Ultrafine TiO2 encapsulated in nitrogen-doped porous carbon framework for photocatalytic degradation of ammonia gas

Li, Yanan; Chen, Zhaoyang; Bao, Shu‐Juan; Wang, Minqiang; Song, Chunlin; Pu, Shihua; Long, Dingbiao

doi:10.1016/j.cej.2017.08.119

Cited by 47 publications

(18 citation statements)

References 32 publications

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“…Many researchers have attempted to modify the photocatalysts (particularly TiO 2 based) and investigate the influential experimental parameters to boost ammonia oxidation efficiency and N 2 selectivity. For instance, titania, as the most commonly studied and used photocatalyst due to its abundance, nontoxicity, chemical stability, and excellent UV-light activity, was specifically investigated by loading noble metals, − controlling solution pH and catalyst concentration, − and solid support immobilization. − In addition, some new visible light photocatalysts have also been developed for ammonia oxidation. − …”

Section: Photocatalytic Oxidation Of Ammoniamentioning

confidence: 99%

“…The adsorption of the free ammonia molecule onto the TiO 2 photocatalyst is crucial for the subsequent PC oxidation. − To enhance the heterogeneous adsorption of ammonia or enrichment of ammonia from bodies of water into the vicinity of TiO 2 reaction sites, immobilization of TiO 2 based photocatalyst onto some porous solid supports was adopted. For example, TiO 2 was immobilized onto solid supports such as perlite granules, zeolite, clay aggregate, hollow silica, and nitrogen doped carbon framework. − These solid supports normally have a larger surface area, pore volume, and low density, which can improve the adsorption of NH 4 /NH 3 .…”

Section: Photocatalytic Oxidation Of Ammoniamentioning

confidence: 99%

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Recent Advances on Photocatalytic and Electrochemical Oxidation for Ammonia Treatment from Water/Wastewater

Zhang

Ruan

2020

ACS EST Eng.

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Heterogeneous photocatalytic (PC) and electrochemical (EC) oxidation of ammonia/ammonium pollutants in water/wastewater have been thoroughly investigated for ammonia abatement from aqueous streams, as there are continuing needs for developing alternative on-site easily controllable treatment approaches in contrast to conventional methods. Depending on the contamination level, water matrix characters, and regulatory consideration, the PC and EC oxidation of wastewater pollutants or integration with other treatment processes exhibit their own advantages and disadvantages at specific conditions. The PC oxidation of ammonia primarily relies on in situ generated strong oxidants such as hydroxyl radicals and holes, but their reactivities with ammonia are relatively slower at environmentally relevant pH conditions. In contrast, indirect EC oxidation of ammonia based on active chlorine species is more efficient and exhibits some advantages compared to the chemical chlorination approach. Although we have gained much scientific knowledge on this research topic in recent years, the research so far has not yet lead to broad industry adoption due to the many concerns about technical drawbacks and economic feasibilities; hence, it is necessary to reexamine the efforts made in this field. Upon survey of the recent literature, the aim of this review is to summarize and discuss the recent achievements and key issues on the PC and EC driven oxidation processes for ammonia abatement in order to avoid redundant studies that concentrate on well-established issues and point out the research directions to move these techniques forward in future.

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Section: Photocatalytic Oxidation Of Ammoniamentioning

confidence: 99%

Section: Photocatalytic Oxidation Of Ammoniamentioning

confidence: 99%

Recent Advances on Photocatalytic and Electrochemical Oxidation for Ammonia Treatment from Water/Wastewater

Zhang

Ruan

2020

ACS EST Eng.

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“…The superior catalytic performance of the MoS 2 −TiO 2carbon nanobelt composite compared with pristine TiO 2 can be attributed to the former's high specific surface, hierarchical pore network/structure, and effective separation of photogenerated charge carriers). 176 In a similar approach, a highly porous carbon framework containing nitrogen encapsulated with nano-TiO 2 (N−C−TiO 2 ) exhibited considerably enhanced photocatalytic performance in the removal of NH 3 (g) from a hermetically sealed chamber 177 (Table 1). The enhanced catalytic performance of N−C−TiO 2 was higher compared with pristine TiO 2 in terms of rate constant (0.67 and 0.13 min −1 , respectively).…”

Section: Photocatalytic Removal Of Nh 3 In the Gaseous Phasementioning

confidence: 99%

“…Explanations for the superiority of the former can be sought from the generation of a Schottky barrier at the TiO 2 −N−C junction. 177 In addition, an N−C framework was suggested to block the agglomeration of TiO 2 nanoparticles while retarding e − −h + recombination. The N− C−TiO 2 composite maintained appreciable performance for four regeneration cycles.…”

Section: Photocatalytic Removal Of Nh 3 In the Gaseous Phasementioning

confidence: 99%

“…The N− C−TiO 2 composite maintained appreciable performance for four regeneration cycles. 177 Graphene-based materials have received widespread attention in the domain of photocatalysis in recent years owing to their high specific surface, favorable electron mobility, and light transmittance. 178−180 Reduced graphene oxide (rGO)-based materials and composites are effective sensors with favorable adsorption capabilities and strong interactions with target species, including NH 3 .…”

Section: Photocatalytic Removal Of Nh 3 In the Gaseous Phasementioning

confidence: 99%

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Photocatalytic Platforms for Removal of Ammonia from Gaseous and Aqueous Matrixes: Status and Challenges

et al. 2020

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The unbridled expansion of advanced agricultural and industrial facilities has led to the release of large amounts of ammonia (NH 3 ), one of the most pernicious malodorants. Photocatalytic approaches have attracted widespread attention as promising options to turn pollutants into environmentally benign end products under favorable operating conditions. Although most approaches rely on the titanium dioxide (TiO 2 ) structures, many other engineered photocatalytic materials can also be used to enhance overall efficiency and practicality of such systems. This Review provides a comprehensive overview of the available options for discrete mitigation of NH 3 in gaseous and aqueous matrixes. The performances of photocatalytic materials and systems are compared with respect to quantum and space-time yields. Special attention has been paid to the reaction mechanisms prevalent during photocatalytic removal of NH 3 in each medium coupled with the production of end products (e.g., hydrogen and nitrogen) through NH 3 splitting. The effects of process and operational variables (e.g., irradiation time, relative humidity, mode of operation, and environmental matrix type) on performance are also discussed along with the intrinsic properties of the applied materials (e.g., surface functional sites and structure). Existing obstacles, such as the formation of hazardous byproducts through complicated reaction pathways, are explored along with future challenges.

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Recent Advances on Porous Materials for Synergetic Adsorption and Photocatalysis

Wang

Tian

Han

et al. 2021

Energy & Environ Materials

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Porous photocatalysts are promising materials capable of simultaneously adsorbing and oxidizing/reducing target species, showing great potentials in environmental remediation and energy generation. This review offered a comprehensive overview of the recent progress in design, fabrication, and applications of porous photocatalysts, including carbon-based semiconductors, metal oxides/sulfides, metal-organic frameworks, and adsorbent-photocatalyst hybrids. The fundamental understanding of the structure-performance relationships of porous materials together with the in-depth insights into the synergetic effects between adsorption and photocatalysis was presented. The strategies to further improve the photocatalytic activity of porous photocatalysts were proposed. This review would provide references and outlooks of constructing efficient porous materials for adsorptive and photocatalytic removal of pollutants and energy production.

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Ultrafine TiO2 encapsulated in nitrogen-doped porous carbon framework for photocatalytic degradation of ammonia gas

Cited by 47 publications

References 32 publications

Recent Advances on Photocatalytic and Electrochemical Oxidation for Ammonia Treatment from Water/Wastewater

Recent Advances on Photocatalytic and Electrochemical Oxidation for Ammonia Treatment from Water/Wastewater

Photocatalytic Platforms for Removal of Ammonia from Gaseous and Aqueous Matrixes: Status and Challenges

Recent Advances on Porous Materials for Synergetic Adsorption and Photocatalysis

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