LANGMUIR
·
2021
·
IF 3.882
Ying Wang,Xingyi Zhou,Minhao Yin,Jibin Pu,Ningyi Yuan,Jianning Ding
Both a superhydrophobic structure and layered double hydroxide (LDH) coating were effective to improve the corrosion resistance of alloys. In this study, a superhydrophobic composite coating based on LDHs was constructed on Mg alloy by laser treatment, in situ growth of Mg-Al LDHs, and modification with octadecyl-trimethoxy-silane (OTS). The so-obtained composite coating was coded as L-LDHs-OTS, where L stands for laser treatment. Results showed that the L-LDHs-OTS composite coating presented the best anti-corrosion performance and the corrosion current density was reduced by about 5 orders of magnitude compared with that of the Mg alloy substrate. The excellent corrosion resistance was related to the superhydrophobicity of the composite coating, the compactness and ion-exchange capacity of the LDH layer, and the dense Si-O-Si network within the OTS layer. Moreover, the L-LDHs-OTS composite coating was still effective after 20 days of immersion tests, showing good long-term corrosion resistance due to the existence of hydrophobicity of the composite coating and the self-healing ability of LDHs.
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高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 48
·15162-15165
·
IF 6.641
Zhi Fang,Bingping Yang,Chunli Hu,Jianggao Mao
A new nonlinear optical material, Ba11[Al(PO4)4](P2O7)(PO4)3, was rationally synthesized via the hybridization of three types of anionic groups, namely [AlO4]5−, [PO4]3− and [P2O7]4−, via a spontaneous nucleation method. Ba11[Al(PO4)4](P2O7)(PO4)3 was characterized with high thermal stability, deep ultraviolet transparency and moderate second-order optical nonlinearity, which were favourable for practical applications.
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CORROSION SCIENCE
·
2019
·
IF 6.355
Yanhui Cao,Dajiang Zheng,Jingsong Luo,Fan Zhang,Cheng Wang,Shigang Dong,Yanlong Ma,Zhaoyuan Liang,Changjian Lin
In this work, a novel in-situ grown layered double hydroxide (LDH) film co-intercalated with inhibitors (vanadates) and low surface energy substance (laurates) was immobilized on Al substrates. A long-term monitoring of electrochemical impedance spectra (EIS) of the various samples in 3.5 wt.% NaCl solution demonstrated the synergetic protection of the intercalated two functional species. Meanwhile, the X-ray diffraction (XRD) result of the samples after immersion in NaCl solution for a long time presented the anion-exchange process between vanadates/laurates and chlorides. The synergetic effect of the two species loaded film significantly contributed to the enhanced long-term corrosion protection of aluminum.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
He Xiao,Wenyao Zhang,Qiushi Yao,Liulian Huang,Lihui Chen,Bruno Boury,Zhongwei Chen
Metal organic frameworks (MOFs) are exploited in many applications of materials science and very recently were investigated as precursors or reagents for material synthesis. In a new way different from previous approaches, here we introduce for the first time the synthesis of metal oxide M x O y in the presence of M-free MOF acting partially as a sacrificial template and as a provider of doping metal atom. We demonstrate this approach in the case of ZnO prepared by a simple hydrothermal method in the presence of a Zn-free MOF like MIL-53(Al) or MIL-125(Ti). The resulting ZnO show low content of Al or Ti < 2% and properties are significantly different depending on whether MIL-53(Al) or MIL-125(Ti) are used or if no MOF is present. The nature and presence of MOF has different major effects on the morphology, the specific surface area of as prepared ZnO and also on the oxygen defects in its crystal structure. Corroborating the XPS, UV–vis DRS, PL, EPR and DFT studies evidence the role of such O-defects on band gap narrowing for samples calcined at 400 °C. These exhibit high efficiency in photodegradation of methyl orange (MO) compared to ZnO prepared in MOF-free conditions or previous literatures. The kinetics of MO degradation is different depending on the morphology, the specific surface and oxygen defects. The present data open the door to a new approach of the synthesis of metal oxides and a control of their properties.
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MICROCHIMICA ACTA
·
2014
·Vol. 182
·期 1
·297-306
·
IF 3.719
Liang Wanjun,Liu Zhengqing,Li Dan,Wu Xiaoping,Liu Shaopu,He Youqiu
We describe a novel fluorescent bioprobe for the sensitive and selective detection of double-stranded DNA (dsDNA). It consists of quantum dots (Q-dots) whose fluorescence is quenched (through photoinduced electron transfer) on covering them with the Al(III)-pefloxacin complex. It is found, however, that dsDNA has an affinity for this complex that is so strong that it can break up the binding to the quantum dots, this leading to a complete recovery of the fluorescence of both the Q-dots and the Al(III)-pefloxacin complex. Dual fluorescence (peaking at 420 and 547 nm) is observed under a single excitation wavelength of 350 nm. Neither ribonucleic acid, bovine serum albumin, nor biologically relevant metal ions are capable of giving this effect. The detection limit (3σ/k) for herring sperm DNA is 15.3 μg L −1 if determined via the fluorescence of the Q-dots, and 48 μg L −1 via the Al(III)-pefloxacin complex. The method was applied to the determination of hsDNA in synthetic samples and gave excellent results.
Al 3+ -pefloxacin mesylate (QDs-Al 3+ -PFLX) complex acts as an excellent quencher of the fluorescence of QDs, which was attributed to the photoinduced electron transfer from QDs to Al 3+ -PFLX complex. Due to the strong and specific binding of double-stranded DNA with Al 3+ -PFLX complex, the fluorescence intensity of QDs-Al 3+ -PFLX dyads system is restored
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 35
·21780-21789
·
IF 3.108
Fuchen Zhang,Qiuxia Wang,Lipeng Wang,Yongping Bai
Herein, poly(ethylene terephthalate-co-isophthalate) (PETI) was synthesized via an ethylene glycol stibium/γ-AlOOH composite catalyst and a study was carried out on the structural changes of the end groups of poly(ethylene terephthalate-co-isophthalate) (PETI). Based on this study, the effect of the structural changes of these end groups on the crystallization and optical properties of polyester has been discussed. Moreover, it was found that after the catalytic reaction, the γ-AlOOH and the carboxyl end groups of PETI generated terminal carboxyl aluminum coordination compounds. The composite catalyst generated alkoxy aluminum and alkoxy stibium. The strong nucleating ability of these new end group structures changed the crystallization properties of the polyester. Moreover, the optical properties of the polyester were affected and as a result, a 90.46% transmittance for PETI was observed.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Jie Xu,Weiying Xu,Dongsheng Wang,Guoqing Sang,Xiaoshuai Yang
The removals of humic acid (HA) and a kind of antibiotic compound by enhanced coagulation (EC) employing various Al-based coagulants with, and without MIEX resin pre-treatment were systematically investigated in this study. A range of techniques were used to evaluate the purification behaviors and mechanisms of the coagulation and MIEX adsorption processes . The experimental results indicated that sufficient dose of Al-based coagulants removed 60–70% of HA, while traditional Al 2 (SO 4 ) 3 (AS) coagulant with low dose of 1.0–5.0 mg/L coupled with MIEX contributed to a removal rate of 85%. For sole coagulation, Al 13 ([Al 13 O 4 (OH) 24 (H 2 O) 12 ] 7+ ) only removed 11% to <23% of SMX, while AS and polyaluminum chloride (PACl) contributed to comparable removal of about 40%, indicating charge neutralization was not the major mechanism in SMX removal. The SMX removal could be improved to 68–78% by MIEX pre-treatment. Dynamic floc sizes during coagulation processes were studied using a laser diffraction particle sizing device. The results demonstrated Al 13 led to the smallest flocs, while the adsorption and sweep mechanisms in AS and PACl coagulation processes resulted in larger aggregates. Besides, the pretreatment of MIEX could evidently decrease the floc sizes for all the coagulants.
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JOM
·
2016
·Vol. 69
·期 10
·1950-1957
·
IF 1.798
Shi Qihua,Zhang Yimin,Liu Tao,Huang Jing,Liu Hong
To improve separation of V(IV) and Al(III) from aluminum-rich sulfuric acid leaching solution of stone coal, the two-stage separation by crystallization and solvent extraction methods have been developed. A co-extraction coefficient ( k ) was put forward to evaluate comprehensively co-extraction extent in different solutions. In the crystallization stage, 68.2% of aluminum can be removed from the solution. In the solvent extraction stage, vanadium was selectively extracted using di-2-ethylhexyl phosphoric acid/tri-n-butyl phosphate from the crystalline mother solution, followed by H 2 SO 4 stripped efficiently. A V 2 O 5 product with purity of 98.39% and only 0.10% Al was obtained after oxidation, precipitation, and calcination. Compared with vanadium extraction from solution without crystallization, the counter-current extraction stage of vanadium can be decreased from 6 to 3 and co-extraction coefficient ( k ) decreased from 2.51 to 0.58 with two-stage separation. It is suggested that the aluminum removal by crystallization can evidently weaken the influence of aluminum co-extraction on vanadium extraction and improve the selectivity of solvent extraction for vanadium.
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MATERIALS CHARACTERIZATION
·
2016
·
IF 2.383
Zhaobing Cai,Guo Jin,Xiufang Cui,Zhe Liu,Wei Zheng,Yang Li,Liquan Wang
Ni-Cr-Co-Ti-V-Al high-entropy alloy coating on Ti-6Al-4V was synthesized by laser surface alloying. The coating is composed of a B2 matrix and (Co, Ni)Ti 2 compounds with few β-Ti phases. Focused ion beam technique was utilized to prepare TEM sample and TEM observations agree well with XRD and SEM results. The formation of HEA phases is due to high temperature and rapid cooling rate during laser surface alloying. The thermodynamic parameters, ΔH mix , ΔS mix and δ as well as Δχ, should be used to predict the formation of the BCC solid solution, but they are not the strict criteria. Especially when Δχ reaches a high value (≥ 10%), BCC HEA will be partially decomposed, leading to the formation of (Co, Ni)Ti 2 compound phases.
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Nanoscale
·
2017
·Vol. 9
·期 44
·17334-17341
·
IF 7.367
Peng Hou,Tong Yang,Hui Liu,Yuan Fang Li,Cheng Zhi Huang
Functional engineering is a crucial prerequisite for specific and wide applications of optical probes. In this study, we proposed a facile active structure preservation (ASP) method to directly develop new self-functional graphitic carbon dots (g-CDs) through a hydrothermal synthesis route by taking ciprofloxacin hydrochloride, an antibiotic belonging to a group of fluoroquinolone drugs, as an example. To retain the functional structures of the starting materials, the reaction temperature is intentionally controlled below the decomposition temperature of the reactants that hold the functional groups. As a proof of concept, we successfully prepared g-CDs with ciprofloxacin-like structures on its surface, as identified by mass spectrometric (MS) analysis. The as-prepared g-CDs not only exhibit effective antibacterial activity towards the bacteria Staphylococcus aureus (Gram-positive) and Escherichia coli (Gram-negative), but can also optically sense pH in the range from 5.02 to 9.91. Furthermore, the g-CDs can coordinate with aluminum ions to show a chelation-enhanced photoluminescence (CHEP) effect. These results indicate that the ASP method can be promising for engineering CDs with various properties.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Liqin Zhao,Xiaojie Zhang,Keyi Liu,Xin Liu,Yuefa Gong,Hong Peng,Wei Qi
Lithium/aluminum layered double hydroxides (LDH) have been industrially applied to extract lithium from salt-lake brine. Different from traditional granulation methods, chitosan with high hydrophilicity was used as the binder of LDH in this work, and LDH/chitosan composite hydrogel granules (CLDH) with a diameter of about 1–2 mm were successfully prepared. The new granulation method is simple, cost-effective, and does not require the use of organic solvents. The chemical composition and structure of CLDH were characterized by techniques such as FTIR, XRD, FESEM, TEM, TGA, and XPS. In simulated brine with a Mg 2+ /Li + ratio of 102, the maximum saturated adsorption capacity of lithium on CLDH-3 reached 12.5 mg g −1 (pH = 6.5), but it took 24 h to reach adsorption equilibrium. During the three successive cycles for the extraction of Li + from simulated brine by the CLDH-3 column at the flow rate of 1 mL min −1 , the adsorption capacities of Li + on CLDH-3 in the three cycles were 15.4, 15.9 and 12.1 mg g −1 , respectively. Moreover, deionized water (30 °C) was used as the eluent to recover lithium adsorbed on the CLDH-3 column, and the lithium recovery efficiencies reached 50.7 %, 53.6 %, and 62.8 % of the column adsorption capacities over the three cycles, respectively, and the Mg/Li ratios in the eluents were 0.47, 0.71, and 0.50, respectively. Overall, CLDH-3 exhibits good reusability, mechanical strength, structural stability, and selectivity in the process of lithium extraction from simulated salt-lake brine, and has potential industrial application value.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Fanhui Liao,Weibin Liang,Meixian Li,Donghai Xu,Le Yang
Selective hydrogenation of carboxylic acids to alcohols remains a challenge due to the requirement of synergistic multiple active sites for H2 activation, reactant adsorption, and selective C–O bond scission. Here, we construct a series of Co–Al metal–metal oxide (MMO) catalysts via the hydrogen-induced reduction of layered double hydroxide (LDH) precursors with tunable Co/Al ratios. The optimal Co4Al1-MMO catalyst exhibits highly dispersed Co0 nanoparticles alongside abundant oxygen vacancies (Ov-Co). The Co0/Ov-Co dual sites synergistically promote H2 dissociation and carbonyl oxygen C=O bond activation, while moderate lattice oxygen stabilizes the metastable structure. Under mild conditions (180 °C, 2 MPa of H2, 3 h), the catalyst achieves 100% conversion of octanoic acid with 99% alcohol selectivity, outperforming state-of-the-art noble-metal systems. This work provides a general strategy for engineering cooperative metallic/defective sites in nonprecious MMO catalysts for selective hydrogenation reactions.
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