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biosorptive Removal of Zinc from Aqueous Solution by Algerian <i>Calotropis procera</i>Roots

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Journal of Environmental Protection 2015年第7期6卷 735-743页

作者： bahia Meroufel Mohamed Amine Zenasni André Merlin béatrice george Laboratory of Valorization of Vegetal Resources and Food Security (VRVSA) Bechar University Bechar Algeria Laboratory of Studies and Research on Material Wood (LERMAb) University of Lorraine Nancy France

Potentially toxic trace elements, such as zinc, with high levels in water are very serious problems in many places around the world, sometimes in relation to natural sources and in other cases to anthropogenic ones. Adsorption process is among the most effective techniques for removing of many heavy metal ions from different types of water. In this study, an attempt has been made to investigate the efficiency of Calotropis procera roots (CP) in removing of Zn(II) from aqueous solution by using batch mode technique. During the removal process, the effects of solution pH, Zn concentrations and contact time on adsorption efficiency by CP roots were studied. Experimental equilibrium data were analyzed by the Langmuir and Freundlich isotherm models. The results showed that the best fit was achieved with the Langmuir isotherm equation with maximum adsorption capacity of 9.69 mg/g. The biosorption of Zn(II) was a fast process and followed the pseudo-second-order kinetic.

关键词： Calotropis procera Zn(II) Adsorption Kinetics Adsorption Isotherms

Removal of Zn (II) from Aqueous Solution onto Kaolin by batch Design

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Journal of Water Resource and Protection 2013年第7期5卷 669-680页

作者： bahia Meroufel Omar benali Mohamed benyahia Mohamed Amine Zenasni André Merlin béatrice george Department of Chemistry Faculty of Sciences Djillali Liabes University Sidi Bel Abbes Algeria Department of Chemistry Faculty of Sciences Tahar Moulay University Saida Algeria Laboratory of Studies and Research on Material Wood (LERMAb) University of Lorraine Nancy France Laboratory of Valorisation of Vegetal Resources and Food Security (VRVSA) Bechar University Bechar Algeria

The Algerian kaolin clay was investigated to remove Zn(II) heavy metal ion from aqueous solution. The effect of contact time, initial metal ion concentration, pH and temperature was experimentally studied in batch mode to evaluate the adsorption capacity, kinetic, thermodynamic and equilibrium. The extent of zinc adsorption increased with increasing initial concentration of adsorbat, pH and temperature. The linear Langmuir and Freundlich models were applied to describe equilibrium isotherms and both models fitted well. The monolayer adsorption capacity for Zn(II) ions was 12.23 mg per g of kaolin clay at pH 6.1 and 25°C. Dubinin-Radushkevich (D-R) isotherm model was also applied to the equilibrium data. Thermodynamic parameters showed that the adsorption of Zn(II) onto kaolin clay was spontaneous and endothermic process in nature. Furthermore, the Lagergren-first-order and pseudo-second-order models were used to describe the kinetic data. The experimental data fitted well the pseudo-second-order kinetic. As a result, the kaolin clay may be used for removal of zinc from aqueous media.

关键词： Zn(II) Kaolin Adsorption Isotherm Thermodynamic Kinetic

Adsorption of Cu(II) on maghnite from aqueous solution: Effects of pH, initial concentration, interaction time and temperature

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Natural Science 2012年第11期4卷 856-868页

作者： Mohamed Amine Zenasni Said benfarhi André Merlin Stéphane Molina béatrice george bahia Meroufel Institute of Sciences and Technology Department of Sciences Bechar University Bechar Algeria Istitute of Sciences Department of Chemistry Batna University Batna Algeria Laboratory of Studies and Research on Material Wood (LERMAb) University of Lorraine Nancy France nstitute of Sciences and Technology Department of Sciences Bechar University Bechar Algeria

The adsorption behaviour of Cu2+ onto maghnite was conducted under batch conditions. The effect of time, pH of the dispersion, temperature and initial metal concentration on the adsorption of Cu2+ onto maghnite was investigated. In this study, 94% of Cu(II), was adsorbed on the maghnite clay when the equilibrium was reached at 120 min. The adsorption of Cu2+ was a fast process that followed the pseudo-second-order kinetics. This process could be described by the Langmuir model and gave a maximum Cu2+ adsorption capacity of 21.78 mg/g at 293 K. The thermodynamic parameters such as variation of enthalpy ΔH, variation of entropy ΔS and variation of Gibbs free energy ΔG were calculated from the slope and intercept of lnKd vs. 1/T plots. The adsorption was endothermic reaction. The adsorption process for this natural maghnite is more spontaneous because the values of ΔG are less negative. The results suggested that natural maghnite was suitable as sorbent material for the recovery and adsorption of metal ion from aqueous solutions.

关键词： Adsorption Isotherms Natural Maghnite Heavy Metal Cu(II)

Adsorption of Nickel in Aqueous Solution onto Natural Maghnite

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Materials Sciences and Applications 2013年第2期4卷 153-161页

作者： Mohamed Amine Zenasni Said benfarhi André Merlin Stéphane Molina béatrice george bahia Meroufel Institute of Sciences and Technology Department of Sciences Bechar University Bechar Algeria Institute of Sciences Department of Chemistry Batna University Batna Algeria Laboratory of Studies and Research on Material Wood (LERMAb) University of Lorraine Nancy France Laboratory of Studies and Research on Material Wood (LERMAb) University of Lorraine Nancy France.

Maghnite clay obtained from Tlemcen, Algeria was investigated to remove heavy metal ion from wastewater. Thus, the present study includes the adsorption of Ni(II) in aqueous solution on maghnite clay through the process of adsorption under various conditions (with variable concentration of metal ion, temperature, pH and mixing time). Increasing pH favours the removal of metal ions till they are precipitated as the insoluble hydroxides. The uptake is rapid with maximum adsorption being observed within 10 min for Ni(II). In addition, the results obtained from adsorption isotherm indicated that these data can be better fitted with the Langmuir and Freundlich equations than the Dubinin-Radushke- vich (D-R) equation.

关键词： Natural Maghnite Ni(II) Adsorption

Thermochemical co-conversion of biomass-plastic waste to biochar:a review

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Green Chemical Engineering 2024年第1期5卷 31-49页

作者： Adewale george Adeniyi Kingsley O.Iwuozor Ebuka Chizitere Emenike Oluwaseun J.Ajala Samuel Ogunniyi Kabir b.Muritala Department of Chemical Engineering Faculty of Engineering and TechnologyUniversity of IlorinIlorinP.M.B.1515Nigeria Department of Chemical Engineering Landmark UniversityOmu-AranKwara StateP.M.B.1001Nigeria Department of Pure and Industrial Chemistry Nnamdi Azikiwe UniversityAwkaP.M.B.5025Nigeria Department of Chemistry Federal University of TechnologyBosso CampusMinnaNiger StateP.M.B.65Nigeria

biomass and plastics are two of the most common municipal solid wastes globally that have continuously placed a burden on the *** is therefore important that they are properly *** coconversion offers a valuable opportunity to recycle biomass and plastics simultaneously into biochar,which reduces the time and cost of recycling them individually while producing a material with a wide range of *** study is a review of published literature that discusses the thermochemical co-processing of biomass and plastic wastes into *** was observed that co-pyrolysis and co-hydrothermal carbonization are the most commonly utilized technologies for this *** characteristics of different biomass and plastics that have been thermochemically converted into biochar were *** properties of the resulting biochar are affected by the feedstock composition,pre-treatment and blending ratio,the reactor’s configuration,reaction temperature,and the presence of a *** studies found that treating the feedstocks separately resulted in a lower yield of biochar than processing them *** biochar created by this procedure has been used as a soil additive and as an adsorbent for water *** perspectives and suggestions,such as the necessity for some technical advancement,biochar’s economic benefits,improved government participation,and raised social awareness,were also *** factors have the potential to propel this field of study to great horizons.

关键词： biomass Co-pyrolysis Plastic Thermochemical process Valorization

Flexible ultra-thin super-resolution endoscopy

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Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 171-172页

作者： george S.D.Gordon Department of Electrical and Electronic Engineering University of NottinghamNottingham NG7 2RDUK

In recent years, multimode fiber(MMF) has become an important tool for high-resolution endoscopic imaging in narrow channels(e.g., in the brain via needles or inside blood vessels) due to its high mode density and fine diameter, typically bstacle to widespread deployment in applications is that realistic perturbations, including bending, twisting and changes in temperature, cause unacceptable image degradation.

关键词： fiber resolution typically

Unique Genetic Features of Lean NAFLD: A Review of Mechanisms and Clinical Implications

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Journal of Clinical and Translational Hepatology 2024年第1期12卷 70-78页

作者： Jasmine Tidwell george Y.Wu Department of Medicine University of Connecticut Health CenterFarmingtonCTUSA Division of Gastroenterology-Hepatology University of Connecticut Health CenterFarmingtonCTUSA

Non-alcoholic fatty liver disease(NAFLD)affects 25%of the global *** 20%have a normal body mass index(bMI)and a variant known as lean *** typical NAFLD cases associated with obesity and diabetes,lean NAFLD causes liver disease by mechanisms not related to excess weight or insulin *** disorders are among the major factors in developing lean NAFLD,and genome-wide association studies have identified several genes associated with the *** review aims to increase awareness by describing the genetic markers linked to NAFLD and the defects involved in developing lean NAFLD.

关键词： Lean nonalcoholic fatty liver disease Palatine-like phospholipase domain-containing-3 Transmembrane 6 superfamily member 2 Familial hypobetalipoproteinemia Abetalipoproteinemia

Heritable Chronic Cholestatic Liver Diseases:A Review

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Journal of Clinical and Translational Hepatology 2024年第8期12卷 726-738页

Chronic cholestasis due to heritable causes is usually diagnosedin ***,many cases can present andsurvive into *** time course varies considerablydepending on the underlying *** data usuallyreveal elevated conjugated hyperbilirubinemia,alkalinephosphatase,and gamma-glutamyl *** be asymptomatic;however,when present,the typicalsymptoms are pruritus,jaundice,fatigue,and *** diagnostic methods and management requireddepend on the underlying *** development of genome-wide associated studies has allowed the identificationof specific genetic mutations related to the pathophysiologyof cholestatic liver *** aim of this review was tohighlight the genetics,clinical pathophysiology,presentation,diagnosis,and treatment of heritable etiologies of chroniccholestatic liver disease.

关键词： Chronic cholestasis Cholestatic liver disease Congenital hepatic fibrosis Caroli disease Caroli syndrome Alagille syndrome biliary atresia

Effects of interlayer spacing and applied pressure on the lanthanide transport in MoS2-based two-dimensional channels

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International Journal of Smart and Nano Materials 2024年第3期15卷 579-592页

作者： Qinsi Xiong Chong Liu george C.Schatz Department of Chemistry Northwestern UniversityEvanstonILUSA Pritzker School of Molecular Engineering University of ChicagoChicagoILUSA

Rare-earth elements(REEs)are critical to modern industry but difficult to separate due to their subtle and monotonic changes in physico-chemical ***2-based two-dimensional(2D)materials offer novel opportunities for enhancing REE separation,exhibiting a distinct volcano-shaped transport performance distribution that peaks at Sm3+.However,the specific contributions of thermodynamic and kinetic factors to ion transport within 2D confinement remain *** this study,we conducted a series of non-equilibrium all-atom molecular dynamics(MD)simulations to explore the effects of interlayer spacing and external pressure on the transport of lanthanide ions inÅ-scale acetate functionalized 2D MoS2(MoS2-COOH)*** examined ion entry and permeation rates,water flux,dehydration,and binding *** simulation results reveal that the transport trends of lanthanide ions are jointly driven by the dehydration degree and the relative-binding strengths of ions to water and to the acetate within the 2D ***,the dehydration pattern of lanthanide ions during permeation is closely linked to kinetic ***,this study provides a detailed atomistic understanding of the mechanisms under-lying lanthanide ion transport under *** findings point to the significant potential for tuning confinement and chemical functionalization withinÅ-scale channels for more efficient REE separation.

关键词： MoS_(2) 2D channels Lanthanide ions ion transport nanofluidics