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Evaluation of Adsorption of Cadmium onto Ferrihydrite-Humic Acid Coprecipitation

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Cadmium in contaminated water attract public attention for its toxicity, bioavailability and removal difficulty. Two-line Ferrihydrite (Fh) coprecipitated with humic acid (HA) is expected to provide an environment friendly and highly efficient adsorption process for aqueous cadmium removal. C–Fe coprecipitates were prepared and examined by X-ray Diffraction (XRD), Scanning electron microscope (SEM) and Fourier transform infrared spectra (FTIR), and the product was determined as 2L ferrihydrite with poor crystallinity. The influence of adsorbent dosage, relative ionic strength, pH, adsorption time and initial concentration on adsorption mechanism was investigated. The experimental results showed the removal rate of Cd(II) was up to ∼99.76% from aqueous solutions. The adsorption isotherms followed the Langmuir isotherm model better than the Freundlich isotherm model. The adsorption kinetic data could be described well by Lagergren second-order kinetic equation, which assumes chemical adsorption. The amount of Cd adsorbed is a function of pH, alkaline environment can reinforce adsorption due to dissociation of phenolic groups to inhibit H bond generation which can contribute to aggregation.
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Document Type: Research Article

Publication date: September 1, 2019

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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