Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Xin Lei,Yu Lei,Shuangshuang Cheng,Xin Yang
N -nitrosamines are great concern in potable water reuse. This study investigated the reaction kinetics of chlorine radicals (Cl • and Cl 2 •− ) with N -nitrosamines. The second-order reaction rate constants of Cl • ( k Cl • ) and Cl 2 •− ( k Cl2 •− ) with eight N -nitrosamines at pH 7.0 varied in the range of (5.02 ± 0.41)–(57.1 ± 4.25) × 10 8 M −1 s −1 and (0.46 ± 0.04)–(10.6 ± 0.73) × 10 8 M −1 s −1 , respectively. The numbers of methylene groups (#−CH 2 −) showed a good positive correlation with k Cl • (R 2 = 0.71), but not with k Cl2 •− . The degradation of eight N -nitrosamines under UV/chlorine advanced oxidation process (AOP) slightly increased by 1–18% in contrast to UV irradiation alone, and Cl − in the AOPs cannot inhibit their removal. The results improved the understanding of the fate of N -nitrosamines in chlorine radical-involved AOPs.
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CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Jie Xue,Ziyu Wang,Andrew Comstock,Zhiyu Wang,Herman H. Y. Sung,Ian D. Williams,Dali Sun,Junwei Liu,Haipeng Lu
Recent discoveries of novel physics in two-dimensional (2D) magnetic materials have sparked the search of new layered magnetic semiconductors. Compared to the traditional inorganic 2D van der Waals crystals, hybrid organic–inorganic metal–halide frameworks offer significantly enhanced chemical and structural versatility, where their optical, electronic, and magnetic properties can be readily modulated with both organic and inorganic components. Here, we reported a series of new Fe–Cl-based layered double perovskites LnMIMIIICl8, [n = 4, L = phenylethylammonium or chiral R-(+)-β-methylphenethylammonium and n = 2, L = 1,4-butanediammonium; MI = Ag/Na; MIII = Fe/In]. UV–vis measurements show that their optical band gaps are highly tunable by varying the organic cations, MI ion, and MIII ion. Magnetic susceptibility measurements suggest an antiferromagnetic coupling between the nearest FeIII–FeIII, where the Curie–Weiss temperature, Néel temperature, and frustration factors can be easily modulated with their compositions and dimensionality. Our study demonstrates the rich and interesting magnetic properties in these layered transition-metal–halide double perovskites and paves the way for design of multifunctional magnetic materials.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 25
·e202104463
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IF 5.02
Yue Liu,Yuxiang Wang,Haoran Cheng,Zheng Ma,Qian Li,Gang Wang,Daocheng Pan,Limin Wang,Jun Ming
Graphical A new soluble CsPbX 3 precursor to in-situ prepare luminescent CsPbX 3 nanocrystal film in the air readily was designed. The composition of the CsPbX 3 NCs films can be tuned by changing the solution precursors, allowing obtaining a high color purity and a narrow emission width. Inorganic cesium lead halide perovskite nanocrystals are candidates for lighting and display materials due to their outstanding optoelectronic properties. However, the dissolution issue of perovskite nanocrystals in polar solvents remains a challenge for practical applications. Herein, we present a newly designed one-step spin-coating strategy to prepare a novel multicolor-tunable CsPbX 3 (X=Cl, Br, I) nanocrystal film, where the CsPbX 3 precursor solution was formed by dissolving PbO, Cs 2 CO 3 , and CH 3 NH 3 X into the ionic liquid n-butylammonium butyrate. The as-designed CsPbX 3 nanocrystal films show high color purity with a narrow emission width. Also, the blue CsPb(Cl/Br) 3 film demonstrates an absolute photoluminescence quantum yields (PLQY) of 15.6 %, which is higher than 11.7 % of green CsPbBr 3 and 8.3 % of red CsPb(Br/I) 3 film. This study develops an effective approach to preparing CsPbX 3 nanocrystal thin films, opening a new avenue to design perovskite nanocrystals-based devices for lighting and display applications.
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NANOTECHNOLOGY
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2020
·Vol. 31
·期 21
·215605
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IF 3.551
Yu-Wei Liu,Shao-Hong Guo,Si-Qi You,Chun-Yi Sun,Xin-Long Wang,Liang Zhao,Zhong-Min Su
Halide perovskites have been employed as photocatalysts for CO2 photoreduction due to their excellent optical properties and unique electronic structure. However, their photocatalytic performance is relatively poor. Herein, we demonstrate a new strategy with Mn-doped CsPb(Br/Cl)3 mixed-halide perovskites as catalysts to enhance the efficiency of CO2 photoreduction. By tuning the content of Mn, a series of CsPb(Br/Cl)3:Mn perovskites are obtained and show high efficiency in CO2 conversion to CO and CH4. For the optimum catalyst sample, especially, the yields of CO and CH4 reach 1917 μmol g−1 and 82 μmol g−1 which are 14.2 and 1.4 times higher than those of CsPbBr3. This work provides new insights into improving the reactivity of perovskites in CO2 photoreduction.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2013
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IF 2.04
Lingyun Dong,Shilie Pan,Hongping Wu,Xin Su,Hongwei Yu,Ying Wang,Zhaohui Chen,Zhenjun Huang,Zhihua Yang
A series of lead-containing halogen oxyborates, Pb 6 B 3 O 10 X ( X =F, Cl, Br), have been grown by high-temperature solution method and their crystal structures were determined by single-crystal X-ray diffraction. They are isostructural and crystallize in the space group Pbcm of the orthorhombic crystal system . The crystal structures are dominated by one-dimensional ∞ [(Pb 4 O)(BO 3 ) 3 ] “ Zig-Zag ”-chains, while the remaining Pb atoms and X ( X =F, Cl, Br) atoms are filled to balance the charge. Compared with the previously reported compound Pb 4 O(BO 3 ) 2 (the molecular formula Pb 4 O(BO 3 ) 2 can be regarded as Pb 6 B 3 O 10.5 ) with the space group Aba 2, the structures of Pb 6 B 3 O 10 X ( X =F, Cl, Br) are completely different from that of Pb 4 O(BO 3 ) 2 . IR spectroscopy , UV–vis-NIR diffuse reflectance spectroscopy , thermal analysis, and theoretical calculations were also performed on the reported materials.
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CRYSTENGCOMM
·
2025
·
IF 2.6
Justin Darku Quansah,Xuexue Zhang,Zhi-Hua Xue,Qi-Long Yan
Insensitive hybrid energetic crystals of 1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX) and 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (CL-20) were successfully synthesized by intercalation of triaminoguanidine-glyoxal crosslinked graphene oxide (GO-TAGP) at varying concentrations (0.5–2.0 wt%). The resulting composites exhibited enhanced density (3.2% increase for GO–TAGP modified HMX and 2.8% for GO-TAGP modified CL-20) and improved thermal stability, attributed to strong interfacial interactions between the GO-TAGP and the energetic molecules. This study investigates the correlation between GO-TAGP content and mechanical properties, which critically influence the initiation sensitivity of these hybrid nitramine crystals. Nanoindentation tests revealed a 14% increase in maximum load capacity (from 35 mN to 40 mN) for GO-TAGP reinforced HMX compared to pure β-HMX, along with a 10% higher displacement before failure. Similarly, GO-TAGP modified CL-20 demonstrated a 17% improvement in elastic modulus (from 8.7 GPa to 10.2 GPa) and a 22% increase in hardness (from 0.45 GPa to 0.55 GPa) at optimal GO loading. The elevated modulus values confirm that GO-TAGP reinforcement significantly enhances structural rigidity, enabling the composites to endure greater mechanical stress without deformation. Concurrently, the hardness improvements suggest superior resistance to localized plastic deformation, indicative of a more robust interfacial bonding within the modified crystal lattice. These enhancements contribute to reduced mechanical sensitivity, ensuring safer handling and storage of these high-energy materials.
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MATERIALS TECHNOLOGY
·
2021
·
IF 3.846
Ling Chen,Yang Qin,Xinfu Cao,Jianbing Gao,Shishuo Liu,Yang Zhang,Jing Tu,Yingbo Wang,Jie Liu,Weidong He
In this study, a novel nitrated bacterial cellulose/2,4,6,8,10,12-Hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane/ammonium perchlorate nanoenergetic composite was successfully prepared by the sol–gel method and the freeze-drying technology. The structure and composition were characterised by means of scanning electron microscope, X-ray diffractometer and Fourier-transform infrared. The results demonstrated that the structure of the gel nanoparticles was granted with unique network cross-linked porous, wherein the hexaazaisowurtzitane and ammonium perchlorate nanoparticles were embedded and dispersed uniformly in the gel matrix. The thermal decomposition properties of composites were analysed by differential scanning calorimeter-thermogravimetric analysis, and the results revealed that the composites exhibited only two exothermal peaks which correspond to the nitrated bacterial cellulose/hexaazaisowurtzitane and ammonium perchlorate. In addition, the impact and friction sensitivities of composites were also performed and showed outstanding safety performance. Hence, this preparation strategy of nitrated bacterial cellulose-based nanocomposite energetic materials may provide promising application in high-performance and low-sensitivity propellants.
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Processes
·
2021
·Vol. 9
·期 4
·652
·
IF 2.847
Huanong Cheng,Na Li,Rui Zhang,Ning Wang,Yuanyuan Yang,Yun Teng,Wenting Jia,Shiqing Zheng
The solubility of hydrogen sulfide in different mole ratios of ferric chloride and 1-butyl-3-methylimidazolium chloride ionic liquid (rFeCl3/[bmim]Cl,r= 0.6, 0.8, 1.0, 1.2, 1.4) at temperatures of 303.15 to 348.15 K and pressures of 100 to 1000 kPa was determined. The total solubility increased with the increase of pressure and the decrease of temperature. The solubility data were fitted using the reaction equilibrium thermodynamic model (RETM). The mean relative error between the predicted value and the measured value was less than 4%. Henry’s coefficient and the equilibrium constant of chemical reaction at each temperature were calculated. Henry’s coefficient first decreased and then increased with the increase of mole ratio, and increased with the increase of temperature. The equilibrium constant of the chemical reaction followed the same law as Henry’s coefficient. The chemical solubility was related to both Henry’s coefficient and the chemical equilibrium constant. H2S had the highest chemical solubility in FeCl3/[bmim]Cl at a mole ratio of 0.6 and a temperature of 333.15 K. The chemical solubility increased with the increase of pressure.
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Nanoscale
·
2019
·Vol. 11
·期 13
·6182-6191
·
IF 6.97
Jinjin Ma,Qianting Yao,John A. McLeod,Lo-Yueh Chang,Chih-Wen Pao,Jiatang Chen,Tsun-Kong Sham,Lijia Liu
Inorganic lead halide perovskite CsPbX3 (X = Cl, Br, or I) nanocrystals are promising candidate materials for light-emitting devices and optoelectronics. Mn-Doped CsPbX3 is of particular interest, as the Mn-doping introduces an additional emission band, making this material a promising white-light emitter. In this study, Mn-doped CsPb(Br/Cl)3 nanocrystals are prepared at room-temperature and ambient pressure. The chemical environment of Mn, and the luminescence of these nanocrystals are analyzed in detail using X-ray diffraction (XRD), extended X-ray absorption fine structure (EXAFS), X-ray absorption near-edge structure (XANES) and X-ray excited optical luminescence (XEOL). Although the introduction of Mn does not alter the long-range order of the CsPbX3 crystal, it leads to a local lattice contraction with the bond length of Mn–X much shorter than Pb–X. We also find excitation energy-dependence in both the intensity and wavelength of the perovskite excitonic emission band, while only in intensity of the Mn emission band. Detailed fitting of the XEOL reveals that the perovskite emission band is dual-channel, and it is the excitation energy-dependent intensity variation of these two channels that drives the observed red-shift of the combined emission band. Our findings also confirm that the Mn emission band is driven by exciton-Mn energy transfer and clarify the Mn chemical environment and the luminescence mechanism in Mn-doped CsPb(Br/Cl)3 nanocrystals.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2025
·
IF 11.3
Mingming Wang,Yurui Fan,Qinyuan Hong,Wenjun Huang,Xing Han,Zan Qu,Naiqiang Yan,Haomiao Xu
Mercury emissions from acetylene hydrochlorination processes in polyvinyl chloride (PVC) production pose severe environmental risks yet remain poorly quantified due to methodological limitations in high-reactivity C2H2/HCl atmospheres. We reported an advanced operando mercury speciation platform named PVC-OHM, engineered through systematic optimization of the Ontario Hydro method (OHM), achieving simultaneous real-time detection of elemental mercury (Hg0) and divalent mercury (Hg2+) with unprecedented sensitivity (0.12 μg/m3) under industrially relevant conditions. Our mechanistic investigation reveals three dominant mercury escape pathways: (1) thermal desorption, wherein localized hotspots accelerate HgCl2 decomposition and elevate the saturated vapor pressure at carbon-mercury interface (from 0.9 to 20.3 atm), contributed to 80% of total Hg loss; (2) C2H2 driven reductive decomposition of HgCl2 catalyst at carbon–mercury interfaces, responsible for 65–78% of Hg0 emissions and (3) excess chlorine adsorption-induced desorption ([HgCl2/AC] Cl5, Eads > 0) accounting for >10% of Hg2+ emissions. Quantitative tracking demonstrates alarming mercury loss of per gram catalyst (5 wt % Hg) reached as 3.08 mg Hg0 and 9.01 mg Hg2+, directly linked to localized thermal gradients (ΔT = 250–300 °C) at reaction hotspots. This work establishes the first experimentally validated framework for mercury fate prediction in carbide-based PVC synthesis, providing actionable strategies for emission control through hotspot mitigation and coordination environment optimization.
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ChemistrySelect
·
2025
·Vol. 10
·期 34
·e01982
·
IF 2
Ying Wu,Xiaolan Song,Jun Zhang,Yi Wang,Chongwei An
To prepare silica-based composite energetic materials with regular shape, good dispersion, and uniform particle size and thus improve their combustion performance and safety and better apply them in solid propellants, in this study, nSi (nanosilica powder)/NC/CL-20 composite microspheres were prepared by fluid-focused microchanneling with nitrocellulose (NC) as a binder and nSi nanopowder and CL-20 as raw materials via droplet microfluidics. Orthogonal experiments were conducted to determine the optimal process parameters for preparation, ultimately resulting in the successful synthesis of composite microspheres with uniform particle size and good sphericity. Additionally, this study characterized the thermal decomposition properties and combustion performance of three types of composite microspheres (nSi/NC/CL-20, µSi (micron-sized silicon powder)/NC/CL-20, and NC/CL-20). The results showed that the activation energy of nSi/NC/CL-20 reached 530.95 kJ/mol, higher than that of µSi/CL-20/NC (211.19 kJ/mol) and CL-20/NC (210.50 kJ/mol); its 5-second burst point temperature was the highest, reaching 590.33 °C. In terms of combustion performance, nSi/NC/CL-20 exhibited significantly superior maximum pressure (1.22 MPa) and pressure rise rate (1.6 MPa/s) compared to the other two samples. These results clearly demonstrate that the addition of nanosilica powder can effectively improve the thermal stability and combustion performance of composite microspheres. Graphical In this study, droplet microfluidic technology is used to prepare nSi/NC/CL-20 composite microspheres with regular shape, good dispersibility and uniform particle size. Studies show that the addition of nano-silicon powder (nSi) can significantly improve the thermal stability and combustion performance of these composite microspheres, enabling them to be more effectively applied in the field of solid propellants.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 20
·14046-14054
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IF 4.449
Qingxin Zeng,Tingting Yan,Kai Wang,Yinyan Gong,Yong Zhou,Yongli Huang,Chang Q. Sun,Bo Zou
In situ Raman spectroscopy revealed that transiting H2O/NaX (∼64) solutions into an ice VI phase and then into an ice VII phase at a temperature of 298 K requires excessive pressures with respect to pure water. The increase of the critical pressures varies with the solute type in the Hofmeister series order: X = I > Br > Cl > F ∼ 0. The results suggest that the solute hydration creates electric fields that lengthen and soften the O:H nonbond and meanwhile shorten and stiffen the H–O bond through O–O Coulomb repulsion. Compression, however, does the opposite to solute electrification upon the O:H–O bond relaxation. Therefore, compression of the aqueous solutions recovers the electrification-deformed O:H–O bond first and then proceeds to the phase transitions, which requires excessive energy for the same sequence of phase transitions. Ice exclusion of solute disperses the frequencies of characteristic phonons and the critical pressures with unlikely new bond formation.
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