Batch experiments on arsenic removal efficiencies through adsorption using synthetic and natural sand samples
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ORIGINAL PAPER
Batch experiments on arsenic removal efficiencies through adsorption using synthetic and natural sand samples S. A. Khan1 · M. A. Imteaz2 Received: 17 August 2020 / Revised: 11 October 2020 / Accepted: 31 October 2020 © Islamic Azad University (IAU) 2020
Abstract Recently it has been unearthed that many potable water sources around the world are contaminated with arsenic, which has got long-term health hazards for the consumers. Among different arsenic removal techniques, adsorption is widely used and easily achievable. Through the use of suitable adsorbent, arsenic can be significantly removed from potable water, which is a dire need for many distant communities where there is scarcity of alternative potable water source. This paper presents arsenic removal characteristics of different synthetic and natural sand samples through adsorption. To replicate the Skye sand which was found to be effective in removing arsenic, two synthetic sand samples (one coated with iron and the other coated with aluminium) were prepared in the laboratory. Different combinations of these samples were tested through batch experiments to evaluate their arsenic removal efficiencies under different conditions. It is found that among the synthetic adsorbents, the ones dried at 80 °C (during their preparation) showed the highest arsenic removal efficiencies. Also, among all the samples, iron oxide-coated sand (IOCS) showed the highest arsenic removal efficiencies, varying from 71 to 100% depending on the amount of doses, whereas with the use of natural Skye sand with the same variation in doses, arsenic removal efficiencies varied from 26 to 90%. Keywords Arsenic · Adsorption · Iron coated · Aluminium coated · Skye sand
Introduction With the rapid increase in population as well as numerous uses of water for different industries and agriculture, in the current world, many authorities are facing tremendous pressure to maintain the ever-increasing water demand. In addition to this, among the regions which used to extract groundwater for their potable water supplies, many of those groundwater sources are found to be contaminated with arsenic. It is evident that consumption of arsenic-contaminated water for a longer period causes several diseases and considered to be a health hazard. On top of that many of those contaminated regions do not have any other alternative potable Editorial responsibility: M. Shabani. * M. A. Imteaz [email protected] 1
School of Chemistry, Monash University, Melbourne, VIC 3800, Australia
Department of Civil & Construction Engineering, Swinburne University of Technology, Melbourne, VIC 3122, Australia
2
water source. As such it is imperative for the communities in those regions to use suitable technique(s) to treat the arsenic-contaminated water before it is consumed. Nicomel et al. (2016) provided details account of numerous technologies used around the world for arsenic removals from water. Commonly used arsenic removal techniques are oxidation/reduction reaction, precipitation, adsorpt
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