Carbonaceous biomass-titania composites with Ti O C bonding bridge for efficient photocatalytic reduction of Cr(VI) under narrow visible light

Djellabi, Ridha; Yang, Bo; Wang, Yan; Cui, Xiaoqing; Zhao, Xu

doi:10.1016/j.cej.2019.02.035

Cited by 129 publications

(65 citation statements)

References 68 publications

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“…The synthesis route for BCPs has great influence on photocatalytic performance. Various efficient methods and approaches have been reported for the synthesis of BCPs (summarized in Table 1), including sol-gel [28][29][30][31][32]43,44], hydrothermal/solvothermal [36,38,39,[45][46][47][48][49][50][51][52][53], ultrasound [40,41,54,55], calcination [34,[56][57][58] and in situ methods [35,59], etc.…”

Section: Synthesismentioning

confidence: 99%

“…Carbon can expand the absorbance range to the visible region [74]. The BCPs showed a red-shift toward longer wavelengths when semiconductors were combined with BC to form the composites [40,41]. However, the absorbance was relatively weak in the visible region because of the low content of BC [43].…”

Section: Optical Property and Stabilitymentioning

confidence: 99%

“…In recent years, biochar-based photocatalysts (BCPs) have received great attention in various environmental fields [23][24][25][26][27]. Some of those recently reported BCPs were TiO 2 -coconut shell [28], TiO 2 -Salvinia molesta [29], TiO 2 -reed straw [30], TiO 2 -ramie char [31], TiO 2 -corn cob [32], TiO 2 -paper sludge and wheat husks [33], TiO 2 -bamboo [34,35], ZnO-waste biomass [36], g-C 3 N 4 /FeVO 4 -pinus roxbu rghii [37], Bi 2 O 3 -corn cobs [38], TiO 2 -walnut shells [39], TiO 2 -olive pits and TiO 2 -wood shaving [40], TiO 2 -wood pellets [41], and TiO 2 -plum stones [42], etc.…”

Section: Introductionmentioning

confidence: 99%

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Recent Progress in Biochar-Based Photocatalysts for Wastewater Treatment: Synthesis, Mechanisms, and Applications

Cui

Zhang

et al. 2020

Applied Sciences

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Biochar (BC) is a carbon-rich material produced from pyrolysis of biomass. In addition to its low toxicity, environmental compatibility, and low cost, BC has the desired advantages of well-developed mesoporous structure and abundant surface functional groups. In recent years, BC-based photocatalysts (BCPs) have played a significant role in many environmental fields. In this paper, we highlight the current progress and several exciting results of BCPs by focusing on their synthesis, characterization, mechanisms, and applications in wastewater treatment. Details on various preparation methods include sol–gel, hydrothermal/solvothermal, ultrasound, calcination, and in situ methods are summarized and discussed. The underlying mechanisms and the applications of BCPs for different semiconductors are reviewed. Furthermore, some future trends and potentials are outlined.

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Section: Synthesismentioning

confidence: 99%

Section: Optical Property and Stabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recent Progress in Biochar-Based Photocatalysts for Wastewater Treatment: Synthesis, Mechanisms, and Applications

Cui

Zhang

et al. 2020

Applied Sciences

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“…In this sense, previous studies focused on the immobilization of titanium dioxide (TiO 2 ) onto a precursor like biochar, thus in the literature different biochars such as walnut shell, 7 reed straw, 8 coconut shell, 9 corn cob, 10 Salvinia molesta, 11 activated carbon-TiO 2 , olive pits-TiO 2 and wood shaving-TiO 2 , 12 ramie bars, 13 softwood pellets and miscanthus straw pellets, 14 sugarcane bagasse, 15 and bamboo 16 have been used. In fact, TiO 2 /walnut shell was capable to discolor 96% and mineralize 83% of a 20 mg L −1 methyl orange solution in 150 min.…”

Section: Introductionmentioning

confidence: 99%

Preparation of TiO₂ supported on MDF biochar for simultaneous removal of methylene blue by adsorption and photocatalysis

Silvestri

Stefanello

Sulkovski

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND This article reports for the first time the preparation and characterization of biochar/titanium dioxide (TiO2) composites by pyrolysis from medium‐density fiberboard (MDF) biomass. Their adsorptive and photocatalytic activities were evaluated by removal of methylene blue (MB) dye from aqueous solutions with and without UV‐light irradiation. RESULTS Characterization results suggested that the composite have different intrinsic characteristics in relation to the precursors. The biochar and TiO2 amounts of the composite significantly affected its performance. The MB removal efficiency with 1 g L−1 of the composite with 10% w/w TiO2 (B10T sample) was 2.3 and 2.2 times faster than that the B5T and B1T samples, respectively, and 1.5 times faster than TiO2 alone. CONCLUSION The loading of TiO2 significantly enhanced the adsorption performance of the composite and factors such as specific surface area, pore volume and pore size of the biochar synergistically promoted the photocatalytic activity of TiO2, coupled with a lower band gap for all composites produced. Both adsorption and photocatalytic efficiencies were confirmed to contribute to the degradation of the aqueous solution of MB by the hydroxyl radical (•OH) in lower molecular mass by‐products. The synthesized composite is a promising alternative sustainable material for removing chemical contaminants, since the biochar used as a support comes from the waste of the furniture industry. © 2019 Society of Chemical Industry

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“…On the basis of the spectral behavior and of the literature data [36,37], the former broad peak can be After outgassing at RT (Fig. 2, red lines) physisorbed water molecules are removed and, as a consequence, the absorbance of the envelope related to H-bonded OH groups decreases significantly.…”

Section: Characterization Of the Titania Powdersmentioning

confidence: 78%

Nano- versus Micro-sized TiO<sub>2</sub>: Comparative Photoelectrochemical and Photocatalytic Studies towards Organic Pollutants Oxidation in Gas Phase

Bianchi¹,

Fernández²,

Djellabi³

et al. 2020

Preprint

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The size of TiO2 (either nanometric or micrometric) can significantly affect both its photocatalytic and photoelectrochemical properties, thus altering the photooxidation of organic pollutants in air or water. The purpose of this work is to give an account of the photoelectrochemical and photocatalytic features of some nano- and micro-sized TiO2 commercial powders towards a model reaction, the photooxidation of acetone. Cyclic voltammograms (CV) of TiO2 particulated electrodes under UV illumination experiments were carried out in either saturated O2 or N2 solutions for a direct correlation with the photocatalytic process. In addition, the effect of different reaction conditions on the photocatalytic efficiency under UV light in both aqueous and gaseous phases was also investigated. CV curves with the addition of acetone under UV light showed a negative shift of the photocurrent onset, confirming the efficient transfer of photoproduced reactive oxygen species (ROSs), e.g., hydroxyl radicals, or holes to acetone molecules. The photocatalytic experiments showed that the two nano-sized samples exhibit the best photocatalytic performance. The different photoactivity of the micro-sized samples is probably attributed to their morphological differences, affecting both the amount and distribution of free ROSs involved in the photooxidation reaction.

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Carbonaceous biomass-titania composites with Ti O C bonding bridge for efficient photocatalytic reduction of Cr(VI) under narrow visible light

Cited by 129 publications

References 68 publications

Recent Progress in Biochar-Based Photocatalysts for Wastewater Treatment: Synthesis, Mechanisms, and Applications

Recent Progress in Biochar-Based Photocatalysts for Wastewater Treatment: Synthesis, Mechanisms, and Applications

Preparation of TiO₂ supported on MDF biochar for simultaneous removal of methylene blue by adsorption and photocatalysis

Nano- versus Micro-sized TiO<sub>2</sub>: Comparative Photoelectrochemical and Photocatalytic Studies towards Organic Pollutants Oxidation in Gas Phase

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Carbonaceous biomass-titania composites with Ti O C bonding bridge for efficient photocatalytic reduction of Cr(VI) under narrow visible light

Cited by 129 publications

References 68 publications

Recent Progress in Biochar-Based Photocatalysts for Wastewater Treatment: Synthesis, Mechanisms, and Applications

Recent Progress in Biochar-Based Photocatalysts for Wastewater Treatment: Synthesis, Mechanisms, and Applications

Preparation of TiO2 supported on MDF biochar for simultaneous removal of methylene blue by adsorption and photocatalysis

Nano- versus Micro-sized TiO<sub>2</sub>: Comparative Photoelectrochemical and Photocatalytic Studies towards Organic Pollutants Oxidation in Gas Phase

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Preparation of TiO₂ supported on MDF biochar for simultaneous removal of methylene blue by adsorption and photocatalysis