a b s t r a c tAvocado seed activated carbon (ASAC) was synthesized by microwave-heating process using ZnCl 2 as an activating agent. The adsorbent ASAC was characterized using analytical techniques namely N 2 isotherms, Fourier transform infrared spectroscopy, and scanning electron microscopy. The surface area of ASAC was 1,432 m 2 g -1 . The ASAC prepared was used for adsorption of resorcinol and 3-aminophenol from aqueous solutions. Kinetic models namely pseudo-first order, pseudo-second order, and Avrami fractional order and isotherms (Freundlich, Langmuir, and Liu) were applied to the experimental adsorption data. The results demonstrate maximum adsorption capacity for resorcinol (406.9 mg g -1 ) and 3-aminophenol (454.5 mg g -1 ) at 50°C. The thermodynamic analysis of data and the effect of temperature studies revealed that the adsorption processes of resorcinol and 3-aminophenol onto ASAC were temperature dependent. The adsorption processes were exothermic and spontaneous. The avocado carbon displayed excellent adsorption properties for the simulated effluents containing phenolic compounds.

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2015): Avocado seed powder: characterization and its application for crystal violet dye removal from aqueous solutions, Desalination and Water Treatment,This study presents removal of crystal violet (CV) dye from aqueous solutions using solid food waste, avocado kernel seed powder (ASP). ASP was used in the native form for biosorption study. The effects of different experimental conditions such as pH of the solution, initial dye concentration, contact time, and temperature were investigated using batch study. Maximum removal of CV (95.9 mg g −1 ) by ASP (100 mg) was observed at pH 7 and 55˚C. The kinetics data were evaluated using pseudo-first-order, pseudo-second-order, and general-order kinetic adsorption models. The general-order kinetic adsorption model gave the best description of the biosorption kinetic of CV onto ASP biosorbent. Similarly, the intraparticle diffusion plots showed three linear portions during biosorption process. Freundlich, Langmuir, and Liu models were used to analyze the isothermal data; Liu equilibrium model gave the best fit of the isothermal data of CV biosorption onto ASP. The calculations from thermodynamic studies showed that CV biosorption onto ASP was an exothermic process and a feasible process. The combined data showed that avocado seed powder could be efficiently utilized for the treatment of dyes-rich wastewaters.

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