Selective reduction of nitrate to N2 using ilmenite as a low cost photo-catalyst

Zazo, Juan A.; García‐Muñoz, Patricia; Pliego, Gema; Silveira, Jefferson E.; Jaffé, Peter R.; Casas, J.A.

doi:10.1016/j.apcatb.2020.118930

Cited by 24 publications

(15 citation statements)

References 33 publications

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“…Photocatalytic technology can effectively remove the toxic constituents in the environment, such as organic dyes and bacterias, which has been regarded as an ecofriendly strategy for nitrate reduction. 148,149 Recently, breakthroughs have been made in the research of nitrate reduction via the photocatalytic route. For example, a novel Pd/GdCrO 3 composite material was prepared and used as the photocatalyst to carry out photocatalytic nitrate reduction reaction (Figure 12A).…”

Section: Photocatalytic Nitrate Reductionmentioning

confidence: 99%

Section: Conversion Between Nitrogen and Nitrogen Oxidesmentioning

confidence: 99%

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Rational design on photo(electro)catalysts for artificial nitrogen looping

Liu

Wang

et al. 2021

EcoMat

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Nitrogen, one of most important elements on the Earth, plays an essential role in shaping the modern society. The natural nitrogen looping, however, is insufficient to satisfy the high demand of the large-scale human activities. To achieve a more sustainable and efficient utilization of nitrogen, artificial nitrogen looping by photo(electro)catalytic processes has been considered as a feasible strategy. In this context, the rational design on the high-performance catalysts for nitrogen looping becomes increasingly important and urgent. On this basis, herein, we provide a timely review on the recent progress, achievements, and essential challenges for the artificial nitrogen looping process, mainly including photo(electro)catalytic transformations among dinitrogen, ammonia, gaseous nitrogen oxides, nitrate, and so on. Especially, the photo(electro)catalysts used in various reactions involved in nitrogen looping, including nitrogen reduction reaction, nitrogen oxidation reaction, ammonia oxidation reaction, ammonia decomposition reaction, etc., are systematically introduced. Finally, we hope that this review will help us deepen the understanding of nitrogen looping-related photo(electro)catalysts, and further pave a way toward the sustainable development on energy and environment. K E Y W O R D Senvironmental protection, nitrogen looping, photo(electro)catalysis, sustainable energy Mengying Li and Xiaoqing Liu contributed equally to this study.

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Section: Photocatalytic Nitrate Reductionmentioning

confidence: 99%

Section: Conversion Between Nitrogen and Nitrogen Oxidesmentioning

confidence: 99%

Rational design on photo(electro)catalysts for artificial nitrogen looping

Liu

Wang

et al. 2021

EcoMat

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“…However, most currently available photocatalysts fail to achieve a balance between a high efficiency and a low cost [ 7 , 8 ]. The modification of inexpensive, widely available photocatalysts to enhance their photocatalytic performances has become an important research direction for photocatalytic degradation technology [ 9 , 10 , 11 ]. TiO 2 is a non-toxic, non-hazardous, and low-cost photocatalyst with stable performance, but it exhibits poor photocatalytic performance, which must be enhanced to meet the needs of practical applications [ 12 , 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

In Situ Construction of Bronze/Anatase TiO2 Homogeneous Heterojunctions and Their Photocatalytic Performances

Zhang

Liu

et al. 2022

Nanomaterials

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Photocatalytic degradation is one of the most promising emerging technologies for environmental pollution control. However, the preparation of efficient, low-cost photocatalysts still faces many challenges. TiO2 is a widely available and inexpensive photocatalyst material, but improving its catalytic degradation performance has posed a significant challenge due to its shortcomings, such as the easy recombination of its photogenerated electron–hole pairs and its difficulty in absorbing visible light. The construction of homogeneous heterojunctions is an effective means to enhance the photocatalytic performances of photocatalysts. In this study, a TiO2(B)/TiO2(A) homogeneous heterojunction composite photocatalyst (with B and A denoting bronze and anatase phases, respectively) was successfully constructed in situ. Although the construction of homogeneous heterojunctions did not improve the light absorption performance of the material, its photocatalytic degradation performance was substantially enhanced. This was due to the suppression of the recombination of photogenerated electron–hole pairs and the enhancement of the carrier mobility. The photocatalytic ability of the TiO2(B)/TiO2(A) homogeneous heterojunction composite photocatalyst was up to three times higher than that of raw TiO2 (pure anatase TiO2).

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“…Pd/GdCrO 3 exhibited faster nitrate reduction and higher selectivity for N 2 due to the negative conduction band energy level and the co-catalyst effect of Pd, 67 while FeTiO 3 was characterized by negligible NH 4 + formation (i.e., it exhibited a remarkably high selectivity for N 2 ) without the need for complex and expensive catalysts. 68 KTaO 3 effectively promoted the photocatalytic reduction of NO 3 À to NO 2 À , N 2 , and NH 3 under UV light irradiation even in the absence of co-catalysts or reducing reagents such as organic compounds. 69 Layered double hydroxides (LDHs) with hydrotalcite-like structures are some of the interesting materials due to their unique properties such as anions intercalated in 2D interlayer spaces, a bunch of surface hydroxyl groups, exibility to change elements, and swelling nature, where divalent (e.g., Mg, Co, Ni, Cu, and Zn) and trivalent (e.g., Al, Cr, Ni, and Ga) metal cations are combined.…”

mentioning

confidence: 98%

“…Sacricial reagents were demonstrated to promote the efficient removal of holes and thus reduce charge carrier recombination while being oxidized 34 to afford strongly reducing (À1.81 vs. SHE) carboxyl radicals (CO 2 c À ), which also resulted in activity enhancement. 79 The most common sacricial reagents are organic compounds such as formic acid, 21,80,81 oxalic acid, 68,82,83 humic acid, 84 and methanol. 34 Among them, formic acid is the best hole scavenger for NO 3 À reduction, as its simple structure results in the exclusive formation of the strongly reducing CO 2 c À , while the release of protons promotes efficient N 2 -selective reduction.…”

mentioning

confidence: 99%