JOURNAL OF CHEMICAL THERMODYNAMICS
·
2015
·
IF 2.679
Qi Zhang,Yang Yang,Limin Cheng,Cuicui Cao,Zhiwen Ding,Chunxiao Wang,Wenge Yang,Yonghong Hu,Yonglan Li
The solubility of dl -malic acid in binary solvent mixtures consisting of (methanol + acetonitrile); (methanol + N,N-dimethylformamide); and (methanol + isopropyl alcohol) was measured at temperatures ranging from (278.15 to 328.15) K by gravimetric method. Values of the solubility were fitted using modified Apelblat equation and Buchowski–Ksiazaczak λ h model. Computational results showed that the modified Apelblat equation was superior to the other equation. In addition, the thermodynamic properties of the solution process, including the Gibbs free energy, enthalpy, and entropy were calculated by the van’t Hoff analysis. This study provides valuable data for the dl -malic acid purification by the preferential crystallization procedure.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Meiling Liu,Liping Wang,Qilong Fan,Ningning Xiao,Zhiwen Chen,Yingying Dong,Chuanliang Zhao,Yongxia Sun,Xing Xu,Wendong Wang
Nitrogen (N)-doping has been reported effective to reinforce catalysis in advanced oxidation processes (AOPs) due to the formation of N-related active sites. Although several documents have reported that transition metal-nitrogen (metal-N x ) sites could work as reactive centers, the catalytic mechanism was hardly elucidated. In this study, N-doped cobalt oxide (N-CoO x ) was initiatively prepared via calcination in ammonia atmosphere to construct cobalt-nitrogen (Co-N x ) sites. The emergence of Co-N x sites effectively improved peroxymonosulfate (PMS) activation efficiency (above 5.8 times), leading to higher pollutant decomposition rate (95.8 % at 30 min) and kinetics constant (above 4.1 times). N introduction changed main facets of material and elevated adsorption energy (E ads ) (from −1.81 eV to −3.71 eV) between catalyst and PMS. Co atoms at Co-N x sites could donate larger quantity of electrons (from 1.088 e to 1.583 e) to PMS, therefore, contributed to stretching and breaking O–O bonds of PMS molecules to form reactive species. As a result, both radical and electron transfer pathway (ETP) were enhanced in the oxidation processes. Ultimately, the catalytic membrane coated with N-CoO x maintained 100 % treatment towards continuous antibiotic wastewater at environmentally relevant concentration (μg/L), realizing purification as well as separation of catalyst. This work systematically elaborates the superiority of Co-N x sites and unravels the underlying mechanism to inspire further study to metal-N x tailored catalysis.
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ELECTROCHIMICA ACTA
·
2011
·
IF 3.65
Zhe Sun,Ren-Kai Zhang,Huan-Huan Xie,Mao Liang,Rui-Hong Du,Song Xue
4- N , N -Dimethylaminopyridine (DMAP) was introduced into poly(ethyleneoxide)/oligo(ethylene glycol) (PEO/PEG) electrolytes for dye-sensitized solar cells (DSCs). The improved photovoltaic performance of DMAP-doped DSCs was attributed to the integrated effects of the upward displacement of the TiO 2 band edge and the decrease in the electron recombination rate. Remarkably, the presence of DMAP suppresses electron recombination via two combined pathways involving the dissociation of triiodide to iodide by a complexation reaction and a modification of the surface state distribution in the band gap of TiO 2 . With the addition of DMAP, the open-circuit voltage enhances dramatically. The short-circuit photocurrent density has a small increase at low DMAP concentration and drops afterwards. The power conversion efficiency is 4.07%, which corresponds to a 63% increase over that of the DSC without DMAP.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Yali Wang,Shuangbo Zhang,Jiang Bian,Joseph Brake,Chaoyang Luo,Chuanwen Sun,Xiaobin Wu
Mercury has caused severe harm to the environment and human health. A novel biological screen method was developed and identified a Hg 2+ chelator BDTH2. Both biological and chemical methods demonstrated BDTH2 displayed a high specificity and strong binding capacity for Hg 2+ . Toxicological experiments of BDTH2 demonstrated its good safety. To enhance the sensitivity, functional composite BDTH2-AuNPs were synthesized, and the system exhibited strong specificity to Hg 2+ and excellent anti-interference capabilities. The optimized colorimetric method and the paper test strip method showed a visual detection limit of 3 nM less than 30 s and 5 nM within 1 min respectively. This system was evaluated for detecting spiked Hg 2+ concentrations in environmental water and six agricultural food samples and showed high consistence with those of ICP-MS. Therefore, this study provides a novel, rapid, and economical method for on-site detecting of Hg 2+ in water and agricultural products.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shuaishuai Li,Xudun Shen,Bowang Zhao,Longnian Tang,Yechen Qian,Wenyao Li,Shijie Li
Aqueous sodium-ion batteries (ASIBs) are promising for large-scale electrical energy storage (LSEES) applications due to their cost and safety advantages. However, the low voltage stabilization window of water (∼1.23 V) and the lack of cathode with high specific capacity and long cycle life have limited their development. Cobalt-based Prussian blue analogues (NaCoPBAs) have the advantage of high theoretical specific capacity but short cycle life. Recently, the molecular crowding electrolyte (MCE) strategy has been proposed to improve the electrolyte voltage stability window (ESW) of electrolytes, in this work, we report an improved xMC (x: ratio, MC: molecular crowding agent) electrolyte that uses N–N dimethylacetamide (DMAC) as the molecular crowding agent and NaOTf as the advanced salt with an ESW of 2.65 V and excellent nonflammability. The side reactions of the NaCoPBA//Hard Carbon (HC) full-cell active material are improved with the aid of the electrolyte. Capacity retention of 75 % after 600 cycles with excellent cycling stability. These results demonstrate that this advanced MCE strategy can be utilized for practical applications designed for safety, high specific capacity and long cycle (ASIB).
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Materials Advances
·
2025
·
IF 4.7
Xinxin Li,Lianjie Du,Zhou Wan,Doudou Xu,Chen Liu
In this study, novel ZnO/BiOI/AgI ternary heterojunction photocatalysts were synthesized via a facile precipitation method to address challenges in organic pollutant degradation and microbial disinfection under visible light irradiation. The composites were systematically characterized (XRD, SEM, TEM, XPS, BET, UV-vis DRS, and PL), showing significantly enhanced visible light absorption, efficient charge carrier separation, and superior photocatalytic performance, compared to binary and single-component counterparts. The optimized ZnO/BiOI/AgI-3030 sample achieved 98.1% degradation of Rhodamine B (RhB) and 59.1% degradation of Norfloxacin (NOR) within 3 hours, attributed to the synergistic effects of the heterojunction structure, which facilitated efficient charge transfer and promoted the generation of reactive oxygen species (ROS). Furthermore, the composite demonstrated remarkable antibacterial activity against Escherichia coli (E. coli), Staphylococcus aureus (S. aureus), and methicillin-resistant Staphylococcus aureus (MRSA), with bactericidal rates exceeding 99.8%. Cytotoxicity assays revealed 88.79% inhibition of DLD-1 colorectal cancer cells. Mechanistic studies confirmed the formation of a unique n–p–n heterostructure, enabling effective charge carrier separation and strong redox capabilities. Additionally, the photocatalysts exhibited excellent stability and reusability over four consecutive degradation cycles, maintaining high catalytic efficiency. These findings underscore the potential of ZnO/BiOI/AgI ternary composites as efficient and sustainable photocatalysts for environmental remediation and antimicrobial applications.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jing Ma,Yaoyao Linghu,Kai Yuan,Rui Zhou,Hui Gao,Peihua Zhao,Shaohui Guo,Huiqi Wang,Yongping Qu,Chao Shen,Keyu Xie
Aqueous Zn–I 2 battery (AZIBs) has attracted wide attention with its low cost, high capacity, low reduction potential and high safety. Iodine-based materials have the advantages of environmental protection, excellent cycle stability and low cost. However, there are some challenges, such as poor conductivity, slow kinetics and solubility of iodine species. Therefore, an innovative approach is proposed that exhibits excellent electrical conductivity and effectively anchors iodine species through physical trap with microporous structure and strong chemical adsorption with the synergistic effects of triazine and secondary amine-N. The dynamic transfer mechanism between them enhances catalytic conversion of iodine. The melamine-formaldehyde polymer and MXenes (Ti 3 C 2 T x ) composite (NC@TC) is prepared as host material of iodine by the electrostatic self-assembly. DFT calculation indicates thermodynamically favorable adsorption of iodine species, significantly accelerating the iodine redox reaction kinetics. Specifically, it reaches a discharge capacity of 183.07 mAh g −1 at 1.0C ever after 200 cycles (1.0C = 211 mAh g −1 ). Moreover, it also has excellent cycling performance, maintaining 81.33 % capacity after 5000 cycles. Additionally, NC@TC cathodes maintain good electrochemical performance under high current conditions and pouch cell structures. This work highlights the potential of MXene-based composites as promising iodine host materials for advanced Zn–I 2 batteries.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2017
·Vol. 2017
·期 44
·5196-5204
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IF 2.444
Fangfang Zhong,Jianzhang Zhao
Two different chromophores, pyrene (Py) and naphthalimide (NI), were introduced as acetylide ligands in a heteroleptic diimine N^N Pt II bis(acetylide) complex (Pt-NI-Py) to broaden the absorption bands and enable the intramolecular energy-transfer process. Steady-state and transient spectroscopy were used to study the photophysical properties of the complexes. The lowest triplet state of Pt-NI-Py ( τ T = 34 µs) is localized on the pyrene part, although the singlet-state energy level of the naphthalimide unit is lower. Intramolecular energy-transfer processes were observed. Moreover, Pt-NI-Py shows enhanced visible-light harvesting compared with the bis(pyrenylacetylide) complex (Pt-Py) and a lower triplet-state energy level than that of the bis(ethynylnaphthalimide) complex (Pt-NI). The results demonstrate that the relative energy levels of the singlet excited states of the different chromophores do not agree with the relative energy levels of the triplet states of the same chromophores. Efficient triplet-state generation ( Φ Δ = 0.8) gives Pt-NI-Py a high triplet–triplet annihilation (TTA) upconversion efficiency (34 %). Graphical A Pt II complex (Pt-NI-Py) with naphthalimide (NI) and pyrene (Py) chromophores as acetylide ligands exhibits a broad absorption band and pyrene-localized room-temperature phosphorescence ( Φ P = 4 %). Efficient singlet oxygen generation ( Φ Δ = 80 %) and a high quantum yield for triplet–triplet annihilation (TTA) upconversion ( Φ UC = 34 %) verify that Pt-NI-Py is a good triplet photosensitizer.
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CHINESE JOURNAL OF CHEMISTRY
·
2016
·Vol. 34
·期 9
·861-865
·
IF 1.872
Hina Saba,Jianggen An,Yong Yang,Min Xue,Yongsong Liu
The electrochemical properties of a series of 1,4-dimethoxypillar[ m ]arene[ n ]quinones (DMP[ m ]A[ n ]Qs) and the interactions between individual quinone units have been investigated on glassy carbon electrode in acetonitrile. All the quinone units showed relative electron uptake behavior except 1,4-dimethoxypillar[5]quinones (DMP[5]Q). The results have shown that the electrochemical behavior of the DMP[ m ]A[ n ]Qs is comparatively different from that of their related linear quinone analogues. The resultant properties were attributed to the close proximity of redox-active sites as well as the delocalization of electrons on the aromatic rings. Another aspect to be considered responsible for their electronic properties was suggested to be the electrostatic repulsions between adjacent quinone units in these complex structures. Current studies provide a better understanding on the voltammetric behavior of pillararene derivatives with different numbers of quinone units as well as their future scope in certain future electrochemical applications.
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MACROMOLECULAR RAPID COMMUNICATIONS
·
2013
·Vol. 34
·期 16
·1319-1324
·
IF 4.929
Chaohong Zhang,Ci Song,Wantai Yang,Jianping Deng
This communication reports the first gold nanoparticles (NPs) chirally functionalized with optically active helical substituted polyacetylene (the resulting hybrid particles are defined as Au@PPA NPs). The novel nanoparticles consist of gold as core and optically active helical poly( N -propargylamide) as shell and show considerable optical activity derived from helical poly( N -propargylamide) chains with predominantly one-handed screw sense. The Au@PPA NPs are prepared by a three-step approach: i) a thiol-containing N -propargylamide monomer [M th , HC≡CCH 2 NHCO(CH 2 ) 10 SH] is synthesized and characterized with FTIR and 1 HNMR spectroscopy and elemental analysis; ii) a copolymer (poly(M th - co -M ch )) was prepared by starting from monomer M th and another chiral N -propargylamide monomer (M ch ); poly(M th - co -M ch ) formed helical conformations and showed optical activities; and, iii) Au@PPA NPs are prepared from hydrogen tetrachloroaurate (III) and poly(M th - co -M ch ) through a one-spot procedure by using LiBH 4 as reducing agent. The as-obtained hybrid nanoparticles are characterized by FTIR spectroscopy, TEM, UV-vis absorption and circular dichroism (CD) techniques. UV-vis and CD measurements demonstrated the remarkable optical activity of the Au@PPA NPs. More interestingly, the Au@PPA NPs show much stronger UV-vis and CD sigals when compared to the corresponding orginal helical copolymer, poly(M th - co -M ch ). The chiral hybrid nanoparticles demonstrate different absorption toward (R)-(+)- and (S)-(−)-1-phenylethylamines, preferentially adsorbing the (S)-isomer.
研究领域:
纳米医学
·
生物材料
·
分子识别
·
药物递送
·
化学生物学
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PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
·
2021
·
IF 1.082
Jianqiang Wang,Fangmin Shi,Dongyan Dai,Liping Xiong,Yongpo Yang
An efficient reduction of sulfoxides to sulfides mediated by N-bromosuccinimide (NBS)/HCl system has been developed. This protocol shows good functional group compatibility as well as broad substrates scope with operational simplicity.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Abubakar Yakubu Haruna,Yubo Luo,Wang Li,Zheng Ma,Tian Xu,Qinghui Jiang,Junyou Yang
Bismuth telluride-based (Bi2Te3) alloys have long been considered the best thermoelectric (TE) materials at room temperature. However, the n-type Bi2Te3 alloys always exhibit poor thermoelectric performance than their p-type counterpart, which severely limits the energy conversion efficiency of thermoelectric devices. Here, we demonstrate that incorporating AgBiSe2 can concurrently regulate the electrical and thermal transport properties as well as improve the mechanical performance of n-type Bi2Te2.69Se0.33Cl0.03 for high thermoelectric performance. Among these, AgBiSe2 effectively enhanced the Seebeck coefficients of n-type Bi2Te2.69Se0.33Cl0.03 due to the reduced carrier concentration and reduced the thermal conductivity of n-type Bi2Te2.69Se0.33Cl0.03 owing to the enhanced phonon scattering by AgBiSe2 as well as its low thermal conductivity nature. Consequently, the simultaneous optimization of electrical and thermal transport properties enables us to achieve a maximum ZT of ∼1.21 (at ∼353 K) and an average ZTave of ∼1.07 (300–433 K) for 3.5 wt % AgBiSe2-incorporated Bi2Te2.69Se0.33Cl0.03, which are ∼25.62 and ∼23.36% larger than those of Bi2Te2.69Se0.33Cl0.03, respectively. This work proves that the incorporation of AgBiSe2 is an efficient way to improve the thermoelectric performance of bismuth telluride-based materials.
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PubMed
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