Th. 3e cycle--Oenologie--Bordeaux 2, 1995. / Notice réd. d'après la couv.

Thesis (Ph.D.)--University of Melbourne, Dept. of Agriculture and Food Systems, Institute of Land and Food Resources, 2006. / Typescript. Includes bibliographical references (leaves 219-238).

Thesis (Ph. D.)--University of Sydney, 2003. / Title from title screen (viewed Apr. 28, 2008). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the Dept. of Semitic Studies, Faculty of Arts. Degree awarded 2003; thesis submitted 2002. Includes bibliography. Also available in print form.

Texte abrégé de: Thèse--Lettres--Montpellier III, 1987. / Thèse soutenue sous le titre : "Architecture privée au XIXe siècle, les châteaux du vignoble en Bas-Languedoc occidental" Bibliogr. p. 135-153.

Thesis (PhD)--Stellenbosch University, 1983. / ENGLISH ABSTRACT: No abstract available / AFRIKAANSE OPSOMMING: Geen opsomming beskikbaar

Thesis (MSc)--Stellenbosch University, 1982. / ENGLISH ABSTRACT: No abstract available / AFRIKAANSE OPSOMMING: Geen opsommong beskikbaar

Thesis (MSc)--Stellenbosch University, 1982. / ENGLISH ABSTRACT: No abstract available / AFRIKAANSE OPSOMMING: Geen opsomming beskikbaar

Thesis (MSc)--Stellenbosch University. / VOORWOORD: Die skrywer wens daarop te wys dat in sover dit die wynstok aangaan, hierdie werk wat Suid-Afrika betref, van 'n aanvoor-geaardheid is. Ook in verband met die wortelverspreidings van bladwisselende vrugtebome is daar, sover bekend, in hierdie land nog geen wetenskaplike werk gepubliseer nie. Direkte leiding in verband met hierdie studie was dus tot 'n groot mate onverkrygbaar. Daar dien ten slotte daarop gewys te word, dat hierdie studie op 'n beperkte hoeveelheid geskikte onderstokke uitgevoer is, en dat wingerde nie vooraf vir die doel aangelê kon word nie. By 'n studie van hierdie aard sou die voltydse samewerking van 'n grondskeikundige ook 'n aanbeveling gewees het.

No description available.

Thesis submitted in fulfilment of the requirements for the degree Master of Technology: Chemistry in the Faculty of Applied Sciences at the Cape Peninsula University of Technology / This study sought to prepare and characterise activated carbons from Vitis vinifera (grape) leaf litter, and assess the efficiency and potential application of the adsorbent for the removal of four phenolic compounds (phenol (P), 2-nitrophenol (2-NP), 4-nitrophenol (4-NP) and 2-chlorophenol (2-CP)) from synthetic and industrial wastewaters. Vitis vinifera (grape) leaf litter (GL) was obtained locally, and washed, dried and pulvirized. Chemically activated carbons were prepared using H3PO4 (GLA) and NaOH (GLB). The adsorbents were characterized with SEM, FTIR, EDX and proximate analysis was also carried out. Phenols were extracted from water samples with SPE and analysed with HPLC. The prepared adsorbents were used in sorption of phenols from simulated phenolic wastewaters for optimization of adsorption. Optimal adsorption conditions were then applied for removal of phenols from wastewater samples collected from influents of treatment plants. Column and desorption studies were also carried out. The surface texture and morphology micrographs (using SEM) of the prepared materials/adsorbents showed that the prepared activated carbons possess improved pore structure, cavities and heterogeneous irregular surfaces capable of providing enhanced adsorption. EDX spectroscopy was used for elemental microanalysis and showed that the major constituent of the adsorbent is carbon. FTIR analysis revealed changes and absorption waveband drifts of surface functional groups after activation and adsorption. The proximate analysis of the prepared precursors demonstrated good quality of the active carbons. They had low moisture content (< 12%) and their inorganic matter content (ash) was less than 9% for the three sorbents. Iodine number value of the adsorbents was 342, 1065, and 571 mg/g for GL, GLA and GLB respectively. Excellent recoveries (92.60 – 102.85%) were obtained for the phenolic compounds (P, 2-NP, 4-NP and 2-CP) using polymeric SPE cartridges. Phosphoric acid activation yielded the most efficient activated carbon material relative to the non-treated biomass and those chemically activated with NaOH. Percentage removal was 92.70%, 99.92%, 99.98% and 99.90% for P, 2-NP, 4-NP and 2-CP respectively using GLA. Optimal pH for adsorption was 8, 4 and 7 for GLA, GLB and GL respectively at an equilibration time of 240 min. The evaluation of adsorption kinetics showed the adsorption process of GLA and GLB followed a pseudo-second order kinetic model while adsorption using GL was best described by intraparticle diffusion model. Adsorption equilibrium data were well fitted with Freundlich isotherm model for all three adsorbents. Adsorption capacity of GLA (for removal of phenols) was found to decrease with increase in temperature. In contrast, the sorption efficiency of GL and GLB increased when temperature was increased. Thermodynamic parameters of adsorption (ΔGo, ΔHo & ΔSo) were evaluated. Results revealed favourability and exothermic nature of adsorption of the phenols using GLA. Adsorption processes using GLB and GL were spontaneous and endothermic. Vitis vinifera leaf litter yielded good activated carbons and was effective in remediation of P, 2-NP, 4-NP and 2-CP from contaminated wastewaters.