JOURNAL OF HAZARDOUS MATERIALS
·
2012
·
IF 4.173
Chao Zhou,Naiyun Gao,Yang Deng,Wenhai Chu,Wenlei Rong,Shengdong Zhou
Disinfection by-products (DBPs) are a great challenge to our drinking water security. Particularly, nitrosamines (NAms), as emerging DBPs, are potently carcinogenic, mutagenic, and teratogenic, and have increasingly attained public attention. This study was to evaluate the performance of the NAms degradation by the ultraviolet (UV) irradiation (253.7 nm) in the presence of hydrogen peroxide (H 2 O 2 ). In the UV/H 2 O 2 system, hydroxyl radicals (OH ), a type of nonselective and powerful oxidant, was produced to attack the molecules of NAms. Factors affecting the treatment efficiency, including the H 2 O 2 dosage, initial NAms concentration, UV irradiation intensity, initial solution pH, and inorganic anions present in water, were evaluated. All the NAms degradation exhibited a pseudo-first-order kinetics pattern. Within 60 min, 0.1 mg/L of any NAms could be almost decomposed except NDPhA that required 120 min for complete removal, at 25 μmol/L H 2 O 2 and at initial pH 7. Results demonstrate that the UV/H 2 O 2 treatment is a viable option to control NAms in water.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2011
·Vol. 124
·期 6
·4678-4685
·
IF 1.24
Ying Chen,Yongbing Chen,Jingya Nan,Chunpeng Wang,Fuxiang Chu
A convenient approach has been developed for the preparation of microsize hydrogels composed of crosslinked poly(acrylic acid) (PAA) and poly( N -isopropylacrylamide) (PNIPAm). First, semi-interpenetration polymer networks of hydropropylcellulose (HPC) and PNIPAm- co -PAA copolymer are formed through the copolymerization and crosslinking of monomer acrylic acid and N -isopropylacrylamide in HPC aqueous solution. After the selective removal of HPC from networks due to ionization of PAA units and disruption of hydrogen bonding with increasing pH, PNIPAm- co -PAA microgels are obtained, whose volume is confirmed to be responsive to both temperature and pH. Doxorubicin hydrochloride (Dox) can be encapsulated in PNIPAm- co -PAA microgels with high drug loading driven by the electrostatic interaction, and a sustained-release characteristic of Dox from the microgels is observed under physiological pH value and temperature. In vitro cell experiments, the drug-loaded microgels can be taken up by LoVo cells and release their payload in cell cytoplasm without loss of drug efficacy. This indicates that PNIPAm- co -PAA microgels might be a potential drug delivery carriers especially for water-soluble or polypeptide drugs. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
✓ 已验证
产品关联
DOI
高影响因子
SYNLETT
·
2011
·Vol. 2012
·期 01
·145-149
·
IF 2.447
Wenpeng Mai,Jinwei Yuan,Zhicheng Li,Gangchun Sun,Lingbo Qu
All articles of this category A novel direct arylation of pyridine N -oxideswith arylboronic acids through C-H functionalization hasbeen developed. This new reaction is performed at room temperatureusing catalytic silver(I) nitrate in the presence of potassium persulfateand give 2-pyridyl arylation derivatives of pyridine N -oxides.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Kai Liu,Zizai Ma,Zihao Wan,Xiaoguang Wang
In this article, the hydrogen evolution performance in 0.5 M H 2 SO 4 and 1.0 M KOH is improved by introducing N atoms into Ni 2 P/Co 2 P through high-temperature doping (N–Ni 2 P/Co 2 P). N–Ni 2 P/Co 2 P has a lower overpotential than Ni 2 P/Co 2 P, which can achieve cathodic current densities of 10 mA cm −2 , 100 mA cm −2 at overpotentials of 48 mV, 228 mV in 1.0 M KOH and 63 mV, 211 mV in 0.5 M H 2 SO 4 . Density functional theory (DFT) results found that the introduction of N atoms changed the electronic structure of the catalyst. Due to the forward shift of d-band center, the binding force between the catalyst and H∗ is enhanced, providing favorable conditions for hydrogen evolution. Furthermore, the results of scaled-up tests show that 5 cm × 5 cm N–Ni 2 P/Co 2 P electrodes still exhibit superior performance, revealing a prospect of industrialization.
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2024
·Vol. 12
·期 7
·2400062
·
IF 3.6
Demin Jiang,Huina Chen,Liangjuan Zhu,Wei Wang,Yuqiao Wang
Biofouling of air cathode surface decreases the electricity generation performance of membrane-free microbial fuel cells (MFCs). Ag@Co/Zn N-doped carbon (Ag@Co/Zn-NC) is designed as an antibacterial oxygen reduction reaction (ORR) catalyst to inhibit biofouling on the cathode surface. The Co/Zn-NC active component promotes ORR catalytic activity through the advantages of well-distributed Co nanoparticles and numerous active sites. Superficial Ag nanoparticles act as antibacterial active species to inhibit bacterial proliferation and suppress biofilm growth. Ag@Co/Zn-NC catalyst prevents bacterial adhesion and biofilm formation, effectively preventing excessive biofouling on the cathode surface. The antibacterial catalyst maintains a high catalytic activity and good ion diffusion properties without the adverse effects of biofouling, resulting in enhanced ORR durability of the air cathode. The assembled MFCs achieve high electricity generation during long-term cyclic operation. The maximum power density retention percentage (82.6%) is higher than that of Co/Zn-NC MFC (65.3%) and Pt/C MFC (52.4%) after continuous operation for 1200 h. Excellent operational durability is revealed for the air-cathode MFCs assembled with the antibacterial ORR catalyst during the cyclic process. The novelty of this study is that the design of antibacterial catalysts inhibits the excessive growth of the cathode biofilm to improve the cyclic electricity generation performance of MFCs.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Meijing Cao,Jing Tian,Yang Zhou,WenLong Liu,Jin Dang,Weibing Li,Jiarun Li,Lei Wang
The low electrical conductivity and catalytic activity of transition metal sulfides have been identified as the primary factors limiting their application in the field of electrocatalytic water splitting. In this study, FeS 2 and Co-FeS x were initially synthesized through a hydrothermal method, followed by further annealing in an NH 3 atmosphere to obtain Co,N-FeS x . The introduction of Co led to adjustments in the electronic structure, resulting in the formation of FeS 2 /FeS (FeS x ) heterojunctions that facilitated accelerated charge transfer. Simultaneously, Co element doping increased the electrochemical active surface area, providing more active sites for the reactions. N element doping, on the other hand, introduced sulfur vacancies, thereby enhancing electrical conductivity and improving charge transfer efficiency. As a result, Co,N-FeS x exhibited significantly higher activities for the oxygen evolution reaction (OER) and overall water splitting compared to FeS 2 , with overpotentials of 290 mV and 330 mV, respectively, at a current density of 10 mA cm −2 . Furthermore, the catalyst demonstrated excellent stability. The designed structure of the catalyst provides theoretical support for the study of Fe-based catalysts in OER and overall water splitting.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Haiqian Zhao,Jiuyang Jia,Jiaxin Ying,Mingqi He,Zekun Sun,Xing Zhang,Zhonghua Wang,Wei Zhou
Utilizing flue gas as feedstock for CO 2 electro−reduction systems is a promising technology to address problems caused by excessive CO 2 emissions. However, the O 2 contained in the flue gas has a significant adverse effect on the CO 2 reduction. Herein, a facile strategy was proposed to suppress the influence of O 2 by constructing a CO 2 −enriched region. N−doping was demonstrated to be an efficient way to enhance CO 2 adsorption selectivity over O 2 on activated carbon. The N−doped activated carbon achieved 3.7 times increase in CO 2 adsorption selectivity over O 2 than that before modification under simulated flue gas atmosphere (75 %N 2 + 15 %CO 2 + 10 %O 2 ). The distinction in adsorption mechanism between CO 2 and O 2 was revealed by quantum chemistry study. The increased polarity of the carbon materials favored CO 2 adsorption and had less impact on O 2 adsorption. The electrostatic interaction between CO 2 and carbon material was demonstrated to be enhanced after the introduction of pyridinic N and pyrrolic N, which led to an improvement in the CO 2 adsorption capacity. The dispersion interaction, which fully regulated O 2 adsorption, was weakened due to the deviation of the O 2 adsorption position. This study provided a reference for the subsequent development of CO 2 selective adsorption materials.
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2024
·
IF 3.6
Longmei Yao,Xue Mei,Jiajia Zhi,Wenchang Wang,Qingyi Li,Ding Jiang,Xiaohui Chen,Zhidong Chen
In this study, a novel electrochemiluminescent (ECL) sensor for highly sensitive detection of trilobatin (Tri) was developed based on silver metal–organic frameworks (AgMOFs) and nitrogen-doped carbon quantum dots (N-CDs). N-CDs exhibited high ECL intensity but poor ECL stability, while AgMOFs had a large specific surface area, high porosity, and good adsorption properties. Compositing both of them not only improved the ECL stability of N-CDs, but also enhanced the ECL strength of materials, so AgMOF@N-CD composites were used as the luminophore of the sensor. Under the optimized conditions, the ECL sensor showed a linear range of 1.0 × 10−7 M to 1.0 × 10−3 M for the detection of Tri, and the detection limit was as low as 5.99 × 10−8 M (S/N = 3). In addition, the sensor had excellent reproducibility, stability, and anti-interference ability. It could be utilized for the detection of Tri in real samples with recoveries of 95.78–102.26%, indicating that the constructed ECL sensor for detecting Tri possessed better application prospects.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2025
·
IF 5.3
Jing Guo,Rui Liu,Chunhui Shen,Shanjun Gao
The N-spirocyclic ammonium with exceptional alkaline stability is employed to fabricate anion exchange membranes (AEMs) suitable for long-lasting fuel cell applications. In this paper, two types of N-spirocyclic ammonium, namely 3-(2-(piperidine-4-yl)ethyl)-6-azaspiro[5.5]undecan-6-ium (ASU) and 3,6-diazaspiro[5.5]undecan-6-ium (DSU), are incorporated into an acrylonitrile-styrene copolymer (SAN) to enhance the alkaline stability of AEMs. The introduction of N-spirocyclic ammonium results in AEMs exhibiting excellent alkaline tolerance, particularly the SAN resin membranes incorporating the ASU group (SAN-ASU-OH), which retain 95.0% of their initial conductivity after undergoing a 720-h alkaline treatment at 80 °C, and 1H NMR shows that almost no β-elimination occurred in the SAN-ASU-OH membranes. The utilization of SAN resin as the primary structural component provides a reasonable tensile strength (8.51 MPa) for SAN-ASU-OH, enhances the ion conductivity of AEMs significantly, and ensures a certain water uptake (WU) at the same time to ensure a low swelling ratio (SR). For instance, hydroxide conductivity of the membranes reached 67.7 mS cm–1 at 80 °C for the SAN-ASU-OH membrane while WU reached 81.65% and SR was limited to only 18.42% at 80 °C. The results indicate that the membranes based on SAN resins incorporating N-spirocyclic ammonium are expected to be promising candidates for future fuel cell applications.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Shaodong Xu,Yuan Yu,Dongfeng Sun,Yanning Qu,Linyin Huang,Yuhao Fan,Nandong Li,Pengpeng Qiang,Qingmei Su,Xiaodong Hao,Gaohui Du,Kai wang,Bingshe Xu
High reflection loss and wide absorption bandwidth materials are in great demand to prevent electromagnetic pollution and military applications. The composites prepared by combining different components with good dielectric and magnetic losses are expected to achieve ideal absorbing performance. In this study, a composite of cobalt nanoparticles enveloped in nitrogen-doped bamboo-like carbon nanotubes (Co@N-CNTs) was prepared by one-step annealing the mixture of melamine and cobalt nitrate at 800 °C in a mixed atmosphere of hydrogen and argon. Co nanoparticles derived from the reaction between H 2 and cobalt nitrate during the sintering process were used as catalysts to prompt the carbonization of melamine and the formation of the bamboo-shaped N-doped carbon nanotubes, thus forming the composite structure of bamboo-shaped N-doped carbon nanotubes encapsulated with Co nanoparticles. This Co@N-CNTs composite not only had an excellent dielectric loss and magnetic loss but also greatly improved its impedance matching, thus having good electromagnetic wave absorption performance. The coating made from the Co@N-CNTs composite had a maximum reflection loss (RL) of −35.89 dB at only 1.8 mm thickness at 14.1 GHz and possessed an effective absorption bandwidth of up to 4.91 GHz (12.35–17.26 GHz), suggesting it a high-performance and wide-absorption bandwidth composite material.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yun Liu,Guijiang Liu,Yanyan Yu,Yunying Wang
The burgeoning interest in single atom catalysts (SACs) stems from their exceptional oxidase-mimicking capabilities, driving substantial advancements in this field. Nevertheless, a critical knowledge gap remains regarding the influence of Zn incorporation on the oxidase-like activity of atomically dispersed Fe-N-C catalysts. This study successfully synthesized and comprehensively characterized three distinct SACs (FeZn SAC-N@C, Fe SAC-N@C, and Zn SAC-N@C) using TEM, HAADF-STEM, XRD, XPS, BET, ICP-MS, and XAFS techniques. Activity assays revealed that FeZn SAC-N@C exhibited the highest oxidase-mimicking activity, with Fe SAC-N@C displaying moderate activity, whereas Zn SAC-N@C did not exhibit oxidase-like behavior. The superior oxidase-like activity of FeZn SAC-N@C is attributed to its enhanced O 2 activation capacity, characterized by a high free energy of 0.90 eV in the rate-determining reaction step, surpassing those of Fe SAC-N@C (0.85 eV) and Zn SAC-N@C (0.71 eV). EPR and DFT calculations elucidated the catalytic mechanism of FeZn SAC-N@C, involving the generation of O 2 − radicals. As a proof-of-concept, FeZn SAC-N@C demonstrates potential as a colorimetric sensor for detecting ascorbic acid and nitrite, achieving a limit of detection of 0.77 μM for ascorbic acid and 0.16 μM for nitrite. These findings open a new avenue for configuring bimetallic atomically dispersed catalysts with oxidase-like activity in future research.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Zhiran Sun,Shuhua Liu,Yajie Guo,Fuxian Zheng,Bing Nan,Wenjun Kang,Konggang Qu,Lei Wang,Rui Li,Zongge Li,Lile Dong,Haibo Li
The sluggish reaction kinetics of oxygen reduction reactions (ORR), combined with a long-standing dependence on expensive and unstable platinum-based catalysts, has significantly hindered the progress of sustainable energy solutions. Here, we have developed an atomically dispersed bimetallic FeCu-loaded N-doped porous carbon (Fe 1 Cu 1 -NC) catalyst for remarkable ORR efficiency. X-ray absorption fine structure (XAFS) analysis accurately determines that the coordination state of atomically dispersed Fe-Cu sites is a two-N-bridged with N 6 ligand. Fe 1 Cu 1 -NC has demonstrated superior ORR performance in alkaline environments when compared to commercial Pt/C catalysts. Notably, Fe 1 Cu 1 -NC exhibits a higher power density and specific capacity than Pt/C in zinc-air batteries. Density functional theory (DFT) calculations further confirm that the improved performance is due to the combined action of Cu and Fe single atoms, which results in a negative shift of the d -band center energy of Fe and facilitates activation of ORR intermediates.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）