In this paper, lengkeng shell was immobilization with sodium silica yo remove Cd (II) ion from aqueous soution by biosorption was investigative in a batch system immobilization of lengkeng shell can improve the ability of biosorbent in the process of absorption. The influence of solution pH and particle size. Were evaluated the result showed that the absorbent was good for the removal of Cd (II) ion with biosorption capacity of 22.587 mg/g at pH 5 and 250 μm particle size. Immobilization lengkeng shell showed the highles potential for the removal of toxic metal aqueous solution.

This study aims to determine the uptake capacity of langsat (Lansium domesticum) skin on the adsorption of dyes along with the contact time. Textile dyes are dyes which is harmful for the environment and living things. This textile industry waste can cause a decrease in water quality. When this carcinogenic dye enters the human body, it can lead to cancer. The process of these dyes adsorption use langsat skin samples. The components of langsat skin that can adsorb dyes are triterpenoids, saponins and flavonoids. This study uses a batch method by treating the contact time variations of several dyes. The results reveal that the biomass adsorption on rhodamine B, methyl orange, and methylene blue dyes were 11,578 mg/g, 3.8425 mg/g, 36,735 mg/g respectively and with optimum contact time of 60, 90 and 150 minutes, respectively.

No abstract

No abstract

The potensial of langsat (Lansium domesticum) shell powder to adsorb rhodamine B from aqueous solution has been investigated through bath experiments. The rhodamine B adsorption was found to be dependent on pH, initial rhodamine B concentration. The equilibrium data were described by Freundlich and Langmuir with the maximum adsorption capacity was 2,1531 mg/g in a pH 5. While the optimum concentration at 100 ppm with a capacity of 12,3743 mg/g. In order to know the biosorption mechanism FT-IR analyses were performed for langsat shell before and after uptake of rhodamine B. The result showed different functional groups on the biomass surface and the ability of these groups bind with rhodamine B in aqueous solution.