PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
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IF 6.9
Niao Zou,Hong Guo,Zhihong Zheng,Yuancai Lv,Yifan Liu,Zengpeng Chen,Minghua Liu
Heterogeneous electro-Fenton (hetero-EF) system was one of the most promising approaches for treating antibiotic-laden wastewater. However, the rational design of cost-effective, eco-friendly, and efficient earth-abundant electrocatalysts remains a significant challenge. This study synthesized a novel catalyst, lignin-based metal biochar (Co-L@C), from coniferous lignin via hydrothermal reaction and temperature-controlled pyrolysis. The results demonstrated that Co-L@C achieved nearly 100 % oxytetracycline hydrochloride (OTC) removal within 30 min employing the hetero-EF system, consistently exhibiting efficient OTC degradation rates across a wide pH range (3−9) and in various practical water matrices. In conjunction with the burst test and electron paramagnetic resonance (EPR) analysis, singlet oxygen ( 1 O 2 ) was shown to play a dominant role in OTC degradation. At the same time, further investigation revealed that hydroxyl radicals (·OH), superoxide radicals (O 2 ·− ), and dissolved oxygen (DO) all contributed to 1 O 2 production. This work offers a potential technology for the effective degradation of antibiotic-contaminated wastewater.
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高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Huiyu Tian,Haifeng En,Bingwen Li,Jinxian Zhao
An efficient Cu@C/SiO 2 catalyst for the hydrogenation of dimethyl oxalate (DMO) to methyl glycolate (MG) was prepared by sorbitol-modified ammonia evaporation method followed by calcination in N 2 . The Cu@C/SiO 2 catalyst exhibited the superior catalytic activity and stability for DMO hydrogenation compared with the Cu/SiO 2 catalyst. The optimized Cu@C/SiO 2 –1/4 catalyst exhibited an MG yield of 63 % during 90 h long-term evaluation under temperature of 210 °C, pressure of 1.9 MPa, WHSV of 1.25 g DMO ·g Cu -1 ·h -1 and H 2 /DMO of 150. The characterization results indicated that Cu dispersion can be significantly enhanced by the addition of an appropriate amount of sorbitol and the surface Cu 0 and Cu + species were effectively regulated by the amount of sorbitol. The catalytic activity of Cu@C/SiO 2 was linearly dependent on specific area of Cu + species under the sufficient specific area of Cu° for H 2 dissociation. In addition, the sorbitol–derived carbon species on the catalyst were also favorable for the enhanced stability owing to the suppression of Cu sintering.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Xing Li,Lei Xing,Chunyu Zhang,Shudan He,Fanghua Liu,Zhen Chen,Huazhen Chang,Junhua Li
Catalytic solvent regeneration is widely considered a promising solution for addressing the intensive heat duty of amine-based carbon dioxide (CO 2 ) capture. This highly challenging application has motivated researchers to develop excellent catalysts with high activity and durability. In this study, we engineered active and durable Fe − N − C catalyst coated with high-graphitization carbon layers (labeled Phen − Fe − N − C) through a secondary thermal pyrolysis treatment. The multiple graphite layers and atomic metal sties were verified by experimental characterization and coordination structure analysis. The improved graphite layers further enhanced the activity of Fe − N − C sites, providing more acid sites for proton-electron transfer and C − N breaking during solvent regeneration (or CO 2 desorption). Thus, the maximal CO 2 desorption rate increased by 50 % when Fe − N − C was used compared with that of the blank case, and the rate further increased by 27 % when Phen − Fe − N − C was used. After 15 days of hydrothermal testing, the single Fe atom over the spent catalysts presented no significant aggregation or dissolution in the solvent, validating the durability of Phen − Fe − N − C. This work demonstrates a feasible and novel strategy to improve M − N − C materials for efficient and robust CO 2 desorption from amine solvents toward energy-saving CO 2 capture.
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ACS Catalysis
·
2024
·
IF 11.3
Zhengyu Zhao,Zongxuan Yang,Hongmei Bai,Hongwei Zhang,Bowen Zhang,Xinru Wu,Zimeng Li,Cejun Hu,Xiaojun Bao,Pei Yuan
Aqueous-phase hydrogenation holds significance in achieving the large-scale green production of succinic acid, but the acidic reaction environment poses a considerable challenge in the design of highly active and stable catalysts. Herein, we report a spatial-confinement strategy to fabricate a CoNPs@Co-N-C core–shell structured catalyst where Co nanoparticles (CoNPs) are encapsulated tightly by nitrogen-doped graphitic carbon shells (NG), while Co single atoms (CoSA) are distributed homogeneously on the shells, which exhibits remarkable efficiency and stability in the aqueous-phase hydrogenation of maleic acid for the production of succinic acid in an acidic medium. The catalyst achieves 100% conversion of maleic acid, more than 98% selectivity toward succinic acid, and high stability for seven cycles without significant deactivation. The combined characterizations and density functional theory (DFT) calculations further indicate that CoNP and CoSA can concurrently optimize the electronic structure of the NG and promote hydrogen dissociation on the surface of the carbon shells. These findings shed light on the unique function of CoNP-NG-CoSA composite sites on regulating the hydrogenation active centers and provide a guideline for the further development of highly efficient acid-resistant hydrogenation catalysts.
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CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Siyuan Sun,Fan Yang,Xiaoyun Zhang,Jinxiu Qian,Kexin Wei,Junpu An,Yang Sun,Shuyang Wang,Xi Li,Yongfeng Li
Transition metal single-atom catalysts (SACs) have been widely used in oxygen reduction reactions (ORR) and oxygen evolution reaction (OER) due to its greatest atomic utilization and low costs, which catalytic performance can be further enhanced by electron distribution adjustment. Herein, we synthesized a carbon-encapsulated FeS/Fe 3 C nanoparticles doped carbon-based Fe single atom catalyst from fluid catalytic cracking (FCC) slurry though a one-pot pyrolysis. The synergistic effect between FeS/Fe 3 C nanoparticles and Fe single atom structure (FeN x ) promotes the ORR/OER processes, which may due to the reduction of the adsorption free energy of intermediates. Meanwhile, the polyaromatic hydrocarbon in FCC slurry enhances the graphitization of catalyst to facilitate charge transfer in electrocatalysis process, and the carbon-encapsulated nanoparticles sites possess higher stability and dispersion. As a result, the optimized catalyst (FeS/Fe 3 C@Fe-N-C) presents a high nanoparticles dispersion and graphitization level, which has a higher ORR catalytic ability (E 1/2 = 0.91 V vs RHE) compared with commercial Pt/C (20 wt%, E 1/2 = 0.879 V vs RHE) and a similar OER catalytic ability (E 10 = 0.1.506 V vs RHE) compared with RuO 2 (E 10 = 1.518 V vs RHE). A liquid Zn-air battery assembled with FeS/Fe 3 C@Fe-N-C show a peak power density of 113 mW cm −2 and an open potential of 1.432 V. This work sheds light on a new method to design transition metal active sites carbon based single-atom catalyst for enhanced ORR and OER processes.
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JOURNAL OF ELECTRONIC MATERIALS
·
2025
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IF 2.5
Tan Shangrong,Yao Zhuo,Huang Hong,Liu Zechen,Guo Shiqi,Zhao Xinyun
Electrochemical supercapacitors, given their high power density and excellent cycling stability, have broad applications from electronic devices to electric vehicles. In this study, we have developed novel nanocomposites to serve as electrodes of high-performance supercapacitors. The nanocomposites, referred to as Cu/MnX x (X = O, S, C)-rGO (rGO: reduced graphene oxide), were fabricated through direct oxidation, sulfidation, and carbonization at elevated temperatures from their metal–organic framework origin, i.e., Cu/Mn-BTC-rGO (BTC: benzene–1,3,5-tricarboxylic acid). This process is cost-effective and scalable, and can be fine-tuned to achieve a variety of nanocomposites with the desired chemistry and structural characteristics. The carbonized product, Cu/MnC x -rGO, is made up of nanoparticles of MnO and copper in close contact supported on rGO nanosheets via strong coupling. This material demonstrates excellent charge storage, rate capability, and cycling stability, i.e., high specific capacitance of 718.6 F g −1 at a current density of 1 A g −1 , with 92.6% capacitance retention after 1000 cycles. The hierarchical 3D structured Cu/MnC x -rGO nanocomposite has unique chemistry, high surface area, and high electrical conductivity, and hence ensures rapid ion and electron transport beneficial to both pseudocapacitive and double-layer capacitive performance.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
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IF 3.8
Yujie Zhang,Ning Cai,Yuehan Wang,Hang Wang,Juanqin Xue
Capacitive deionization (CDI) technology holds immense promise for the effective removal of copper ions from solution medium. However, the widespread application of CDI is hindered by limitations arising from the electrode formation process, which impacts the electrode’s mass transfer and adsorption performance. In pursuit of refining the electrode formation process, this study employs a one-step simultaneous electrospinning and electropolymerization method to fabricate PPy/C-HCPs composite electrodes. The results indicate that the fabricated PPy/C-HCPs composite electrode possesses a high specific surface area of 458.98 m2/g, which is 1.83 times that of the electrode prepared using the traditional electrodeposition method (251.26 m2/g). Furthermore, the maximum adsorption capacity for Cu2+ reaches 82.83 mg/g, marking a 2.19-fold enhancement compared to electrodes prepared through the same electrodeposition process (37.81 mg/g). Moreover, even after 1000 repetitive scans, the electrode exhibits exceptional cyclic stability, with only a marginal 1.42% decrease in specific capacitance. This study introduces a streamlined process for the preparation of high-performance electrode materials, providing a foundation for the shaping applications of polypyrrole composite electrode. Additionally, it presents a distinctive approach for the preparation of electrodes for CDI and supercapacitors, offering a unique perspective in the field.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
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IF 4.3
Yuwei Guan,Yanhong Lu,Yun Wei
Cytochrome c (Cyt- c ) was commonly an intrinsic biomarker for a variety of cellular characteristics, such as respiration, energy levels, and apoptosis. Herein, a simple fluorescence sensor was constructed for the detection of Cyt- c in buffer and real serum samples. The carbon dots doped with Tb 3+ on the premise of 1-(2-pyridylazo)-2-naphthol (PAN) were fabricated and used as a dual-emission ratiometric fluorescent probe for detecting Cyt- c based on the internal filtering effect (IFE). As a fluorescent probe for ultra-sensitive detection, Cyt- c was quantitatively detected at different concentrations from 1 to 1000 nM. The fluorescent detection method for Cyt- c showed a good linear relationship from 1 to 50 nM, and the limit of detection (LOD) was 0.35 nM. In the recovery range of 101.27–103.39 % in human serum samples, the relative standard deviation (RSD) was less than 3.27 % (n = 3). In the end, the possible structures of CDs were predicted by DFT theoretical simulation calculations. All the results proved the ability of carbon dots as fluorescent probes to detect biomarkers and the application prospects in bioanalysis.
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PubMed
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2024
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IF 1.9
Chengbo Liu,Jian Li,Chenyi Wang,Qiang Ren
Green technology for the fabrication of bio-degradable microspheres is exciting and needed. In this study, a new water-in-water Pickering emulsion green technology is proposed for the fabrication of the crosslinked starch microspheres with sodium tripolyphosphate as the crosslinker, polyethylene glycol aqueous solution as the continuous phase (PEG phase) and starch aqueous solution as the dispersed phase (starch phase). The factors that affect the morphology and particle sizes of cross-linked starch microspheres are investigated by laser scanning confocal microscope (LCM) and laser particle size analyzer. The results reveal that the particle sizes of crosslinked starch microspheres are increasing with increased starch concentration. The particle sizes of crosslinked starch microspheres show a first increase and then decrease trend with the increase of the concentration of PEG 20,000 in the PEG phase. The hydrophobic nano silica is used as an emulsifier to form water-in-water Pickering emulsion and shows an obvious effect on the morphology of starch microspheres. When the starch concentration is 20.00 wt%, PEG 20000 concentration is 32.56 wt%, the ratio of starch to PEG phase is 0.20 and the amount of silica is 5.00 wt% of starch, starch microspheres with regular shapes are obtained with the size of about 32.30 ± 0.22 µm. The fabricated cross-linked starch microspheres are non-crystalline and show good water and oil absorption performances. The application of fabricated crosslinked starch microspheres in the adsorption and release of Vitamin C is conducted. The maximum adsorption capacity of crosslinked starch microspheres for Vitamin C reaches 309.9 mg/g. Starch microspheres show a controlled release of Vitamin C in water. This study indicated that crosslinked starch microspheres can be fabricated through a green water-in-water Pickering emulsion technology and may find potential applications in degradable controlled-release microspheres.
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Journal of Water Process Engineering
·
2024
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IF 6.3
Fuliu Yang,Yong Chen,Xiaochun Wu,Yufeng Da,Peipei Xiong,Chenxi Wu,Yue Du,Yuhang Shi,Junfeng Zhao,Yong Liu
Coagulation–Fenton oxidation stands as a prevalent method for organic pollutant removal from MBR effluent in landfill leachate. However, its dependence on intricate coagulant preparation and hazardous H 2 O 2 handling presents challenges in logistics. Herein, a novel Al 0 /C–N, Cl composite was developed via high-energy ball milling and high-temperature sintering, which facilitates in situ generation of H 2 O 2 and aluminum salt coagulant upon stirring in oxygen-containing aqueous solutions. Under conditions of 2 g/L Al 0 /C–N, Cl and initial pH 9, H 2 O 2 production achieved 459 mg/L within 1 h, yielding an Al 3+ /H 2 O 2 bifunctional reagent. Subsequent coagulation in MBR effluent and Fenton oxidation achieved removal efficiencies of 85.5 %, 76.4 %, and 99.3 % for UV 254 , total organic carbon, and chromaticity, respectively. The efficient degradation of refractory fulvic-like substances was obtained from this novel “coagulation–Fenton” hybrid process without additional coagulants and H 2 O 2 . These results illustrated that the hybrid process is a promising and efficient technology for the advanced treatment of landfill leachate.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 38
·16776-16794
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IF 2.7
Jianwei Zhang,Chengming Bian,Ling Chen,Weidong He
Recently, we investigated the interaction mechanism of 1H-tetrazole (1H-TZ) and nitrocellulose (NC). Next, we tried to introduce an amino group at the C and N atoms of 1H-tetrazole, so as to explore the influence of amino group modification on the pyrolysis process of NC. The focus of this study was on investigating the interaction mechanism of aminotetrazole (5-ATZ or DATZ) and NC through kinetics methods and TG-DSC-FTIR analysis. The quenching and reheating experiments revealed that the imino form of 5-ATZ or DATZ played an important role in this process. The addition of aminotetrazole (5-ATZ and DATZ) mainly affected the autocatalytic reaction at the initial stage of the pyrolysis process of NC. TG-DSC-FTIR experiments revealed that there was a chemical reaction between NO2 and decomposition products of 5-ATZ or DATZ. In this reaction, R–NCNH or NC–NH–R (R = H and NH2) reacted with NO2 to form N2O and CO2.
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Journal of Building Engineering
·
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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