ACS Materials Au
·
2023
·
IF 0
Dongdong Li,Ning Zhang,Dandan Gao,Ziyu Zhuang,Dewen Zeng
Lithium aluminum layered double hydroxide chlorides (LADH-Cl) have been widely used for lithium extraction from brine. Elevation of the performances of LADH-Cl sorbents urgently requires knowledge of the composition–structure–property relationship of LADH-Cl in lithium extraction applications, but these are still unclear. Herein, combining the phase equilibrium experiments, advanced solid characterization methods, and theoretical calculations, we constructed a cyclic work diagram of LADH-Cl for lithium capture from aqueous solution, where the reversible (de)hydration and (de)intercalation induced phase evolution of LADH-Cl dominates the apparent lithium “adsorption–desorption” behavior. It is found that the real active ingredient in LADH-Cl type lithium sorbents is a dihydrated LADH-Cl with an Al:Li molar ratio varying from 2 to 3. This reversible process indicates an ultimate reversible lithium (de)intercalation capacity of ∼10 mg of Li per g of LADH-Cl. Excessive lithium deintercalation results in the phase structure collapse of dihydrated LADH-Cl to form gibbsite. When interacting with a concentrated LiCl aqueous solution, gibbsite is easily converted into lithium saturated intercalated LADH-Cl phases. By further hydration with a diluted LiCl aqueous solution, this phase again converts to the active dihydrated LADH-Cl. In the whole cyclic progress, lithium ions thermodynamically favor staying in the Al–OH octahedral cavities, but the (de)intercalation of lithium has kinetic factors deriving from the variation of the Al–OH hydroxyl orientation. The present results provide fundamental knowledge for the rational design and application of LADH-Cl type lithium sorbents.
研究领域:
材料化学
·
环境科学
✓ 已验证
DOI
MINERALOGICAL MAGAZINE
·
2024
·
IF 2.8
Ziyu Wang,Minwang Laipan,Mengyao Yuan,Xueya Wan,Min Zhang,Junkang Guo
Heavy metal being immobilised in the lattice of a mineral is beneficial for its removal, recovery and reuse from wastewater. It is therefore essential to determine how heavy metals can be transferred into minerals controllably. This work developed a potential way for transforming heavy metals (Cu2+, Pb2+, Ni2+, Zn2+ and Cd2+) in wastewater into solids with high efficiency by introducing crystal seeds. The results of this work demonstrate that the addition of hydrotalcite and paratacamite crystal seeds can enhance heavy metal removal, both in simulated and actual acid mine wastewater. The removal rate can be increased by 18–47% and 31.8% for each heavy metal and total heavy metals in the presence of each crystal seed, respectively. Additionally, the recovery products of heavy metals can be changed by crystal seeds. In the systems without crystal seeds, the recovery products are mixtures; but the pure phase can be achieved if crystal seeds are added. For instance, in the Cu2+–Al3+–Cl– system without crystal seeds, the products were mixtures of paratacamite and layered double hydroxides (LDHs). But the products could be altered easily by hydrotalcite or paratacamite seeds. Paratacamite seeds induced Cu2+ to form paratacamite at pH 5.0, but a mixture of LDHs and paratacamite at pH 7.0. In contrast, hydrotalcite seeds induced Cu2+ to form LDHs at both pH 5.0 and 7.0. From the perspective of enthalpies of formation, CuAl-LDH and paratacamite are potential products, but the former is generally more stable, and thus it becomes the dominant product of the reaction systems using crystal seeds. It is believed that the crystal seeds can accelerate the dynamic process of LDH formation. This work suggests a controllable way for heavy metals removal, recovery and reuse.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2024
·
IF 7.4
Chunchao Chen,Xiang Gao,Boyu Yuan,Chao Wang,Juan Qiu,Kangwei Gongsun,Ke Lu,Houyi Ma
A smart means to achieve the harmless treatment of corrosive Cl – have been proposed for protecting brass. In this method, intelligent self-healing nanofilms based on the interlayer anion exchange properties of LDHs in situ grow on brass surfaces. The Cl – ions replace the BTA – loaded between LDHs interlayers to induce self-healing, as the binding energy of Cl – is lower than that of BTA – , obtained from theoretical calculations. The simultaneous application of electrochemistry and digital holography technologies confirmed that the constructed film has high instantaneous corrosion inhibition efficiency (99.9 %), long-lasting corrosion resistance, and self-healing ability (50 days).
研究领域:
材料科学
·
电化学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2010
·
IF 3.083
Zhihong Zhu,Lining Qu,Yaqing Guo,Yan Zeng,Wei Sun,Xintang Huang
In this paper a Ni/Al layered double hydroxide (LDH) was first synthesized and further immobilized on a carbon ionic liquid electrode (CILE), which was prepared by using 1-(3-chlorine-2-hydroxypropyl)-3-methylimidazolium acetate as the modifier. The characteristics of LDH/CILE were investigated by scanning electron microscopy (SEM) and cyclic voltammetry . Under the selected conditions the LDH/CILE showed better electrochemical response towards the detection of dopamine (DA) than the CILE. The parameters of DA electro-oxidation on the LDH/CILE were calculated with the values of the electron transfer coefficient ( α ), the number of electrons transferred ( n ), the apparent heterogeneous electron transfer rate constant ( k s ) and the diffusion coefficient ( D ) as 0.426, 2.25, 1.66 s −1 and 7.06 × 10 −5 cm 2 /s, respectively. This modified electrode can be further used to detect DA content in the real drug samples.
研究领域:
分析化学
·
电化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Chunlin Chen,Guoqing Xiao,Fei Zhong,Jian Zhou,Mingtan Wang,Chunyan Chen,Zhengwei Yang,Rui Zou
A novel tree-like flame retardant was used to enhance the fire resistance of epoxy coatings. Specifically, polydopamine (PDA) was firstly deposited on the surface of carbon nanotubes (CNTs) to endow the surface with abundant active groups and high water dispersibility. Afterwards, zinc hydroxystannate (ZHS) was loaded on the surface of CNT/PDA (CPA) by co-precipitation method. The advantage is that it can fully combine the reinforcement effect of one-dimensional CNTs on the carbon layer, the gas phase flame retardant and the catalytic carbon-forming effect of ZHS, thereby obtaining an efficient nanocomposite fireproof coating. The results showed that the CI of the composite coating was greater than its ΔH* value, suggesting that the introduction of nanomaterials helps the curing process of the epoxy coating. The back-side temperature of the composite coating with 3.0 % of [email protected] hybrids reached the lowest value (169.3 °C). Meanwhile, the [email protected] 3.0 % /EP composite coating exhibited the maximum expansion height (21.1 mm) and expansion rate (16.36) during calcination . The thermal weight loss test displayed that the [email protected] 3.0 % /EP retained the highest amount of carbon residue (30.2 %) due to the catalytic carbon formation of ZHS, which laid the foundation for its high adiabatic properties. In addition, the smoke density rating (36.8 %) of the [email protected] 3.0 % /EP was lower than that of the other samples, indicating its best smoke suppression ability. It can be seen that the composite coating can obtain excellent flame retardant and smoke suppression effects under the lower additive amount of nano-additives, which opens up a new avenue for novel and efficient flame-retardant coatings.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2014
·
IF 2.063
Ran-ran Shan,Liang-guo Yan,Yan-ming Yang,Kun Yang,Shu-jun Yu,Hai-qin Yu,Bao-cun Zhu,Bin Du
The Mg–Al-CO 3 -LDH with Mg 2+ /Al 3+ molar ratio of 2 was prepared via coprecipitation method at constant pH of 9–10 and used to remove three red dyes by batch adsorption method. The results showed the Mg–Al-LDH were well crystallized and can adsorb the red dyes effectively. The optimal adsorbent dosage and contact time were 1.0 g and 60 min, respectively. Adsorbed amount hardly changed when pH < 10. The adsorption kinetics fit the pseudo-second order kinetic models well and isotherms correspond to Langmuir model strictly. All the relevant mechanisms were studied and manifested as anion exchange and also electrostatic attraction for CR.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2016
·
IF 7.354
Wei-You Zhou,Peng Tian,Fu’an Sun,Ming-Yang He,Qun Chen
The development of a highly active and selective catalytic system that is economical, environmentally benign, and easily recoverable is highly desirable. Bifunctional hybrid catalysts originated from metalloporphyrins (MTSPP; M = Co, Fe, and Mn), and hydrotalcite have been synthesized, characterized, and investigated in the aerobic oxidation of alcohols in the presence of isobutyraldehyde. The designed catalysts exhibited excellent activity, broad applicable scope, and good stability in the oxidation. The effect of surface basicity on the catalytic performance has been studied in detail. The research results showed that as well as protecting the metalloporphyrin molecule, the surface basicity of hydrotalcite also contributed to improving the catalytic activity and the selectivity of aldehyde, and a synergistic effect was observed in the catalytic system. A proposed mechanism for the reaction involving the formation of high-valence cobalt–oxo porphyrin intermediate was postulated based on catalytic results and Hammett and H 2 18 O experiments.
研究领域:
催化化学
·
材料科学
·
有机化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 19
·14859
·
IF 5.6
Yan Xiao,Jie Li,Yuan Tan,Xingkun Chen,Fenghua Bai,Wenhao Luo,Yunjie Ding
Catalytic conversion of biomass-derived ethanol into n-butanol through Guerbet coupling reaction has become one of the key reactions in biomass valorization, thus attracting significant attention recently. Herein, a series of supported Cu catalysts derived from Ni-based hydrotalcite (HT) were prepared and performed in the continuous catalytic conversion of ethanol into butanol. Among the prepared catalysts, Cu/NiAlOxshows the best performance in terms of butanol selectivity and catalyst stability, with a sustained ethanol conversion of ~35% and butanol selectivity of 25% in a time-on-stream (TOS) of 110 h at 280 °C. While for the Cu/NiFeOxand Cu/NiCoOx, obvious catalyst deactivation and/or low butanol selectivity were obtained. Extensive characterization studies of the fresh and spent catalysts, i.e., X-ray diffraction (XRD), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Hydrogen temperature-programmed reduction (H2-TPR), reveal that the catalysts’ deactivation is mainly caused by the support deconstruction during catalysis, which is highly dependent on the reducibility. Additionally, an appropriate acid–base property is pivotal for enhancing the product selectivity, which is beneficial for the key process of aldol-condensation to produce butanol.Keywords:Ni-based hydrotalcite;biomass conversion;support effect;selectivity;stability
研究领域:
催化化学
·
生物质能
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 4
·623
·
IF 5.3
Yilin Zhang,Peng Zhang,Jing Xiong,Yuanfeng Li,Yaxiao Ma,Sicheng Zhang,Zhen Zhao,Jian Liu,Yuechang Wei
In this article, the catalysts of hydrotalcite-derived Ni1.5Co0.5AlO nanosheet-supported highly dispersed Pt nanoparticles (Ptn/Ni1.5Co0.5AlO, where n% is the weigh percentage of the Pt element in the catalysts) were elaborately fabricated by the gas-bubble-assisted membrane--reduction method. The specific porous structure formed by the stack of hydrotalcite-derived Ni1.5Co0.5AlO nanosheets can increase the transfer mass efficiency of the reactants (O2, NO, and soot) and the strong Pt–Ni1.5Co0.5AlO interaction can weaken the Ni/Co-O bond for promoting the mobility of lattice oxygen and the formation of surface-oxygen vacancies. The Ptn/Ni1.5Co0.5AlO catalysts exhibited excellent catalytic activity and stability during diesel soot combustion under the loose contact mode between soot particles and catalysts. Among all the catalysts, the Pt2/Ni1.5Co0.5AlO catalyst showed the highest catalytic activities for soot combustion (T50= 350 °C, TOF = 6.63 × 10−3s−1). Based on the characterization results, the catalytic mechanism for soot combustion is proposed: the synergistic effect of Pt and dual Ni/Co cations in the Pt/Ni1.5Co0.5AlO catalysts can promote the vital step of catalyzing NO oxidation to NO2in the NO-assisted soot oxidation mechanism. This insight into the synergistic effect of Pt and dual Ni/Co cations for soot combustion provides new strategies for reducing the amounts of noble metals in high-efficient catalysts.
研究领域:
催化化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2021
·Vol. 11
·期 2
·162
·
IF 4.146
Huayin Li,Yuan Tan,Xingkun Chen,Wenshao Yang,Chuanqi Huang,Jie Li,Yunjie Ding
Methyl methacrylate (MMA) is an important monomer in fine chemicals. The synthesis of MMA by one-step oxidative esterification from methacrolein with methanol over a heterogeneous catalyst with high activity, selectivity and stability is highly desirable. Herein, Zn-Al-hydrotalcites (HTs)-supported atomically precise Au25nanoclusters with different molar ratios of Zn2+/Al3+were prepared and used as the precursors for this reaction. They exhibited good performances in comparison with the gold catalysts prepared by the deposition precipitation method. The structural and electronic properties were evaluated by various characterization technologies, including X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), in situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) of CO adsorption, X-ray photoelectron spectroscopy (XPS), and CO2temperature-programmed desorption (TPD). The combined characterization results suggested that the adsorption property of gold and the basicity of the catalyst contributes to their high activities. Substrates extended experiments and stability tests implied the potential application of Zn-Al-mixed oxides supported gold catalysts, which paves a new way for supported gold catalyst in the one-step oxidation esterification reaction.Keywords:gold cluster;hydrotalcite;methacrolein;methyl methacrylate;oxidative esterification
研究领域:
化学工程
·
催化化学
✓ 已验证
DOI
高影响因子
RARE METALS
·
2024
·
IF 9.6
Li Jia-Hong,Chen Hao,You Si-Hang,Yang Gan-Xin,Liu Peng,Gao Meng-Qi,Chen Shu-Guang,Zhang Fei-Fei
Owing to the significant potential of alkaline seawater electrolysis for converting surplus power into eco-friendly hydrogen fuel, we developed bifunctional electrodes that integrate low-crystalline NiFe LDHs and amorphous NiFe alloy on a Ni foam (NF) substrate to enhance this process. Driven by the battery-like characteristics of NiFe LDHs, an anti-corrosive and active outer layer of NiFe vac OOH continuously forms over time in the hybrid on the anode for the oxygen evolution reaction (OER), effectively mitigating powder shedding caused by corrosion induced by multiple anions in seawater. Meanwhile, the strong bond between the hybrid and the NF substrate maintains intact hybrid coatings to ensure a relatively high overall conductivity of the electrodes, significantly reducing the negative effects of structural degradation during the OER and hydrogen evolution reaction (HER), as well as the accumulation of contaminants on the electrode surfaces. In long-term tests, these bifunctional hybrid electrodes maintained stable performance, even at a high current density of 500 mA·cm −2 . The cell voltage increased by only 88 mV over 1000 h to 1.970 V during saline electrolysis and by 103 mV over 500 h to 2.062 V during seawater electrolysis. Hence, this study provides valuable insights into efficient and stable seawater electrolysis using NiFe LDHs–NiFe alloy hybrids. Graphical abstract
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2021
·
IF 5.876
Chao Yu,Zhanfang Cao,Shuang Chen,Shuai Wang,Hong Zhong,Xin Ma
For many advanced energy technologies, it is essential to produce non-precious metals, high activity, and low charge transfer resistance electrocatalysts through low cost and simple methods. In this work, MoSe 2 -CoSe 2 @CoAl-LDH composite was synthesized by a one-step hydrothermal method. Compare with the CoAl-LDH catalyst, the prepared MoSe 2 -CoSe 2 @CoAl-LDH composite exhibits an excellent OER performance with a low overpotential (320 mV at 10 mA·cm −2 ), a small Tafel slope (71 mV·dec −1 ). The prominent OER performance of the MoSe 2 -CoSe 2 @CoAl-LDH composite can be mainly attributed to the fast electron transfer from the CoAl-LDH to MoSe 2 -CoSe 2 and the catalytic activity promoted by the energy change of Co 2+ due to the introduction of Se, which can be confirmed by EIS and XPS results, respectively. The strategy of this work may provide a low-cost and facile way for large-scale synthesis of non-precious metal modified hydrotalcite composite.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）