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Direct Arsenic Removal from Water Using Non-Membrane, Low Temperature Directional Solvent Extraction_to_submit.docx (1.41 MB)
Direct Arsenic Removal from Water Using Non-Membrane, Low Temperature Directional Solvent Extraction
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submitted on 12.02.2020, 07:10 and posted on 12.02.2020, 12:50by Jiaji Guo, Shirui Luo, Zeyu Liu, Tengfei Luo
poisoning in water due to natural minerals or industrial pollution is a
critical global problem that threatens the health and life of billions. Current
arsenic removal techniques involving chemical reaction, ion exchange, or
membrane processes can be expensive, inaccessible or infeasible for
underdeveloped regions or remote areas. Here, we demonstrate that using a so-called
directional solvent extraction (DSE) process, arsenicions in water can be effectively removed without the need of a membrane
or chemical reaction, and this process promises to utilize very low temperature
heat (as low as 45 oC). We have tested feed water with different arsenic
concentrations and arsenic ions in different forms (As-III and As-V) commonly
found in nature. It is demonstrated that DSE using decanoic acid as the
directional solvent can purify contaminated water to meet the drinking water
standard (arsenic concentration < 10 parts per billion, ppb), and the
arsenic removal efficiencies are higher than 91% for As-III and 97% for As-V.
Moreover, DSE can remove As-III
directly without the need of pre-oxidation, which is required in most of the
state of art techniques. DSE can potentially lead to effective arsenic removal
technologies with low resource settings that are suitable for remote and underdeveloped
regions, which are impacted by arsenic poisoning the most.