JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2015
·Vol. 122
·期 3
·1435-1444
·
IF 2.042
Xu Xiaopeng,Chen Si,Shi Yanqin,Wu Bozhen,Ma Meng,Wang Xu
A novel kind of antibacterial thermal stabilizers for transparent poly(vinyl chloride), bis-uracil compounds with different alkyl chain length, was synthesized by the condensation of 6-amino-1,3-dimethyluracil with aliphatic aldehydes and characterized with 1 H NMR spectra. Not only high stabilization efficiency which increased with the increasing of alkyl chain length was obtained to prevent PVC from degradation, special antibacterial properties could also be acquired in the mean time of keeping PVC highly transparent. The results of discoloration test, thermogravimetric analysis, Fourier transform infrared spectra, visible spectroscopy and scanning electron microscopy revealed that the bis-uracil compounds could absorb HCl through acid–base reaction and chemical bonding, and the amine group played a key role in reacting with the inherent structural defects in PVC chains, meanwhile the long alkyl chain of the bis-uracil compounds could reduce their melting points and improve the compatibility with PVC. Comparing with the referential films stabilized by 6-amino-1,3-dimethyluracil and Ca/Zn stabilizers, PVC films stabilized with bis-uracil compounds had excellent transparency. In addition, the measurement of antimicrobial activity suggested that the bis-uracil compounds had the biological activity to inhibit growth of bacteria. We believe that PVC stabilized by such multifunctional stabilizers may widen its applications in biomedical field.
研究领域:
材料科学
·
生物学
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DOI
高影响因子
MINERALS ENGINEERING
·
2025
·
IF 5
Xi Chao,Guannan Li,Hefeng Yuan,Li Cui,Lijuan Wang,Fangqin Cheng
With the continuous growth of global demand for lithium (Li) resources, developing efficient methods for recovering Li from industrial waste is of great significance. Aluminum electrolytic slag (AES) is a hazardous waste produced during the electrolytic aluminum process, containing approximately 1.0–2.7 % lithium, which has a certain value for Li extraction and environmental benefits. This study investigated the Li extraction process via direct HCl leaching with AES as the raw material. Additionally, the changes of phase, microstructure and element distribution of AES before and after leaching were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FT-IR) and other analytical methods. Combined with density functional theory (DFT) calculations, the reaction mechanisms during the leaching process were revealed, elucidating the key reaction steps and influencing factors. By modifying variables like AES particle size, HCl concentration, leaching temperature, and leaching time, the conditions for the Li extraction process were improved. The results show that under the optimal conditions of a particle size below 180 mesh, 6 mol/L HCl, 95 °C, 2 h, and a solid–liquid ratio (S/L) of 1:3 g/mL, the highest Li leaching efficiency reaches 95.22 %. The main phase compositions of the leaching residue are Na 2 SiF 6 , Na 5 Al 3 F 14 , Al 2 O 3 , CaF 2 , and C. This work provides an efficient approach for extracting Li from AES, which is expected to promote the sustainable utilization of Li resources and the high-value utilization of lithium-containing secondary resources.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Zhiwen Chen,Youbin Wang,Qingya Wen,Shunyan Ning,Xinpeng Wang,Yuezhou Wei
Industrial waste solutions are rich in precious metals, which are valuable secondary resources. In order to realize the separation and recovery of ruthenium by electrodeposition, this work used a combination of cyclic voltammetry (CV), chronoamperometry (I-t), and electrochemical quartz crystal microbalance (EQCM) to study the electrochemical behavior and electrodeposition mechanism of ruthenium in HCl solution. The results show that the reduction of ruthenium in HCl solution is influenced by hydrogen evolution reaction (HER) and chlorine evolution reaction, and the reduction process of ruthenium varies at different potentials. The reduction currents of Ru(VIII)/Ru(0) and Ru(IV)/Ru(III) are observed at 0.88 V and 0.6 V. The reduction of Ru(III) to Ru(0) at negative potentials starts at −0.2 V, with peak cathodic currents between −0.2 V and −0.5 V accompanied by a significant mass increase, which is confirmed to be the electrodeposition of metallic ruthenium by SEM and EDS. The microscopic morphology of the ruthenium coating is spherical particles, and the nucleation mode of electrodeposition is progressive nucleation. The HER leads to a macroscopic morphology of a cleaved lamellar structure, which is not tightly adhered to the substrate. The metallic ruthenium starts to oxidize and dissolve rapidly after 1.12 V, leading to a rapid degradation of the electrode surface quality.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
JOURNAL OF CATALYSIS
·
2026
·
IF 6
Jian Shi,Xiao Liang,Qian Zhang,Yaowei Xu,Xiyang Yu,Bing Tang,Donghuai Tu,Hui Ma,Wei Mao,Jianming Yang,Chunran Chang,Jian Lu,Yadong Li
The heterogeneous catalysis of HCl oxidation over Ru-based catalysts is a green and low-carbon chemistry route to recover high-purity Cl 2 from HCl byproduct for industrial practice. Herein, we report a facile fluorination strategy to fabricate durable supported Ru/Ti oxide catalysts for efficient HCl oxidation. The space–time yield by Ru/Ti-hf can reach up to 26.9 g Cl2 ·g cat −1 ·h −1 with an ultrahigh HCl TOF of 1.5 × 10 4 h −1 . After 24-h accelerated deactivation, this catalyst exhibits over 60% higher activity compared to the conventional Ru/Ti-r. This method allows for establishing highly dispersed and sintering-resistant RuO x species. The fluorine incorporation on TiO 2 surface generates abundant oxygen vacancies and Ru active sites, enhancing the activation capabilities for oxygen. Mechanistic calculations further suggest that the Cl-atom recombination step demanding the highest activation energy is facilitated with a lower energy barrier, due to the accumulation of electrons at the 4 d orbital of Ru sites and the transfer of electron to the antibonding orbital of Ru-Cl by moderate fluorine incorporation. These findings provide a nimble approach to fabricating efficient and durable catalysts promising for HCl oxidation in industry.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2021
·
IF 6.165
Xiaoyun Zhang,Meng Zhang,Zhisong Zhang,Qing Li,Renqing Lv,Wei Wu
Three novel bis-Mannich bases (named as M-n-M) have been synthesized by condensation reaction of acetophenone and formaldehyde with different aliphatic diamines (n represents the number of carbon atoms in the diamines). Their corrosion inhibition behaviors for N80 steel in 15% HCl solution were evaluated through weight loss measurements, electrochemical tests, scanning electron microscope (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and contact angle measurements. The results showed that the inhibition efficiency was increased with concentration as well as the alkyl chain length of the inhibitor, with the best inhibitor efficiency obtained as 98.20% for 0.3 % M-8-M in 15% HCl at 90 °C. The electrochemical tests revealed these inhibitors are mixed control type. SEM , AFM, XPS and contact angle measurement results revealed that the inhibitors form a compact adsorption layer on N80 steel surface. Adsorption mechanism of the inhibitors obeys the Langmuir isotherm, and physical adsorption and chemical adsorption exist simultaneously. M-8-M was compared with two commercial inhibitors at elevated temperature and gave a satisfactory corrosion rate of 15.13 mm·y −1 on N80 steel in 15% HCl at 120 °C.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2023
·
IF 8.4
Xiangning Bu,Zheng Tong,Muhammad Bilal,Xibing Ren,Mengqian Ni,Chao Ni,Guangyuan Xie
This study aimed to investigate the effect of ultrasonic power and temperature on the impurity removal rate during conventional and ultrasonic-assisted leaching of aphanitic graphite. The results showed that the ash removal rate increased gradually (∼50 %) with the increase in ultrasonic power and temperature but deteriorated at high power and temperature. The unreacted shrinkage core model was found to fit the experimental results better than other models. The Arrhenius equation was used to calculate the finger front factor and activation energy under different ultrasonic power conditions. The ultrasonic leaching process was significantly influenced by temperature, and the enhancement of the leaching reaction rate constant by ultrasound was mainly reflected in the increase of the pre-exponential factor A. Ultrasound treatment improved the efficiency of impurity mineral removal by destroying the inert layer formed on the graphite surface, promoting particle fragmentation, and generating oxidation radicals. The poor reactivity of hydrochloric acid with quartz and some silicate minerals is a bottleneck limiting the further improvement of impurity removal efficiency in ultrasound-assisted aphanitic graphite. Finally, the study suggests that introducing fluoride salts may be a promising method for deep impurity removal in the ultrasound-assisted hydrochloric acid leaching process of aphanitic graphite.
研究领域:
矿物加工工程
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化学工程
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DOI
PubMed
高影响因子
ENERGY & FUELS
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2022
·
IF 4.654
Hongming Jiang,Chengyang Li,Luyou Chen,Shuchang Yan,Yan Lin,Zengli Zhao,Zhen Huang,Shujia Wang,Hongyu Huang,Haibin Li
Chemical looping (CL) conversion is a fuel heat utilization technology with CO2 capture and pollution control capability. During the treatment of Cl-containing organic solid waste, a large amount of HCl is generated, along with highly toxic polychlorinated dibenzo-p-dioxins and polychlorinated dibenzo-p-furans, thereby resulting in serious equipment corrosion and environmental harm. Red mud (RM) produced by the alumina industry is a potential cheap oxygen carrier (OC) with in situ dechlorination capability. In this paper, three types of RM are selected to study the evolution and varieties of Na- and Ca-containing compounds in the process of OC preparation and dechlorination. The dechlorination mechanisms and performances of the RM OCs under various reaction conditions are discussed. The results verify that the Na- and Na/Ca-rich RM OCs exhibit good dechlorination performances at a high reaction temperature. The RM OC components with dechlorination activity include Na in the form of soluble alkali (e.g., NaOH), Na2Ti3O7, and Na6Al4Si4O17, along with Ca in the form of CaO, Ca2SiO4, and CaTiO3, whereas NaAlSiO4, Na1.15(Al1.15Si0.85O4), and Ca2Al2SiO7 are inert. The dechlorination performances of the RM OCs are inhibited by the presence of water vapor and high temperature. In the dechlorination process using RM OCs, HCl first reacts rapidly with active elements on the surface of the OC with high dechlorination efficiency. With the saturation of surface-active elements, the reaction enters the HCl diffusion control stage, when the appropriate particle size of the OC and the gas residence time are helpful for improving the dechlorination efficiency.
研究领域:
环境科学
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化学工程
·
废物管理
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DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Kegui Zhang,Wenzhong Yang,Xiaoshuang Yin,Yun Chen,Ying Liu,Jinxun Le,Bin Xu
Konjac glucomannan (KGM) was modified with amino acids to synthesize polysaccharide esters (KGMA and KGMH) which were evaluated as corrosion inhibitor for mild steel in 0.5 M HCl solution by weight loss tests, Tafel curves, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The synthetic polymers were found to have the lower water absorbency and the higher water solubility than KGM. Gravimetric measurements showed the maximum efficiencies of KGMA and KGMH for decreasing the corrosion rate of metal at 2000 ppm are up to 89.9% and 92.4%, respectively. Polarization curves indicated polysaccharide esters could retard both hydrogen evolution reaction and metal dissolution reaction and that the inhibitory effect was concentration dependent. Besides, EIS studies demonstrated the corrosion resistance of mild steel in hydrochloric acid was enhanced by polymer additives. The observations on mild steel surface by SEM suggested the metallic substrate obtained good protection against corrosion in inhibitor-containing HCl solution. The adsorptive behavior of polymer molecules including physisorption and chemisorption obeyed Langmuir isotherm and UV–vis spectra revealed the formation of inhibitor-ion complex. The better performance of KGMH on corrosion inhibition was attributed to the easier transfer of π-electron or n -electron, which was confirmed by quantum chemical calculations.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2026
·
IF 6.7
Zewei Liu,Fuhang Huo,Liping Zhang,Yong Liu,Xianglong Li,Lei Zhang,Huarui Zhang,Zixian Pang,Linhua Jiang,Bin Li
A composite material synthesized from HCl-treated red mud and γ-Al 2 O 3 (Al 1 HRM 2 ), was developed to enhance CF 4 decomposition in our previous study. However, its catalytic performance requires improvement, as it suffers from poor stability. In this study, the low-cost and anti-HF-corrosive CaO was utilized to further boost the material's CF 4 decomposition efficiency and stability. Specifically, decomposition efficiency and stability increased by 30% and 2.25 times than that of Al 1 HRM 2 , respectively. At the microscopic level, it was observed that after CaO uniformly distributed across the catalyst surface, it enhanced the Al-O (Al-O-Al) stretching vibration, increased the number of oxygen vacancies, and simultaneously prevented the phase transition from γ to α. Additionally, CaO intensifies the characteristic peaks of strong L-acid sites, enhancing their CF 4 adsorption capacity and strength. Specifically, Al Ⅲ sites facilitate C-F bond cleavage to form AlF 3 , which undergoes fluorine-oxygen exchange with CaO to produce CaF 2 . This process effectively inhibits F + occupation of γ-Al 2 O 3 active sites, thereby promoting CF 4 decomposition. This study utilizes RM as a high-performance material for CF 4 pollution control, achieving the goal of treating waste with waste across the aluminum industry supply chain. It provides a new technological foundation for purifying difficult-to-treat Perfluorocarbons greenhouse gases.
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高影响因子
Journal of Cleaner Production
·
2025
·
IF 10
Yuting Lin,Yuran Li,Qiang Cao,Jianshan Wang,Yanbin Cui,Tingyu Zhu
The activity of carbonyl sulfur (COS) hydrolysis catalyst is inhibited by hydrogen chloride (HCl) and then restricts the application of blast furnace gas purification. The presence of HCl significantly reduces the COS hydrolysis conversion by destroying the Al-O bond and -OH. A novel Na and Ce supported Al-based catalyst (Na-Ce/Al 2 O 3 ) was designed to enhance the activity of COS hydrolysis in an HCl-containing atmosphere. It has been found that the addition of Ce creates oxygen vacancy, with three effects on promoting catalyst activity. The oxidation of hydrogen sulfide (H 2 S) is inhibited due to the occupation of the oxygen vacancy by HCl, reducing the sulfur species deposition. H 2 O can be adsorbed and dissociated on the oxygen vacancy to produce -OH group, improving COS hydrolysis. HCl can be preferentially anchored on the oxygen vacancy based on the adsorption energy, protecting -OH group. The improvement of HCl-resistance is essential for the Na-Ce/Al 2 O 3 hydrolysis catalyst to adapt to the complex atmosphere of blast furnace gas and increase the catalyst lifespan.
研究领域:
催化化学
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环境工程
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材料科学
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工业气体净化
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表面化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Mingjun Cui,Siming Ren,Haichao Zhao,Liping Wang,Qunji Xue
Nitrogen doped carbon dots (NCDs) were synthesized and used for inhibiting the corrosion of Q235 carbon steel in hydrochloric acid (HCl) solution. Inhibition effectiveness in short- and long-term immersion was examined using electrochemical measurements, weight loss and surface analysis. Results revealed the inhibition efficiency was improved significantly after adding NCDs and strongly dependent on the concentration of NCDs. SVET results showed that the sample immersed in HCl solution with NCDs showed lower anodic current density mapping than that in blank HCl solution. According to the data extracted from the Langmuir adsorption, the absorption of NCDs involved both chemisorption and physisorption.
研究领域:
材料科学
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腐蚀与防护
·
电化学
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产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2015
·
IF 4.422
Zhe Zhang,Ningchen Tian,Lingzhi Zhang,Ling Wu
The self-assembled films of methionine and its derivatives were prepared on a 1045 carbon steel (CS) surface. EIS and potentiodynamic measurements showed that these films could effectively protect CS against corrosion in 0.5 M HCl, with a maximal protection efficiency of 95.01% achieved by FMOC films. An XPS study confirmed that methionine and its derivatives could form films by chemical adsorption on CS. The inhibition mechanism was theoretically investigated through the quantum chemical calculation and dynamic simulation.
研究领域:
材料科学
·
电化学
·
量子化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）