Hydrogen producing water treatment through mesoporous TiO2 nanofibers with oriented nanocrystals

Huang, Guocheng; Liu, Xueyan; Shi, Shuangru; Li, Sitan; Xiao, Zhengtao; Zhen, Weiqian; Liu, Shengwei; Wong, Po Keung

doi:10.1016/s1872-2067(19)63424-8

Cited by 49 publications

(13 citation statements)

References 56 publications

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“…On the basis of lab-scale experiments, the hydrogen reactor employs water, methanol, and light obtained from a sunlight simulator to produce hydrogen, and the photocatalytic setup is described elsewhere [ 55 ]. The catalyst is dispersed in water [ 34 ]. Methanol is used as a scavenging agent; however, it also results in further hydrogen generation (CH 3 OH + H 2 O → CO 2 + 3H 2 ) [ 56 ].…”

Section: Methodsmentioning

confidence: 99%

Safe-and-Sustainable-by-Design Framework Based on a Prospective Life Cycle Assessment: Lessons Learned from a Nano-Titanium Dioxide Case Study

Tsalidis

Soeteman‐Hernández

Noorlander

et al. 2022

IJERPH

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Safe-and-sustainable-by-design (SSbD) is a concept that takes a systems approach by integrating safety, sustainability, and functionality throughout a product’s the life cycle. This paper proposes a framework based on a prospective life cycle assessment for early safety and sustainability assessment. The framework’s purpose is to identify environmental sustainability and toxicity hotspots early in the innovation process for future SSbD applicability. If this is impossible, key performance indicators are assessed. Environmental sustainability aspects, such as global warming potential (GWP) and cumulative energy demand (CED), and toxicity aspects, such as human toxicity potential and freshwater ecotoxicity potential, were assessed upon applying the framework on a case study. The case study regarded using nano-titanium dioxide (P25-TiO2) or a modified nano-coated version (Cu2O-coated/P25-TiO2) as photocatalysts to produce hydrogen from water using sunlight. Although there was a decrease in environmental impact (GWP and CED), the modified nano-coated version had a relatively higher level of human toxicity and freshwater eco-toxicity. For the presented case study, SSbD alternatives need to be considered that improve the photocatalytic activity but are not toxic to the environment. This case study illustrates the importance of performing an early safety and environmental sustainability assessment to avoid the development of toxic alternatives.

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Section: Methodsmentioning

confidence: 99%

Safe-and-Sustainable-by-Design Framework Based on a Prospective Life Cycle Assessment: Lessons Learned from a Nano-Titanium Dioxide Case Study

Tsalidis

Soeteman‐Hernández

Noorlander

et al. 2022

IJERPH

View full text Add to dashboard Cite

show abstract

“…TiO2 has been researched widely in the fields of photocatalysis and photovoltaics [52][53][54][55][56][57][58][59][60]. In the photocatalytic HER processes, the separation and migration of photogenerated holes or electrons in TiO2 depend on the cocatalyst properties [54].…”

Section: Synthesis and Characterization Of Tio2-m-mo2cmentioning

confidence: 99%

Metal-doped Mo2C (metal = Fe, Co, Ni, Cu) as catalysts on TiO2 for photocatalytic hydrogen evolution in neutral solution

Liu

Hodes

Yan

et al. 2021

Chinese Journal of Catalysis

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The neutral hydrogen evolution reaction (HER) is vital in the chemical industry, and its efficiency depends on the interior character of the catalyst. Herein, work function (WF) engineering is introduced via 3d metal (Fe, Co, Ni, and Cu) doping for modulating the Fermi energy level of Mo2C. The defective energy level facilitates the free water molecule adsorption and, subsequently, promotes the neutral HER efficiency. Specifically, at a current density of 10 mA/cm 2 , Cu-Mo2C exhibits the best HER performance with an overpotential of 78 mV, followed by Ni-Mo2C, Co-Mo2C, Fe-Mo2C, and bare Mo2C with 90, 95, 100, and 173 mV, respectively, and the corresponding Tafel slope values are 40, 43, 42, 56, and 102 mV/dec. The modified WF can also lead to an enhanced photocatalytic efficiency owing to the lowered Schottky barrier and excellent carrier transition across the electrocatalyst-solution interface. When coupling the metal-doped Mo2C samples with TiO2, enhanced photocatalytic neutral HER rates are obtained in comparison to the case with bare TiO2. Typically, the HER rates are 521, 404, 275, 224, 147, and 112 μmol/h for Cu, Ni, Co, Fe, bare Mo2C, and bare TiO2, respectively. Time-resolved photoluminescence spectroscopy (TRPS) and ultrafast transient absorption (TA) measurements are carried out to confirm the recombination and migration of the photogenerated carriers. The fitted τ values from the TRPS curves are 22.

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“…Many studies use Ti-alkoxides and Ti-halides as TiO 2 precursors, but these are insoluble in water [65,89,[94][95][96][97][98]. TiO 2 nanofibers made from water-soluble precursors make it possible to combine TiO 2 with other metal oxides via water-soluble precursors [99]. At a voltage of 30 kV, nanofibers are electrodeposited, collected and dried at a temperature of 25 • C. Liu et al [100] fabricated silver (Ag) nanoparticle-decorated TiO 2 nanofiber (TiO 2 /Ag NF) membranes using the polyol synthesis mechanism.…”

Section: Tio 2 Nanofiber-based Membranesmentioning

confidence: 99%

Prospects of Synthesized Magnetic TiO2-Based Membranes for Wastewater Treatment: A Review

et al. 2021

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Global accessibility to clean water has stressed the need to develop advanced technologies for the removal of toxic organic and inorganic pollutants and pathogens from wastewater to meet stringent discharge water quality limits. Conventionally, the high separation efficiencies, relative low costs, small footprint, and ease of operation associated with integrated photocatalytic-membrane (IPM) technologies are gaining an all-inclusive attention. Conversely, photocatalysis and membrane technologies face some degree of setbacks, which limit their worldwide application in wastewater settings for the treatment of emerging contaminants. Therefore, this review elucidated titanium dioxide (TiO2), based on its unique properties (low cost, non-toxicity, biocompatibility, and high chemical stability), to have great potential in engineering photocatalytic-based membranes for reclamation of wastewater for re-use. The environmental pathway of TiO2 nanoparticles, membranes and configuration types, modification process, characteristics, and applications of IPMs in water settings are discussed. Future research and prospects of magnetized TiO2-based membrane technology is highlighted as a viable water purification technology to mitigate fouling in the membrane process and photocatalyst recoverability. In addition, exploring life cycle assessment research would also aid in utilizing the concept and pressing for large-scale application of this technology.

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Hydrogen producing water treatment through mesoporous TiO2 nanofibers with oriented nanocrystals

Cited by 49 publications

References 56 publications

Safe-and-Sustainable-by-Design Framework Based on a Prospective Life Cycle Assessment: Lessons Learned from a Nano-Titanium Dioxide Case Study

Safe-and-Sustainable-by-Design Framework Based on a Prospective Life Cycle Assessment: Lessons Learned from a Nano-Titanium Dioxide Case Study

Metal-doped Mo2C (metal = Fe, Co, Ni, Cu) as catalysts on TiO2 for photocatalytic hydrogen evolution in neutral solution

Prospects of Synthesized Magnetic TiO2-Based Membranes for Wastewater Treatment: A Review

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