Enhanced photocatalytic degradation of lignin by In2S3 with hydrophobic surface and metal defects

Chen, Runlin; Huang, Yarong; Rao, C. N. R.; Su, Hang; Pang, Yuxia; Lou, Hongming; Yang, Dongjie; Qiu, Xueqing

doi:10.1016/j.apsusc.2022.154110

Cited by 23 publications

(16 citation statements)

References 63 publications

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“…However, the SAED pattern of the A/C-IS-3 displayed a diffraction ring composed of a blurred halo (Figure h), suggesting its amorphous structure . In addition, there are only two diffraction rings, representing the (2212) and (109) crystal planes, indicating a preferential growth of these two crystal planes . The mapping image of the A/C-IS-C3 (Figure S4) showed that the In, S, and C elements were evenly distributed on the catalyst before ethanol treatment, suggesting that CTA + was successfully introduced into the photocatalyst.…”

Section: Resultsmentioning

confidence: 99%

“…59 In addition, there are only two diffraction rings, representing the (2212) and (109) crystal planes, indicating a preferential growth of these two crystal planes. 60 The mapping image of the A/C-IS-C3 (Figure S4) showed that the In, S, and C elements were evenly distributed on the catalyst before ethanol treatment, suggesting that CTA + was successfully introduced into the photocatalyst. After stirring in ethanol for 24 h, the distribution of C element was inconsistent with the morphology, as shown in Figure 2i, suggesting that CTA + fell off from the surface of the A/C-IS and remained in a free state.…”

Section: Resultsmentioning

confidence: 99%

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Functionalized Regulation of Metal Defects in ln₂S₃ of p–n Homojunctions

et al. 2023

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The introduction of metal vacancies into n-type semiconductors could efficiently construct intimate contact interface p−n homojunctions to accelerate the separation of photogenerated carriers. In this work, a cationic surfactant occupancy method was developed to synthesize an indium-vacancy (V In )enriched p−n amorphous/crystal homojunction of indium sulfide (A/C-IS) for sodium lignosulfonate (SL) degradation. The amount of V In in the A/C-IS could be regulated by varying the content of added cetyltrimethylammonium bromide (CTAB). Meanwhile, the steric hindrance of CTAB produced mesopores and macropores, providing transfer channels for SL. The degradation rates of A/C-IS to SL were 8.3 and 20.9 times higher than those of crystalline In 2 S 3 and commercial photocatalyst (P25), respectively. The presence of unsaturated dangling bonds formed by V In reduced the formation energy of superoxide radicals ( • O 2 − ). In addition, the inner electric field between the intimate contact interface p−n A/C-IS promoted the migration of electron−hole pairs. A reasonable degradation pathway of SL by A/C-IS was proposed based on the above mechanism. Moreover, the proposed method could also be applicable for the preparation of p−n homojunctions with metal vacancies from other sulfides.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Functionalized Regulation of Metal Defects in ln₂S₃ of p–n Homojunctions

et al. 2023

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“…Chen and colleagues synthesized an optimal photocatalyst for lignosulfonate . Lignosulfonate’s degradation rate reached 90% within 30 min under visible light irradiation, which is almost 80 times higher than that of commercial photocatalysts like P25.…”

Section: Photocatalytic Reforming Of Lignin From the Perspective Of U...mentioning

confidence: 99%

Section: Photocatalytic Reforming Of Lignin From the Perspective Of U...mentioning

confidence: 99%

Review on Catalytic Cracking of Lignin for the Production of Fuels and High-Value-Added Chemicals: Advances, Challenges, Opportunities, and Outlook

Shen,

Xue,

Wang

et al. 2023

Energy Fuels

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Nowadays and in the future, environment and energy are important issues that people have to consider. In order to achieve energy sustainability and minimize the increase in environmental pressure, researchers have begun to gradually develop new ways of energy access. Biomass resource is a sustainable and efficient mode of energy supply, which has little impact on the environment. Among them, lignin is a rich organic compound in natural plants and is a promising biomass source. According to different forms of energy, different lignin catalytic cracking reactions can be used. This paper systematically summarizes the research progress of lignin catalytic cracking under different energy effects and focuses on the opportunities of lignin catalytic cracking at this stage. The challenges and future research directions of lignin catalytic cracking and directional conversion composite catalytic system are summarized and discussed. On this basis, a critical perspective based on experiment is proposed. It provides a richer catalytic model for the efficient conversion of lignin into fuel and high-value chemicals in the future. In conclusion, this Review offers insights into future directions for catalytic cracking of lignin through synergistic utilization of multiple energy sources.

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“…Lignin is an aromatic polymer consisting of three phenylpropane units connected in a disordered manner by C–C and C–O bonds and is the only renewable aromatic resource that exists in nature. − However, the underutilization and inherent resistance to biodegradation of lignin contribute to environmental pollution and the squandering of valuable renewable sources. , In recent years, many lignin depolymerization processes, including noncatalytic, catalytic pyrolysis, enzymolysis, catalytic depolymerization, and oxidation, have grown rapidly, wherein catalytic chemical conversion with the assistance of various catalysts is a very competitive method due to its exceptional selectivity and conversion efficiency . Photocatalysis strategies that can achieve selective reactions under mild conditions are receiving increasing attention. − The CdS photocatalyst possesses a narrow band gap (2.4 eV) and a wide visible light absorption range, making it a promising semiconductor material for the photocatalytic conversion of lignin. − However, the catalytic performance of the CdS photocatalyst is constrained by its relatively small specific surface area and short carrier lifetime, which limit its overall effectiveness.…”

Section: Introductionmentioning

confidence: 99%

CdS–SH/TiO₂ Heterojunction Photocatalyst Significantly Improves Selectivity for C–O Bond Breaking in Lignin Models

Xu,

Gao,

et al. 2023

ACS Catal.

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The selective breaking of the Cβ–O bond has great potential for the conversion of lignin into high-value aromatic monomers. In the present work, we designed a CdS–SH/TiO2 heterojunction photocatalyst for the efficient selective breaking of the Cβ–O bond. The surface modification of CdS by –SH promoted close contact between the catalyst and lignin and further promoted the Fermi level matching with TiO2. A type-II heterojunction was constructed by CdS–SH and TiO2 nanosheets to enhance the light absorption range and further increase the separation of photogenerated electron–hole pairs, resulting in high catalytic activity. Finally, 85% phenol and 87% acetophenone yields were obtained under mild light irradiation using 2-phenoxy-1-phenylethanol as the model substrate. Several control experiments, along with DFT calculations, indicate that the reaction pathway is more likely to involve the oxidation of Cα–OH to form CαO initially, followed by the activation of Cβ–O, which is then reduced to further form aromatic monomers. This work achieves the efficient selectivity of lignin depolymerization and provides a reference for the design of heterojunction photocatalysts in the valorization of lignin.

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Enhanced photocatalytic degradation of lignin by In2S3 with hydrophobic surface and metal defects

Cited by 23 publications

References 63 publications

Functionalized Regulation of Metal Defects in ln₂S₃ of p–n Homojunctions

Functionalized Regulation of Metal Defects in ln₂S₃ of p–n Homojunctions

Review on Catalytic Cracking of Lignin for the Production of Fuels and High-Value-Added Chemicals: Advances, Challenges, Opportunities, and Outlook

CdS–SH/TiO₂ Heterojunction Photocatalyst Significantly Improves Selectivity for C–O Bond Breaking in Lignin Models

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Enhanced photocatalytic degradation of lignin by In2S3 with hydrophobic surface and metal defects

Cited by 23 publications

References 63 publications

Functionalized Regulation of Metal Defects in ln2S3 of p–n Homojunctions

Functionalized Regulation of Metal Defects in ln2S3 of p–n Homojunctions

Review on Catalytic Cracking of Lignin for the Production of Fuels and High-Value-Added Chemicals: Advances, Challenges, Opportunities, and Outlook

CdS–SH/TiO2 Heterojunction Photocatalyst Significantly Improves Selectivity for C–O Bond Breaking in Lignin Models

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Product

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Functionalized Regulation of Metal Defects in ln₂S₃ of p–n Homojunctions

Functionalized Regulation of Metal Defects in ln₂S₃ of p–n Homojunctions

CdS–SH/TiO₂ Heterojunction Photocatalyst Significantly Improves Selectivity for C–O Bond Breaking in Lignin Models