MEMBRANELESS PURIFICATION OF HEAVY （MEMBRANELESS净化的重）.pdfVIP

MEMBRANELESS PURIFICATION OF HEAVY METAL CONTAMINATED WATER BY ION CONCENTRATION POLARIZATION 1* 2* 3 3 Sung Jae Kim , Bumjoo Kim , Rhokyun Kwak , Katherine Y. Zhu , Geunbae Lim2** and Jongyoon Han3** 1Seoul National University, South Korea, 2POSTECH, South Korea, 3Massachusetts Institute of Technology, USA * ** equally contributed first author, equally contributed corresponding author ABSTRACT The lethal threats to human health from heavy metals are associated with untreated ground water. We developed a high throughput single step heavy metal purification process based on Ion Concentration Polarization mechanism. Instead of microfluidic channel networks, the plastic prototype made of plastic meshes and Nafion nanoporous material was built so that the manufacturability and cost efficiency were maximized. Modeled heavy metal contaminated water was filtered below the safe concentration. Based on the demonstration, one can expect to achieve a 100mL/min throughput from a 2.5inch portable system which is capable of desalting seawater, purifying heavy metals and disinfecting biological contaminants. KEYWORDS Water purification, seawater desalination, ion concentration polarization, nanoporous membrane, nanofluidics, electrokinetics INTRODUCTION Groundwater contamination by heavy metal compounds is a significant problem in many countries [1]. Arsenic (As), cadmium (Cd) and lead (Pb) ions in drinking water can cause serious illness such as skin cancer, kidney damage and gastrointestinal uptake. Current methods for heavy metal removal