Explanation:

 Only statement 1 is correct. Researchers have for the first time used a naturally occurring material — aloe vera gel — which inherently has superior oil repelling (oleophobic) property to separate oil from water. The oleophobicity of the gel remained intact when exposed to various chemically harsh conditions such as very acidic (pH 1) and highly alkaline (pH 12) medium, artificial sea water and river water for 30 days. The team led by Dr. Uttam Manna from the Department of Chemistry at Indian Institute of Technology (IIT) Guwahati used the thick gel contained in the leaves of aloe vera plant to convert a commercially available porous material that is oil-loving (oleophilic) to become extremely oil-repelling by coating it with the gel.