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( Irwin Maulana ),( Fumitake Takahashi ) 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2016 No.-
Cyanide-containing wastewater, which is commonly produced from industrial activities such as gold and silver extraction and metal plating, has been categorized as hazardous waste that should be treated properly by using any possible methods before discharging into the environment. Currently, the trend of using adsorbent materials for cyanide removal is increasing since there are many reports describe the possibility of activated carbon, modified natural zeolite, and several bio-adsorbent materials to remove cyanide [1]. This might be related with the advantages of cyanide adsorption compared with other conventional cyanide treatments. However, there is almost no paper which shows the potential of synthetic zeolite for cyanide removal process which could be the lack of knowledge in cyanide removal by adsorption method. Hence, this study has been undertaken to investigate the possible potential of raw-synthetic zeolite for cyanide removal as well as to study the adsorption kinetics of the process. A fix dose at 10g/l of ZSM-5 synthetic zeolite with SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> ratio of 23 and surface area of 425 m<sup>2</sup>/g was used as the adsorbent material for cyanide uptake experiments conducted at room temperature and a constant shaking speed at 200 rpm within several variation of contact time with three different initial cyanide concentration; 50, 100, 200 mg/l (pH 10.5-11) via batch experiments. The experimental data obtained were then used for studying the kinetics of the process and modelling the adsorption behavior of the materials. Fig. 1(a) showed good cyanide adsorption ability of the raw-synthetic zeolite which is related with anion adsorption theory based on complexation mechanism [2]. The cyanide removal percentage reached almost 100% after 24 hours contacted with zeolite. While as depicted in fig. 1(b), the pseudo-first-order model has better adequacy in representing the kinetic of cyanide adsorption into the surface of the zeolite material. The linear regression in fig. 1(b) confirmed the removal of cyanide by raw-synthetic zeolite follows the model with good correlation coefficient.
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