Surfactant-assisted synthesis of Mo-doped TiO2/FAC (fly ash cenosphere) for degradation of methylene blue dye under visible light irradiation

Li, Guanghui; Mang, Changye; Xing, Lang; Cao, Pengxu; Cai, Yongfeng; Jiang, Hao

doi:10.1016/j.colsurfa.2022.129669

Cited by 11 publications

(5 citation statements)

References 52 publications

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“…S6C (ESI †), the evaluated values for TiO 2 and BiOBr-Cu 2+ are 3.40 eV and 2.56 eV respectively, which are close to the reported data. 44,45 E g = E VB À E CB (7) Thus, based on eqn ( 7), the conduction band potential (E CB ) of the BiOBr-Cu 2+ and TiO 2 are À0.34 eV and À1.60 eV, respectively. Based on the above results, the possible mechanism of the BiOBr-Cu 2+ /TiO 2 photocatalyst under solar light illumination in Fig.…”

Section: Photodegradation Mechanismmentioning

confidence: 99%

“…5 TiO 2 , the most extensively studied photocatalyst, has been limited in practical application due to its high photogenerated charge recombination rate and low visible light responsivity. 6 Many tactics have been proposed for overcoming these bottleneck issues of TiO 2 , such as doping metal 7 or non-metal elements, 8 surface modification, 9 and constructing heterojunctions with other narrow band-gap semiconductors. 10 Among these, the construction of heterojunctions has received significant attention from researchers due to the unique electron transfer at the interface improving the separation of photogenerated electrons and holes.…”

Section: Introductionmentioning

confidence: 99%

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Facile fabrication of a BiOBr–Cu²⁺/TiO₂ suspension for efficient equipment decontamination

et al. 2023

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Section: Photodegradation Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Facile fabrication of a BiOBr–Cu²⁺/TiO₂ suspension for efficient equipment decontamination

et al. 2023

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“…The treatment of industrial wastewater has emerged as an increasingly pressing issue. Among the organic pollutants present, methylene blue (MB), commonly utilized in chemical indicators, dyes, biological stains, and pharmaceuticals, has gained particular attention [1]. Its high solubility in water, substantial loss during production and use, and the persistent residue it leaves in the environment make its complete removal through conventional treatment methods challenging [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

A Novel Vermiculite/TiO2 Composite: Synergistic Mechanism of Enhanced Photocatalysis towards Organic Pollutant Removal

Han,

Yue,

Wen

et al. 2023

Molecules

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There has been increasing concern over water pollution, which poses a threat to human life and health. Absorption by low-cost absorbents is considered to be a cost-effective and efficient route. However, the non-reusability of absorbents greatly limits their applications. In this study, a novel vermiculite/TiO2 composite combining the inexpensive absorbent with the commonly used photocatalyst was firstly synthesized via the sol-gel method. On the one hand, the organic pollutants are absorbed by vermiculite and then decomposed through the photocatalysis process, enabling the next round of absorption and creating an absorption–decomposition reusable cycle. On the other hand, the modulation effect of optical and electronic structure on the prepared TiO2 photocatalyst by the vermiculite incorporation could significantly improve the photocatalytic activity and eventually enhance the aforementioned cyclic degradation capacity. The layer-structured vermiculite (Vt) supports a uniform coverage of TiO2 at an optimized ratio, providing an optimal adsorption environment and contact area between the photocatalyst and methylene blue (MB) molecules. Vt/TiO2 heterojunction is formed with Si-O-Ti bonding, at which electrons transfer from Vt to TiO2, enriching electron density in TiO2 and favoring its photocatalytic activity. Furthermore, the incorporation of Vt increases the light absorption of TiO2 in the visible range by narrowing the optical band gap to 1.98 eV, which could promote the generation of photo-excited carriers. In addition, PL measurements revealed that the carrier recombination is substantially suppressed, and the charge separation and migration are greatly enhanced by a factor of 3. As a result, the decomposition rate of MB is substantially increased 5.3-fold, which is ascribed to the synergistic effects of the elevated photocatalysis and the large absorption capacity governed by the chemisorption mechanism of the intra-particle diffusion. These results pave the way for composite design towards efficient, economical, and pragmatic water pollution treatment.

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“…8 In 2021, the global output of primary nickel was 2.79 million tons, with laterite accounting for more than 80% of the total output. 9 However, the major minerals and elements in different laterite strata are different due to the influence of long-term weathering. 10 The enrichment of nickel and cobalt in the nickel laterite ore through physical separation is inefficient because of its poor flotation properties.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Nickel is extracted from nickel sulfide ore, nickel laterite ore, and nickel-containing secondary resources as raw materials . In 2021, the global output of primary nickel was 2.79 million tons, with laterite accounting for more than 80% of the total output . However, the major minerals and elements in different laterite strata are different due to the influence of long-term weathering .…”

Section: Introductionmentioning

confidence: 99%

Near-Zero-Waste Approach for the Treatment of Saprolitic Nickel Laterite via a Combined Hydrometallurgical Process

Chen

Mang

et al. 2023

ACS Sustainable Chem. Eng.

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Atmospheric acid leaching can be used for processing the nickel laterite ore. The lixivium composition necessitates Fe 3+ separation as the first step in recovering valuable metals. However, traditional partial neutralization has the problem of significant loss of Ni 2+ and Co 2+ ions due to the high Fe 3+ concentration. Besides, the discharged acidic residue leads to environmental pollution. This study proposes a combined hydrometallurgical method for efficiently recovering valuable components from saprolitic laterite. After atmospheric sulfuric acid leaching, the Fe 3+ in the lixivium was first separated using phosphoric acid and sodium hydroxide as reagents; 92% of the Fe 3+ precipitated as iron phosphate at a pH of 1.8. The charge and discharge capacities of the LFP sample prepared from this iron phosphate at the rate of 1 C were 157 and 154 mA h/g, respectively. During the recovery of Fe 3+ ions, approximately 100% of other metals were retained in the aqueous solution. After adjustment of the pH to 6.0, this solution was used to remove impurities, including Al, Mn, Cr, and Fe. Then, more than 98% of Ni and Co were recovered as Ni,Co(OH) 2 precipitates at a pH of 8.0−9.0. When the pH was raised to 11.0, over 98% of Mg precipitated as Mg(OH) 2 . The leach residue with a high silica content was used to prepare calcium silicate hydrate (C−S−H) via a hydrothermal process. The recovery of FePO 4 , Mg(OH) 2 , and C−S−H, in addition to Ni,Co(OH) 2 , made this a value-added process and with a near-zero residue discharge.

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Surfactant-assisted synthesis of Mo-doped TiO2/FAC (fly ash cenosphere) for degradation of methylene blue dye under visible light irradiation

Cited by 11 publications

References 52 publications

Facile fabrication of a BiOBr–Cu²⁺/TiO₂ suspension for efficient equipment decontamination

Facile fabrication of a BiOBr–Cu²⁺/TiO₂ suspension for efficient equipment decontamination

A Novel Vermiculite/TiO2 Composite: Synergistic Mechanism of Enhanced Photocatalysis towards Organic Pollutant Removal

Near-Zero-Waste Approach for the Treatment of Saprolitic Nickel Laterite via a Combined Hydrometallurgical Process

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Surfactant-assisted synthesis of Mo-doped TiO2/FAC (fly ash cenosphere) for degradation of methylene blue dye under visible light irradiation

Cited by 11 publications

References 52 publications

Facile fabrication of a BiOBr–Cu2+/TiO2 suspension for efficient equipment decontamination

Facile fabrication of a BiOBr–Cu2+/TiO2 suspension for efficient equipment decontamination

A Novel Vermiculite/TiO2 Composite: Synergistic Mechanism of Enhanced Photocatalysis towards Organic Pollutant Removal

Near-Zero-Waste Approach for the Treatment of Saprolitic Nickel Laterite via a Combined Hydrometallurgical Process

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Facile fabrication of a BiOBr–Cu²⁺/TiO₂ suspension for efficient equipment decontamination

Facile fabrication of a BiOBr–Cu²⁺/TiO₂ suspension for efficient equipment decontamination