الفهرس 
REMOVAL OF CADMIUM AND ZINC CONTAMINANTS from INDUSTRIAL WASTE WATER BY USING NANO PARTICLES OF MORINGA SEED WASTEOnly 14 pages are availabe for public view
 |  | from | 120 |  |  |
| | | from | 120 | | |
Abstract
Due to the necessity of applying economic, efficient and eco-friendly methods for treatment of industrial wastewater, this study was conducted to: produce a range of novel nano-particle from Moringa oleifera seed waste for clean-up of contaminated industrial wastewater effluents; characterize the chemical, physical and hydro-physical properties of the produced nanosized bio-waste materials; Investigate the optimum operating conditions with regard to nanoscale Moringa oleifera seed waste through the detailed equilibrium and kinetic sorption–desorption studies of Cd and Zn; and evaluate the efficiency and selectivity of nanoparticles of different biosorbentsin removing heavy metals from industrial wastewater in order to lift restrictions on its use for irrigation. To achieve these objectives, series of experiments were conducted, Where,Moringa oleifera seeds were obtained from Ministry of Agriculture and subsequently its seed oil was extracted .The press cake, obtained following oil extraction was oven dried and mechanically ground to diminish the particle size to <100 nm according to the method of Elkhatib et al., (2015).
The characteristics and elemental contents of all ground samples were investigated using SEM, and EDX. The surface structure of nanoparticles derived from moringa seeds waste was explored with FTIR to illustrate the functional groups of the nanoparticle surfaces.The specific surface area of the nanoparticle was determined. All these measurements were carried out by standardized methods that have been routinely used for nanomaterial studies.For composite preparation, 0.25 g of nMSW sample was mixed with 0.25g nanoparticles of drinking water treatment residuals (nWTRs) and suspension was agitated thoroughly. The pollutant (Cd, and Zn) retention capacities of the nanoscale bio-sorbents were determined. A traditional batch equilibration technique (Elkhatib et al., 2013) was used and five initial metal concentrations (5-160 ppm) were utilized. The amounts of metal sorbed by the nanoscale biosorbent were determined as the difference between the concentrations of the supernatant and that of the initial solutions. Sorption data were obtained at different pH and temperatures. At each particular pH and temperature, experimental data were fitted to different mathematical adsorption isotherm models, to determine best fit, and subsequent relevant adsorption parameters including maximum sorption capacity. Effects of pH and temperature on metals retention were evaluated. Key thermodynamic parameters (standard enthalpy change ΔHo, standard entropy change ΔSo, and free energy change ΔGo) were determined based on the methods used by Elkhatib et al., (2013).In addition, the effect of parameters such as, ionic strength, initial metal concentration, adsorbent dosage, and competitive cations on heavy metals removal by the nanoparticles of Moringa oleifera seeds waste was studied.