List of Titles

Composite polyester membranes with embedded dendrimer hosts and bimetallic Fe/Ni nanoparticles: synthesis, characterisation and application to water treatment

- Malinga, S P, Arotiba, O A, Mapolie, S F, Krause, Rui W M, Diallo, M S, Mamba, Bhekie B

Authors: Malinga, S P , Arotiba, O A , Mapolie, S F , Krause, Rui W M , Diallo, M S , Mamba, Bhekie B
Date: 1968
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/123619 , vital:35465 , https://doi.org/10.1007/s11051-013-1698-y
Description: This study describes the preparation, characterization and evaluation of new composite membranes with embedded dendrimer hosts and Fe/Ni nanoparticles. These new reactive membranes consist of films of cyclodextrin–poly(propyleneimine) dendrimers (β-CD–PPI) that are deposited onto commercial polysulfone microporous supports and crosslinked with trimesoyl chloride (TMC). The membranes were subsequently loaded with Fe/Ni nanoparticles and evaluated as separation/reactive media in aqueous solutions using 2,4,6-trichlorophenol as model pollutant. The morphology and physicochemical properties of the composite membranes were characterised using high-resolution transmission electron microscopy (HR-TEM), atomic force microscopy and measurements of contact angle, water intake, porosity and water permeability. The sorption capacity and catalytic activity of the membranes were evaluated using ion chromatography, atmospheric pressure chemical ionisation-mass spectrometry and UV–Vis spectroscopy (UV–Vis). The sizes of the embedded Fe/Ni nanoparticles in the membranes ranged from 40 to 66 nm as confirmed by HR-TEM. The reaction rates for the dechlorination of 2,4,6-trichlorophenol ranged from 0.00148 to 0.00250 min−1. In all cases, we found that the reaction by-products consisted of chloride ions and mixtures of compounds including phenol (m/z = 93), 2,4-dichlorophenol (m/z = 163) and 4-chlorophenol (m/z = 128). The overall results of this study suggest that β-CD–PPI dendrimers are promising building blocks for the synthesis of composite and reactive membranes for the efficient removal of chlorinated organic pollutants from water.
Full Text:
Date Issued: 1968

Quick View

Pavoclinus myae, a new species of clinid fish (Perciformes Blennoidei) from South Africa, with a note on the identity of P. graminis and P. laurentii, and a key to the known species of Pavoclinus

- Christensen, M S (Makkel Skou), Rhodes University. J.L.B. Smith Institute of Ichthyology

Authors: Christensen, M S (Makkel Skou) , Rhodes University. J.L.B. Smith Institute of Ichthyology
Date: 1978-07
Subjects: Pavoclinus -- Identification , Pavoclinus myae -- Classification , Fishes -- Classification , Fishes -- South Africa -- Classification
Language: English
Type: text , book
Identifier: http://hdl.handle.net/10962/69814 , vital:29584 , Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB)) Periodicals Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB))
Description: Online version of original print edition of the Special Publication of the J.L.B. Smith Institute of Ichthyology; No. 18 , Pavoclinus myae n.sp. is described from seven specimens collected off the eastern Cape Province, South Africa. The combination of a separate and high anterior section of the dorsal fin, a narrow caudal peduncle, vomerine teeth and fin counts separates P. myae from the eight other members of the genus. The validity of Pavoclinus graminis and P. laurentii was examined and confirmed. New distinguishing features were found, as characters previously used to differentiate these two species were unreliable.
Full Text:
Date Issued: 1978-07

Quick View

Showing items 1 - 20 of 173