Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Yubing Cao,Ruitong Gao,Junwei Lei,Yuandong Hou,Min Xu,Shuang Cao,Zhaojun Chen,Yajing Duan,Hui Du
Pyrolysis presents a promising pathway for the chemical recycling of waste plastics. However, the pyrolysis of chlorine-containing plastics can generate hazardous chlorinated compounds. Therefore, it is critical to investigate the migration, transformation, and removal of chlorine during pyrolysis to enable environmentally sustainable recycling. In this study, we combined kinetic analysis with in-situ FTIR and TG-FTIR-MS to elucidate the mechanisms of chlorine migration and transformation during the pyrolysis of chlorinated mixed plastics (CMPs). An efficient dechlorination process using calcium-based additives was also developed. The results indicate that the pyrolysis of CMPs occurs in two distinct stages (Stage Ⅰ and Stage Ⅱ), with average apparent activation energies (Ea) of 166.69 kJ/mol and 243.86 kJ/mol, respectively. The process followed mechanism functions involving diffusion, nucleation, and phase boundary reactions. Initially, weak C–Cl and C–H bonds ruptured preferentially, releasing HCl. This was followed by synergistic cleavage of the main C–C chains, generating radicals such as methyl (·CH₃), butyl (·C₄H₉), propylene (·C₃H₅), and phenyl (·C₆H₅). The combination of these radicals with free chlorine radicals (·Cl) resulted in the formation of diverse and complex chlorinated organic compounds. For dechlorination, Ca(OH)₂ was identified as the optimal calcium-based additive, achieving a chlorine removal efficiency of 97.75 %, attributed to its self-decomposition behavior. This study clarifies the transformation pathways of chlorinated pollutants during pyrolysis and proposes a practical calcium-based dechlorination strategy to support sustainable chlorine management in the valorization of plastic waste.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2025
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IF 2.1
Ruxue Yao,Yang Ge,Jiangtao Song,Fei Yuan,Yafei Guo,Tianlong Deng
The Qaidam Basin has potassium- and calcium-rich oil field brine resources at high temperatures. Since the phase diagram is a powerful tool to guide the separation and purification of inorganic chemical engineering for the development of potassium resources in oil field brine, the quaternary oil field brine system (Na+, K+, Ca2+//Cl– -H2O) and its two subsystems ((Na+, Ca2+//Cl– -H2O) and (K+, Ca2+, //Cl– -H2O)) at 338.15 K were reported for the first time by the isothermal dissolution equilibrium method. The compositions of the equilibrium solid phases were analyzed and identified by combined chemical analyzing and X-ray diffraction. The quaternary system has four crystallized regions corresponding to NaCl, KCl, KCl·CaCl2, and CaCl2·2H2O at 338.15 K, and the incongruent double salt KCl·CaCl2 occurred at 338.15 K. The study facilitates the enrichment of thermodynamic data and exploits brine-based potassium resources.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Wenqing Li,Shimin Zhang,Songchao Shi,Xiaoying Cheng,Chongwei An,Jingyu Wang,Baoyun Ye
Realizing the balance between high energy density and multifunctionality of energetic materials is a hot spot in current research, and its study is of great significance for the application of energetic materials. Regulating microstructure is widely recognized as an effective strategy for solving such problems. In this paper, four different microstructures of Hexanitrohexaazaisowurtzitane(CL-20)/1,1-diamino-2,2-dinitroethylene(FOX-7) composite microspheres, namely, hollow, porous irregular microspheres, porous microspheres, and layered porous microspheres, were prepared by microchannel recrystallization technology. The effects of crystal precipitation rate, binder mechanical properties, and purity of water phase on the microstructure of composite microspheres were systematically investigated. The four prepared samples were spherical particles with regular morphology and uniform particle size. The angle of repose and mechanical sensitivity tests showed that the CL-20/FOX-7 composite microspheres had good dispersibility and mechanical sensitivity. Ignition experiments show that hollow microspheres have the best energy release efficiency, while porous microspheres have higher energy density and more stable energy release efficiency. The results show that the combustion performance and safety of the composite microspheres can be effectively enhanced by adjusting the microstructure. Microchannel recrystallization technology can realize the controllable preparation of the microstructure of composite microspheres, which provides a reference for the design and preparation of other composite microspheres.
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高影响因子
POWDER TECHNOLOGY
·
2025
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IF 4.6
Wenyu Wu,Wenjie Liu,Meijie Li,Penglin Kang,Dongqian Fan,Xiaodong Li,Shuangqi Hu
Regulating the structure of energetic materials to enhance safety performance has become a hot topic for researchers in recent years. This study prepared spherical co-aggregated CL-20/HMX with controllable microstructure using a combination of microfluidic and self-assembly strategies within a modular micro-reaction system. The morphology and agglomeration structures of CL-20/HMX particles were investigated with different mixing plates, solvent/nonsolvent flow rate ratio, and solvent content. Spherical co-aggregated CL-20/HMX co-crystals were prepared under optimized conditions, and the formation mechanism was analyzed. The impact of the spherical aggregation structure on the thermal properties and mechanical sensitivity was thoroughly studied. The results indicate that the spherical co-aggregated CL-20/HMX was assembled from lamellar nanoparticles, controlling CL-20 crystal morphology at the molecular level. CL-20/HMX co-aggregated microspheres exhibit higher mechanical safety and thermal stability than conventional reaction samples and physical mixing samples. Combining spherical aggregation structures and a microfluidic approach enhances thermal decomposition stability and improves safety. This research offers a novel strategy for developing and fabricating other energetic materials.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2018
·Vol. 25
·期 18
·18001-18014
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IF 2.8
Xu Zhengming,Han Dexia,Li Yuan,Zhang Pingling,You Lijun,Zhao Zhengang
In this study, the FPA90-Cl resin was magnetized with supported Fe 3 O 4 particles using a chemical co-precipitation method and its removal performance of bromate and coexisting precursors was explored. The magnetized FPA90-Cl resin was structurally characterized by SEM, FT-IR, and XRD. The effects of the initial concentrations, temperature, and resin dosage on bromate and bromide ion removal in drinking water were investigated using batch experiments. The magnetized FPA90-Cl resin exhibited a high removal efficiency for bromate and bromide ions at three initial concentrations, and the residual bromate concentrations were under the maximum contaminant level (MCL) of 10 μg L −1 after 80 min. The adsorption data of bromate and bromide ion could be well described by a pseudo-first-order kinetic model ( R 2 ˃ 0.98). The bromate removal alone was further studied by varying the initial solution pH, temperature, and competitive anions. The results showed that the magnetized FPA90-Cl resin could be used over a wide pH range (4.0–9.0). The maximum sorption capacity of the magnetized FPA90-Cl resin for bromate reached 132.83 mg g −1 at 298 K. The Freundlich and Redlich-Peterson isotherm models fit the bromate adsorption equilibrium better ( R 2 ˃ 0.99) than the Langmuir isotherm model ( R 2 ˃ 0.98). The thermodynamic analysis showed that the bromate adsorption process was endothermic. The negative ΔG and positive ΔS indicated that the process was spontaneous and that randomness increased after adsorption, respectively. The competition of coexisting anions with bromate was in the order of SO 4 2− > CO 3 2− > Cl − > NO 3 − > HCO 3 − > PO 4 3− . Additionally, the magnetized FPA90-Cl resin could maintain a high bromate and bromide ion adsorption capacity after five cycles of regeneration by a 0.1 M NaCl solution.
Graphical abstract
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PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
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IF 6.2
Qi Zhang,Minghui Li,Zhuofan Zuo,Tianhang Zhan,Xiaoyan Li,Wei Zhang
Cotton, as one of the world’s most crucial economic crops, suffers from a markedly shortened service life of its fabrics due to microbial degradation. In this study, N-isopropylacrylamide (NIPAM) containing amide bonds was grafted onto cotton fibers via atom transfer radical polymerization (ATRP) to develop a heat-resistant and wash-durable N-halamine functionalized cotton fabric (PN@CF-Cl). The resulting material exhibited rapid and potent antibacterial activity, killing over 85 % of bacteria within 1 min of contact and achieving > 99.9 % inactivation of Staphylococcus aureus and Escherichia coli within 10 min. After 50 washing cycles at 75 °C, the antibacterial activity retention remained above 97 %. Following storage for 30 days, rechlorination restored the active chlorine content to its initial level. Even after 10 consecutive chlorination–reduction cycles, the active chlorine recovery reached 98.9 %. In addition, the fabric demonstrated high hydrophobicity, air permeability, and moisture vapor transmission. Molecular dynamics (MD) simulations further validated the dynamic interconversion between N–Cl and N–H in the material, elucidating the underlying mechanism for its regenerative performance. Functionalized cotton fabrics based on the N–Cl/N–H dynamic cycling mechanism can extend product lifespan and hold significant promise for applications in medical protective equipment and smart home textiles.
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高影响因子
Advanced Optical Materials
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2025
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IF 7.2
Lin Shi,Junchun Li,Zengce Liu,Ping Chen,Yang Jiang
Rare-earth metal halides have emerged as a compelling class of luminescent materials, offering an environmentally benign alternative to toxic lead-based halides. This work reports the successful synthesis of Cs 3 CeX 6 (X = Cl, Br, I) with tunable emission and excellent photoluminescence quantum yield (PLQY) of Cs 3 CeCl 6 . Through controlled halogen substitution in the Cs 3 CeX 6 (X = Cl, Br, I) system, composition-dependent emission redshift (Cl→Br→I) is observed. Among them, Cs 3 CeCl 6 achieves a photoluminescence quantum yield (PLQY) of 99.89%, significantly surpassing the 92.57% PLQY of Cs 3 CeBr 6 and the 7.53% PLQY of Cs 3 CeI 6 , meanwhile surpassing that of most previously reported lead-free metal halides, highlighting its exceptional potential for efficient luminescent applications. Thermal stability analysis reveals that Cs 3 CeCl 6 maintains remarkable emission efficiency at elevated temperatures, retaining > 85% of its room-temperature luminescence intensity at 438 K, compared to only 60% for Cs 3 CeBr 6 and a mere 10% for Cs 3 CeI 6 . The exceptional thermal robustness originates from their characteristically high activation energies for thermal quenching, which effectively suppress non-radiative relaxation pathways. White light-emitting diodes (LEDs) based on Cs 3 CeI 6 exhibit a remarkable color rendering index (R a ) of 95.1, in contrast to those based on Cs 3 CeCl 6 (R a = 77.6) and Cs 3 CeBr 6 (R a = 79.6); all WLEDs based on Cs 3 CeX 6 (X = Cl, Br, I) demonstrate excellent atmospheric stability. With near-unity PLQY and remarkable thermal stability of Cs 3 CeCl 6 , coupled with the outstanding white LEDs performance of Cs 3 CeI 6 , Cs 3 CeX 6 (X = Cl, Br, I) compounds emerge as promising candidates for next-generation environmentally friendly optoelectronic applications, particularly in advanced display technologies and solid-state lighting systems. This work contributes to the advancement of eco-friendly emitters with both high efficiency and practical utility in next-generation optical technologies.
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高影响因子
Waste Disposal & Sustainable Energy
·
2021
·Vol. 3
·期 2
·107-115
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IF 0
Zhou Junshuang,Wei Kuo,Tian Lina,Hao Zhuoran,Bian Ying,Wang Yuanzhe,Gao Faming
The complicated structured dyes produced by the textile industry have become a serious problem in the last few decades, which can be attributed to their stable chemical structures and difficult to degrade. Therefore, in this article, we described a method to fix dye macromolecules by flocculation process and then transform the colloid to N, S, Cl-doped porous carbon materials. This material can effectively improve the capacity and cycle stability of lithium ion batteries, and recycle the dyes in the water. The N, S, Cl-doped porous carbon materials show a superior electrocatalytic performance of 473.5 mAhg −1 at the current density of 100 mAg −1 after 60 cycles. The present work combines the lithium ion batteries with dyes waste treatment and has a broad prospect for development.
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DOI
LANGMUIR
·
2021
·
IF 3.882
Cong Xie,Yubin Zhao,Wenbin Shi,Ping Yang
The existing defects on the surface of CsPbX3 nanocrystals (NCs) resulted in the decrease of the photoluminescence quantum yields (PLQYs) of NCs. In this study, we developed a simple strategy, which can make the treated CsPbX3 NCs exhibit high PLQYs and better stability by CdX2 post-treatment at room temperature. The treated CsPbX3 NCs were characterized by X-ray diffraction (XRD) patterns and PL spectra. The shape, size, and crystal structure of the NCs remained unchanged after Cd ion treatment. The PLQYs of CsPbCl3 increased from 24 to 73% and the PLQYs of CsPbBr3 NCs increased from 85 to 92% after treatment. The significant enhancement of PLQYs is ascribed to the effective passivation of surface defects, in which Cd2+ and X– ions occupied the Pb–X vacancies existing on the surface of the NCs. In addition, this strategy was also applied to a mixed halide perovskite. The practical application of CsPbX3 NCs will be extended by this method.
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高影响因子
CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Ziyu Pan,Bin Liu,Bo Wang,Yingchao Liu,Tingyu Si,Wencai Yi,Yangqing Wu,Jinkai Li,Bingqiang Cao
Lead-free double-perovskite Cs 2 SnX 6 (X = Cl, Br, I) containing Sn 4+ is a more stable lead-free photovoltaic material than its homologue CsSnX 3 . However, its stability in air still affects its application. In this Letter, lead-free inorganic Cs 2 SnX 6 (X = Cl, Br, I) nanocrystals (NCs) were synthesized by a hot injection method and in-situ loaded into mesoporous SiO 2 . With the change of halogen content, the PL emission peak of pristine Cs 2 SnX 6 NCs were tuned from 430 nm to 780 nm covering the visible and near infrared spectrum region. Taking Cs 2 SnI 6 /SiO 2 NCs as an example, the optical property stability in solution is obviously improved, and it can be stored in air for over 2 h. Especially, the more stable NIR emission, non-toxicity and easy hydrolysis characteristics of Cs 2 SnX 6 /SiO 2 composite nanoparticles will have potential medical applications like photothermal and photodynamic therapies for cancers.
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高影响因子
LANGMUIR
·
2021
·
IF 3.882
Sai-Nan Guo,Hao Wu,Dan Wang,Jie-Xin Wang
Lead halide perovskite quantum dots (QDs) are known as prospective optoelectronic device materials because of their excellent luminescence, extraordinary photoelectric performance, and specific octahedron framework. Herein, we report a cost-effective approach for synthesizing highly stable CH3NH3PbBr3 QDs in low-polarity binary solvents without nitrogen protection. The CH3NH3PbBr3 QDs are tunable from 1.2 to 4.2 nm by adjusting the proportion of oleic acid and oleylamine as capping ligands. The photoluminescence quantum yield of CH3NH3PbBr3 QDs can reach 87.4%. The fluorescence can maintain over 80% of its earliest emission intensity under the atmosphere after 5 days, which is much better than that (∼10%) of QDs with ligand-assisted reprecipitation. The possible reaction mechanism of preparing CH3NH3PbBr3 QDs was also addressed. Notably, such a strategy can be applied extensively in the preparation of other lead halide perovskite QDs. Furthermore, the as-prepared thick PMMA-coated CH3NH3PbBr3 QDs were further conjoined with a red luminescence powder on a blue InGaN chip to obtain a powerful efficiency (45.4 lm W–1) warm white light-emitting diode.
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高影响因子
CRYSTENGCOMM
·
2023
·Vol. 26
·期 4
·557-565
·
IF 3.1
Jiaqiang Ding,Bingyu Xiao,Jinqiu Wu,Dongliang Chen,Dongling Huang,Zuochun Xiong
Poly(ε-caprolactone-co-trimethylene carbonate) (PCLTMC) is a biodegradable copolymer, which is widely used for medicine and tissue repair systems, and its morphology, degradation and mechanical properties have been extensively investigated. However, its crystallization behavior with different copolymerization ratios has not been studied systematically, which is of great significance for the study of property regulation and an understanding of the crystallization behavior of random copolymers. In this paper, the relationship between the crystallization temperature Tc, melting point temperature Tm and crystallinity Xc of copolymers with different molar ratios was determined by differential scanning calorimetry (DSC) using a non-isothermal crystallization method. The results show that the melting point and crystallinity of the copolymer decrease with an increase in TMC composition. The equilibrium melting point of the copolymers was predicted by an isothermal crystallization method, using the Hoffman–Weeks extrapolation method and crystallization rate growth fitting method both based on Lauritzen–Hoffman theory. It is proved that Lauritzen–Hoffman theory is of great significance for guiding the kinetic behavior of PCLTMC crystallization.
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高影响因子
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