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      Solid state NMR characterization and adsorption properties of lignocellulose-clinoptilolite composites prepared with siloxanes coupling agents

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          Abstract

          This study reports the preparation of lignocellulose-clinoptilolite composites by means of N-terminated siloxanes as coupling agents, after acid hydrolysis. Reactions were carried out in the presence of dibutyltin dilaurate as catalyst by reacting lignocellulose modified with the coupling agents and clinoptilolite at 140 °C in DMF under nitrogen atmosphere. The light in weight and fluffy composites obtained were characterized by FT-IR, XRD, TGA, SEM and Solid State NMR. Results depicted possible chemical interactions between the two materials (lignocellulose and clinoptilolite). Used as adsorbents, the composites showed to be good candidates for the removal of used motor oil from aqueous solution, with up to 92 mg g-1 of chemical oxygen demand removed.

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          Direct synthesis of amides from alcohols and amines with liberation of H2.

          Chidambaram Gunanathan, Yehoshoa Ben-David, David Milstein (2007)
          Given the widespread importance of amides in biochemical and chemical systems, an efficient synthesis that avoids wasteful use of stoichiometric coupling reagents or corrosive acidic and basic media is highly desirable. We report a reaction in which primary amines are directly acylated by equimolar amounts of alcohols to produce amides and molecular hydrogen (the only products) in high yields and high turnover numbers. This reaction is catalyzed by a ruthenium complex based on a dearomatized PNN-type ligand [where PNN is 2-(di-tert-butylphosphinomethyl)-6-(diethylaminomethyl)pyridine], and no base or acid promoters are required. Use of primary diamines in the reaction leads to bis-amides, whereas with a mixed primary-secondary amine substrate, chemoselective acylation of the primary amine group takes place. The proposed mechanism involves dehydrogenation of hemiaminal intermediates formed by the reaction of an aldehyde intermediate with the amine.
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            Evaluation of nonwoven polypropylene oil sorbents in marine oil-spill recovery.

            Q Wei, R Mather, A Fotheringham … (2003)
            Mechanical recovery of oil by oil sorbents is one of the most important countermeasures in marine oil-spill response. Polypropylene is the ideal material for marine oil-spill recovery due to its low density, low water uptake and excellent physical and chemical resistance. Different forms of polypropylene nonwoven sorbents were evaluated in this study in terms of initial oil-sorption capacities and oil-retention properties. The investigation revealed that the fibre diameter, sorbent porosity and oil property are the most important factors in the oil-sorption performance of polypropylene nonwoven sorbents.
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              Investigation of the effectiveness of absorbent materials in oil spills clean up

              S Stournas, G Anastopoulos, E Lois … (2001)
              Article 0 comments Cited 44 times – based on 0 reviews     Review now
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                Author and article information

                Contributors
                R.M.K. Vala: Role: ND
                L. Tichagwa: Role: ND
                H. Pasch: Role: ND
                E.D. Dikio: Role: ND
                Journal
                Journal ID (publisher): sajc
                Title: South African Journal of Chemistry
                Abbreviated Title: S.Afr.j.chem. (Online)
                Publisher: The South African Chemical Institute (Durban )
                ISSN: 1996-840X
                Publication date (Print): 2015
                Volume: 68
                Issue: 0
                Pages: 143-152
                Affiliations
                [1 ] University of Fort Hare South Africa
                [2 ] Vaal University of Technology South Africa
                [3 ] University of Stellenbosch South Africa
                Article
                Publisher ID: S0379-43502015000100021
                DOI: 10.17159/0379-4350/2015/V68A21
                SO-VID: 2d695a71-4d86-4cb2-8079-6d77dd6baa87
                License:

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO South Africa

                Self URI (journal page): http://www.scielo.org.za/scielo.php?script=sci_serial&pid=0379-4350&lng=en
                Categories
                Subject: Chemistry, Analytical
                Subject: Chemistry, Applied
                Subject: Chemistry, Inorganic & Nuclear
                Subject: Chemistry, Medicinal
                Subject: Chemistry, Multidisciplinary
                Subject: Chemistry, Organic
                Subject: Chemistry, Physical
                Subject: Electrochemistry

                ScienceOpen disciplines: Electrochemistry,Clinical chemistry,Organic & Biomolecular chemistry,Physical chemistry,Analytical chemistry,General chemistry,Industrial chemistry,Inorganic & Bioinorganic chemistry
                Keywords: chemical modification,clinoptilolite,Lignocellulose,solid state NMR,composites,used motor oil
                Data availability:
                ScienceOpen disciplines: Electrochemistry, Clinical chemistry, Organic & Biomolecular chemistry, Physical chemistry, Analytical chemistry, General chemistry, Industrial chemistry, Inorganic & Bioinorganic chemistry
                Keywords: chemical modification, clinoptilolite, Lignocellulose, solid state NMR, composites, used motor oil

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