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Browsing by Subject "Kinetics"

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Adsorption of methyl violet from aqueous solution using gum xanthan/Fe3O4 based nanocomposite hydrogel

Author: Mittal, H ; Kumar, V ; Saruchi ; Ray, Suprakas S Date: Aug 2016 This research paper reports the utilization of gum xanthan-grafted-polyacrylic acid and Fe(sub3)O(sub4) magnetic nanoparticles based nanocomposite hydrogel (NCH) for the highly effective adsorption of methyl violet (MV) from aqueous solution. ... Read more
Adsorption of phosphate from municipal effluents using cryptocrystalline magnesite: complementing laboratory results with geochemical modelling

Author: Masindi, Vhahangwele ; Gitari, WM ; Pindihama, KG Date: Nov 2015 The use of low-cost and locally available material in the treatment of wastewater has recently become an issue of interest, and magnesite as a low-cost material has been used for the removal of heavy metals in wastewater and has also shown ... Read more
Binding kinetics of aptamers to gp120 derived from HIV-1 subtype C

Author: Millroy, L ; London, G ; Veale, R ; Weinberg, M ; Khati, M Date: Feb 2011 Aptamers are artificial nucleic acid ligands that can be engineered to bind with high specificity to a macromolecule. Their binding specificity and small size allow for a range of therapeutic applications. One avenue of research is to develop ... Read more
Defluoridation of drinking water using Al3+-modified bentonite clay: Optimization of fluoride adsorption conditions

Author: Vhahangwele, M ; Mugera, GW ; Tholiso, N Date: Nov 2014 Al(sup3+)-bentonite clay (Alum-bent) was prepared by ion exchange of base cations on the matrices of bentonite clay. Intercalation of bentonite clay with Al(sup3+) was performed in batch experiments. Parameters optimized include time, dosage, ... Read more
Dissolution kinetics of corncob in lithium perchlorate solvent system

Author: Mudzanani, Khuthadzo ; Ejekwu, Olayile ; Daramola, MO Date: May 2019 To improve the economical use of lignocellulosic bio-waste (e.g. corn cob), an efficient pre-treatment route is required to make its content accessible to enzymatic hydrolysis to produce bio-products such as biofuels and bio-chemicals. The ... Read more
Effective removal of cationic dyes from aqueous solution using gum ghatti-based biodegradable hydrogel

Author: Mittal, H ; Maity, Arjun ; Ray, SS Date: Aug 2015 Biodegradable hydrogels of gum ghatti (Gg) with a co-polymer mixture of acrylamide (AAm) and methacrylic acid (MAA) (termed as Gg-cl-P(AAm-co-MAA)) were synthesised by microwave-assisted free radical graft co-polymerisation technique. The ... Read more
Enhanced adsorptive degradation of Congo red in aqueous solutions using polyaniline/Fe0 composite nanofibers

Author: Bhaumik, M ; McCrindle, RI ; Maity, Arjun Date: Jan 2015 In this study, a simple approach was described for the fabrication of composite nanofibers (CNFs) of polyaniline/Fe0 (PANI/Fe0) using a template-free method for the reductive degradation and removal of Congo red (CR) from aqueous solutions. ... Read more
Evaluation of the efficacy of halloysite nanotubes in the removal of acidic and basic dyes from aqueous solution

Author: Ngulube, T ; Gumbo, JR ; Masindi, Vhahangwele ; Maity, Arjun Date: Jun 2019 The present work describes the removal of Direct Red 81, Methyl Orange, Methylene Blue and Crystal Violet from aqueous solution using halloysite nanotubes. The clay mineral was physicochemically characterized using various methods. The ... Read more
Exfoliated polypyrrole-organically modified montmorillonite clay nanocomposite as a potential adsorbent for Cr (VI) removal

Author: Setshedi, Katlego Z ; Bhaumik, M ; Songwane, S ; nyango, MS ; Maity, Arjun Date: 2013 Exfoliated polypyrrole-organically modified montmorillonite clay nanocomposite (PPy OMMT NC), was prepared as a potential adsorbent, via in situ polymerization of pyrrole monomer for adsorption of toxic Cr(VI) from aqueous solution. The WAXD ... Read more
Flower-like structures of carbonaceous nanomaterials obtained from biomass for the treatment of copper ion-containing water and their re-use in organic transformations

Author: Arunachellan, IC ; Sypu, VS ; Kera, NH ; Pillay, K ; Maity, Arjun Date: Aug 2021 In the present work, raw waste material obtained from polluting dried tree fibres (raw TF) as a source of natural carbon was used for the removal of contaminating copper ions in water. Through two sequential steps of oxidation, carbonaceous ... Read more
Fluorinated quaternary chitosan derivatives: Synthesis, characterization, antibacterial activity, and killing kinetics

Author: Cele, Zamani ED ; Somboro, AM ; Amoako, DG ; Ndlandla, Lindokuhle F ; Balogun, Mohammed O Date: Nov 2020 Chitosan has become an established platform biopolymer with applications in biomedical engineering, nanomedicine, and the development of new materials with improved solubility, antimicrobial activity, and low toxicity. In this study, a series ... Read more
Growth kinetics of nc-Si:H deposited at 200 °C by hot-wire chemical vapour deposition

Author: Oliphant, CJ ; Arendse, CJ ; Knoesen, D ; Muller, TFG ; Prins, S ; Malgas, GF Date: May 2011 The authors report on the growth kinetics of hydrogenated nanocrystalline silicon, with specific focus on the effects of the deposition time and hydrogen dilution on the nano-structural properties. The growth in the crystallite size, attributed ... Read more
Heterogeneous electron transfer kinetics and electrocatalytic behaviour of mixed self-assembled ferrocenes and SWCNT layers

Author: Nkosi, D ; Pillay, J ; Ozoemena, KI ; Nouneh, K ; Oyama, M Date: Jan 2010 The electron transfer dynamics and electrocatalytic behaviour of ferrocene-terminated self-assembled monolayers (SAMs), co-adsorbed with single-walled carbon nanotubes (SWCNTs) on a gold electrode, have been interrogated for the first time. ... Read more
High efficient removal of chromium (VI) using glycine doped polypyrrole adsorbent from aqueous solution

Author: Ballav, N ; Maity, Arjun ; Mishra, SB Date: Aug 2012 Glycine doped polypyrrole (PPy-gly) adsorbent was prepared via in situ polymerization of pyrrole (Py) monomer in the presence of glycine (gly) for the removal of Cr(VI). Formation of PPy homopolymer and inclusion of gly in the PPy matrix were ... Read more
Influence of magnetic nanoparticles on modified polypyrrole/m-phenylediamine for adsorption of Cr(VI) from aqueous solution

Author: Maponya, TC ; Ramohlola, Kabelo Edmond ; Kera, Nazia H ; Modibane, KD ; Maity, Arjun ; Katata-Seru, LM ; Hato, MP Date: Mar 2020 A novel, modified polypyrrole/m-phenylediamine (PPy–mPD) composite, decorated with magnetite (Fe3O4) nanoparticles, and prepared via an in-situ oxidative polymerisation, was investigated. The PPy–mPD/Fe3O4 nanocomposite was employed for the ... Read more
Kinetics and equilibrium studies for removal of fluoride from underground water using cryptocrystalline magnesite

Author: Masindi, Vhahangwele ; Gitari, WM ; Ngulube, T Date: Sep 2015 In the present study, the defluoridation capabilities and adsorption mechanisms of cryptocrystalline magnesite were evaluated. All experiments were done by batch procedure. Conditions assessed include time, dosage, concentration, pH and the ... Read more
Magnetic arginine-functionalized polypyrrole with improved and selective chromium(VI) ions removal from water

Author: Chigondo, M ; Paumo, HK ; Bhaumik, M ; Pillay, K ; Maity, Arjun Date: Feb 2019 Magnetic arginine-functionalized polypyrrole (Fe3O4@Arg-PPy) nanocomposite was fabricated by in-situ polymerisation of pyrrole (Py) monomer in the presence of arginine and Fe3O4 nanoparticles for toxic chromium(VI) ions removal from simulated ... Read more
Morphology, thermal properties and crystallization kinetics of ternary blends of the polylactide and starch biopolymers and nanoclay: The role of nanoclay hydrophobicity

Author: Wokadala, OC ; Ray, SS ; Bandyopadhyay, J ; Wesley-Smith, J ; Emmambux, NM Date: Aug 2015 Polylactide/butylated-starch/nanoclay (70/25.5/4.5 wt%) composites were prepared by melt blending with nanoclays of varying hydrophobicity. Electron microscopy studies indicated that the interphase boundary interaction was highest in the clay ... Read more
Passive neutralization of acid mine drainage using basic oxygen furnace slag as neutralization material: experimental and modelling

Author: Zvimba, JN ; Siyakatshana, Njabulo ; Mathye, Matlhodi Date: Dec 2015 This study investigated passive neutralization of acid mine drainage using basic oxygen furnace slag as neutralization material over 90 days, with monitoring of parameters quality and assessment of their removal kinetics. The quality was ... Read more
Removal of arsenic from wastewaters by cryptocrystalline magnesite: complimenting experimental results with modelling

Author: Masindi, Vhahangwele ; Mugera Gitari, W Date: Feb 2016 Availability of arsenic in waterbodies has posed devastating impacts to terrestrial and aquatic organisms. As such, prudent and pragmatic technologies need to be developed to troubleshoot and solve the problem of arsenic in aquatic ecosystems. ... Read more

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