New portable water purification device can remove salt simultaneously

According to a report recently organized by the Physicist Organization Network, an international research team consisting of the Singapore University of Technology and Design, the Massachusetts Institute of Technology and other institutions demonstrated a portable water purifier, the size of a teapot, in a new study. The device not only filters out contaminants in the water, but also removes salt ions contained in salt water, paving the way for the next generation of portable water purification equipment. The related paper was published in a recent issue of Nature Communications.

Dr. Han Zhaojun of the research team said that the device incorporates a plasma-treated carbon nanotube-enhanced water purification membrane that pours sewage into one end, and the other end is clean drinking water. The device is rechargeable, inexpensive, and more effective than many existing filtration methods.

Dr. Han said: "In some developing countries and remote areas, small portable purification devices are increasingly seen as the best way to meet the needs of clean water and sanitation, which can minimize the risk of many serious diseases."

He admitted that some smaller portable water treatment equipment already exists. However, because they rely on reverse osmosis and thermal processes to remove salt ions, they cannot filter out organic contaminants found in saltwater in some river and lake systems. He said, “Sometimes, salt water is the only source of water for people in remote areas. This shows the important use of this new type of equipment, which can not only remove salt from salt water, but also filter the water through the purification process. Studies have shown that carbon nanotube films can filter out ions of completely different sizes, which means that they can remove salt and other impurity ions together in water."

Professor Kostya, director of the CSIRO Plasma Nanosciences Laboratory, added that the disadvantage of existing portable devices is that they need continuous power to run their thermal processes. The new filter membrane can be operated as a rechargeable device. The success of the new filter membranes is attributed to the unique properties demonstrated by plasma-treated carbon nanotubes: First, ultra-long carbon nanotubes have a very large surface area and are ideal filter materials; second, nanotubes are easily modified to allow Its surface properties are treated by localized nano plasmas.

Now that researchers have demonstrated the effectiveness of the method, it is planned to extend the study to see the filtration performance of other nanomaterials. They will begin to observe graphene with similar properties to carbon nanotubes. (Hua Ling)

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