This research aimed to evaluate the potential of razor clam (Ensis directus) shell, a fishery waste material, as an adsorbent for the removal of heavy metals and dyes from aqueous  solution. This research is divided into three parts, namely characterisation studies, adsorption  studies and desorption studies. Several analytical instruments such as scanning electron microscope  (SEM), energy dispersive x-ray (EDX) spectrometer and Fourier transform infrared (FTIR)  spectrometer were used to characterise the adsorbent. In this study, three metal ions (Cd(II),  Cu(II) and Pb(II)) and four dyes (Congo red (CR), methylene blue (MB), Rhodamine B (RB) and methyl  orange (MO)) were used as contaminants. A series of adsorption tests were carried out as a function  of solution pH, adsorbent dosage and initial adsorbate concentration. The adsorption capacity of  razor clam shell for metal ions and dyes from aqueous solutions was evaluated in both single and  mix systems. The de.....

6095 hits

Wastewater originating from industrial effluents contains many types of pollutants including dyes. Anionic and cationic dyes are very toxic and they can cause several problems to aquatic system. In present study, razor clam shell was used as a potential adsorbent to remove two classes of dyes, namely anionic (Congo red, CR) and cationic (Rhodamine B, RB) dyes from aqueous solution. Batch adsorption experiments were performed to study the effects of three experimental parameters, namely solution pH, adsorbent dosage and initial dye concentration, on adsorption capacity of CR and RB onto razor clam shell. Results indicated that pH 2.0 was optimum pH for adsorbent to adsorb both CR and RB. At an initial concentration of 20 mg/L, the removal percentages of CR and RB were 97% and 38%, respectively. The Freundlich and Langmuir isotherm models were used to describe adsorption behaviour of CR and RB, as well as the relationship between adsorbent and adsorbate. The adsorption equilibrium data w.....

407 hits