JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Mengyue Zhu,Zhongyi He,Lei Guo,Renhui Zhang,Valentine Chikaodili Anadebe,Ime Bassey Obot,Xingwen Zheng
In this work, nitrogen-doped carbon dots (NCDs) were obtained by hydrothermal method with citric acid and ethylenediamine as precursors. The corrosion inhibition performance and mechanism of prepared the NCDs on the Q235 carbon steel in 1 M HCl solution were evaluated by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curve, and surface analysis. The results that the NCDs exhibited 93% of inhibition efficiency at 100 mg/L. Electrochemical measurements demonstrated that the NCDs adsorbed on the metal surface and effectively inhibited the electron transfer process. The potentiodynamic polarization suggested that NCDs were excellent mix-type corrosion inhibition. Furthermore, NCDs successfully prevented the dissolution of anode metal and the evolution of cathode hydrogen ions. The adsorption of the NCDs followed Langmuir adsorption isotherm indicated physical and chemical adsorption. At the same time, the adsorption mechanism was analyzed, guiding the use of carbon dots as environment-friendly corrosion inhibitors in the future.
研究领域:
材料科学
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腐蚀与防护
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环境科学
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 11
·3864-3871
·
IF 4.099
Aolei Gao,Zhenhua Sun,Shaopeng Li,Xinjuan Hou,Huiquan Li,Qisheng Wu,Xinguo Xi
Li1.6Mn1.6O4 is a representative ion sieve material that is used to recover lithium from salt brines and bitterns owing to its high lithium ion adsorption capacity reaching 11.9–44 mg g−1. However, manganese dissolution during acid treatment hinders the industrial application of the material. For investigating the mechanism of manganese dissolution, the precursor Li1.6Mn1.6O4 and ion sieve H1.6Mn1.6O4 were prepared and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), chemical content analyses, diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS), and X-ray photoelectron spectroscopy (XPS). The results of XRD, SEM, and FT-IR showed that the bulk phase of Li1.6Mn1.6O4 retained the spinel structure, whereas the lattice diminished during acid treatment. The results of chemical content analyses showed that the bulk phase of Li1.6Mn1.6O4 contained a few trivalent manganese atoms and that the mean valence of manganese in the material increased during acid treatment. DRIFTS and XPS exhibited that the surface of Li1.6Mn1.6O4 was mostly full of tetravalent manganese and retained the spinel structure during acid treatment. In the proposed mechanism of manganese dissolution, an electron of trivalent manganese in the bulk phase transfers to the surface and is captured by tetravalent manganese within the acidic environment. Then, tetravalent manganese is converted to bivalent manganese after acquiring sufficient electrons, and dissolution occurs simultaneously.
研究领域:
材料科学
·
化学工程
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DOI
PubMed
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.8
Yupeng Liu,Zheng Tong,Mengqian Ni,Xibing Ren,Xiangning Bu,Huaizhi Shao,S. Chehreh Chelgani
As a systematic study, this investigation explored the effects of various leaching conditions (hydrochloric (HCl) acid concentration, solid–liquid ratio, temperature, reaction time, and stirring speed on graphite impurity removal rate) to model the ash removal leaching kinetics and evaluated their mechanisms by analytical analyses. The single-factor results indicated that the optimal impurity removal rate (α) was 14.64% at 8 mol/L HCl concentration, 0.1 g/mL solid–liquid ratio, 343 K acid leaching temperature, 120 min reaction time, and 400 rpm stirring speed. Iron-bearing minerals were efferently removed using HCl. The kinetic process analyses indicated that the aphanitic graphite acid leaching process for the ore fitted well with the unreacted shrinkage core model (diffusion reaction). The reaction’s apparent activation energy (Ea) was 23.43 kJ/mol, and the leaching process’s frequency factor (A) was 15.17. The kinetic equation could be considered as (1 − 3(1−α))2/3+2(1−α) = 15.17e–23.43/(RT)t. From the results, it was concluded that the HCl acid leaching process belongs to diffusion control.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2016
·
IF 2.74
Ke Hu,Jia Zhuang,Chaochao Zheng,Zhu Ma,Li Yan,Hubo Gu,Xianguang Zeng,Jiating Ding
A novel environmental-friend corrosion inhibitor named cytosine- l -alanine derivative (CLAD) was synthesized by using small biological molecules to protect the X80 steel surface in HCl solution. The weight loss measurement, polarization curves, electrochemical impedance spectroscopy (EIS) and SEM measurement were used to systematically investigate the inhibition performance of CLAD. The results showed that the corrosion inhibition efficiency of CLAD reached 91%, which was 78% higher than that of l -alanine. And it was found that the impeded electron transfer, reduced metal dissolution and inhibited corrosion progress of metal surface were derived from the compact and uniform protective film. The adsorption of CLAD obeyed the Langmuir adsorption isotherm , and adsorption behaviors included physical adsorption and chemical adsorption. Moreover, the quantum chemistry calculation parameters ( E HOMO , E LUMO and Δ N ) proved that the high corrosion inhibition efficiency of CLAD was associated with its strong adsorption as a barrier film on the steel surface. The results further demonstrated that the KI mixed CLAD was an alternative strategy to enhance the inhibition efficiency and reduce the cost.
研究领域:
材料科学
·
电化学
·
表面工程
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DOI
高影响因子
POSTHARVEST BIOLOGY AND TECHNOLOGY
·
2020
·
IF 4.303
Mingyang He,Zhixing Ge,Min Hong,Qu Hongxia,Xuewu Duan,Yun Ze,Taotao Li,Yueming Jiang
This study investigated the effect of synephrine hydrochloride (Syn-HCl) on litchi pericarp browning and the potential regulating mechanism. Results showed that 0.5 g L −1 Syn-HCl significantly inhibited the development of pericarp browning. Compared to control, Syn-HCl treatment reduced malondialdehyde and H 2 O 2 content and inhibited activities of polyphenol oxidase (PPO) and peroxidase (POD). Meanwhile, Syn-HCl-treated litchi fruit exhibited higher amounts of USFA (unsaturated fatty acids) as well as lower amounts of SFA (saturated fatty acids) through regulating activities of membrane lipids-degrading enzymes: lipase and lipoxygenase. Additionally, higher ratio of USFA to SFA and double bond index were shown in Syn-HCl-treated fruit. Further analysis showed that key genes involved in fatty acid synthesis were also regulated by Syn-HCl treatment. Taken together, these findings indicated that Syn-HCl alleviated litchi pericarp browning resulting from regulation of fatty acid metabolism and maintenance of membrane integrity, which inhibited the enzymatic browning caused by PPO and POD.
研究领域:
植物生理学
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食品科学
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产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2021
·
IF 0
Mansurjon Juraev,Xiao Ya Zhou,Xiao Tao Ma,Cheng Fang,Ye Qian Ge,Qiu Feng Ye,Feng Ye
The structure of basic lanthanum orotate (LaOr) were characterized by elemental analysis and infrared spectroscopy. The thermal stability of polyvinyl chloride (PVC) was further studied by Congo red method, oven discoloration method and thermogravimetric analysis. The results showed that LaOr could prolong the oven discoloration time of PVC, and the color was not completely blackened until 120 min. It has a good synergetic effect with dibenzoyl methane (DBM), and the best effect is achieved when LaOr/DBM ratio is 1.8/1.2. The thermal decomposition kinetics experiment showed that adding DBM can effectively improve the activation energy of PVC/LaOr. The stabilization mechanism of PVC was studied by absorbing HCl method and infrared spectroscopy. The results showed that LaOr could not only replace the unstable chlorine atoms on PVC, but also promote the long-term thermal stability of PVC by absorbing HCl.
研究领域:
材料科学
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化学工程
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DOI
Processes
·
2019
·Vol. 7
·期 3
·159
·
IF 1.963
Yahong Wu,Weiwei Luo,Xunan Jia,Haoqing Fang,Honggang Wang,Shuai Yu
We investigated the performance of viscoelastic surfactant (VES) solution when applied in treatment on the uninvaded matrix using core flooding tests to analyze the impact of VES/CaCl2concentration on fluid viscosity. In this paper, core samples from Tahe carbonate reservoir, with an average permeability less than 0.02 × 10−3μm−2and a small average porosity in the range of approximately 0.04–5.24% are used in the experiments. Computed tomography (CT) scanning is used to provide a detailed description of inner structure variation of cores after the acid system treatment. The results confirmed that a large pressure difference contributed to fracture propagation and the relative permeability of water increased significantly after the treatment. It was also found that higher concentrations of VES and/or Ca2+induced higher viscosity and a stronger fracturing effect, while a lower concentration improved the reaction rates and etching effect, generating small worm holes inside the core. Foam in-situ produced during the etching process is the major contributor to the fluid viscosity enhancement. The permeability of fracture formed on the surface of the core is more sensitive to the confining pressure. These findings can help better understand the rheological properties of the acid system and etching and fracturing mechanisms during acid treatment, and which provides instructions for field implementation.Keywords:VES/HCl solution;carbonate rock;acid etching;X-CT scan;filter loss;core flow experiment
研究领域:
石油工程
·
地质学
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产品关联
DOI
高影响因子
ACS Nano
·
2019
·
IF 13.903
Xifan Chen,Yuanzhi Zhu,Miao Zhang,Jinyi Sui,Wenchao Peng,Yang Li,GuoLiang Zhang,Fengbao Zhang,Xiaobin Fan
MXenes, a family of two-dimensional (2D) transition-metal carbide and nitride materials, are supposed to be promising pseudocapacitive materials because of their high electronic conductivity and hydrophilic surfaces. MXenes, prepared by removing the “A” elements of their corresponding MAX phases by hydrofluoric acid (HF) or LiF–HCl etching, possess abundant terminal groups like −F, −OH, and −O groups. It has been proven that the MXenes with fewer −F terminal groups and more −O groups showed a higher pseudocapacitor performance. In organic reactions, −OH and −X (X = halogen) groups could turn to ether groups in strong nucleophilic reagent. Inspired by that, herein, we report an n-butyllithium-treated method to turn the −F and −OH terminal groups to −O groups on the Ti3C2Tx MXenes. Two types of Ti3C2Tx MXenes prepared by either HF or LiF–HCl etching were systematically investigated, and a comparison with the traditional KOH/NaOH/LiOH-treated method was also carried out. It is found that most of the −F terminal groups on the Ti3C2Tx MXenes can be successfully removed by n-butyllithium, and abundant −O terminal groups were formed. The n-butyllithium-treated Ti3C2Tx MXenes show promising applications in high-performance pseudocapacitors. A record high capacitance of 523 F g–1 at 2 mV s–1 was obtained for the n-butyllithium-treated Ti3C2Tx MXenes, and 96% capacity can remain even after 10 000 cycles.
研究领域:
材料科学
·
电化学
·
能源存储
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产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2019
·
IF 3.78
Xu Wang,Biao Ma,Yating Wang,Songyan Lu,Meng Ma,Yanqin Shi,Si Chen
A totally new theory of “two-step stabilization mechanism” for triazole-based zinc-containing complex (abbreviated as [Zn(ttr)(OAc)]) was proposed through several designed experiments. [Zn(ttr)(OAc)] strongly absorbed HCl at the beginning, and then broke down into 3-amino-1,2,4-triazole which could further stabilized PVC . The structure of [Zn(ttr)(OAc)] was characterized by FTIR spectroscopy , elemental analysis and SEM. Then, Congo red tests and discoloration tests verified [Zn(ttr)(OAc)] could absorb HCl effectively, but PVC showed poor initial whiteness, which further proved above-mentioned stabilization mechanism. Moreover, [Zn(ttr)(OAc)] combined with ZnSt 2 and dibenzoyl methane (DBM) effectively improved the initial color of PVC samples and provided PVC with shorter plasticizing time and longer dynamic thermal stability time than commercial stabilizer 1086F, confirmed by discoloration tests and dynamic thermal stability analysis. We believe [Zn(ttr)(OAc)]/ZnSt 2 /DBM stabilizer system can be used as a commercial stabilizer and the stabilization mechanism of [Zn(ttr)(OAc)] may provide a new way to stabilize PVC.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Mingxin Ren,Jizhou Yang,Zhiyuan Chen,Zhi Wan,Peilin Zuo,Zhenghang Tian,Zhigang Liu,Feng Teng,Peng Hu,Haibo Fan
Tetracycline antibiotic contaminants have attracted more and more attention due to their high toxicity and the difficulty of their natural decomposition. Here, we have successfully regulated the morphologies of Ga2O3 photocatalysts (Ga2O3 QDs, Ga2O3 hollow spheres, and Ga2O3 micrometer rods) through a simple solvothermal and hydrothermal method and investigated their photocatalytic degradation of tetracycline hydrochloride (TC-HCl). It was found that Ga2O3 QDs showed the best photocatalytic performance due to their large specific surface area (61.1838 m2 g–1), wide bandgap (4.62 eV), etc. After the preparation conditions had been optimized, the Ga2O3 QDs synthesized at 240 °C and 10 h exhibited the best performance in degrading TC-HCl; after 500 W xenon lamp irradiation for 20 min, the degradation efficiency can reach 99% and the degradation rate reached 0.2988 min–1. By trapping experiments, the main active substances in the degradation of TC-HCl by Ga2O3 were identified as a superoxide radical (•O2) and a hole (h+). This study provides a new idea of catalyst morphology regulation and a new method for efficient photocatalytic degradation of TC-HCl.
研究领域:
环境化学
·
材料科学
·
光催化
·
纳米技术
·
污染物降解
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产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2012
·Vol. 4
·期 23
·7585-7592
·
IF 5.914
Xianfeng Wang,Jialin Wang,Yang Si,Bin Ding,Jianyong Yu,Gang Sun,Wenjing Luo,Gang Zheng
This work describes the detection of trace hydrogen chloride (HCl) gas through analyses of the resonance frequency signal from quartz crystal microbalance (QCM) sensors coated with polyaniline (PANI) functionalized polyamide 6 (PA 6) (PANI-PA 6) nanofiber-net-binary (NNB) structured membranes. The PA 6 NNB substrate comprising nanofibers and spider-web-like nano-nets fabricated by a versatile electro-spinning/netting (ESN) process offered an ideal interface for the uniform PANI functionalization and enhanced sensing performance. Benefiting from the large specific surface area, high porosity, and strong adhesive force to the QCM electrode of the PANI-PA 6 NNB membranes, the developed HCl-selective sensors exhibited a rapid response, good reproducibility and stability, and low detection limit (7 ppb) at room temperature. Additionally, the PANI-PA 6 NNB sensing membranes presented visible color changes upon cycled exposure to HCl and ammonia, suggesting their potential application in the development of colorimetric sensors. The PANI-PA 6 NNB coated QCM sensors are considered to be a promising candidate for trace HCl gas detection in practical applications.
研究领域:
分析化学
·
传感器技术
·
材料科学
·
环境监测
·
气体传感
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DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 3
·753-761
·
IF 5.726
Peng Kong,Pei Liu,Zhenyu Ge,Hao Tan,Linjuan Pei,Jie Wang,Pengqi Zhu,Xianmo Gu,Zhanfeng Zheng,Zhong Li
HCl-Doped polyaniline (PANI-ES) and PANIs of different oxidation states were prepared by a typical oxidative polymerization and subsequent redox reaction, respectively. The photocatalytic performance of PANIs towards selective benzylamine oxidation reactions under visible light was investigated. PANI-ES containing a polaron structure exhibited the highest light-induced activity (54.9%). The results show that the formation of the surface complex between PANI-ES and adsorbed amine should be responsible for the enhanced visible light activity. The newly formed polaron band in PANI-ES has a greater number of delocalized electrons, which can facilitate electron transfer and thus improve the photoactivity. These results indicate that conjugated conducting polymers can be efficient visible light-responsive nonmetal photocatalysts for green synthesis.
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DOI
高影响因子
危险品化学品经营许可证（带存储）