Direct Arsenic Removal from Water Using Non-Membrane, Low-Temperature Directional Solvent Extraction

Jiaji Guo, Shirui Luo, Zeyu Liu, Tengfei Luo

Research output: Contribution to journalArticlepeer-review


Arsenic (As) poisoning in water is a critical global problem. Current arsenic removal techniques involving chemical reaction, ion exchange, or membrane processes can be expensive, inaccessible, or infeasible for underdeveloped regions. Here, we demonstrate that by using a so-called a directional solvent extraction (DSE) process arsenic ions in water can be effectively removed without membrane or chemical reaction, and this process promises to utilize low temperature heat (as low as 45 °C). We have tested feedwater 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. DSE can potentially lead to effective arsenic removal technologies with low resource settings.

Original languageEnglish (US)
Pages (from-to)2938-2946
Number of pages9
JournalJournal of Chemical and Engineering Data
Issue number6
StatePublished - Jun 11 2020
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


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