Study of the adsorption properties of an almond shell in the elimination of methylene blue in an aquatic

The discharges of many industries are loaded with dyes that pose a major problem for health and the environment. Various techniques and methods (physical, chemical, biological...) were developed for the treatment of the effluents charged in dyes. Adsorption is one of the most suitable techniques for the removal of dyes, and natural wastes are among the most used materials as adsorbents. This work is based on the study of the removal of methylene blue in an aqueous medium, using almond shells as adsorbents. The support used was characterized by X-ray diffraction, Scanning electron microscopy, BET method, and Infrared spectroscopy. The results obtained showed that the adsorption equilibrium is established after 20 minutes. We also evaluated the effect of parameters such as pH effect, mass effect, temperature effect, and particle size effect. The equilibrium adsorption kinetics shows that this support has good retention for methylene blue.  The adsorption isotherm obtained is described by the Freundlich model and this adsorption follows a pseudo-second-order equation. The thermodynamic parameters show that the process is endothermic, spontaneous, and disordered

Preparation and Characterization of Biochars Obtained from Biomasses for Combustible Briquette Applications

Renewable energies have been considered as alternative, clean, available, and ecological sources of energy. The production of biochar from biomass by thermochemical means is considered an efficient method of converting biomass for energy production. In this study, the biochars were produced from the biomasses of peanut shells and sugar cane bagasse at different pyrolysis temperatures (400°C, 450°C, and 500°C). The biomass samples and their produced biochars were characterized using calorific value, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy and energy dispersive X-ray spectrometry (SEM and EDX), compressibility index, and combustion behavior in order to analyze their potential. Experimental results showed that biochar has better fuel qualities compared to raw biomass. We also found that increasing the pyrolysis temperature clearly improved the calorific value, the morphology, the porosity of the biochars as well as the compressibility index of the biochars. The interest of this study was to produce renewable biochar from peanut shell waste and sugar cane bagasse for use as solid fuel