VACUUM
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2025
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IF 3.9
Fan Du,Ying Zhu,Sisi Chen,Yuwen Deng,Fei Wang,Kai Li,Lei Shi,Xin Sun
The copper smelting industry generates significant gypsum waste, primarily composed of calcium sulfate (CaSO 4 ), which can be utilized as a sulfur source for hydrogen sulfide (H 2 S) production. This study explores an optimized process for H 2 S generation via hydrolysis of calcium sulfide (CaS), produced by vacuum carbothermal reduction of gypsum. The results show that: 1) CaSO 4 is reduced to CaS under vacuum carbothermal conditions, and subsequent hydrolysis efficiently produces H 2 S; 2) key parameters, including reduction temperature, carbon content, and recovery time, significantly influence CaS yield; 3) under optimized conditions (hydrolysis temperature, reaction time, and solid-liquid ratio), H 2 S concentrations exceeded 8000 ppm, and high-purity H 2 S gas was achieved, meeting industrial requirements for further processing. Thermodynamic analysis and characterization of reaction intermediates provided insights into the underlying mechanisms, highlighting the critical role of temperature and phase composition in optimizing H 2 S production. Kinetic analysis further clarified that the hydrolysis process follows a diffusion-controlled mechanism, with the temperature dependence of the reaction rate constant ( k ) aligning with the Arrhenius equation. This optimized approach offers a sustainable pathway for utilizing gypsum from copper smelting, contributing to sulfur resource recovery, waste reduction, and high-purity H 2 S production for industrial applications.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2024
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IF 6.9
Li Chao,An Xuebin,Jing Hu,Yixiao Wang,Shizhao Wang,Yunshan Wang,Gang Yang,Yong Sun
s This paper reports an enhanced approach of thermal reduction of phosphogypsum (PG) in the presence of sodium chloride (NaCl) in its molten phase. The thermodynamic together with in-situ thermogravimetric-Fourier transform infrared spectroscopy (TG-FTIR) result indicates the yield of CaS (solid) at the investigated temperature range (800–850 °C). Addition of NaCl not only appreciably reduces the activation energy of this reaction (800–850 °C) on average from 315 to 175 (kJ·mol −1 ) materially, but also significantly improve the conversion from CaSO 4 to CaS. Additionally, the NaCl based waste salt (NaCl-WS) containing organic compounds (0.21 wt%) was found to produce similar results when compared with the pure NaCl addition at investigated temperature range. The optimal conditions via parametric optimization: i.e., 800–850 °C, 15 wt% (NaCl-WS), and 6 (ratio of PG/C (carbon) wt/wt), were determined. The mechanistic study together with using density functional theories (DFT) shows that the synergistic effect by NaCl addition was caused by the coupled-vacancy diffusion mechanism when NaCl melts at high temperature and C atom shows proximity to oxygen (O) atom from the SO 4 2- cluster in the CaSO 4 crystallite structure. The evaluation of the process shows appealing advantages over the conventional PG thermal reduction. By carefully manipulating temperature range together with the NaCl-WS addition, the proposed new process simultaneously realizes PG thermal reduction and environmental utilization of NaCl-WS.
研究领域:
化学工程
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环境科学
✓ 已验证
DOI
高影响因子
CARBON
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2020
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IF 8.821
Xiaohan Wang,Yukun Zhu,Xueqin Wang,Guiju Liu,Junzhi Li,Renhai Zhao,Yuanming Zhang,Xiaoli Zhang,Guangting Han,Haiguang Zhao,Jianyong Yu
Design and synthesis of heterostructured carbon nanofibers is significant for applications in the field of optoelectronics , conductors and catalytic devices. Although lignin has been widely used as building blocks for fabricating nanofibers , it is still very challenging to synthesize conducting heterostructured carbon nanofibers without using additional catalysts. Herein, we first in-situ grew graphene grafted carbon nanofibers (G/CNFs) using calcium lignin sulfonate as starting materials without addition of catalysts. Through the electrospinning, pyrolysis and washing procedure, the as-spun nanofibers are converted into the flexible G/CNFs films. The in-situ formed CaS nanoparticles serve as catalysts for the growth of graphene on the surface of the CNFs, when the carbonization temperature is over 1100 °C. The as-prepared G/CNFs films exhibit superior electronic conductivity of 2377.9 S m −1 , which is comparable to the values reported in the literature. As a proof-of-concept, the as-fabricated lithium-sulfur battery exhibits a high discharge of 808.7 mAh·g −1 after 600 cycles at 0.2 C by using the G/CNFs membrane as stand-alone and flexible sulfur cathode scaffolds. This work represents a promising new approach for designing heterostructured graphene/CNFs using low-cost lignin precursors, and provides significant insights for the sustainable development of CNFs in numerous applications.
研究领域:
材料科学
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纳米技术
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电化学
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可持续发展
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Anshuo Li,Shuzhen Chu,Meng Yuan,Jinhui Zhang,Hengrui Liu,Yuhui Zhu,Jingyi Xu,Xinquan Jiang,Weili Xue
In tumor therapy, copper (Cu)-based nanozymes with peroxidase-like activity play a crucial role in converting hydrogen peroxide into hydroxyl radicals ( OH). This process induces immunogenic cell death, which in turn activates the body’s immune response, enhancing the efficacy of tumor immunotherapy. Nonetheless, the efficiency of this reaction is curtailed due to the oxidation of Cu(I) to Cu(II), leading to the self-depletion of the nanozyme’s activity and an insufficient yield of OH for effective immunotherapeutic activation. To surmount this challenge, our research introduces a photocharging self-doped semiconductor nanozyme, copper sulfide (Cu 9 S 8 ). The photocharging effect enables the nanozyme to convert internal Cu(II) back to Cu(I) through charge transfer induced by near-infrared (NIR)-II photothermal energy, thereby effectively maintaining the enzyme-like activity of the nanozyme. Additionally, Cu 9 S 8 is enhanced with a calcium sulfide (CaS) coating. This coating reacts in the acidic microenvironment of tumors to generate hydrogen sulfide (H 2 S) gas, which in turn suppresses the catalase activity inherent in tumor cells, ensuring a plentiful supply of H 2 O 2 for the nanozyme’s operation. This dual strategy of amplifying enzyme-like activity and substrate availability culminates in the generation of ample OH within tumor cells, leading to significant immunogenic cell death and thereby realizing potent immunotherapy.
研究领域:
纳米技术
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生物医学工程
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癌症免疫治疗
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
Acta Pharmaceutica Sinica B
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2022
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IF 14.903
Chuchu Lin,Chenyi Huang,Zhaoqing Shi,Meitong Ou,Shengjie Sun,Mian Yu,Ting Chen,Yunfei Yi,Xiaoyuan Ji,Feng Lv,Meiying Wu,Lin Mei
Hydrogen sulfide (H 2 S) is the most recently discovered gasotransmitter molecule that activates multiple intracellular signaling pathways and exerts concentration-dependent antitumor effect by interfering with mitochondrial respiration and inhibiting cellular ATP generation. Inspired by the fact that H 2 S can also serve as a promoter for intracellular Ca 2+ influx, tumor-specific nanomodulators ( [email protected] ) have been constructed by encapsulating calcium sulfide (CaS) and indocyanine green (ICG) into methoxy poly (ethylene glycol) -b- poly (lactide -co- glycolide) (PLGA-PEG). [email protected] can achieve tumor-specific biodegradability with high biocompatibility and pH-responsive H 2 S release. The released H 2 S can effectively suppress the catalase (CAT) activity and synergize with released Ca 2+ to facilitate abnormal Ca 2+ retention in cells, thus leading to mitochondria destruction and amplification of oxidative stress. Mitochondrial dysfunction further contributes to blocking ATP synthesis and downregulating heat shock proteins (HSPs) expression, which is beneficial to overcome the heat endurance of tumor cells and strengthen ICG-induced photothermal performance. Such a H 2 S-boosted Ca 2+ -involved tumor-specific therapy exhibits highly effective tumor inhibition effect with almost complete elimination within 14-day treatment, indicating the great prospect of CaS-based nanomodulators as antitumor therapeutics.
研究领域:
纳米技术
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癌症研究
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药学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Xiao Wang,Bingcheng Lin,Jian Wang,Yunfeng Ma,Rong Jin,Guorui Liu,Minghui Zheng
Four inhibitors (CaO, CaS, CH 4 N 2 S, and (NH 4 ) 2 SO 4 ) were employed to inhibit the formation of multiple unintentional persistent organic pollutants (POPs) and environmentally persistent free radicals (EPFRs) using anthracene as a precursor, with CuCl 2 serving as both a transition metal catalyst and chlorine source. The inhibition mechanisms were elucidated in terms of chlorine immobilization, catalyst deactivation, and free radical regulation. The inhibition efficiency of the four inhibitors on polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), polychlorinated biphenyls (PCBs), and polychlorinated naphthalenes (PCNs) ranged from 64.7 % to 98.4 %, with the corresponding inhibition rates on toxic equivalency quantity ranging from 86.3 % to 99.7 %. The distribution of homologs shifted towards less chlorinated species, indicating effective suppression of chlorination. Calcium- and nitrogen-containing compounds consumed chlorine sources by forming CaCl 2 , CaClOH, and NH 4 Cl, while sulfur-containing compounds deactivated catalysts by forming CuSO 4 . EPFRs derived from anthracene were identified as carbon-centered anthracene-type and anthraquinone-type radicals. Positive correlations were observed between POPs and EPFRs concentrations, suggesting the pivotal role of organic free radicals as intermediates in POPs formation. Anthraquinones derived from anthracene underwent decomposition, recombination and chlorination, leading to the formation of PCDD/Fs and PCBs. The addition of inhibitors reduced EPFRs concentrations by 74.2–95.1 %. Sulfur- and nitrogen-containing inhibitors generated radicals that attacked POPs precursors and intermediates, forming heteroatomic compounds and inhibiting POPs formation. These findings enhanced the understanding of the source control mechanisms of POPs and provided theoretical and technical support for the synergistic inhibition of POPs and EPFRs in industrial thermal processes.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
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2024
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IF 11
Arif Rashid,Abdul Qayum,Syed Asim Shah Bacha,Qiufang Liang,Yuxuan Liu,Lixin Kang,Zhuzhong Chi,Runhao Chi,Xu Han,John-Nelson Ekumah,Muhammad Safiullah Virk,Xiaofeng Ren,Haile Ma
This study fabricated novel smart colorimetric film from pullulan (P) and sodium alginate (SA) incorporated with anthocyanin (ACNs) loaded casein carboxymethylcellulose (CAS-CMC-ACNs) nanocomplex for the freshness monitoring of the fish and shrimp . The ACNs loaded nanocomplex exhibited large particle size (176.902 ± 4.641 nm) than CAS-CMC (155.454 ± 4.152 nm) nanocomplex without ACNs, and can be loaded in P/SA film with uniform distribution. The P/SA film incorporated with CAS-CMC-ACNs nanocomplex had a more compact structure, improved barrier properties, mechanical strength, and thermal stability than P/SA film incorporated with free ACNs, which could be attributed to hydrogen bonding among the components in the film matrix, as confirmed by SEM micrographs and FT-IR. Intriguingly, the composite film exhibited antibacterial effect against gram-negative bacteria E. coli ( Escherichia coli ) and gram-positive bacteria S. aureus (Staphylococcus aureus) with inhibition zone of 7 ± 0.283 mm and 8.6 ± 0.141 mm, and antioxidant effect. The composite film demonstrated a visible response to CO 2 and pH buffer. Furthermore, the composite smart film demonstrated the potential to monitor the freshness of fish and shrimp stored at 25 °C for 24 h via a visual color change from pink to dark grey. The findings revealed that the fabricated film is an effective tool for evaluating the freshness of fish and shrimp.
研究领域:
食品科学
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材料科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
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2025
·
IF 4.7
Rui Xiao,Wen-Dong Yao,Wenhao Xing,Chunlan Tang,Wenwen Jiang,Sheng-Ping Guo,Wenlong Yin
Adjusting the structure of compounds through an anion partial substitution strategy is an effective means to explore nonlinear optical (NLO) materials. Here, a new oxysulfide Ca3Ge2O3S4 (CGOS) crystallized in the centrosymmetric (CS) space group P21/c was synthesized by a high-temperature solid–solid reaction. Taking CGOS as the parent, the first quaternary NLO Ca-based oxyselenide Ca3Ge2O4Se3 (CGOSe) crystallized in the noncentrosymmetric (NCS) space group R3m was obtained by anion partial substitution. The 0D structure of CGOS consists of isolated [Ge2O3S4] dimers, with Ca2+ ions located between dimers to balance the charge. The 0D structure of CGOSe consists of isolated and parallelly arranged [Ge2O4Se3] dimers, with Ca2+ ions located between dimers to balance the charge. The structural evolution between CGOS and CGOSe is elucidated. CGOSe has the widest band gap of 3.02 eV in the AE3Ge2O4Q3 (AE = Ca, Sr, Ba; Q = S, Se, Te) system. Apart from the obvious NLO activity, CGOSe exhibits a high laser-induced damage threshold of around 3.2 × AgGaS2. The theoretical calculation results show that the [Ge2O4Se3] dimer is the main source of the SHG response. This work enriches the relatively less-explored Ca-based oxychalcogenides as NLO materials.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Feng Zhu,Xingyun Hu,Linghao Kong,Xianjia Peng
Sulfide precipitation is an efficient method to remove Cu(II) and As(III) from strongly acidic wastewater, but the instantaneous release of H 2 S from traditional sulfuration reagents causes serious H 2 S pollution. Moreover, the obtained precipitates are mixtures of CuS and As 2 S 3 , leading to difficulties in resource recovery. In this study, a calcium sulfide-organosilicon complex (CaS-OSCS), in which CaS was coated into a matrix of {[O 1.5 Si(CH 2 ) 3 NH]CS} n (OSCS) via the coordination bonding, was developed. OSCS, as a matrix of CaS-OSCS, can ensure the sustained and stable release of H 2 S under strongly acidic conditions owing to its low swelling (1.75% swelling ratio) and excellent acid resistance. The release longevity of H 2 S from CaS-OSCS extended from 5 min up to 50 min compared with that from CaS because the hydrophobic OSCS prevented solution diffusing to the pores of CaS-OSCS and thus slowed down the hydrolysis of CaS in pores. 99% of Cu(II)/As(III) was precipitated without H 2 S escape, and the dosage of sulfuration reagents was reduced by 30%. In addition, CaS-OSCS improved the selective separation of copper from wastewater, and a separation factor between Cu(II) and As(III) reached 2376. This study provides a potential approach for the elimination of H 2 S pollution and selective recovery of copper.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Dongmei Li,Jiayue Zhou,Zhuxin Chang,Hongwei Zhao,Nan Zhang,Huan Xia,Linyuan Wang,Jie Zhao,Guanggui Yu,Zhongze Fang,Na Sai
A novel biomimetic molecular imprinted polymer chip with fluorescence (FL) and structural (STR) states, inspired by color patterns of chameleon skin, is fabricated for detecting diethylstilbestrol (DES). The chip features a regularly structured, non-closed-packed (NCP) colloidal photonic crystal (CPC) lattice made monodisperse MIP spheres containing fluorescence poly ionic liquid (FPIL) pigments. The FL color originates from FPIL pigments and is further enhanced by the Purcell effect, while the STR color results from the periodic arrangement of the NCP CPC structure. Upon the addition of DES, the molecular imprinting recognition events of the chip induce bicolored responses. These color variations are observable to the naked eye. Based on a self-correction function of colors, the chip showed direct, sensitive (as low as 0.5 ng/mL), rapid (6 min), selective and stable detection of DES. In sample analysis, the results of DES detected by the chip were by which obtained by the HPLC-MS/MS method.
研究领域:
分析化学
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环境科学
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食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
THERMOCHIMICA ACTA
·
2023
·
IF 3.5
Huang Qian,Xia Hongde,Wei Kai
The tangent method, which is an international standard for analysis of critical state of reaction, is a mathematical method and containing no physical connotations of critical characteristics. Critical moments of reactions were analyzed in the present work and their corresponding temperatures were determined using analysis theory of stoichiometric window function method and stoichiometric relation of reaction based on reaction process λ, which is a characteristic parameter of reactions. The method is based on the qualitative and quantitative mass spectrometric analysis of gaseous substance of the reaction process, the molar yield of the material is used as the basis for calculation. The theoretical analysis by stoichiometric window function method is consistent with experimental results.
研究领域:
化学
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物理化学
✓ 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）