Tong et al 6 described a PdSn/NiO/ NaTaO 3 :La photocatalyst for the synthesis of NH 4…”

Porifera-like nickel nanodendrite for the efficient electrosynthesis of C–N compounds from carbon dioxide and nitrate anions

“…43–45 Similarly, great efforts have been dedicated to enhancing the performance of Cu and Ni electrocatalysts for NtRR by tuning both their electronic and physical properties including morphology, facet, size and formation of alloys and composites with each other and other compounds. 46–49 Therefore, the modification of Cu or Ni with suitable facet exposure and selection of appropriate electrolytes including hydrogen carbonate (HCO 3 − ) and nitrate (NO 3 − ) play a critical role in improving the production of C 2 + and C–N compounds with high efficiency and low overpotential.…”

“…[43][44][45] Similarly, great efforts have been dedicated to enhancing the performance of Cu and Ni electrocatalysts for NtRR by tuning both their electronic and physical properties including morphology, facet, size and formation of alloys and composites with each other and other compounds. [46][47][48][49] Therefore, the modication of Cu or Ni with suitable facet exposure and selection of appropriate electrolytes including hydrogen carbonate (HCO 3 − ) and nitrate (NO 3 − ) play a critical role in improving the production of C 2 + and C-N compounds with high efficiency and low overpotential. Herein, we fabricated porifera-structured nickel nanodendrites (p-Ni NDs) consisting of abundant of pores and channels via a two-step process including a facile electrodeposition method to form CuNi bimetallic nanodendrites, and subsequent removal of Cu to form p-Ni NDs.…”