COMBUSTION SCIENCE AND TECHNOLOGY
·
2022
·
IF 2.133
Shuang Xu,Aimin Pang,Jie Kong
The liquid burning rate suppressants (BRSs) at room temperature were first prepared by combining urea with adsorption group from AP-bonding agents. The novel urea BRSs were applied in triethylene glycol dinitrate (TEDGN) plasticized hydroxyl-terminated polyether (HTPE) propellants. The results show that only 0.5% of them can reduce the burning rate and pressure index of the propellants at the same time. Owing to the adsorption group from AP bonding agents, the novel urea BRSs can adsorb onto the surface of AP during mixing by themselves, which are more suitable for industrial application than nano-sized or encapsulated BRSs. In addition, the desirable mechanical performance can be obtained and the BRSs have little influence on the hazardous properties of propellants.
研究领域:
推进剂化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2021
·
IF 8.271
Jing-Wen Zhang,Lun Pan,Xiangwen Zhang,Chengxiang Shi,Ji-Jun Zou
Carbon nitride (C 3 N 4 ) is promising for photocatalytic hydrogen production , but photogenerated electrons and holes in C 3 N 4 usually tend to exist as excitons due to intrinsic Coulomb interactions making its photocatalytic activity unsatisfactory. Herein, a well-designed intramolecular C 3 N 4 -based donor-acceptor (D-A) photocatalytic system was constructed to promote exciton dissociation. Due to its good chemical compatibility with melamine and appropriate sublimation property, 2-amino-4,6-dichloropyrimidine unit was chosen as the monomer to react with melamine to construct intramolecular D-A system (CNCl x ). The hydrogen evolution rate of CNCl 0.15 is 15.3 times higher than that of bulk C 3 N 4 under visible light irradiation, with apparent quantum efficiency of 13.6% at 420 nm. The enhanced activity is attributed to introduced electron-withdrawing −Cl group as terminal group in the resulted CNCl x samples, which can build internal electric field to promote the exciton dissociation into free electron and hole. In addition, lower work function value of CNCl x samples indicates that internal electric field can help free electrons and holes transfer to the surface of CNCl x samples for photocatalytic reaction.
研究领域:
材料科学
·
光催化化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Qiang Zhao,Hanxi Jiang,Boyan Tang,Yonggang Wu,Xinwu Ba,Hailei Zhang
Preparation of a smart tool for simultaneous detection and removal of hypochlorite (ClO–) in water, a kind of serious persistent pollutant in industrial wastewater and even in tap water, is a puzzling issue in the chemosensing field. Here, halloysite nanotubes (HNTs), a natural product with excellent dispersibility in water, were employed as the scaffold to solve the urgent problem. The diaminomaleonitrile moiety, accompanying with the coumarin derivative as a chemosensor unit, was decorated on the surface of the HNTs. The diaminomaleonitrile group can be transferred into substituted imidazole formation and thereby triggers strong fluorescence emission upon ClO–, which triggers a dramatically “turn-on” fluorescence change and reduce ClO– into eco-friendly chloridion (Cl–). The detection and removal capacities show high selectivity over other commonly used ions. These results suggest that the smart nanocomposite can be used in the synchronous detection and removal of ClO– in water, which may pave a path in water quality monitoring and treatment.
研究领域:
化学传感
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yuwei Xue,Lihua Liu,Ting Zhang,Ziqi Zhu,Mingjun Xu,Qian Zhang,Junming Hong
There has been growing attention in the combination of metal oxide nanoparticles with metal-organic frameworks (MOFs) for the synergistically intensified catalytic activity . Herein, functional Fe-MOF@Mn 2 O 3 composites were synthesized to activate peroxymonosulfate (PMS) for 4-Cholophenol (4-CP) degradation via a hydrothermal and calcination method. Under the reaction parameters of 2 mM PMS, 0.2 g/L catalyst dosage, and pH 7.0, 91.4% of 4-CP (10 mg/L) could effectively be degraded within 60 min (2.2-fold increase in reaction rate constant compared with pure Mn 2 O 3 ). The excellent degradation performance of Fe-MOF@Mn 2 O 3 /PMS system was attributed to the surface hydroxyl and synergistic effect between iron and manganese. Quenching reaction and EPR analysis revealed both sulfate (•SO 4 - ) and hydroxyl radicals (•OH) were responsible for 4-CP degradation. The Fe-MOF@Mn 2 O 3 composite exhibited intensive catalytic capability as well as electron transfer efficiency according to the electrochemical measurements. Meanwhile, the possible degradation pathways were proposed by analyzing intermediates via LC-MS detection. The results indicates that the Fe-MOF@Mn 2 O 3 /PMS system is effective and adaptable for the treatment of 4-CP in different water conditions.
研究领域:
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wen-Long Yu,Shi-Lei Zhao,Guang-Wen Xu,Xin Li,Xiao-Lei Zhang,Yu-Ling Shan,Jun-Wei Ding,Guo-Hui Qin,Jun-Mei Zhang,Xiang Feng,De Chen
The chloroxylenol (PCMX) has shown well virucidal efficacy against COVID-19, but the large-scale utilization of which will undoubtedly pose extra environmental threaten. In the present study, the recycled industrial phenylenediamine residue was used and an integrated strategy of “carbonization-casting-activation” using super low-dose of activator and templates was established to achieve in-situ N/O co-doping and facile synthesis of a kind of hierarchical hyperporous carbons (HHPC). The sample of HHPC-1.25–0.5 obtained with activator and template to residue of 1.25 and 0.5 respectively shows super-high specific surface area of 3602 m 2 /g and volume of 2.81 cm 3 /g and demonstrates remarkable adsorption capacity of 1475 mg/g for PCMX in batch and of 1148 mg/g in dynamic column adsorption test. In addition, the HHPC-1.25–0.5 exhibits excellent reusability and tolerance for PCMX adsorption under various ionic backgrounds and real water matrix conditions. The combined physio-chemistry characterization, kinetic study and DFT calculation reveal that the enhanced high performances originate from the hierarchical pore structure and strong electrostatic interaction between PCMX and surface rich pyridinic-N and carbonyl groups.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2017
·
IF 3.743
Xian Lu,Yisheng Shao,Naiyun Gao,Juxiang Chen,Yansen Zhang,Huiming Xiang,Youluo Guo
Diclofenac (DCF) is the frequently detected non-steroidal pharmaceuticals in the aquatic environment. In this study, the degradation of DCF was evaluated by UV-254 nm activated persulfate (UV/PS). The degradation of DCF followed the pseudo first-order kinetics pattern. The degradation rate constant (k obs ) was accelerated by UV/PS compared to UV alone and PS alone. Increasing the initial PS dosage or solution pH significantly enhanced the degradation efficiency. Presence of various natural water constituents had different effects on DCF degradation, with an enhancement or inhibition in the presence of inorganic anions (HCO 3 − or Cl − ) and a significant inhibition in the presence of NOM. In addition, preliminary degradation mechanisms and major products were elucidated using LC-MS/MS. Hydroxylation, decarbonylation, ring-opening and cyclation reaction involving the attack of SO 4 • − or other substances, were the main degradation mechanism. TOC analyzer and Microtox bioassay were employed to evaluate the mineralization and cytotoxicity of solutions treated by UV/PS at different times, respectively. Limited elimination of TOC (32%) was observed during the mineralization of DCF. More toxic degradation products and their related intermediate species were formed, and the UV/PS process was suitable for removing the toxicity. Of note, longer degradation time may be considered for the final toxicity removal.
研究领域:
环境科学
·
化学工程
·
毒理学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 39
·
IF 1.768
Shu-Ting Liu,Ping-Ping Zhang,Kang-Kang Yan,Yuan-Hu Zhang,Ying Ye,Xue-Gang Chen
In this study, a novel -intercalated layered double hydroxide (Sb-LDH) was prepared by simultaneous recovering of LDH structures and intercalation of into LDH layers. The prepared Sb-LDH composites remain the hydrotalcite structure with layered geometry and show higher thermal property than that of LDH. When applied to poly(vinyl chloride) (PVC) composites, Sb-LDH showed limited thermal stability for PVC at the early stage of thermal and thermooxidative degradation processes. However, Sb-LDH could retard the thermal cracking of the carbonaceous conjugated polyene of PVC which may hinder further degradation, and the moderate amount of Sb-LDH (1, 2, and 5 wt %) in PVC resin can retard the process of decarbonation and enhance char formation. Sb-LDH also promoted the transparency of PVC but darkened the color. With the advantages of transparency promotion, high temperature resistance, and long-term stability, the prepared Sb-LDH is a potential thermal stabilizer for PVC resins. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42524.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2017
·
IF 4.364
Yong Yang,Juncheng Huang,Ruoyu Zhang,Jin Zhu
A series of bio-based plasticizers based on isosorbide, a renewable monomer derived from glucose, were successfully synthesized. The chemical structures of the synthesized isosorbide diesters with different alkyl chain length were confirmed by FTIR and 1 H NMR. The influence of varying alkyl chain length on thermal and mechanical properties of isosorbide diesters in poly(vinyl chloride) (PVC) was investigated in detail. It was found that the plasticizing efficiency of isosorbide diester decreased as the alkyl chain length increased, reflecting on the gradually increased T g and the decreased elongation at break of PVC blend. However, the longer alkyl chain length of isosorbide diester improved the thermal stability of PVC blend and simultaneously depressed its volatility from PVC. Besides, the bio-based isosorbide diesters rivaled those petro-based phthalates, and they could be potential candidates to replace phthalates in the future industry.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Bo Yang,Yifan Zhang,Lijuan Wang,Huaigang Cheng,Li Cui
With the rapidly increasing demand for lithium resources, lithium extraction from low-grade and secondary resources has received widespread attention. The combination of tributyl phosphate (TBP) and FeCl 3 is the most studied and reported separation system. However, the selective extraction mechanism for lithium is not clear. In this study, the extraction systems consisting of different Lewis base ligands (L) with phosphoryl/carbonyl groups and FeCl 3 were employed for lithium extraction from the LiCl-MgCl 2 -H 2 O system. The extraction efficiency and selectivity of lithium by various Lewis base ligands with different branched structures were investigated. The interactions between Li + and the ligands were deeply analyzed by spectroscopic characterization and quantum chemistry calculations. Meanwhile, the relationship between the ligand structures and the selective binding ability of Li + was innovatively established. The results show that the extraction efficiency and selectivity of lithium by various ligands descend in the order: TIBP > TBP > N503 > MIBK > P350 > TBPO > TOA. The extracted complexes [LiL n ] + ·[FeCl 4 ] − are formed through the non-covalent interaction between Li + and the O atoms of the ligands as well as the Cl atoms of [FeCl 4 ] − . The ligand with low basicity, strong Mulliken electronegativity, and high average localized ionization energy minimum value is preferable for the selective extraction of Li + . On the contrary, the ligand is more likely to be protonated. The study provides a theoretical basis for deeply understanding the relationship between the ligand structures and their selective binding ability towards Li + , which is also conducive to developing more efficient systems for lithium recovery from complex solutions.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-8
·
IF 14.7
Geng Shitao,Zhao Xiaoju,Xu Qiuchen,Yuan Bin,Wang Yan,Liao Meng,Ye Lei,Wang Shuo,Ouyang Zhaofeng,Wu Liang,Wang Yongyang,Ma Chenyan,Zhao Xiaojuan,Sun Hao
Rechargeable calcium (Ca) metal batteries are promising candidates for sustainable energy storage due to the abundance of Ca in Earth’s crust and the advantageous theoretical capacity and voltage of these batteries. However, the development of practical Ca metal batteries has been severely hampered by the current cathode chemistries, which limit the available energy and power densities, as well as their insufficient capacity retention and low-temperature capability. Here, we describe the rechargeable Ca/Cl 2 battery based on a reversible cathode redox reaction between CaCl 2 and Cl 2 , which is enabled by the use of lithium difluoro(oxalate)borate as a key electrolyte mediator to facilitate the dissociation and distribution of Cl-based species and Ca 2+ . Our rechargeable Ca/Cl 2 battery can deliver discharge voltages of 3 V and exhibits remarkable specific capacity (1000 mAh g −1 ) and rate capability (500 mA g −1 ). In addition, the excellent capacity retention (96.5% after 30 days) and low-temperature capability (down to 0 °C) allow us to overcome the long-standing bottleneck of rechargeable Ca metal batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2014
·
IF 4.908
Li-Fen Liu,Zhi-Bin Cai,Jiang-Nan Shen,Li-Xiang Wu,Eric M.V. Hoek,Cong-Jie Gao
A novel poly(amide-urethane@imide) reverse osmosis (RO) composite membrane with chlorine-tolerant property was prepared on a polysulfone supporting film through two-step interfacial polymerization. The crosslinking agent – 5-choroformyloxyisophaloyl chloride (CFIC) was first reacted with 4-methyl-phenylenediamine (MMPD) via interfacial polymerization to get the nascent poly(amide-urethane) base membrane (CFIC–MMPD) without curing treatment. Then the resultant base membrane contacted again with the second aqueous solution containing functional secondary amine – N,N′-dimethyl- m -phenylenediamine (DMMPD) to obtain the poly(amide-urethane@imide) TFC RO membrane (MMPD–CFIC@CFIC–DMMPD). X-ray photoelectronic spectroscopy (XPS) was combined with attenuated total reflectance infrared (ATR-IR) to verify that the ultrathin polyimide film (CFIC–DMMPD) has been successfully grafted on the surface of the MMPD–CFIC base membrane. The images of scanning electronic microscopy (SEM) and atomic force microscope (AFM) showed that the poly(amide-urethane@imide) membrane has much smoother, more hydrophilic surface than the poly(amide/imide-urethane) membrane (MMPD/DMMPD–CFIC) prepared by conventional one-step interfacial polymerization of CFIC and composite MMPD/DMMPD. However, the permeation experiment revealed that the poly(amide-urethane@imide) membrane has a slight loss in both salt rejection and water flux than the poly(amide/imide-urethane) membrane and conventional commercialized polyamide membrane (MPD–TMC), but exhibits better chlorine-tolerant property due to the introduction of ultrathin polyimide film (CFIC–DMMPD) on the outmost surface of the TFC RO membrane, and the combination of IR and XPS analyses shows a good agreement with the chlorine exposure results of membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Water Resources and Industry
·
2023
·
IF 5.1
Jiayu Zhang,Qiongfang Wang,Lei Dong,Pinhua Rao,Xin Zhang,Naiyun Gao,Xiaoying Yin
In this paper, UV/NH 2 Cl process was used to research the degradation of sulfathiazole (STZ) and the formation of disinfection by-products (DBPs) after disinfection were detected. UV and NH 2 Cl process showed a synergistic effect on the removal of STZ. Natural organic matter and CO 3 2− inhibited the STZ degradation, NO 3 − promoted the degradation of STZ, whereas NH 2 Cl concentration, HCO 3 − and Cl − had dual effects on the removal of STZ. The removal of STZ by UV/NH 2 Cl was slightly influenced by pH. The contribution of reactive chlorine species and reactive nitrogen species to STZ degradation was significantly higher than that of HO · . Possible STZ degradation pathways were presented by analyzing intermediate products. In addition, the pretreatment of UV/NH 2 Cl significantly reduced the formation of DBPs during NH 2 Cl or NaClO disinfection. In conclusion, UV/NH 2 Cl process is an effective water treatment technology and can be well applied for practical purposes.
研究领域:
环境科学
·
水处理技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）