title: Immobilized graphene-based composite from asphalt: facile synthesis and application in water purification.
abstract: An in situ strategy for the preparation of graphene immobilized on sand using asphalt, a cheap carbon precursor is presented. The as-synthesized material was characterized in detail using various spectroscopic and microscopic techniques. The presence of G and D bands at 1578 cm(-1) and 1345 cm(-1) in Raman spectroscopy and the 2D sheet-like structure with wrinkles in transmission electron microscopy confirmed the formation of graphenic materials. In view of the potential applicability of supported graphenic materials in environmental application, the as-synthesized material was tested for purifying water. Removal of a dye (rhodamine-6G) and a pesticide (chlorpyrifos), two of the important types of pollutants of concern in water, were investigated in this study. Adsorption studies were conducted in batch mode as a function of time, particle size, and adsorbent dose. The continuous mode experiments were conducted in multiple cycles and they confirmed that the material can be used for water purification applications. The adsorption efficacy of the present adsorbent system was compared to other reported similar adsorbent systems and the results illustrated that the present materials are superior. The adsorbents were analyzed for post treatment and their reusability was evaluated.
authors: DST Unit on Nanoscience, Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
authors: Theruvakkattil Sreenivasan
authors: TS
authors: Sreeprasad
authors: Soujit Sen
authors: SS
authors: Gupta
authors: Shihabudheen Mundampra
authors: SM
authors: Maliyekkal
authors: Thalappil
authors: T
authors: Pradeep
mesh_terms: D000327:Adsorption; D004390:Chlorpyrifos / Q000302:isolation & purification*; D006108:Graphite / Q000138:chemical synthesis*; D006838:Hydrocarbons / Q000737:chemistry*; D007700:Kinetics; D012235:Rhodamines / Q000302:isolation & purification*; D013059:Spectrum Analysis, Raman; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D018508:Water Purification
chemical_list: D006838:Hydrocarbons; D012235:Rhodamines; D014874:Water Pollutants, Chemical; C026188:rhodamine 6G; D006108:Graphite; C006647:asphalt; D004390:Chlorpyrifos