SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yaoping Guo,Qixing Peng,Yaxiong Huang,Shuai Yan,Yan Luo,Keng Xuan,Huimin Hu,Hao Jiang,Guanghui Wang,Sufen Zhao,Yadan Guo
In-situ S-doped mesoporous carbons (ACS) were fabricated through template method by using sucrose as carbon source and basic magnesium sulfate whisker (513 MOS) as both sulfur source and template. ACS were highly efficient for the activation of peroxydisulfate (PDS) towards aqueous oxytetracycline (OTC) removal. Investigation on the effects of 513 MOS/ sucrose mass ratio on the physicochemical properties and catalytic performance indicated that higher specific surface area, pore volume, thiophene-S (C-S-C) group content as well as carbon skeleton defects contributed to the excellent activity of ACS. 100 % of OTC removal was achieved by ACS-2 within 30 min under the optimal reaction condition, which outperformed most reported transition-metal based and carbon-based heterogeneous catalysts. ACS-2 also showed excellent adaptability with wide pH range as well as various pollutants. Mechanism studies showed that PDS were activated through radical and non-radical pathways, and four plausible degradation pathways of OTC were proposed according to the intermediates identification. This work provides a straightforward method for the construction of metal-free sulfur-doped activated carbons with highly activity for the removal of refractory organic pollutants.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Zhangwei Sun,Yuhao Qi,Kaile Wang,Jiaming Li,Xiaoyu Qiu,Yunhe Zhao,Li Guo
In this study, we developed an in-situ deposition method to load small-sized AgI nanoparticles as an oxidative photocatalyst (OP) onto phosphorus (P) and potassium (K) co-doped two-dimensional porous g-C 3 N 4 (PK-CN-N) as a reductive photocatalyst (RP), forming an S-scheme heterojunction photocatalyst AgI/PK-CN-N. PK-CN-N achieved morphology control and element doping, leading to surface functionalization and heterostructure formation for the AgI/PK-CN-N photocatalyst. Notably, the 50AgI/PK-CN-N composite demonstrated an approximately 95 % removal efficiency for RhB within 30 minutes, 17.6 times higher than pure g-C 3 N 4 , surpassing most reported g-C 3 N 4 -based photocatalysts. The enhanced photocatalytic efficiency is attributed to the surface modification strategy and heterostructure formation of g-C 3 N 4 , which broadens the visible light response range, increases the number of active sites, improves the separation of photogenerated electron-hole pairs, and enhances REDOX capabilities. The band structure of the composite was elucidated through Mott-Schottky analysis and UV–vis DRS. The formation of the AgI/PK-CN-N S-scheme heterojunction and its charge transfer mechanism was confirmed through XPS, band structure analysis, KPFM, and EPR spectroscopy. Experimental data confirmed the presence of a strong and effective interface electric field between the two semiconductors, leading to band bending and accelerated charge separation. Additionally, the introduction of small-sized AgI semiconductors enhanced the exposure of the coupling interface, further improving catalytic performance. The reusability and lifespan of the catalyst were also analyzed, showing that after four cycles, the photocatalytic activity remained above 92 %.
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Journal of Energy Chemistry
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2024
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IF 14
Shicheng Deng,Songfan Wang,Yuanyuan Wang,Qian Xiao,Yuena Meng,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Zhi Zheng,Sixin Wu
Kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells suffer from severe carrier recombination, limiting the photovoltaic performance. Unfavorable energy band alignment at the p-n junction and defective front interface are two main causes. Herein, oxygen incorporation in CZTSSe via absorber air-annealing was developed as a strategy to optimize its surface photoelectric property and reduce the defects. With optimized oxygen incorporation conditions, the carrier separation and collection behavior at the front interface of the device is improved. In particular, it is found that oxygen incorporated absorber exhibits increased band bending, larger depletion region width, and suppressed absorber defects. These indicate the dynamic factors for carrier separation become stronger. Meanwhile, the increased potential difference between grain boundaries and intra grains combined with the decreased concentration of interface deep level defect in the absorber provide a better path for carrier transport. As a consequence, the champion efficiency of CZTSSe solar cells has been improved from 9.74% to 12.04% with significantly improved open-circuit voltage after optimized air-annealing condition. This work provides a new insight for interface engineering to improve the photoelectric conversion efficiency of CZTSSe devices.
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Journal of Building Engineering
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2025
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IF 7.4
Hong Zhou,Shuzhen Zheng,Huina Li,Qianping Ran,Jianfeng Ma
Calcium silicate hydrates (C–S–H) is the primary product of cement hydration, and its structure and properties substantially influence the mechanical performance of cement-based materials. However, in practical applications, pure C–S–H has some shortcomings, such as susceptibility to microcracking and high porosity, which can reduce the durability and overall mechanical performance. To solve these problems, two different sizes of cellulose (microcrystalline cellulose nanoparticles and carboxylated cellulose nanofibers) were used to modify C–S–H nanocomposites, which were synthesized by hydrothermal synthesis. The characterization of the composites was analyzed in detail using methods such as TEM, FT-IR, and TGA. The results of these methods showed that cellulose was uniformly dispersed in the C–S–H matrix on the nanoscale, which formed an interwoven mesh structure. The mechanical properties of the cement paste were tested, including flexural strength and compressive strength. In addition, the cement paste containing the nanocomposites was analyzed by SEM, XRD and hydration heat tests. The results of these tests showed that the seed effect of C–S–H and the effective bridging effect of needle-like cellulose crystals on crack extension significantly improved their mechanical properties.
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AQUA-Water Infrastructure Ecosystems and Society
·
2024
·Vol. 73
·期 5
·930-944
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IF 2.1
Ye Miaomiao,Song Lei,Chen Peng,Li Kexin,Zheng Kai,Zhang Tuqiao,Liu Xiaowei
View large Download slide View large Download slide Close modal The S(IV)–Fe(II)/PM pretreatment has demonstrated preliminary potential as an effective ultrafiltration (UF) pretreatment technology. However, a comprehensive understanding of its impact on UF membrane fouling control and the dynamic evolution of membrane fouling during prolonged operation is still lacking. In this study, a relatively prolonged fouling experiment was conducted. Results revealed that the S(IV)–Fe(II)/PM pretreatment exhibited superior performance over Al(III) coagulation pretreatment in mitigating the transmembrane pressure difference and addressing both reversible and irreversible membrane fouling. The application of a cluster analysis method to classify membrane fouling evolution stages further confirmed that S(IV)–Fe(II)/PM pretreatment effectively decelerated the rate of membrane fouling evolution. The surface cake layer of UF membranes pretreated with S(IV)–Fe(II)/PM exhibited greater looseness and smoothness. It also showed better results than Al(III) coagulation pretreatment in reducing the accumulation of organic foulants, controlling the Si content and reducing the total microorganisms and live microorganisms in the UF feed water. Variance Partitioning Analysis indicated that the combined contribution of organic, inorganic, and biological foulants was the most significant for UF membranes after S(IV)–Fe(II)/PM pretreatment (50.4%) and UF membranes after Al(III) coagulation pretreatment (70.2%). These findings underscore the efficacy of S(IV)–Fe(II)/PM pretreatment in controlling UF membrane fouling under prolonged operation. S(IV)/Fe(II)/PM pretreatment efficiently mitigated UF membrane fouling during long-term operation. S(IV)/Fe(II)/PM pretreatment yielded a long uncontaminated stage and accelerated contaminated stage. S(IV)/Fe(II)/PM pretreatment suppressed the contribution of organic–inorganic–biological composite fouling.
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JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Yu Chen,Xirong Huang
CHAPS (3-[(3-cholamidopropyl) dimethylammonio]-1-propane sulfonate), a biocompatible zwitterionic surfactant derived from bile salt, has attracted great attention due to its distinct molecular structure and aggregation behavior. Addition of a low level of CHAPS to AOT (sodium bis(2-ethylhexyl) sulfosuccinate) reverse micelles has been found to be able to enhance the catalytic activity of the solubilized lipase. In this study, the effect of CHAPS on the lipase-catalyzed selective synthesis of (S)-n-octyl ibuprofen ester was investigated in AOT reverse micelles at 37 °C. The results demonstrate that the presence of CHAPS in AOT reverse micelle enhances both the yield and the enantiomeric excess (ee) value of (S)-n-octyl ibuprofen ester, especially at low water content. With 8 mM CHAPS in AOT reverse micelle ([AOT] = 100 mM, [H 2 O]/[AOT] = 12, pH = 7.0), a 48-hour yield of 34.2 % could be obtained, which is approximately twice that without CHAPS. In addition, the ee value of the product is increased from 89.1 % to 98.2 %. To understand the mechanism of the CHAPS effect, dynamic light scattering, fluorescence emission spectroscopy and Fourier transform infrared spectroscopy techniques were used to characterize the size of the reverse micelle, the conformation of the solubilized lipase and the activity of the bulk water in the reverse micelle. It reveals that at low water content, the addition of CHAPS enlarges the size of AOT reverse micelle, stabilizes the lipase conformation and reduces the nucleophilicity of bulk water in AOT reverse micelle. The synergistic effect of the aforementioned factors results in the improvement of the enzymatic synthesis of the ester. The above research provides scientific support for the lipase-based preparation of chiral acids/alcohols in the reverse micellar system.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2024
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IF 0
Li Longyun,Xiao Kunkun,Zhang Jinpu,Du Ruihan,Kang Chunli
This study successfully synthesized a composite photocatalyst g-C 3 N 4 /PbTiO 3 through hydrothermal and calcination methods using PbTiO 3 and g-C 3 N 4 . The catalyst was characterized by XRD, FTIR, Raman, XPS, SEM, TEM, UV–vis DRS, PL, and other techniques. The results indicate that the composite photocatalyst exhibits efficient electron transfer, enhanced light absorption, effective separation and utilization of photogenerated electron–hole pairs, demonstrating superior photocatalytic activity. Under simulated sunlight, the removal efficiency of methyl blue (MB) with an initial concentration of 10 mg/L reaches 93.0% after 120 min. After five cycles, the degradation efficiency of MB is 79.2%, still maintaining 85% of the initial catalytic activity. The pH values in the range of 4.0–7.0, inorganic anions, and water quality have a minimal impact on the photocatalytic degradation of MB. Additionally, the composite photocatalyst exhibits strong removal capabilities for other pollutants, such as tetracycline. Therefore, the prepared catalyst demonstrates good feasibility for practical applications. Free radical quenching experiments indicate that hydroxyl radicals (·OH) are the primary active groups in the photocatalytic degradation of MB. Based on this, a photocatalytic mechanism involving a S-scheme heterojunction has been proposed. This study provides new insights into preparing PbTiO 3 composite semiconductors and constructing novel S-scheme heterojunctions.
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APPLIED CATALYSIS A-GENERAL
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2024
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IF 4.7
Huiming Zhang,He Bian,Fang Wang,Yaping Li,Lijun Zhu,Daohong Xia
Photocatalytic CO 2 reduction is a practical solution to the energy dilemma and environmental damage caused by greenhouse gases, and it is very important to explore high-efficiency photocatalysts. In this study, a novel Bi 2 WO 6 /C 3 N 5 step(S)-scheme heterojunction was successfully constructed and applied for CO 2 photoreduction. The 2D/2D structure showed excellent photocatalytic properties, with methane production reaching 1.976 μmol·g −1 ·h −1 and selectivity reaching 100 % under 5 hours of visible light irradiation. The result indicates that combining Bi 2 WO 6 and C 3 N 5 can promote interfacial charge separation and maintain the optimal reducing ability of photogenerated electrons. Based on experimental and theoretical calculations, we characterized the reaction mechanism and heterojunction formation mechanism. This study offers a novel approach to improve the selectivity and photocatalytic efficiency of CO 2 reduction products.
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JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2010
·Vol. 48
·期 23
·5364-5374
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IF 3.971
You-Mei Bao,Xiao-Hui Liu,Xiu-Lan Tang,Yue-Sheng Li
A series of novel hyperbranched poly(ester-amide)s (HBPEAs) based on neutral α-amino acids have been synthesized via the “AD + CBB′” couple-monomer approach. The ABB′ intermediates were stoichiometrically formed through thio-Michael addition reaction because of reactivity differences between functional groups. Without any purification, in situ self-polycondensations of the intermediates at elevated temperature in the presence of a catalyst afforded HBPEAs with multihydroxyl end groups. The degrees of branching (DBs) of the HBPEAs were estimated to be 0.40–0.58 and 0.24–0.54 by quantitative 13 C NMR with two different calculation methods, respectively, depending on polymerization conditions and structure of monomers. The influences of catalyst, temperature, and intermediate structure on the polymerization process and molecular weights as well as properties of the resultant polymers were investigated. FTIR, NMR, and DEPT-135 NMR analyses revealed the branched structure of the resultant polymers. The HBPEAs possess moderately high molecular weights with broad distributions, glass transition temperatures in the range of −25.5 to 36.5 °C, and decomposition temperatures at 10% weight loss under nitrogen and air in the regions of 243.4–289.1 °C and 231.4–265.6 °C, respectively. Among them, those derived from D , L -phenylalanine display the lowest degree of branching, whereas the highest glass transition temperature and the best thermal stability. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010
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Journal of the Taiwan Institute of Chemical Engineers
·
2025
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IF 6.3
Fazal Muhammad Khoso,Jin-Gang Yu
Background Self-assembled GO-based 3D composites with porous or layered architectures have shown distinct qualities in terms of excellent selectivity and high stability. The functionalization of GO with N- and S-rich compounds can enhance its selectivity by increasing active sites for the adsorption of Cd 2+ . Method By decorating GO with 2-mercapto-1,3,4-thiadiazole (MTD), a novel, environment-friendly, and cost-effective 3D MTD@GO 2:1/100 ° C/2 h composite with abundant active sites was successfully fabricated using a convenient facile one-step hydrothermal method. The 3D MTD@GO 2:1/100 ° C/2 h composite demonstrated exceptional selectivity and efficiency in removing Cd 2+ from aqueous solutions. Significant findings The batch adsorption studies were conducted to enhance the adsorption efficiency of 3D MTD@GO 2:1/100 ° C/2 h composite toward Cd 2+ ions, and an excellent adsorption capacity of 37.176 mg∙g -1 was obtained under optimized conditions ( t = 40 min, pH= 7, T = 298 K). The adsorption kinetic, isothermal, and thermodynamic studies showed that adsorption data were better demonstrated with the pseudo-second-order model ( R 2 = 0.999), and the Langmuir isotherm model suggested that the heterogeneous, surface chemisorption at monolayer coverage was the rate-limiting step, and the adsorption was endothermic. Analytical techniques such as SEM for morphology, elemental mapping analyses, and EDS, The Brunauer-Emmett-Teller (BET) method was used to determine the specific surface area (SSA), while the Barrett-Joyner-Halenda (BJH) method was utilized to analyse the pore size distribution., Zeta potential for surface charge, TGA for thermal stability, FT-IR for functional groups, and XPS were used to understand the adsorption mechanism and characterize the prepared 3D MTD@GO 2:1/100 ° C/2 h composite. The 3D MTD@GO 2:1/100 ° C/2 h composite with good stability also had a strong possibility of Cd 2+ ion recovery ( R = 92.94 %) from aqueous solution, and a promising ability to be reused for up to seven cycles. With these prominent qualities of selective adsorption for Cd 2+ ions, the 3D MTD@GO 2:1/100 ° C/2 h composite can be a suitable and sustainable material for wastewater treatment in practice.
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JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
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2025
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IF 4.9
Xinxin Liu,Zhengfei Hong,Rongrong Li,Shuxian Hou,Xuechao Shi,Guoqiang Yang,Yuxuan Wang,Yimei Wang,Zhiru Tao,Jun Ge,Fei Ge,Yiyan Song,Jun Wang
Wound infections caused by surgery, chronic ulcers, or trauma have been a challenge for clinicians, especially multiple resistant bacteria induced by the misuse of antibiotics, which has increased the risk of bacterial infection. It is very urgent to design and develop antimicrobial materials with potential for clinical application against drug-resistant bacterial infections. In this study, a photothermal montmorillonite-chitosan hydrogel system (MNT-CS Gel) was fabricated as a photothermal antimicrobial dressing. This study found for the first time that montmorillonite (MNT) has good photothermal properties and photothermal conversion efficiency under near-infrared (NIR) light, and on this basis, its application research was carried out. The MNT possesses broad-spectrum antibacterial activity with significant inhibitory effects against E. coli and S. aureus, excellent photothermal stability under NIR light. And all the performances were improved after combining with CS-Gel, especially in bacterial adsorption capacity and photothermal performance. Notably, MNT-CS Gel was used as a photothermal antibacterial agent for the first time, and the antibacterial effects in vitro and their mechanisms have been systematically investigated. It was found that the MNT-CS Gel had significant inhibitory and destructive effects on bacteria in an in vitro pigskin model. The MNT-CS Gel could adsorb the bacteria strongly, inhibit bacterial biofilm formation, induced the generation of ROS, destroy the structure of bacteria, and cause the leakage of nucleic acids. The MNT-CS Gel demonstrated good photothermal antimicrobial properties, suggesting that the MNT-CS Gel has potential for clinical hygiene applications.
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LANGMUIR
·
2024
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IF 3.7
Cong Shen,Shaomu Wen,Jing Yan,Zhipeng Ai,Lin Mo,Yang Qing
The environmental friendliness, economic feasibility, and high efficiency of carbon quantum dots (CQDs) render them as highly promising candidates for corrosion inhibitors. The present study proposed the fabrication of nitrogen- and sulfur-codoped CQDs via an one-step hydrothermal method using l-cysteine and 4-aminosalicylic acid as precursors. The structure, particle size, and surface ligands of the prepared CQDs were determined through spectroscopy and transmission electron microscopy characterization. Subsequently, the inhibition performance of the CQDs on carbon steel in a 0.5 M sulfuric acid solution was evaluated through weight loss measurement, electrochemical methods, and surface analysis. The CQDs exhibited remarkable inhibition efficiencies of 97.9% at 293 K and 98.9% at 313 K, with a concentration of 150 ppm. In addition, the obtained CQDs demonstrated a combined physisorption and chemisorption adsorption behavior, which complied with the Langmuir adsorption isotherm. These findings provide insight into the inhibition mechanism and highlight the potential of codoped CQDs for corrosion mitigation applications in acidic environments.
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