CATALYSIS LETTERS
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2025
·Vol. 155
·期 10
·1-13
·
IF 2.4
Chen Shiqi,Huang Zhixuan,He Wentao,Wang Xinyu,Yang Zhiwei,Zhang Jing
Molybdenum nitride, because of the strong metal-support interaction between nitrogen and the metal, exhibits activity superior to that of bare metals, demonstrating its effectiveness as a co-catalyst to address the slow kinetics of the iron reduction in the Fenton process. Here, we introduced Mo 2 N as a co-catalyst to accelerate the cycles of Fe 3+ /Fe 2+ within a Fenton-like system consisting of Fe 3+ and H 2 O 2 , thereby enhancing the activation of hydrogen peroxide to generate reactive oxygen species (ROS). The system demonstrates excellent recyclability and stability. XPS spectroscopic analyses reveal that Mo(III) and Mo(IV) species on the Mo 2 N surface are capable of reducing free Fe(III), while FTIR analyses show nitrogen (N) and nitrogen oxide (NO x ) facilitate the adsorption and coordination of iron. Both homogeneous and heterogeneous reduced iron species are active in the activation of H 2 O 2 . EPR spectroscopy further confirms that the primary ROS generated are hydroxyl radicals (·OH) and superoxide anions (·O 2 − ). This study not only underscores the feasibility of Mo 2 N-based Fenton-like systems but also provides a new strategy for promoting the practical application of Fenton chemistry. Graphical
研究领域:
环境化学
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催化
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材料科学
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物理化学
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分析化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xu Zhang,Dongxiang Zhang,Dagang Li,Shusen Chen,Fengqi Zhang,Zilei Zhang,Haocun Tan,Le Yang,Jinzheng Hou,Runchao Tan,Jinying Li,Xiyan Xu
Carboxymethylcellulose-based zwitterionic cryogels (AO-PAM/CMC) with a supermacroporous pore structure were prepared through cryo-polymerization and post-modification strategies. The hydrogel exhibited a supermacroporous structure, excellent hydrophilicity, superior mechanical properties, and resistance to biological contamination. Through a comprehensive investigation of the U(VI) adsorption process, it was observed that the AO-PAM/CMC hydrogel was predominantly characterized by chemisorption, wherein uranyl ions were adsorbed on the surface in the form of a monolayer. Under the conditions of 45 °C and pH = 5.0, the hydrogel demonstrated remarkable adsorption performance, with the maximum adsorption capacity reaching 1223.6 mg∙g −1 , showcasing a high degree of selectivity for U(VI). In real seawater, the hydrogel's adsorption capacity for uranium reached 12.95 mg∙g −1 after 25 days of exposure, with the adsorption equilibrium being essentially reached in about 10 days. The adsorption mechanism of U(VI) by the hydrogel was confirmed through XPS spectroscopy and DFT calculations. The synergistic interplay between guanidino and zwitterionic moieties within the AO-PAM/CMC hydrogel enhanced U(VI) adsorption capacity and facilitated rapid uranium extraction from seawater. (UES). Therefore, the AO-PAM/CMC hydrogel presents a novel solution to address the inefficiencies of existing technologies for uranium extraction from seawater, contributing an innovative approach to the sustain-able development of nuclear energy.
研究领域:
环境科学
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材料科学
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核工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Debao Liu,Baolu Shi,Chenqi Wang,Zeshuai Li,Xianbo Wang,Baosheng Xu,Lijie Qu
Herein, the SiC ceramic aerogels with in-situ growth of SiC nanowires (SiC w /SiC CAs) have been synthesized by polymer‐derived ceramics (PDCs) method. The morphology, microstructure, and phase composition of the as-prepared samples were systematically investigated through SEM, XRD , TEM , Raman spectrum, FT-IR spectrum, and XPS spectrum techniques. The results showed that the as-obtained SiC w has a diameter of about 80 nm and a length of 1–3.5 μm. In addition, the formation mechanism and evolution process of growth SiC w were systematically studied using a VLS growth mechanisms. The way in this work could be expanded to synthesize other Si-based porous ceramic aerogel nanostructed with nanowires.
研究领域:
材料科学
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纳米技术
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陶瓷
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DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 22
·8352-8361
·
IF 0
Tao Wang,Luxiang Wang,Dongling Wu,Wei Xia,Hongyang Zhao,Dianzeng Jia
A one-pot hydrothermal route was developed for the preparation of nitrogen-doped graphene (NG) hydrogels using graphene oxide (GO) as a raw material and nine amino acids with different acidities (acidic, neutral and basic) as doping agents. The morphology, structure and composition of the prepared NG using three amino acids (DL-aspartic acid, acidic; L-glycine, neutral; L-arginine, basic) were characterized by SEM, nitrogen physisorption, Raman and XPS spectroscopy. Acidic amino acids yielded NG with a cross-linked 3D network with a large specific surface area of 367.1 m2 g−1, while NG arising from the use of basic amino acids showed a tightly stacked structure with a much smaller surface area of 10.5 m2 g−1. The charged amino acids, and the ensuing electrostatic interactions between the amino acid and GO, affect the morphology of NG, and ultimately affect its electrochemical performance. The samples prepared using acidic amino acids, with the lowest surface N content (1.0%) but the largest surface area, displayed high specific capacitance of 246 F g−1 at 3 A g−1. The microstructure, surface area and effective nitrogen content, mainly the pyridinic nitrogen group related to pseudocapacitance, play important roles in the capacitive performance of the NG samples.
研究领域:
材料科学
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纳米技术
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电化学
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产品关联
DOI
Journal of Cleaner Production
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2023
·
IF 11.1
Zhenxiong Ye,Huidi Zhang,Xujie Chen,Lifeng Chen,Kunyapat Thummavichai,Xinpeng Wang,Toyohisa Fujita,Yuezhou Wei
Palladium is versatile in many industrial applications due to its distinct physicochemical properties . Due to the scarcity of natural resources and the growing market demand, palladium recovery from wastes such as spent catalysts is receiving increasing attention. Here, a silica-supported thiourea resin (SiPS-TU) was prepared and applied to separate Pd(II) from spent catalysts. The SiPS-TU was fabricated through in situ polymerization and post modification method using amorphous macroporous silica as the matrix. Experimental results suggested that the optimal acidity for the adsorption process was 0.1 M under selected range, and the uptake of SiPS-TU was affected by H + and Cl − . The adsorbent showed rapid sorption kinetics with an equilibrium attained in 30 min, while more than 3 h was required for the commercial D840 resin. Column tests showed that SiPS-TU had excellent dynamic separation property for Pd(II) in continuous process. Around 215 bed volumes (430 mL) of Pd(II) solution could be effective treated by the SiPS-TU bed before breakthrough at 4 mL/min, while D840 resin bed was less effective under equivalent conditions (20 mL). In view of its satisfactory adsorption performances, palladium was successfully separated from the catalyst leaching solution by SiPS-TU. XPS spectra and DFT calculations indicated that the adsorption mechanism of SiPS-TU for Pd(II) mainly involved anion exchange and coordination. In conclusion, this study provides a feasible material for palladium recovery from practical leachate.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Huiping Zeng,Jianxue Li,Jiaxin Xu,Wei Qi,Ruixia Hao,Guowei Gao,Da Lin,Dong Li,Jie Zhang
The widespread use of tetracycline (TC) is a non-negligible cause of environmental pollution , such as antibiotic resistance genes (ARGs). Economical, green and efficient treatment methods are urgently needed. In this study, the magnetic N-doped iron sludge based biochar (N-BCFe) was prepared by a one-step pyrolysis method using the iron-containing sludge from groundwater treatment plants, sycamore leaves and urea as raw materials to active persulfate (PS) for TC degradation . The results show that under the optimal experimental conditions, the removal rate of 10 mg/L TC in the N-BCFe/PS system could reach 86.56% (120 min), accompanied by a 59.9% reduction in total organic carbon (TOC), and still 63.34% of TC was removed in the third recycle experiment. Combined with EPR, free radical quenching experiments and XPS spectra, it is confirmed that there are free radicals ( S O 4 · − , ·OH) and non-radical ( 1 O 2 ) pathways in N-BCFe/PS system. And the former is related to Fe doping, while the latter is attributed to N doping (nitrogen-containing functional groups). Seventeen TC intermediates were identified by LC-MS technology, and three TC degradation pathways were established accordingly. Generally, this study illustrates the considerable catalytic potential of N-BCFe and provides valuable insights into the synthesis of catalysts prepared from iron-containing sludge as feedstock.
研究领域:
环境科学
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化学
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材料科学
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水处理
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Meng Li,Chunxia Tang,Shaohai Fu,Kam Chiu Tam,Yongzhong Zong
The reduction and sequestration of toxic Cr(VI) via a one-step process in an aqueous solution is critical to eliminate its environmental risk. In this study, amine functionalized cellulose-based aerogel beads (CGP) was developed for simultaneous and efficient adsorption- reduction- sequestration of Cr(VI). CGP showed a maximum Cr(VI) adsorption capacity of 386.40 mg/g at 25 °C due to its strong electrostatic attraction towards Cr(VI). The simultaneous Cr(VI) adsorption- reduction- sequestration performance of CGP over a wide Cr(VI) concentration range was examined. The mechanism was investigated in-depth via the analysis of adsorption kinetics , XPS spectra, and FTIR spectra. Moreover, the Cr immobilization stability of CGP after adsorption was evaluated in simulated neutral, acidic, and alkaline conditions. The effect of pH, temperature, ionic strength and the presence of interfering ions on CGP adsorption performance were investigated by batch adsorption experiments. Fixed-bed column adsorption study was performed to explore the application potential of CGP beads in a wastewater treatment process.
研究领域:
环境科学
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化学工程
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yongzhi Liu,Huaili Zheng,Yanyan An,Jie Ren,Xinyu Zheng,Chun Zhao,Shixin Zhang
In this work, the novel β-cyclodextrin based polymeric flocculants (CADs) were synthesized and applied on the treatment of humic acid (HA)-kaolin wastewater. Acrylamide (AM) and acryloyloxyethyltrimethyl ammonium chloride (DAC) were grafted onto β-cyclodextrin (β-CD) by ultrasound assisted initiation using ceric ammonium nitrate as initiator. The synthesized conditions were optimized by evaluating the intrinsic viscosity and grafting efficiency of CADs. Furthermore, the characterization methods including Fourier transform infrared spectroscopy (FTIR), 1 H nuclear magnetic resonance spectroscopy ( 1 H NMR), thermogravimetric/differential scanning calorimetry (TG/DSC) and scanning electron microscopy (SEM) were used to evaluate and analyze the molecular structure and surface morphology of graft copolymers. In flocculation experiments, the effects of dosage, flocculant types, solution pH and flocs properties on flocculation performance were investigate in detail. CADs exhibited more satisfactory turbidity and HA removal performance than the synthetic cationic flocculants (PAD) and the non-ionic graft polymers (CAM). At the optimum dosage 4 mg/L, the maximum turbidity and HA removal rate of CAD 1# was 97.5% and 68.3%, respectively. Furthermore, CAD 1# exhibited a good flocculation performance and wide flocculation window in the pH range of 2.0–8.0. Lastly, the flocculation mechanism of CAD was detailed discussed by the investigation of zeta potential, surface tension, flocs FTIR and XPS spectra. Results indicated the unique hydrophobic internal structure of β-CD played an important role in improving the removal rate HA of CAD.
研究领域:
环境工程
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聚合物化学
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水处理
✓ 已验证
DOI
高影响因子
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