[
    {
        "id": "osp-13174",
        "type": "article-journal",
        "title": "Uptake of Cd(II) Using Natural Zeolite: Batch and Continuous Fixed-Bed Studies",
        "author": [
            {
                "family": "LMarashdeh",
                "given": "Luna M."
            },
            {
                "family": "Al-Haj-Ali",
                "given": "Ahmad M."
            }
        ],
        "URL": "https://omanscience.com/ar/articles/uptake-of-cd-ii-using-natural-zeolite-batch-and-continuous-fixed-bed-studies",
        "language": "en",
        "issued": {
            "date-parts": [
                [
                    2009
                ]
            ]
        },
        "container-title": "The Journal of Engineering Research",
        "volume": "6",
        "issue": "2",
        "page": "1",
        "DOI": "10.24200/tjer.vol6iss2pp1-11",
        "publisher": "Sultan Qaboos University",
        "ISSN": "1726-6009",
        "abstract": "Uptake of Cd(II) ions by natural phillipsite tuff was investigated both in shake-flask and fixed-bed columns. Equilibrium uptake, qe, was found to best fit Langmuir adsorption isotherm with a maximum value of 25.78 mg/g. Percent removal of Cd ions was close to 100% from initial metal ion concentrations in the range 50 - 75 mg/L at 5.0 g zeolite/L. Also, qe was found to vary exponentially with zeolite dose. Break points as high as 350 minutes were obtained from bed treatment at favorable conditions of a low solution flow rate and high bed depth. In batch experiments, equilibrium pH increased to < 8.0 excluding chemical precipitation as part of the removal while in fixed-beds the final pH exceeded 9.0. It is suggested that a sieve action of zeolite porous structure plays a role as an uptake mechanism in addition to the ion exchange."
    }
]