检索结果-南通市图书馆

Efficient Removal of Phosphate from Aqueous Solutions Using Corundum-hollow-spheres Supported Caclined hydrotalcite Porous Thin Films

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 44-49页

作者：刘云才 ZHU Chen School of Architecture and Materials Engineering Hubei Second Normal UniversityWuhan 430205China

Phosphate was removed from aqueous environment by corundum-hollow-spheres supported caclined hydrotalcite (cHT) thin films. Mg-Al-CO3 hydrotalcite (HT) thin films were deposited on corundumhollow-sphere substrates by hydrothermal homogeneous precipitation at 120℃for 30-240 min and cHT thin films were obtained by annealing of the HT thin films at 500℃for 180 min. Their crystal phase, morphology and microstructure were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).The results show that homogeneous, well-crystallized and hierarchical flower-like thin films were deposited firmly on the surface of the corundum. The mechanism of nucleation and growth of the HT thin films was fitted well with the anion coordination polyhedron growth unit model. To determine the absorption of phosphate by this adsorbent, different bed depth (10-30 cm) and flow rate (1.0-3.0 m L/min) were examined by column experiments. The highest removal efficiency of phosphate amounted to 98.5%under optimum condition (pH=7.2). The adsorption capacity increased as the bed depth increased and decreased as the flow rate increased.

关键词： adsorption phosphate hydrotalcite corundum-hollow-sphere hydrothermal homogeneous precipitation thermal anneal

Graphene oxide/hydrotalcite modified polyethersulfone nanohybrid membrane for the treatment of lead ion from battery industrial effluent

在线全文

学校读者我要写书评

暂无评论

中国化学工程学报:英文版 2023年第8期60卷 253-261页

作者： Sinu Poolachira Sivasubramanian Velmurugan Department of Chemical Engineering National Institute of Technology CalicutCalicut 673601India

In the present study, polyethersulfone based nanohybrid membranes were effectively fabricated by incorporating graphene oxide(GO) and hydrotalcite(HT) nanosheets into the membrane structure. HT was prepared to overcome the irreversible agglomeration behavior of GO at a high concentration which affects the performance of the membranes. In particular, the shedding of HT in formamide provides a two-dimensional nanosheet with a higher positive charge density to prevent the restacking of GO nanosheets. Here, exfoliated GO and HT with different combinations(1:1, 1:2 and 1:3) were infused in the membrane matrix to treat lead-acid battery effluent effectively. Finally, the hybrid membranes were characterized for hydrophilicity, mechanical strength and pure water flux. In combination with the superior properties of GO and HT, the prepared hybrid membranes can be used as effectively to improve the separation and permeation performance. The phase inversion process eliminated the leaching of nanoparticles from the membrane matrix. The reusability of the hybrid membrane was achieved using0.1 mol·L^(-1)NaOH solution and reused without significant reduction in lead removal efficiency. The cost analysis of the membrane was also estimated from the lab study. Therefore, the present study suggested the selective and sustainable treatment of lead from a real-life effluent.

关键词： Nanohybrid membrane Polyethersulfone Graphene oxide hydrotalcite Lead battery effluent Reusability Cost analysis

Enhanced and fast fluoride adsorption using cerium organic frameworks based hydrotalcite hybrid material

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2023年第12期41卷 2010-2017,I0007页

作者： Antonysamy Jeyaseelan Ilango Aswin Kumar MuNaushad Natrayasamy Viswanathan Department of Chemistry Anna UniversityUniversity College of Engineering-DindigulReddiyarchatramDindigul624622TamilnaduIndia Faculty of Civil Engineering Departmentof Landscapeand Water ConservationCzechTechnical University in PragueThakurova 6629Prague6Czch Republic Department of Chemistry College of ScienceKing Saud UniversityP.0.Box 2455Riyadh11451Saudi Arabia

In this present study,hydrotalcite(HT) implanted Ce-BTC metal organic frameworks(MOFs) abbreviated as HT-CeMOFs were developed for rapid fluoride adsorption.The microscopic properties of the prepared HT-CeMOFs material were studied with different characterization techniques.To identify the fluoride adsorption route,the batch experiments such as pH,dosage,adsorption time,interfering anions,initial ion concentration,selectivity,temperature and pHzpcstudies were portrayed towards fluoride removal by HT-CeMOFs.The utmost defluoridation capacity(DC) of HT-CeMOFs is found to be 4662 mg/(F·kg).Fluoride adsorption route onto HT-CeMOFs is followed by Langmuir isotherm and pseudo-second-order with intraparticle diffusion model.Fluoride removal by HT-CeMOFs is spontaneous with endothermic nature.Adsorption mechanism of HT-CeMOFs towards fluoride is followed by electrostatic interaction,ion-exchange and complexation.The regeneration and field exploration of HT-CeMOFs towards fluoride adsorption were performed and their results reveal that the HT-CeMOFs are regenerable and more suitable at field conditions.

关键词： hydrotalcite Metal organic frameworks Cerium Regeneration Defluoridation Rare earths

Recent Advances in the Catalytic Upgrading of Biomass Platform Chemicals Via hydrotalcite-Derived Metal Catalysts

在线全文

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2022年第2期28卷 89-111页

作者： Zhe-Hui Zhang Zhuohua Sun Tong-Qi Yuan Beijing Key Laboratory of Lignocellulosic Chemistry Beijing Forestry UniversityBeijing 100083China

With the world’s fossil fuels being finite in nature,an increasing interest focuses on the application of alternative renewable resources such as biomass.Biomass-derived platform chemicals with abundant functional groups have the potential to replace bulk chemicals for the production of value-added chemicals,fuels,and materials.The upgrading of these platform chemicals relies on the development of efficient catalytic systems.hydrotalcite,with its wide compositional variety,tuneable anion-exchange capacity,and controlled acidity/basicity sites demonstrates great potential in the catalytic upgrading of biomass and the derived platform chemicals.The past decade has witnessed the emergence of research achievements on the development of efficient and robust hydrotalcite-derived metal catalysts and their applications in the upgrading of biomass or the derived platform chemicals.In this review,we aim to summarize the recent advances on the catalytic upgrading of biomass-derived platform chemicals(e.g.,furfural,5-hydroxymethylfurfural,levulinic acid,and glycerol)via hydrotalcitederived metal catalysts.We also observed that the crucial role of using hydrotalcite-derived catalysts relies on their strong metal–support interactions.As a result,a section focusing on the discussion of the metal–support interactions of hydrotalcitederived catalysts was provided.

关键词： hydrotalcite Biomass Catalysis Metal-support interactions

Adsorption removal of thiocyanate from aqueous solution by calcined hydrotalcite

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2006年第1期18卷 23-28页

作者： LI Yu-jiang YANG Min ZHANG Xiao-jin WU Tao CAO Nan WEI Na BI Yan-jun WANG Jing School of Environmental Science and Engineering Shandong University Jinan 250100 China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085China Key Laboratory of Colloid and Interface Science of Education Ministry Shandong University Jinan 250100 China

A hydrotalcite with Mg/AI molar ratio 2 was prepared by co-precipitation method and was characterized by XRD, TG/DTA, Zeta potential and BET surface area. The hydrotalcite was calcined at 500℃, with the dehydration from interlayer, the dehydroxilation from the brucite-like layer and the decomposition of carbonate successively, transformed into the mixed oxide type. The removal of thiocyanate from aqueous solution by using the original hydrotalcite and calcined hydrotalcite （HTC-500） was investigated. The results showed that the thiocyanate adsorption capacity of calcined hydrotalcite was much higher than that of the original form. Calcined hydrotalcite was particularly effective at removing thiocyanate, and that the effective range of pH for the thiocyanate removal are between 5.5-10.0. The experimental data of thiocyanate removal fit nicely with Langmuir isotherm, and the saturated adsorption uptake was 96.2 mg SCN-/g HTC-500. The adsorption of thiocyanate by calcined hydrotalcite follows first-order kinetics. And the intercalation to the structure recovery for calcined hydrotalcite. But the presence of additional anions could affect the adsorption behavior of thiocyanate.

关键词： magnesium aluminum mixed oxide hydrotalcite adsorption thiocyanate

Ethyl thiosemicarbazide intercalated organophilic calcined hydrotalcite as a potential sorbent for the removal of uranium(VI) and thorium(IV) ions from aqueous solutions

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2013年第4期25卷 717-725页

作者： T.S.Anirudhan S.Jalajamony Department of Chemistry University of KeralaKariavattomTrivandrum 695 581India

This work was conducted to determine the practicability of using a new adsorbent 4-ethyl thiosemicarbazide intercalated, organophilic calcined hydrotalcite （ETSC-OHTC） for the removal of uranium （U（Ⅵ））, and thorium （Th（Ⅳ）） from water and wastewater. The FTIR analysis helped in realizing the involvement of nitrogen and sulphur atoms of ETSC in binding the metal ions through complex formation. Parameters like adsorbent dosage, solution pH, initial metal ions concentration, contact time and ionic strength, that influence adsorption phenomenon, were studied. The optimum pH for maximum adsorption of U（VI） and Th（IV） was found to be in the range 4.0-6.0. The contact time required for reaching equilibrium was 4 hr. The pseudo second-order kinetic model was the best fit to represent the kinetic data. Analysis of the equilibrium adsorption data using Langmuir, Freundlich and Sips models showed that the Freundlich model was well suited to describe the metal ions adsorption. The KF values were 25.43 and 29.11 mg/g for U（Ⅵ） and Th（Ⅳ）, respectively, at 30℃. The adsorbent can be regenerated effectively from U（Ⅵ） and Th（Ⅳ） loaded ones using 0.01 mol/L HC1. The new adsorbent was quite stable for many cycles, without much reduction in its adsorption capacity towards the metals.

关键词： hydrotalcite 4-ethyl thiosemicarbazide uranium（Ⅵ） thorium（Ⅳ） adsorption.

Promotional effects of cerium doping and NO_x on the catalytic soot combustion over MnMgAlO hydrotalcite-based mixed oxides

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2014年第2期32卷 176-183页

作者：李倩王晓常伟陈慧张昭良 School of Chemistry and Chemical Engineering Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical MaterialsUniversity of Jinan

A series of MnMgA10 samples with different amounts of Ce doping were facilely prepared using coprecipitation method and their catalytic soot combustion activity was evaluated by temperature programmed oxidation reaction （TPO）. The methods of X-ray diffraction （XRD）, Brumauer-Emmett-Teller （BET）, H2-TPR, NO-TPO and in situ 1R were used to characterize the physio- chemical properties of these samples. Dopant Ce improved the soot combustion performance of MnMgA10 catalyst due to the en- hanced redox ability. Introduction of NOx led to the further increase of catalytic soot oxidation activity on these samples. Over Ce-containing samples, the catalytic activity was slightly decreased as the amount of dopant Ce increased in 02. Diftbrently, in NO＋O2, a certain amount of dopant Ce was much more favorable and excess amount of Ce resulted in a sharp drop of the catalytic soot combustion activity. Both NO： and nitrates were found to have great contributions to the effects of NOx on the soot combustion activity of Ce-doped catalysts. More NO2 was generated as dopant Ce increased. When appropriate amount of Ce was introduced, the as-formed NO2 was stored as bridging bidentate nitrate on Mn-Ce site, which was confirmed to have higher reactivity with soot than nitrite or monodentate nitrate on Mn and/or Ce sites. Overall, Mno.sMg2.sCeo.lAlo.90 was considered as the most potential catalyst for soot combustion.

关键词： hydrotalcite soot combustion NO2 bridging bidentate nitrate monodentate nitrate rare earths

Catalytic depolymerization of calcium lignosulfonate by NiMgFeO_x derived from sub-micron sized NiMgFe hydrotalcite prepared by introducing hydroxyl compounds

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2019年第8期27卷 1933-1938页

作者： Hongjing Han Jinxin Li Haiying Wang Feng Xue Yanguang Chen Yanan Zhang Yizhen Wang Mei Zhang School of Chemistry&Chemical Engineering Northeast Petroleum UniversityDaqing 163318China Heilongjiang Provincial Key Laboratory of Oil&Gas Chemical Technology Daqing 163318China Shandong Sinocera Functional Material Co. LtdDongying 257000China

A new method for regulating the synthesis of Ni Mg Fe hydrotalcites(NMF LDHs) with the addition of hydroxyl compounds was proposed. A series of NMF LDHs were prepared by the above method, and then were calcined to obtain the Ni Mg FeOx(NMFOx) samples. The NMFOxsamples were characterized by XRD,SEM, TG-DTG, XPS and CO2-TPD, respectively. The catalytic performance of NMFOxfor depolymerizing calcium lignosulfonate(CLS) was evaluated by hydrothermal reaction. The results showed that the addition of hydroxyl compounds favored reducing the particle sizes of NMF LDHs. For the depolymerization of CSL, the yield of liquid product increased from 45% to 75.8% with the addition of NMFOx-ethanol(NMFOxET). The liquid products were mainly phenolics, aromatics, ketones and esters. The total selectivity of oxy-containing compounds was over 90.6%, among them, the phenolics were approximately 35.2%. The valence of Ni and Fe, crystalline phase and basicity almost remained unchanged. The NMFOx-ET samples were recycled for the depolymerization of CLS, moreover, the NMFOx-ET samples had high activity and stability after 4 cycles.

关键词： hydrotalcite Calcium lignosulfonate Depolymerization Oxy-containing compounds

Effects of hydrotalcite combined with esomeprazole on gastric ulcer healing quality: A clinical observation study

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2017年第7期23卷 1268-1277页

作者： Rui-Qi Yang Hua Mao Li-Yun Huang Pei-Zhu Su Min Lu Department of Digestive Diseases Zhujiang Hospital of Southern Medical UniversityGuangzhou 510280Guangdong ProvinceChina

AIM To evaluate the effects of hydrotalcite combined with esomeprazole on gastric ulcer healing quality. METHODS Forty-eight patients diagnosed with gastric ulcer between June 2014 and February 2016 were randomly alloc at e d t o t he c ombinat ion t he r apy gr oup or monotherapy group. The former received hydrotalcite combined with esomeprazole, and the latter received esomeprazole alone, for 8 wk. Twenty-four healthy volunteers were recruited and acted as the healthy control group. Endoscopic ulcer healing was observed using white light endoscopy and narrow band imaging magnifying endoscopy. The composition of collagen fibers, amount of collagen deposition, expression of factor Ⅷ and TGF-β1, and hydroxyproline content were analyzed by Masson staining, immunohistochemistry, immunofluorescent imaging and ELISA. RESULTS Following treatment, changes in the gastric microvascular network were statistically different between the combination therapy group and the monotherapy group(P hydrotalcite combined with esomeprazole is superior to esomeprazole alone in improving gastric ulcer healing quality in terms of improving microvascular morphology, degree of structure maturity and function of regenerated mucosa.

关键词： hydrotalcite Esomeprazole 胃的溃疡溃疡愈合的质量