Search

Efficient hybrid multifunctional composite was elaborated in order to eliminate cationic dyes (methylene blue and crystal violet). Lemon peels-biomass-Derived and activated carbon were encapsulated with calcium alginate in order to obtain the hybrid composite. Several analyses were used to characterize the composite such as Elementary analysis, FTIR, PXRD, SEM, BET, and pHPZC. Adsorption studies were investigated according to different operational conditions. High adsorption stability via pH was observed from 5 to 11. MB adsorption process was found to be spontaneous and exothermic nature, proven by the negative value of ΔH° and ΔG°. Isotherm study revealed that the experimental adsorbed Methylene blue amount on the composite reached 1130.97 mg/g. Langmuir, Freundlich, and Toth models were applied to analyze isotherm adsorption. Langmuir and Toth models show the highest correlation coefficients R2> 0.985 and R2> 0.994 respectively. Binary equilibrium study showed that the presence of CV reduces MB removal indicating the competitiveness between the two cationic dyes. Reusability study of composite was investigated through six cycles of adsorption–desorption. Adsorption performance was decreased with increase on cycle’s numbers. Prepared new hybrid composite is considered as highly recyclable and efficient adsorbent for organic dyes, it contributes to reduce more the process cost.

This study adopted acid treatment of palm petioles for preparing (APP), which reached notably the whole removal ratio of 99% (60 min) of methylene blue (150 mg/L) and can still maintain good performance after 5 cycles. The adsorbents were analyzed using SEM, FTIR, pHPZC, and SSA estimation by methylene blue adsorption. The modification of the rough palm petiole with phosphoric acid enables the APP to enhance the intensity of MB adsorption from wastewater. With high R2and the lowest RMSE, the pseudo-second-order model is the most suitable model that describes MB adsorption on APP. There is an intraparticle diffusion, which occurs with the pseudo-second-order. pH has a great effect on MB removal. MB adsorption process was found to be spontaneous and the exothermic. Langmuir model gives very satisfactory results with value of correlation coefficient > 0.93, and the lowest values of RMSE, and saturated monolayers with values of quantities adsorbed close to experimental values. The progressive elimination percentages of the MB on APP were from 95.03% to 41.87% from the first cycle to the fifth cycle of adsorption–desorption. Obtained results have shown that APP is a very promoting adsorbent in the field of wastewater treatment.