Abstract
Wastewater treatment is of great concern in the textile industries because dyes, which are released into wastewater, are stable due to their structures and that some of the existing conventional techniques are not effective for aqueous removal of dyes. Among the advanced techniques for treatment of industrial effluents, adsorption is one of the most effective processes for removal of dyes from industrial wastewater. Similarly, activated carbons from different sources have been successfully applied as adsorbents for dye removal from aqueous solutions. In this context, this research evaluated the performance of activated carbon produced from peach pit (APC-1.0) for removal of a textile dye, Procion Red MX-5B (PR-5B), through batch adsorption process. The characteristic features of the peach activated carbon were obtained through Fourier transforms infrared spectroscopy, and scanning electron microscopy. The effectiveness of the activated to remove PR-5B from aqua system was compared with that of commercial activated carbon (CAC). In the kinetic study, the contact time was evaluated between 0 and 480 min using two different initial concentrations. Adsorption isotherms of PR-5B onto the two adsorbents were investigated in six different temperatures (298–326 K). The thermodynamic parameters of the process indicated spontaneous and exothermic adsorption. Equilibrium data were best described by Liu isotherm model with maximum removal capacities of 297.2 and 174.0 mg g−1 for APC-1.0 and CAC, respectively.
Highlights
Effluents containing dyes, when released into rivers, can cause serious environmental problems
Activated peach carbon (APC-1.0) was prepared from peach pit and its adsorption efficiency was tested for removal of a textile dye, Procion red MX-5B
The adsorption process was best described by the general-order kinetic model
Summary
Effluents containing dyes, when released into rivers, can cause serious environmental problems. The presence of dyes in water is undesirable due to the lasting color and can cause a decrease in water transparency even at low concentrations, thereby preventing the penetration of sunlight and hindering the process of photosynthesis and increasing the chemical oxygen demand (Bae and Freeman 2007; Rosales et al 2016). Some dyes can cause allergies, cancer, and mutations (Alves de Lima et al 2007; Demarchi et al 2013). The treatment of effluents containing dyes is one of the biggest challenges for the textile industry due to the fact that these substances have high chemical and structural stability, and are commonly persistent to the conventional wastewater treatments.
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