Semnan University of Medical Sciences

Research and Technology Vice Chancellor

Rastgou, Tayyabeh and Hassani, Amir Hessam and Moeinian, Khalilollah and Mehdinia, Seyyed Mahmood (2016) Replacement of lemon juice wastes instead of strong inorganic acids in production of silica from rice husk and efficiency of produced adsorbents in removal of cadmium from aqueous solutions. Koomesh. pp. 373-379.

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    Abstract

    Introduction: Production of adsorbent using agricultural wastes has important economic and environmental advantages. The aim of this study was Production of silica absolutely using agricultural wastes and determination of efficiency of produced adsorbents in removal of cadmium from aqueous solutions. Materials and Methods: In this experimental study, two different type of acidic pretreatment and then thermal treatment was used for silica production from rice husk. The efficiency of the produced adsorbents was studied in four pH states, four cadmium concentration values, five adsorbents dosages and six different contact times. Cadmium concentration was determined by atomic absorption spectrophotometry. Results: silica was produced in the two procedures and both produced silica had good morphological and physical characteristics. The maximum efficiency of cadmium removal at pH= 6, adsorbent dosage of 3 g/l, contact time of 120 min and initial cadmium concentration of 5 mg/l, for rice husk silica produced by strong inorganic acids and waste lemon juice were respectively %90.1, %60.8. The adsorption processes followed the Freundlich isotherm)generally R2 ≥0.99(. Conclusion: According to the results of this study, good rice husk silica can be produced using absolutely agricultural wastes (rice husk and lemon juice) and produced silica can be used as an effective and cheap adsorbent for removal of cadmium from aqueous solutions Keywords: Wastewater, Cadmium, Silicon Dioxide, Rice husk, lemon juice, Adsorption

    Item Type: Article
    Subjects: R Medicine > R Medicine (General)
    Divisions: Faculty of Medical Sciences > School of Medicine
    Depositing User: Mr Vahab Moshtaghi
    Date Deposited: 01 Jul 2017 10:00
    Last Modified: 01 Jul 2017 10:00
    URI: http://eprints.semums.ac.ir/id/eprint/1057

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