Adsorption of Pb, Cu and Cd from Water on Coal Fly Ash-Red Mud Modified Composite Material: Characterization and Mechanism

The rational utilization of solid waste has always been a worldwide concern. In this study, coal fly ash (CFA) and red mud (RM) were used in combination to synthesize efficient heavy metal adsorbents. A new way resource recycling was provided with the collaborative reuse CFA RM. To obtain modified composite materials, RM mixed melted three ratios. After modification, these materials then utilized adsorb Pb, Cu, Cd water both single ternary systems. physicochemical properties CFA, RM, measured by X-ray diffraction analysis, energy dispersive spectroscopy, scanning electron microscope, Fourier transform infrared vibrating sample magnetometer, surface area analyzer, porosity analyzer. systems, effects material dosage, solution pH, initial concentration metals, adsorption time discussed, results better fitted Langmuir isotherm pseudo-second-order kinetic. It discovered that had greater specific (63.83 m2/g) than alone, as well superior capacity magnetic characteristics. capacities C1R4 for 149.81 mg/g, 135.96 127.82 mg/g system, while those Cu decreased slightly preferential order ions Pb > Cd. Among best capacity.