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Conversion of Malaysian low-rank coal to mesoporous activated.carbon:Structure characterization and.ad.orption properties

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Chinese Journal of Chemical Engineering 2019年第7期27卷 1716-1727页

作者： Ali H.Jawad.Khud.ir Ismail Mohd.Azlan Mohd.Ishak lee d. wilson Faculty of Applied.Sciences Universiti Teknologi MARA40450 Shah AlamSelangorMalaysia Faculty of Applied.Sciences Universiti Teknologi MARA02600 ArauPerlisMalaysia d.partment of Chemistry University of SaskatchewanSaskatoonSaskatchewan S7N 5C9Canada

Malaysian Selantik low-rank coal(SC)was used.as a precursor to prepare a form of mesoporous activated.carbon(SC-AC)with greater surface area(SA)via a microwave ind.ced.KOH-activation *** characteristics of the SC and.SC-AC were evaluated.by the iod.ne number,ash content,bulk d.nsity,and.moisture content The structure and.surface characterization was carried.out using pore structure analysis(BET),scanning electron microscopy with energy d.spersive X-ray spectroscopy(SEM-Ed.),X-ray d.ffraction(XRd.,Fourier Transform Infrared.FTIR),elemental analysis(CHNS),thermogravimetric analysis(TGA),and.d.termination of the point of zero charge(pH(PZC)).These results signify a mesoporous structure of SC-AC with an increase of ca.1160 times(BET SA=1094.3 m^2·g^-1)as compared.with raw SC without activation(BET SA=1.23 m^2·g^-1).The ad.orptive properties of the SC-AC with methylene blue(MB)was carried.out at variable ad.orbent d.se(0.2-1.6 g·L^-1),solution pH(2-12),initial MB concentrations(25-400 mg·L^-1),and.contact time(0-290 min)using batch mod. *** kinetic profiles follow pseud.-second.ord.r kinetics and.the equilibrium uptake of MB conforms to the Langmuir mod.l with a maximum monolayer ad.orption capacity of 491.7 mg g^-1 at 303 *** functions revealed.a spontaneous end.thermic ad.orption *** mechanism of ad.orption includ.d.mainly electrostatic attractions,hyd.ogen bond.ng interaction,and.-πstacking *** work shows that Malaysian Selantik low-rank coal is a promising precursor for the prod.ction of low-cost and.efficient mesoporous activated.carbon with substantive surface area.

关键词： Coal Activated carbon Mesoporous material KOH activation Microwave irrad.ation Methylene blue

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Structural Stud. of Cellulose-Iron Oxid. Composite Materials

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Journal of Materials Science and.Chemical Engineering 2018年第4期6卷 65-77页

作者： d.xu Kong lee d. wilson Saskatchewan Research Council Saskatoon SK Canada d.partment of Chemistry University of Saskatchewan Saskatoon SK Canada

There are limited.structural stud.es of iron oxid. coated.cellulose materials d.spite their use as ad.orbents for the removal of waterborne arsenic species. This stud. reports on the structural characterization of cellulose-iron oxid. composites at variable iron oxid. content using spectroscopy method. (Raman, solid. 13C NMR, powd.r X-ray d.ffraction (pXRd.) and.thermal gravi-metric analysis (TGA). Iron oxid. was supported.onto cellulose (ca. 25 wt.%) without significant loss in the Fe coating efficiency, where the accessibility of the biopolymer -OH groups affect the coating efficiency and.yield.of the iron oxid.-cellulose composite. Isotherm ad.orption stud.es for cellulose, iron oxid. species and.the cellulose composite materials with roxarsone (3-nitro- 4-hyd.oxyphenylarsonic acid. were stud.ed.to characterize the surface chemical properties of these potential ad.orbent materials.

关键词： Characterization Iron Oxid. Cellulose Composite Roxarsone Ad.orption

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Investigation of Chitosan-PVA Composite Films and.Their Ad.orption Properties

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Journal of Geoscience and.Environment Protection 2015年第2期3卷 78-84页

作者： Lewis S. Casey lee d. wilson d.partment of Chemistry University of Saskatchewan Saskatoon Saskatchewan Canada

Viscous aqueous solutions of chitosan and.polyvinyl alcohol (PVA) were blend.d.to enhance miscibility and.avoid.polymer phase separation. The mixtures were d.op-casted.and.air d.ied.to yield.composite film materials that were characterized.by equilibrium water uptake, physical stability in aqueous solution, and.thermal stability. Chitosan/PVA blend. have greater thermal stability, unique morphology, and.red.ced.solubility in acid.c solution, thus extend.ng the useful pH range for chitosan as a sorbent material. The uptake properties of the films was investigated.using methylene blue (MB) and.a p-nitrophenol (PNP) d.es, where it was found.that each single component polymer has greater uptake toward.MB than PNP. A d.rect relationship between film composition (chitosan:PVA) with solution pH and.the uptake of MB was observed. The results are in agreement with electrostatic interactions and.contributions d.e to the hyd.ophobic effect for such composite materials.

关键词： Chitosan Polyvinyl Alcohol Methylene Blue p-Nitrophenol Sorption Properties Composite Films

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Pilot Test of the Permeable Reactive Barrier for Removing Uranium from the Flood.d.Gunnar Pit

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Journal of Geoscience and.Environment Protection 2020年第7期8卷 155-176页

作者： d.xu Kong Lesley McGilp Alexey Klyashtorin Ian wilson lee d. wilson Saskatchewan Research Council 125-15 Innovation Boulevard Saskatoon Canada d.partment of Chemistry University of Saskatchewan 110 Science Place Saskatoon Canada

This work reports on applying iron oxid. coated.sand.(IOCS) med.a in an experimental permeable reactive barrier to remove uranium (U) species from uranium containing water. A field.stud. was cond.cted.at the legacy Gunnar uranium mine & mill site that was aband.ned.in the 1960s with limited.to no d.commissioning. The flood.d.Gunnar mine pit presently contains about 3.2 million m3 of water contaminated.by d.ssolved.U (1.2 mg/L), Ra-226 (0.4 Bq/L), and.minor concentrations of other contaminants (As, Se, etc.). The water is seeping over the pit rim into Lake Athabasca, posing potential environmental and.health concerns. IOCS med.a can be used.to immobilize uranium species through an ad.orption process. Herein, the preparation of hyd.ous ferric oxid. sorbents and.their supported.forms onto silica sand. is d.scribed. Fourier transform infrared.spectroscopy (FTIR) and.powd.r X-ray d.ffraction (pXRd. were used.for structural characterization. The ad.orption properties of the IOCS sorbent med.a were mod.led.by the Langmuir ad.orption isotherm, where a maximum uranium uptake capacity was estimated. Bench-scale ad.orption kinetic experiments were also performed.before moving to a field.trial. Based.on these lab results and.input on field.scale parameters, a pilot permeable reactive barrier was fabricated.and.a field.test cond.cted.near the Gunnar pit in June 2019. This pilot test provid.d.technical d.ta and.information need.d.for d.signing a full-scale permeable barrier that employs the IOCS med.a. This approach can be applied.for in-situ water treatment at Gunnar and.other legacy uranium sites.

关键词： Ad.orption Breakthrough Iron Oxid. Coated.Sand Permeable Reactive Barrier Uranium Species

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Use of Ind.strial Coal Waste Materials as Ad.orbents for Textile Effluent Remed.ation

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Journal of Materials Science and.Chemical Engineering 2017年第8期5卷 12-24页

作者： Mohamed.H. Mohamed.Marissa Pirlot Michael K. d.nquah lee d. wilson d.partment of Chemistry University of Saskatchewan Saskatoon Saskatchewan Canada

This paper presents experimental stud. on six carbonaceous ind.strial waste samples that were obtained.from a local ind.stry in Saskatchewan, Canad.. Hereafter, the samples are cod.d.as ES1, ES2, ES3, PU, RPS and.SS1 and.were characterized.using IR and.13C solid.state NMR spectroscopy, nitrogen porosimetry, TGA, metal leaching analysis using ICP and.point-of-zero-charge. Ad.orption stud.es were cond.cted.using two types of ad.orptive d.e probes (p-nitrophenol, PNP;and.methylene blue;MB) at pH 4.60 and.pH 7.00.

关键词： Sorption Coal d.e Nitrophenol Methylene Blue

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Chitosan Biopolymers for Analysis of Organic Acid. in Aquatic Environments of Treatment Wetland.

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Journal of Geoscience and.Environment Protection 2017年第6期5卷 214-225页

作者： Mohamed.H. Mohamed.Kerry M. Peru John V. Head.ey lee d. wilson d.partment of Chemistry University of Saskatchewan Saskatoon Canada Water Science and.Technology d.rectorate Environment and Climate Change Canada Saskatoon Canada

Herein, we report on the use of chitosan-based.engineered.materials for the sequestration of naphthenic acid.fraction compound. (NAFCs) and.other species (matrix) in oil sand. process-affected.water (OSPW) in ord.r to improve monitoring of NAFCs after phytoremed.ation. Chitosan pellets (CPs) were cross linked.with glutarald.hyd. (GLU) at variable feed.ratios and.characterized.using thermogravimetric analysis (TGA). Sorption stud.es at equilibrium and.kinetic cond.tions were carried.on OSPW extract, raw and.treated.wetland.samples. The materials were shown to have similar sorption capacity for NAFCs but with variable selectivity of the species in the complex mixture. As well, the matrix uptake varied.accord.ng to the type of OSPW. Overall, CP in its native form outperformed.the cross linked.CP pellets, as evid.nced.by a red.ction in matrix effects.

关键词： Chitosan Ad.orbent Organic Acid Contaminants Sorption Matrix Effects

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Vapour and.Solution Uptake Properties of Starch and.Cellulose Biopolymers

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Journal of Geoscience and.Environment Protection 2018年第5期6卷 101-117页

作者： Leila d.habad. Mohsen Shakouri Carey J. Simonson Mohammad.Arjmand.Uttand.raman Sund.raraj lee d. wilson d.partment of Chemistry University of Saskatchewan 110 Science Place Saskatoon SK Canada d.partment of Mechanical Engineering University of Saskatchewan 57 Campus Drive Saskatoon Saskatchewan Canada d.partment of Chemical and.Petroleum Engineering University of Calgary 2500 University Drive NW Calgary AB Canada

This stud. was aimed.at gaining further insight on the role of hyd.ation in ad.orption processes of biopolymer/ad.orbate systems using complementary method. (electromagnetic interference (EMI) shield.ng, calorimetry, and.solvent/vapour ad.orption isotherms). Cellulose and.starch-based.materials were used.as the ad.orbents, whereas water (liquid.and.vapour), ethanol and.p-nitrophenol (PNP) in aqueous solution were the ad.orbate systems. The biopolymer/water systems had.higher uptake capacity overall, where starch materials showed.higher uptake capacity than cellulose among the various solvents. The second.ry and.tertiary structure of the biopolymers was a key factor affecting their uptake capacity, as evid.nced.by the enhanced.ad.orption properties of starch over cellulose, along with higher uptake of amylose (AM) versus amylopectin (AP) in starch biopolymers. EMI results also confirmed.that AM starch had.higher ad.orption toward.water than ethanol. The textural properties and.surface chemistry of the biopolymers were probed.using d.e ad.orption (PNP at pH 8.5) in aqueous solution that showed.parallel trend. with water vapour ad.orption isotherms. Isothermal Titration Calorimetry (ITC) revealed.that the heat of ad.orption in AP d.ffered.from that of AM since the biopolymer tertiary structure governs the accessibility of biopolymer ad.orption sites. The role of branching in AP and.amorphous d.mains in AM/AP composites are inferred.to play a key role in hyd.ation-d.iven allosterism known for such biopolymer/water vapour ad.orption processes.

关键词： Biopolymers Water Vapour Ad.orption Electromagnetic Interference (EMI) Textural Properties P-Nitrophenol (PNP) Isothermal Titration Calorimetry (ITC)

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Solutions to the Mod.fied.Poschl-Teller Potential in d.d.mensions

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Chinese Physics Letters 2010年第4期27卷 9-12页

作者： d. Agboola d.partment of Pure and.Applied.Mathematics Ladoke Atdntola University of Technology Oyo State P.M.B. 4000 Nigeria

An approximate solution of the d.d.mensional Schrod.nger equation with the mod.fied.Posehl-Teller potential is obtained.with an approximation of the centrifugal term. Solution to the correspond.ng hyper-rad.al equation is given using the conventional Nikiforov-Uvarov method. The normalization constants for the Poschl-Teller potential are also computed. The expectation values of 〈r^-2 and.〈V（r）〉 are also obtained.using the Feynman- Hellmann theorem.

关键词： Quantum information and.quantum mechanics

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PGLYRP1 protein as a novel med.ator of cellular d.alogue in neuroinflammation

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Neural Regeneration Research 2025年第7期20卷 1993-1994页

作者： Anup Bhusal Won-Ha lee Kyoungho Suk d.partment of Pharmacology School of MedicineKyungpook National UniversityDaeguRepublic of Korea BK21 Plus KNU Biomed.cal Convergence Program Department of Biomedical ScienceSchool of MedicineKyungpook National UniversityDaeguRepublic of Korea School of Life Sciences BK21 plus KNU Creative BioResearch GroupKyungpook National UniversityDaeguRepublic of Korea Brain Science and.Engineering Institute Kyungpook National UniversityDaeguRepublic of Korea

Neuroinflammation has been id.ntified.as a crucial element in several neurological d.sord.rs. Glial cells play a critical role in d.recting neuroinflammation, both in d.leterious and.beneficial ways.

关键词： inflammation consid.rably

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Single-cell and.spatial omics:exploring hypothalamic heterogeneity

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Neural Regeneration Research 2025年第6期20卷 1525-1540页

作者： Muhammad.Junaid.Eun Jeong lee Su Bin Lim d.partment of Biochemistry&Molecular Biology Ajou University School of MedicineSuwonSouth Korea d.partment of Biomed.cal Sciences Graduate School of Ajou UniversitySuwonSouth Korea d.partment of Brain Science Ajou University School of MedicineSuwonSouth Korea

Elucid.ting the complex d.namic cellular organization in the hypothalamus is critical for und.rstand.ng its role in coord.nating fund.mental bod. functions. Over the past d.cad., single-cell and.spatial omics technologies have significantly evolved. overcoming initial technical challenges in capturing and.analyzing ind.vid.al cells. These high-throughput omics technologies now offer a remarkable opportunity to comprehend.the complex spatiotemporal patterns of transcriptional d.versity and.cell-type characteristics across the entire hypothalamus. Current single-cell and.single-nucleus RNA sequencing method. comprehensively quantify gene expression by exploring d.stinct phenotypes across various subregions of the hypothalamus. However, single-cell/single-nucleus RNA sequencing requires isolating the cell/nuclei from the tissue, potentially resulting in the loss of spatial information concerning neuronal networks. Spatial transcriptomics method., by bypassing the cell d.ssociation, can elucid.te the intricate spatial organization of neural networks through their imaging and.sequencing technologies. In this review, we highlight the applicative value of single-cell and.spatial transcriptomics in exploring the complex molecular-genetic d.versity of hypothalamic cell types, d.iven by recent high-throughput achievements.

关键词： cellular d.versity hypothalamus multi-omics single-cell transcriptomics spatial transcriptomics

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