NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 38
·18295-18305
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IF 3.925
Zi Dai,Jilin Zhang,Xiaoya Zhao,Xiaoxun Liu,Yunyun Lei,Guixia Liu
Removal of phosphate from wastewater by adsorption has become one of the effective ways to mitigate the negative effects of eutrophication in water bodies, and efficient adsorbent is the key. In this study, MgAl-LDH@ZIF-8 composites were prepared by in situ growth of zeolite imidazole framework-8 (ZIF-8) on layered double hydroxide (MgAl-LDH) for efficient removal of phosphates in wastewater. Compared with pure ZIF-8 and MgAl-LDH, MgAl-LDH@ZIF-8 has higher phosphate removal efficiency of up to 99%. Its maximum adsorption capacity was 68.53 mg P g−1. The adsorption process conformed to the pseudo-second-order kinetic model and Langmuir isotherm model. The thermodynamic results indicate that the adsorption process is spontaneous and endothermic. The adsorption mechanism is mainly electrostatic attraction, ion exchange, and ligand exchange. The MgAl-LDH@ZIF-8 with the dosage of 2.5 g L−1 can remove 30 mg P L−1 of simulated wastewater containing phosphate and meets the discharge standard of the U.S. Environmental Protection Agency (0.5 mg P L−1). The results show that MgAl-LDH@ZIF-8 is an effective adsorbent for the removal of phosphate from wastewater, with potential for practical applications.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hongli Yang,Huilin Hou,Man Yang,Zhongli Zhu,Hui Fu,Dongdong Zhang,Yong Luo,Weiyou Yang
The selective photoreduction of CO 2 into hydrocarbon fuels, such as CH 4 , is highly desirable for sustainable energy but remains a significant challenge due to slow proton-electron transfer processes and competing intermediates. Herein, a novel NiO/MgAl-LDH (NMA-x, LDH represents layered double hydroxide) step-scheme (S-scheme) heterojunction has been engineered via in-situ anchoring MgAl-LDH nanoplates on metal–organic frameworks (MOFs) derived NiO microrods, which improves the CO 2 adsorption capability and specific surface area of NiO. The steered internal electric field in the p-n heterointerface promotes charge separation and attracts a high electron density center on the catalyst surface to favor CH 4 production. Meanwhile, S-scheme photogenerated charge transfer mechanism is proposed by in-situ X-ray photoelectron spectroscopy (XPS), in-situ diffuse reflectance infrared Fourier transform (DRIFT) spectra and density functional theory (DFT) calculation. In this process, photogenerated electrons are transferred from the conduction band (CB) of MgAl-LDH to the valence band (VB) of NiO, facilitating the CHO* species serve as the critical intermediate for producing CH 4 through desired photocatalytic CO 2 reduction. Using pure water as a proton source, the NMA-2 catalyst achieved a high CH 4 selectivity of 91.2% and a yield of 8.98 μmol∙g −1 ∙h −1 , representing significant potential for practical applications. This catalyst outperformed pristine and revitalized NiO by 4.23 and 2.07 times, respectively.
研究领域:
材料科学
·
催化
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环境化学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Qingxiang Zhou,Man Lei,Jing Li,Kuifu Zhao,Yongli Liu
Mg-Al-layered double hydroxide (Mg-Al-LDH) modified nanoscale zero-valent iron (NZVI) (Fe@MgAl-LDH) was firstly synthesized and characterized by several techniques. The results showed that the layered double hydroxides were coated on the surface of nanoscale zero-valent iron particles. This new material exhibited good adsorption for bisphenol A, 4-octylphenol and 4-nonylphenol from water samples. Based on these, a sensitive method was developed for the extraction and preconcentration of bisphenol A, 4-octylphenol and 4-nonylphenol using magnetic Fe@MgAl-LDH nanoparticles as the solid phase extraction adsorbents prior to high performance liquid chromatography coupled with variable wavelength detection. Under the optimal conditions, linear responses were achieved in the range of 0.5–200 μg L −1 with the correlation coefficients (r) above 0.999. The detection limits of three analytes were in the range of 0.24–0.34 μg L −1 , and precisions were all below 2.5% (n = 6). The proposed method was evaluated with real water samples and the excellent spiked recoveries in the range of 96.0–99.3% were achieved.
研究领域:
环境科学
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分析化学
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产品关联
DOI
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2024
·Vol. 22
·期 1
·1-14
·
IF 10.6
Liu Xueyan,Hu Tingting,Jia Yijiang,Yang Shuqing,Yang Yu,Cui Zhuolin,Wang Tao,Liang Ruizheng,Tan Chaoliang,Wang Yuji
The rapid proliferation of tumors is highly dependent on the nutrition supply of blood vessels. Cutting off the nutrient supply to tumors is an effective strategy for cancer treatment, known as starvation therapy. Although various hydrogel-based biomaterials have been developed for starvation therapy through glucose consumption or intravascular embolization, the limitations of single-mode starvation therapy hinder their therapeutic effects. Herein, we propose a dual-function nutrition deprivation strategy that can block the nutrients delivery through extravascular gelation shrinkage and inhibit neovascularization through angiogenesis inhibitors based on a novel NIR-responsive nanocomposite hydrogel. CuS nanodots-modified MgAl-LDH nanosheets loaded with angiogenesis inhibitor (sorafenib, SOR) are incorporated into the poly(n-isopropylacrylamide) (PNIPAAm) hydrogel by radical polymerization to obtain the composite hydrogel (SOR@LDH-CuS/P). The SOR@LDH-CuS/P hydrogel can deliver hydrophobic SOR with a NIR-responsive release behavior, which could decrease the tumor vascular density and accelerate cancer cells apoptosis. Moreover, the SOR@LDH-CuS/P hydrogel exhibits higher (3.5 times) compressive strength than that of the PNIPAAm, which could squeeze blood vessels through extravascular gelation shrinkage. In vitro and in vivo assays demonstrate that the interruption of nutrient supply by gelation shrinkage and the prevention of angiogenesis by SOR is a promising strategy to inhibit tumor growth for multimode starvation therapy.
研究领域:
生物医学工程
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癌症治疗
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材料科学
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药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Shenghui Liu,Jintuan Zhang,Anette Theliander,Weibin Chen,Junyong Wu,Leixin Wu
Based on the dye/salts separation efficiency and membrane injury caused by serious pollution of dye/salts wastewater, this study constructed a 2D tight ultrafiltration membrane that could both solve the membrane injury problem and improve the dye/salts separation efficiency, the compatibility of good self-healing performance and penetration performance by 2D material magnesium-aluminum Layered double hydroxide (MgAl-LDH). The self-repairing of physical injury was achieved through the swelling effect of AMPS-PAN, this property was proved by permeate flux, the retention performance of salts in dye/salts solution, the comparison of scanning electron microscope (SEM), and the mechanical strength after physical injury. The healing of chemical injury occured through the reaction of C C and polyethersulfone chain breakage, which was confirmed by X-ray photoelectron spectroscopy (XPS), permeate flux, the retention performance of salts in dye/salts solution, and mechanical property. The high separation efficiency of dye/salts was achieved through 2D material MgAl-LDH, which was proved by separation selectivity ɑ. The compatibility of good self-healing performance and penetration performance was obtained by 2D material MgAl-LDH, which was proved by the penetration and self-healing performance. Morever, the membrane illustrated excellent both permeability and dye/sals separation efficiency, just like the permeate flux, the retention performance of sodium sulfate in methyl blue/sodium sulfate solution, the retention performance of Na 2 SO 4 in methyl blue/Na 2 SO 4 solution, the retention rate of methyl blue were 99.1 L/m 2 h, 12.5%, 7.9%, 97.7%, respectively. The results of pollution index and contact angle also proved that the membrane had anti-pollution performance.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 20
·6163-6173
·
IF 6.177
Jin Zhang,Mengting Gao,Ruiyi Wang,Xincheng Li,Pengqi Zhu,Yunwei Wang,Zhanfeng Zheng
Selective hydrogenation of α,β-unsaturated aldehydes under mild conditions is a great challenge in the synthesis of the corresponding alcohols. Herein, we report that a series of oxygen vacancy enriched MgAl-LDH coordinated transition metal hydroxide M(OH)x (M = Ru, Pt, Pd, Ag, Rh, Fe, Co, Ni and Cu) photocatalysts were successfully prepared taking advantage of the “memory effect” of MgAl-LDH. A high yield of α,β-unsaturated alcohols was achieved under visible light irradiation. DFT simulations and DRIFTS results show that oxygen vacancies facilitate the adsorption of –CO groups and hinder the adsorption of –CC groups in cinnamaldehyde, which ensures the high selectivity to cinnamyl alcohol. The highly dispersed and electron-rich transition metal hydroxides facilitated the activation of isopropanol to provide active H species under light irradiation and then enhanced the photocatalytic performance. This study demonstrated oxygen vacancy enriched MgAl-LDH supported transition metal hydroxide M(OH)x photocatalysts for efficient selective hydrogenation under visible light irradiation.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 51
·期 5
·2033-2040
·
IF 4.39
Luofu Min,Jingying Duan,Lu Liu,Sheng Ge,Wen Zhang,Yuxin Wang
Layered double hydroxides (LDHs) can play an important role in various areas, but conventional LDHs synthesis often causes product agglomeration and generates plenty of high-salt wastewater, and requires a time-consuming aging process to reach the desired purity and crystalline state. Herein, we report the synthesis of MgAl-LDH, a representative of these kinds of ionic lamellar inorganic solids, with a novel method involving the reaction of magnesium oxide (MgO) with aluminate ions (Al(OH)4−) in a strongly alkaline environment. The formation of MgAl-LDH follows a mechanism of interfacial dissolution–reprecipitation (IDR), i.e., Mg2+ ions released at the interface of dissolved MgO react immediately with Al(OH)4− ions to reprecipitate as MgAl-LDH. The obtained MgAl-LDH has no impurity phases and shows high crystallinity, high specific surface area, and a narrow particle size distribution. Moreover, MgAl-LDH is intercalated with OH− anions, so it can be directly used as a Brønsted base catalyst and ion exchanger. The novel method requires no time-consuming aging process and is highly scalable. It is also shown that a closed-loop synthesis of MgAl-LDH without waste discharge can be achieved with an appropriate Al source, e.g., Al(OH)3, and a recycled NaOH solution.
研究领域:
材料科学
·
环境科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2025
·
IF 3.9
Minglu Zhu,Yuyin Wang,Minghao Du,Xing Zhang,Haoyu Liu,Zhihua Qiao,Juanjuan Yang,Bo Peng,Lei Nie,Zhenglong Li
The catalytic conversion of bio-ethanol to butanol is a pivotal reaction for producing renewable fuels and chemicals from non-edible biomass. Developing non-noble metal-based catalysts that exhibit high activity and stability is of great importance, yet remains a substantial challenge. Herein, Cu/LDH catalyst (Cu supported on MgAl layered double hydroxide), was synthesized via simple impregnation without further calcination, and demonstrated for the activity enhancement of ethanol-to-butanol reaction with superior conversion/yield than previous reports of LDH-derived materials. The catalytic activity of Cu/LDH-150(Red) catalyst is attributed to the interaction between Cu and LDH, induced by the pre-reduction during synthesis. It has been further revealed that the Cu species provides redox sites for dehydrogenation/hydrogenation reactions, promoting the critical initial reaction step ethanol dehydrogenation to acetaldehyde. And pre-reduction of Cu/LDH catalyst facilitates the reduction of Cu 2+ to Cu 0 /Cu + and promotes the incorporation of Cu into the interlayer of LDH, as evidenced by XPS and mechanistic validation with acetaldehyde feed, responsible for the activity enhancement. Graphical A non-noble Cu/MgAl-LDH catalyst, synthesized via simple impregnation without calcination, efficiently converts bio-ethanol to butanol. Pre-reduction enhances activity by generating Cu 0 /Cu + species and structural integration, providing redox sites for key ethanol dehydrogenation to acetaldehyde. This design offers a high-performance, stable catalyst for renewable fuels.
研究领域:
催化化学
·
可再生能源
·
可持续化学
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材料科学
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生物质转化
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Yue Su,Shihui Qiu,Dongping Yang,Shuan Liu,Haichao Zhao,Liping Wang,Qunji Xue
Layered double hydroxide (LDH) with NO 2 − intercalation was successfully prepared via acidification oscillation and ion exchange. The nano-fillers were incorporated into the resin to prepare anti-corrosion coatings with the thickness of ca. 50 ± 5 μm. The electrochemical and self-repairing properties of the LDH-doped coatings were studied by EIS and LEIS. Results indicated that the addition of LDH loaded with nitrite induced obvious increased in the impedance of coating (from 4.64 × 10 8 Ω cm 2 to 2.14 × 10 10 Ω cm 2 ) and improved the anticorrosion performance of the coating. In addition, the localized corrosion of coatings could be largely inhibited, and the released nitrite ions from LDH interlayers exhibited active anticorrosion functions. When LDH nanosheets were added to the coatings, the lamella structures improved the barrier performances of the coatings. At the same time, the excellent ion exchanges ability of LDH could be used as storage stations for chloride ions, and the release of nitrite ions could play an active anti-corrosion role. Both of them cooperated to synergistically improve the anti-corrosion performance of the coating.
研究领域:
材料科学
·
电化学
·
腐蚀与防护
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产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Xinqi Long,Yinke Wang,Jun Hu,Lixu Wu,Chun Sun,Feipeng Jiao
In this work, 2D MgAl-layered double hydroxide (LDH) nanosheets were prepared by a one-step hydrothermal method with adding H 2 O 2 . The as-prepared products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectroscopy, and N 2 adsorption–desorption techniques. Particularly, with 30%wt H 2 O 2 , MA-4 exhibits the optimal optical properties along with the largest surface area of 63.21 m 3 /g among the fabricated samples. In addition, the photocatalytic activities of MgAl-LDH nanosheets were also tightly related to the concentration of H 2 O 2 that 99.34% tetracycline was degraded by 2D MgAl-LDH(MA-4) within 3 h. A possible photocatalytic mechanism was proposed based on the analysis of energy structure and the result of free radical scavenging experiments. Furthermore, the degradation efficiency of MA-4 still reached 85% in five successive cycles, which showed remarkable reusability and stability. In this study, the 2D MgAl-LDH nanosheets were expected as a promising catalyst for practical water purification and provide new ideas in the field of two-dimensional photocatalysis.
研究领域:
材料科学
·
环境催化
·
纳米材料
·
光催化
·
水净化
✓ 已验证
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2019
·
IF 0
Yunhua Yang,Liang Xiong,Xiaomo Huang,Qingshan Shi,Wei-De Zhang
In this work, we used p-hydroxybenzoic anionic intercalated MgAl-layered double hydroxides (MgAl-(p-BzOH)-LDH) as a filler to modify waterborne polyurethane , and successfully synthesized novel WPU/MgAl-(p-BzOH)-LDH composites. CO 3 2- -type MgAl-LDH was firstly synthesized via hexamethylenetetramine hydrolysis method and then was transferred to p-BzOH-intercalated MgAl-LDH by ion exchange. The nanostructured MgAl-(p-BzOH)-LDH was then grafted by isophorone diisocyanate (IPDI), forming [MgAl-(p-BzOH)-LDH] NCO complex with NCO group on the surface, which promotes its homogeneous dispersion in WPU matrix through chemical bonding. The mechanical properties and water resistance of the composites were improved upon loading the MgAl-(p-BzOH)-LDH in certain levels. Furthermore, the composites can slowly release p-hydroxybenzoic anionic into the surrounding environment, and thus exhibit significant antibacterial activity towards G( _ ) Escherichia coli and G(+) Staphylococcus aureus.
研究领域:
材料科学
·
生物学
✓ 已验证
产品关联
DOI
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Shuoqi Ren,Yuchen Wang,Zijian Han,Qiwei Zhang,Chongwei Cui
A highly efficient absorbent was developed in this study by modifying polydopamine film on Mg–Al layered double hydroxide (PDA/MgAl-LDH) to remove Cr(VI) from wastewater. The characterization results showed that the polydopamine film was successfully coated on the MgAl-LDH surface. The preparation ratio, pH, and adsorbent dosage influencing absorption by PDA/MgAl-LDH were systematically investigated. The absorption capacity of Cr(VI) by PDA/MgAl-LDH was 87 mg/g. The equilibrium adsorption isotherm of PDA/MgAl-LDH was in good agreement with that of the Langmuir model. Therefore, the pseudo-second-order kinetic model is suitable for describing adsorption kinetics. The interaction between PDA and Cr(VI) and Cr(III) was investigated using density generalized function theory (DFT), which demonstrated that the PDA amino group could provide electrons for Cr(VI) reduction. Hydrogen and covalent bonding were dominant during the chemisorption process of PDA absorbing Cr(VI), the nitrogen of 5,6-dihydroxyindole was the primary active site for absorbing Cr(III), and electrostatic attraction was mainly responsible for Cr(III) absorption. Therefore, PDA/MgAl-LDH has the potential to adsorb and remove Cr(VI) from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）