Removal Of Lead (Pb2+) From Aqueous Solutions By Natural Bentonite

The aim of the present work is to investigate the ability of natural bentonite (untreated) from Pacitan, East Java to remove lead ions from aqueous solution. The bentonite has specific surface area and cation exchange capacity of 27.52 m2 g−1 and 65.20 meq/100 gr of bentonite, respectively. Towards this aim, batch adsorption experiments were carried out and the effect of various parameters on this removal process has been investigated. The effects of pH, grain size of bentonite, adsorption time and lead ion concentration on the adsorption process were examined. The optimum pH for adsorption was found to be 9, with the finer grain size of bentonite is more effective. In adsorption studies, residual lead ions concentration reached equilibrium in a duration of 24 hours. Adsorption of lead on bentonite appeared to follow Freundlich isotherm. Our results demonstrate that the adsorption process was mostly dominated by ion exchange process. Keywords: Removal, lead, aqueous solution, natural bentonite, adsorption

COPPER (Cu2+) REMOVAL FROM WATER USING NATURAL ZEOLITE FROM GEDANGSARI, GUNUNGKIDUL, YOGYAKARTA

Development of indusrialization and urbanization not only increase economic growth but also contribute to the environmental degradation, especially contamination of heavy metals in water. In other side, there are many geological materials have capability to immobilize heavy metals. Therefore, the objective of this research is to know the maximum capacity of natural zeolite from Trembono area, Gunung Kidul regency to immobilize copper (Cu2+) from water and to understand their mechanism. This experiment was carry out by a batch test. The result showed that the maximum capacity of zeolite to immobilize Cu (qmax) is 63,69 mmolCu/kg Zeolite according to Langmuir adsorption equilibrium model. In addition, the capability to immobilize Cu will increases due to decreasing the grain size. The result of this research can be used as an alternative for waste water treatment, especially Cu. Keywords: Removal, copper (Cu2+), natural zeolite, Langmuir isother

Removal of Copper from Batik Liquid Waste using Lignite

Industrial development and urbanization do not only increase economic growth but also contribute to environmental degradation, such as water contamination. Batik industry is one of domestic industries in Yogyakarta Province which produce a liquid waste containing copper (Cu2+). The concentration of copper in liquid waste has been found to be much higher than that WHO standard. The liquid waste produced in batik industry is commonly discharged directly to the rivers without any treatment, causing a serious environmental issue. lignite is one of many geological materials which have potential to absorb heavy metals. It is cheap and available locally, such as in Kulonprogo, one of districts in Yogyakarta. However, the potential application of lignite for increasing of community prosperity has not been investigated properly due to the low calorie value. The purpose of this study was to investigate the capability of lignite obtained from Kulonprogo to reduce Cu2+ in batik waste contaminated water and to understand the ion removal mechanism by conducting batch and column experiments. The results showed that Cu2+ ions in contaminated water samples decreased significantly due to complexation and cations exchange. This confirms teh potential use of lignite as a cost-effective material for treatment of liquid waste generated in Batik industry