Chemists Use Superabsorbent, Reusable Powder to Remove Oil From Water

NYU Abu Dhabi Researchers Develop Cost-Efficient Solution for Oil Spills

Press Release

CalP is a super-absorbent, re-useable material that can potentially be used to make cleaner fuel in the future

Scientists at New York University Abu Dhabi (NYUAD) have developed a new technique to remove toxic contaminants from water. CalP, as it has been named, is calix[4]arene-based superhydrophobic porous material that acts as a water purifier by repelling water and attracting toxins like oil and dye.

“CalP is a light brown powdered material which can absorb up to seven times its weight of oil from an oil and water mixture,” said Dinesh Shetty, lead researcher and chemist at NYUAD.

“While the basic material itself has been around for decades, this is the first porous organic calix[4]arene-based polymer synthesized in the lab for the purpose of purifying water,” he explained.

CalP has the ability to remove oil from water efficiently and quickly. Ali Trabolsi, assistant professor of chemistry at NYUAD said: “CalP floats, has high surface area, and low density. It also has pores both from calix[4]arene cavity and hyper-crosslinked 3D structure that collects toxins. The material is superhydrophobic, which means it repels water, while also containing the ability to absorb a range of pollutants.”

The researchers tested CalP in the lab using both engine oil and commercial grade crude oil.

“After being placed on top of an oil-water mixture, the light brown powder quickly absorbed the oil and turned dark brown,” said Shetty. “Complete absorption of the oil happened in about five minutes.”

Further experiments were conducted replacing oil with different types of dyes and yielded the same impressive results. In one experiment, toxic dye was poured into a glass of water and within five minutes of its interaction with CalP, 80 percent of the dye was absorbed by the material and all of it was separated from the water after 15 minutes. This, in spite of dyes being chemically designed to withstand degradation.

In addition to acting as a quick and efficient solution to absorbing pollutants from water, one of CalP’s most useful properties is that it is re-useable, making it a potentially cost-effective solution to cleaning oil spills. “This was an important part of our discovery,” added Ilma Jahovic, student researcher and chemistry major at NYUAD.

She said: “We found it was very easy to regenerate the material even after it was soaked in oil or dye. We did multiple cycles and its efficiency was maintained. Other similar materials can be re-used but require cleaning at high temperatures which makes the process expensive,” she explains. CalP on the other hand requires mild washing with diethyl ether, ethanol or a light acidic solution.”

Currently, CalP is not developed enough to use on large oil spills, as it is being worked on at gram scale in the lab environment. The research will now focus on further improving its absorption efficiency of oil products, and to find ways to make its production cheaper.

“Once developed further, CalP could potentially also be used to further other areas of petroleum research such as gas separation, to make cleaner fuel,” added Jahovic.


About NYU Abu Dhabi

NYU Abu Dhabi is the first comprehensive liberal arts and science campus in the Middle East to be operated abroad by a major American research university. NYU Abu Dhabi has integrated a highly-selective liberal arts, engineering and science curriculum with a world center for advanced research and scholarship enabling its students to succeed in an increasingly interdependent world and advance cooperation and progress on humanity’s shared challenges. NYU Abu Dhabi’s high-achieving students have come from 120 nations and speak over 120 languages. Together, NYU's campuses in New York, Abu Dhabi, and Shanghai form the backbone of a unique global university, giving faculty and students opportunities to experience varied learning environments and immersion in other cultures at one or more of the numerous study-abroad sites NYU maintains on six continents.