FUW TRENDS IN SCIENCE & TECHNOLOGY JOURNAL
(A Peer Review Journal)
e–ISSN: 2408–5162; p–ISSN: 2048–5170
keywords: Biosorbent; calcareous and cockle shell; heavy metal ions; sorption equilibrium
This study examined the suitability of cockle shell (CS) powder in the removal of Pb2+ and Zn2+ metal ions. The high rate of discharge of heavy metals often regarded as cumulative poisons into the environment through industrial processes and metallic waste prompted this research. The properties of this calcareous adsorbent were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) channel structure measurements and Fourier Transform Infrared spectrometry (FTIR). The influences of concentration, pH, contact time, adsorbent dose and temperature on the sorption capacity of these adsorbents were investigated. The results revealed cockle shell as a good adsorben t for both Pb2+ and Zn2+ ions in aqueous media with both ions exhibiting competitive adsorption behaviour. At a solution concentration of 100 mg/L, Pb2+ and Zn2+ uptake by cockle shell were 24.66 and 21.70 mg/g, respectively. The adsorption of these metal ions was modelled using Langmuir, Freundlich, Temkin and Dubinin-Raduskevich isotherms. Freundlich and Dubinin-Radushkevichisotherms adequately described the sorption Zn2+ and Pb2+, respectively by the cockle shell. The thermodynamics and kinetics studies also revealed that the adsorption process was endothermic in nature and followed pseudo second order.
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