Abstract
Reductive adsorption of chromium (Cr) has been investigated, employing coal-based activated carbon with batchwise study. The adsorption was carried out by varying parameters such as pH of the aqueous solution and contact time. Cr(III) was hardly adsorbed on activated carbon, and it was precipitated at high pH region. High adsorption amounts of Cr(VI) was obtained at pH range 4.5 – 5.5. In the adsorption process, reduction of Cr(VI) to Cr(III) was occurred at especially acidic pH region, and thus most of Cr remained in the aqueous solution in this pH region was Cr(III).
Highlights
Increasing attention is being given to human health hazards caused by the contamination of toxic heavy metals in the water environment and their accumulation in human body has been a serious health problem
Chromium (Cr) is one of the contaminants which exists in hexavalent form (Cr(VI)) and trivalent form (Cr(III)), and Cr(VI) possesses significantly higher level of toxic than Cr(III)
The activated carbon was characterized by a zeta potential analyzer (ELSZ-1000, Otsuka Electronics Co., Ltd.)
Summary
Increasing attention is being given to human health hazards caused by the contamination of toxic heavy metals in the water environment and their accumulation in human body has been a serious health problem. Reduction of Cr(VI) to Cr(III) is effective for detoxication, since the toxic of Cr(III) is much lower than that of Cr(VI) 100 times (Chen et al, 2018) Various of materials, such as iron compounds (Ali et al, 2015), ion exchange resin (Pehlivan and Cetin, 2009), activated carbon (Chen et al, 2018; Kobya et al, 2004), magnetic chitosan (Zheng et al, 2018) and nickel oxide (Behnajady and Bimeghdar, 2014), were reported. The reductive adsorption of Cr(VI) with coal-based activated carbon was investigated
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