Élimination du carbone organique total (COT) de l’eau de lessive en modifiant des pommes de pin de la famille des Cupressaceae

Abstract

Total organic carbon (TOC) is a concern theoretically linked with all organic compounds. The removal efficiency of organic carbon in the treatment of laundry water was used by biomaterial combined with chemical adsorption and physical separation. The objective of this work was to investigate the potential of a natural and modified pine cone as an alternative low-cost to remove total organic carbon (TOC) from aqueous solution. Testing the adsorbent capabilities of natural pine cones using treatment under different conditions started the methodological steps. Then, the modification of surface area by microwave radiation was performed. Experimental realization was carried out using available activated carbon pine cone powder (ACPP) as alternative adsorbent for characterized and removal of total organic carbon (TOC) from laundry aqueous solutions. Phosphoric acid as an activated factor and microwave as heating source were applied in this research. X-ray diffraction spectrum (XRD), Fourier transform infrared spectrometry (FTIR), nitrogen adsorption–desorption isotherms and Brunauer–Emmett–Teller specific surface area and field emission scanning electron microscopy (SEM) were used to study the surface properties of the ACPP. Using microwave irradiation gives rise to decrease of operation time, savings and homogeneous heating of samples, as opposed to furnace heating. The effects of heat methods, H3PO4 concentration, microwave radiation power, microwave radiation time, temperature, initial TOC concentration, ACPP dosage, primary solution pH and soaking time were experimentally studied by batch method to estimate the adsorption capacity, kinetics and equilibrium. The chemical composition of ACPP before and after the modified form is discussed in relation to the XRD, FTIR, SEM and specific surface area results. The results revealed that the surface and chemical composition of ACPP samples was modified by H3PO4 under microwave radiation. Experimental outcomes displayed that increasing in the adsorption capacity and removal efficiency of TOC took place at basic pH and concentration of 20% of H3PO4. The TOC uptake process followed the pseudo-first-order kinetic and was best represented by the Langmuir isotherm. Thermodynamic studies revealed that TOC adsorption on ACPP was exothermic. The results showed that pine cone has been useful as a low-cost alternative material for the removal of TOC from laundry water.

Date	16 Nov 2020
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Robert Hausler (Supervisor)