Enhanced removal of cadmium ions using Moroccan natural clays: Characterization, kinetic, isotherm, thermodynamic, and regeneration investigations. (2022)

• Record Type: Journal Article
• Authors: Bassam, Rajaa; El Alouani, Marouane; Maissara, Jabrane; Rachdi, Younes; Jarmouni, Nabila; El Khattabi, El Hassan; Chbihi, Mohammed El Mahi; Belaaouad, Said
• Is Part Of: Materials today. Volume 62:Part 11(2022)
• Page Start: 6273
• Page End: 6280
• Publication Date: 2022
• Subjects: Clay -- Cadmium -- Adsorption -- Kinetic -- Isotherm -- Thermodynamic; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2022.02.536
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: This research focused on the performance of two Moroccan natural untreated clays AMQ (Quartz, Microcline, and Albite) and MAC (Quartz, Albite, and Muscovite) for the removal of cadmium ions (Cd (II)) from aqueous solution. These adsorbents were characterized using several techniques such as X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), Fourier transform infrared (FTIR), cation exchange capacity (CEC), and scanning electron microscopy (SEM). The adsorption process was affected including pH of the solution, adsorbent mass, contact time, initial concentration of Cd (II), and temperature. The optimal contact time was 30 min for AMQ and 45 min for MAC, the initial pH of the solution was range to 4.7 for AMQ and 5.3 for MAC using 0.5 g of each adsorbent at 25 °C. According to the kinetic data, the pseudo-second-order was more adapted to describe the removal process. The maximum recovery capacities of Cd (II) were founded using the Langmuir model at 15.25 mg/g for AMQ and 10.85 mg/g for MAC. The thermodynamic study showed that the adsorption of Cd (II) was exothermic, favorable, and spontaneous in nature. The regeneration of natural clays using acid indicated that these adsorbents have excellent recycling capacities.