Abstract
• Fe/Cr layered double hydroxide was developed as a new adsorbent. • A simple smartphone-based colorimetric device was used as a portable detector. • The proposed method was utilized for removal of Hg 2+ ion from water samples. In this paper Fe/Cr layered double hydroxide was synthesized and used as a new adsorbent for removal of Hg 2+ ion from aqueous solutions. Adsorbent characterizations were investigated using Fourier transform infrared (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and nitrogen adsorption/desorption isotherm. Subsequent the effect of parameters on removal efficiency of Hg 2+ ion such as pH, initial concentration of Hg 2+ ion, the amount of adsorbent, temperature, and contact time were investigated. The possibility of adsorbent reusability was also investigated. The optimal condition was pH 5, temperature 25 °C, adsorbent dosage 20 mg, and contact time 120 min. Adsorption isotherm was evaluated and the results showed that obtained data can be fitted to the linear Langmuir model. The maximum adsorption capacity for Hg 2+ ion was 116 mg g −1 . The adsorption kinetic was also investigated and the obtained data can be explained by the linear pseudo -second order model. A simple and portable smartphone -based colorimetric device was used to obtain mercury ion concentrations . In this experiment, the detection limit of the method was 0.2 mg L −1 and the linear range was 0.25 to 15 mg L −1 . Finally, the results indicated the high efficiency of the adsorbent in removing Hg 2+ ion from industrial effluents .
Published Version
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