POLYMER BULLETIN
·
2023
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IF 3.2
Wang Limei,Luo Jing,Zhu Huirong
Using cheap epichlorohydrin and dimethylamine as monomers in order to introduce cationic groups, acrylamide as another monomer, and ammonium persulfate as initiator through free radical copolymerization in aqueous solution, cationic sacrifice agent (SA1) was synthesized. Similarly, an amphoteric sacrifice agent (SA2) containing both quaternary amine and carboxylate functional group was synthesized. The terpolymers were used as a sacrifice material for polycarboxylate superplasticizer (PCE), and its reactive mechanism in cement–PCE–water with clay system was studied, which is desirable to solve the problem of PCE sensitivity to clay. The flow behavior of cement paste containing PCE in the presence and absence of clay was assessed. It was pointed out that the presence of montmorillonite (MMT) or kaolin significantly reduced the dispersion effect of PCE, eventually decreased the slurry fluidity. Fortunately, the addition of the sacrifice agents hindered this disadvantage. The fluidity of slurry increased with the increase in the amount compared with the lack of sacrificial agent. The sacrifice agent has a positive effect on retaining the fluidity of cement pastes, and to some extent makes up for the poor dispersion of PCE in the presence of clay impurities. The adsorption of SA1 or SA2 by MMT particles was studied by total organic carbon (TOC) analyzer. The results show that SA1 or SA2 can be preferentially adsorbed on particles by MMT compared with conventional PCE which result in more releasing PCE macromolecules and less useless loss. The sacrifice agent provides a possibility for improving the adaptability of PCE in low-quality cementing materials and has a potential application. Graphical Abstract
研究领域:
建筑材料化学
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高分子化学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Si-Yu Chen,Ji-Pan Yu,Zhi-Fang Chai,Wei-Qun Shi,Li-Yong Yuan
Although organic sacrificial agents are often used to improve the efficiency of photocatalytic reactions, the impact of their existence on the performance evaluation of photocatalysts has not been analyzed yet. In this study, to clearly understand the role of organic sacrificial agents in the photocatalytic process, the photocatalytic reduction of hexavalent uranium (U(VI)) by alcohols is systematically analyzed. The results reveal that under the conditions of pH 5, nitrogen atmosphere, visible light irradiation, and no photocatalyst, the alcohol sacrificial agents can directly reduce U(VI) with efficiencies as high as 98%. Uranium dioxide, formaldehyde, and hydrogen ion are identified as the final products of the photocatalytic reaction, and the reaction mechanism is proposed based on the results of electron paramagnetic resonance (EPR) spectroscopy. Accordingly, it is inferred that alcohol as an organic sacrificial agent markedly interferes with the performance evaluation of photocatalysts during the photocatalytic reduction of U(VI). Overall, this study provides valuable insights into the actual role of sacrificial agents in the photocatalytic reduction process.
研究领域:
环境科学
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化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2020
·Vol. 44
·期 6
·4616-4628
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IF 3.741
Yunlong Zhou,Xiaoyuan Ye,Dongyao Lin
Summary In this study, alkali pretreated corn stover was added as a sacrificial agent to the suspension of Pt/TiO 2 to significantly enhanced photocatalytic hydrogen evolution. The changes in structural characteristics of corn stover before and after alkali treatment and photocatalytic reactions were studied. According to the results, the removal of lignin and hemicellulose, as well as the changes in surface morphology, structural components, and functional groups of alkali pretreated corn stover may affect the photocatalytic hydrogen production process. Next, the effects of NaOH concentration, pretreatment time and temperature on hydrogen production were also investigated. Among them, within the scope of the experimental conditions, the optimal hydrogen production is 25.84 μmol h −1 . Moreover, the enhancement of photocatalytic hydrogen production is also achieved by using the waste liquid of alkali pretreated. The output of this study may provide a reference for the reuse of alkali-treated biomass residues and waste liquor in some industries, and make more comprehensive, efficient and green use of native lignocellulosic biomass.
研究领域:
环境科学
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能源科学
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材料科学
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DOI
高影响因子
Science China-Chemistry
·
2025
·
IF 9.7
Bai Rui,Li Junpeng,Chen Wei,He Yi,Zhou Xudong,Tian Xiaochun,Ren Chongyuan,Chen Liqi,Xiao Yong,Zhao Feng
The integration of microorganisms and photosensitizers presents a promising approach to chemical production utilizing solar energy. However, the current system construction process remains complex. Herein, we introduce a straightforward and efficient solar-to-chemical conversion system that combines the dissolved photosensitizer Eosin Y with the non-photosynthetic bacterium Moorella thermoacetica . Under light radiation, acetate production increased to 5.1 µM h −1 µM −1 catalyst, exceeding the previously reported maximum by 5.9-fold, with a quantum efficiency of 17.6%. The soluble photosensitizer EY can penetrate the cell and directly engage in intracellular energy metabolism, significantly enhancing intracellular ATP and NADPH/NADP + levels. Within this biohybrid system, sacrificial agent triethanolamine played a dual role: (1) providing continuous photoelectron generation by Eosin Y, enhancing intracellular reducing power, and facilitating carbon fixation via the Wood-Ljungdahl pathway; and (2) its oxidation product, formaldehyde, served as a critical intermediate and a direct precursor for methylenete-trahydrofolate in the Wood-Ljungdahl pathway, consequently simplifying reaction steps and markedly boosting acetate yield. This study provides a simple microorganism-photosensitizer biohybrid system to produce acetate and light on the multifaceted roles of sacrificial agents, paving the development of efficient solar energy conversion with nonphotosynthetic bacteria.
研究领域:
微生物学
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生物能源
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合成生物学
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DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 2
·157
·
IF 4
Shun Li,Xinbo Liu,Xinyue Zhang,Yong Liu
Piezocatalysis is a promising technology for converting mechanical energy to chemical energy. Two-dimensional (2D) piezoelectric materials, with their large surface area, high charge mobility, and good flexibility, are among the most promising candidates in piezocatalysis. In this work, for the first time, we report Bi2O2Se nanosheets (NSs) with an average thickness of ~8 nm and a lateral size of ~160 nm for efficient piezocatalytic H2O2production from water and oxygen under mechanical force induced by ultrasonication. The Bi2O2Se NSs achieved a high H2O2production rate of 1033.8 μmol/g/h using ethanol as the sacrificial agent, significantly surpassing that of its bulk-sheet counterpart. Our results provide a novel potential 2D piezocatalytic material and offer valuable guidance for the design and development of high-efficiency H2O2production driven by mechanical energy from water.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
高影响因子
STARCH-STARKE
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2021
·
IF 2.741
Bin Li,Ruijun Gao,Ling Wang
For improving the workability of clay-containing cement paste superplasticized by polycarboxylate ether (PCE), a new starch-based sacrificial agent is synthesized in the following two steps: first, the starch is sulfonated to obtain sulfonated starch (SS) with a strong steric effect, which is verified through its dispersion performance; then, SS is quaternized to obtain starch-based sacrificial agent (SSB). The structure of SSB is characterized by FT-IR and element analysis. Montmorillonite (MMT), as the most detrimental clay, strongly perturbs the dispersing power of conventional PCE. Therefore, the MMT-tolerance property of SSB is tested. With the addition of 0.02 wt.% SSB, the fluidity of MMT-containing cement paste is increased from 191.5 to 222 mm and the rheological property of MMT-containing cement paste is improved by reducing the yield stress and the flow index ( τ 0 and n in Herschel-Bulkley model). Adsorption experiments, DLS, and XRD are used for explaining SSB's clay-tolerance mechanism. Adsorption experiments show that the cationic group enhanced the interaction between MMT and SSB; DLS and XRD demonstrated that SSB is adsorbed on MMT through electrostatic attraction and could hinder the interaction between PCE and MMT by its high steric effect.
研究领域:
材料科学
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土木工程
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Wei Gao,Yuyan Wang,Ming Zhong,Huichun Kang,Bitao Su,Ziqiang Lei
Currently, the majority of photocatalytic materials primarily consist of insoluble semiconductors, whereas soluble semiconductor materials have limited applications in photocatalysis. In this study, it is proposed for the first time to use the soluble semiconductor sodium molybdate (Na 2 MoO 4 ) as a sacrificial agent to fabricate a polyacrylic acid/sodium molybdate-Fe 3+ hydrogel photocatalyst (PAA/Na 2 MoO 4 -Fe 3+ ) through polymerization with Fe 3+ ions and acrylic acid (AA) monomer. The hydrogel photocatalyst was thoroughly characterized and the results revealed that the presence of Na 2 MoO 4 in ionic form within the hydrogel significantly enhanced its adsorption capacity for pollutant molecules. Additionally, Fe 3+ ions coordinated with -COOH ( L ) groups on PAA to form [Fe( L ) 6 ] 3+ ions, which acted as active sites of photocatalytic. Moreover, the PAA/Na 2 MoO 4 -Fe 3+ hydrogel exhibited promising potential as a photocatalyst for the remove of dye pollutants (e.g. MB, MG, RhB and MO) from wastewater. Finally, we also explored and analyzed the photocatalytic mechanism of the hydrogel. It is noteworthy to conclude that the hydrogel possesses immense potential for the practical application of photocatalytic techniques in the treatment of dyes wastewater.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
ChemSusChem
·
2025
·
IF 6.6
Yuchao Chen,Fangfang Wu,Yulong Chen,Dongshu Liu,Junkang Zhang,Pu Wang,Yancong Feng,Wenxian Liu,Tianqi Deng,Wenhui Shi,Xiehong Cao
Aqueous zinc-ion batteries (AZIBs) offer significant promise for large-scale applications due to their low cost,high safety,and sustainability,prompting researchers to address the key issues of zinc dendrite formation,anode side reactions, and cathode dissolution.Despite most current research focusing on optimizing either the anode or the cathode, achieving coordinated improvements in both electrodes is crucial for fully realizing the potential of zinc-ion batteries (ZIBs), and remains a significant challenge due to the complexity involved in balancing the performance of both electrodes. Herein, we propose a sacrificial agent-promoted protective strategy that enhances the performance of both the anode and cathode simultaneously. Specifically, the mercapto-containing sacrificial agent adsorbs on the Zn anode, localizing electrons around the thiol group to trigger an in-situ transformation reaction. This reaction forms a modulation layer that optimizes Zn2+ deposition. Concurrently, the agent promotes the formation of a protective MnO2 nanoparticle shell to reduce cathode dissolution. This strategy significantly enhances the cycling stability of both the Zn||Zn and MnO2||Zn cells, achieving 4.5 and 3 times longer performance,respectively,compared to those in ZnSO4 electrolyte.This work presents a simple and efficient dual-function approach that simultaneously stabilizes the Zn anode and suppresses Mn-based cathode dissolution, offering a promising pathway for the practical development of AZIBs.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jiayu Gu,Chen Wei,Jinhao Xu,Xiu Zhang,Chunjie Zhu,Da Teng,Leyi Liu,Meizhi Lan,Wenjing An,Yingying Xu,Pengxiang Qiu,Shuxian Hu
This study demonstrates a strategic paradigm in photocatalytic nitrogen fixation by engineering semiconductor hole oxidation dynamics to circumvent ammonium degradation. Diverging from conventional approaches focused on light absorption and carrier mobility enhancement, we develop a sacrificial agent-free system leveraging attenuated hole oxidation capacity to fundamentally suppress oxidative depletion of NH 4 + . Bi 2 O 2 Se (BOS) serves as an archetypal catalyst, revealing mechanistic correlations between weak hole oxidizing environments and nitrogen reduction efficiency. Experimental analyses confirm BOS's superior performance over traditional photocatalysts, attributed to its intrinsic capacity to prevent NH 4 + oxidation while enabling effective product enrichment. Remarkably, the catalyst maintains equivalent nitrogen fixation efficiency in ambient air and inert atmospheres, demonstrating exceptional oxygen compatibility. Furthermore, BOS exhibits panchromatic photon utilization extending into near-infrared regions (AQE = 0.12 % at 700 nm). The unmodified bulk-phase characteristics of BOS highlight its inherent catalytic superiority, challenging conventional modification-dependent catalyst design frameworks. This work establishes oxidation potential modulation as a critical determinant in photocatalytic nitrogen fixation while providing a material platform and conceptual blueprint for sustainable ammonia synthesis technologies.
研究领域:
催化化学
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材料科学
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光化学
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能源化学
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环境科学
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半导体物理
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可持续技术
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xin Cao,Kaifu Yu,Yang Zhang,Nan Li,Peng Wang,Li Zhou,Xiang Gong,Hongbin Wang,Fan Yang,Wenkun Zhu,Rong He
Reduction of hexavalent uranium [U(VI)] by the photocatalytic method opens up a novel way to promote the selectivity, kinetics, and capacity during uranium removal, where organic molecules act as the sacrificial agents. However, the addition of sacrificial agents can cause a secondary environmental pollution and increase the cost. Here, a UiO-66-based photocatalyst (denoted as MnOx/NH2-UiO-66) simultaneously with efficient U(VI) confinement sites and water oxidation sites was successfully developed, achieving excellent U(VI) removal without sacrificial agents. In MnOx/NH2-UiO-66, the amino groups served as efficient U(VI) confinement sites and further decreased the U(VI) reduction potential. Besides, MnOx nanoparticles separated the photogenerated electron–hole pairs and provided water oxidation sites. The U(VI) confinement sites and water oxidation sites jointly promoted the U(VI) photoreduction performance of MnOx/NH2-UiO-66, resulting in the removal ratio of MnOx/NH2-UiO-66 for U(VI) achieving 97.8% in 2 h without hole sacrifice agents. This work not only provides an effective UiO-66-based photocatalyst but also offers a strategy for effective U(VI) photoreduction.
研究领域:
环境科学
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材料科学
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化学
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产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
·
IF 4.6
Ting Zhang,Ruipeng Hou,Rong Wu,Chen Zhang,Yindi Yu,Wenlong Yang,Shunhang Wei
Limited by rapid carrier recombination, the photocatalytic hydrogen peroxide (H 2 O 2 ) generation performance of Zn 2 In 2 S 5 is far from practical application. Herein, Zn 2 In 2 S 5 /In 2 S 3 S-scheme heterostructures were constructed by employing a one-step hydrothermal strategy that precisely adjusted the Zn:In precursor ratio. Thanks to the band structures with sufficiently redox ability of In 2 S 3 and Zn 2 In 2 S 5 , as well as enhanced carrier separation and transfer efficiency, the optimal Zn 2 In 2 S 5 /In 2 S 3 heterostructures (ZIS/In 2 S 3 -1:4) achieved a sacrificial-agent-free H 2 O 2 production rate of 339.5 μM h −1 under AM 1.5 irradiation, which approximately 1.7 times higher than that of pristine Zn 2 In 2 S 5 . Meanwhile, it also exhibited good H 2 O 2 evolution rate under visible-light irradiation and reusability. Its apparent quantum yield (AQY) at 380 nm, 420 nm, and 450 nm reached to 1.32 %, 1.11 %, and 0.63 %, respectively. In addition, the introduction of In 2 S 3 inhibited H 2 O 2 decomposition and enhanced the selectivity of H 2 O 2 production. In the photocatalytic process, superoxide radicals and holes were the key reactive substances, thereby H 2 O 2 was generated via a two-step single-electron O 2 reduction reaction process and one-step two-electron water oxidation reaction process. The construction strategy of the Zn 2 In 2 S 5 /In 2 S 3 S-scheme heterostructures is expected to provide a new perspective for the design of photocatalysts for efficient H 2 O 2 synthesis.
研究领域:
材料科学
·
光催化
·
能源化学
·
纳米材料
·
环境功能材料
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产品关联
DOI
高影响因子
SOLAR ENERGY
·
2025
·
IF 6.6
Jiayuan Geng,Yipei Cao,Hongquan Fu,Jinming Chang,Hejun Gao,Fang Liao,Juan Zhang,Yunwen Liao
Photocatalytic nitrogen fixation, converting atmospheric nitrogen into ammonia under ambient conditions, offers a sustainable alternative to the Haber-Bosch process. Herein, the hydrothermal and solvothermal methods to prepare the heterojunction based on BiOCOOH nanosheets and BiOBr nanosheets (BiOCOOH/BiOBr) have been reported. The BiOBr nanosheets epitaxially grow along the nanosheets structure of BiOCOOH. The BiOCOOH/BiOBr heterojunction exhibit photogenerated electron–hole separation properties, which was ascribed from the suitable bandgap values for photocatalytic nitrogen fixation. The NH 3 yield of BiOCOOH/BiOBr heterojunction (63.7 μmol·g −1 ·h −1 ) was about 9 times higher than that of pure BiOCOOH with addition of 0.75 mL of methanol as a sacrifice solvent. Moreover, it is confirmed that the texture coefficient of the (102) BiOBr facet between BiOCOOH and BiOBr is positively correlated with photocatalytic performance, which verifies the growth law of BiOBr on BiOCOOH and explains the formation of the heterojunction from a new perspective. The oxygen vacancies from the (102) BiOBr facet can facilitate the adsorption of nitrogen molecules with a stable adsorption energy of 0.1 eV by density functional theory calculations. This study may offer new perspectives for the design of a series of photocatalytic nitrogen fixation catalysts, particularly in terms of crystal facet control and oxygen vacancy-enhanced nitrogen adsorption.
研究领域:
材料科学
·
环境科学
·
化学工程
·
纳米技术
·
物理化学
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产品关联
DOI
高影响因子
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