title: Adsorptive removal of dyes from aqueous solution onto carbon nanotubes: a review.
abstract: Adsorption is a widely used technique for the separation and removal of pollutants from wastewaters. Carbon nanotubes (CNTs) are emerging as potential adsorbents because of its well defined cylindrical hollow structure, large surface area, high aspect ratios, hydrophobic wall and easily modified surfaces. In this review, dye adsorption capability of CNTs and CNT based composites from aqueous system has been compiled. This article provides the information about the defect, adsorption sites on CNTs and batch adsorption studies under the influence of various operational parameters such as contact time, solution pH, temperatures etc. and deals with mechanisms involved in adsorption of dyes onto CNTs. From the literature reviewed, it is observed that single walled carbon nanotubes (SWCNTs) show higher adsorption capacity than multi walled carbon nanotubes (MWCNTs) and functionalized and CNT composite have better sorption capacity than as grown CNTs. It is evident from the literature that CNT based nanosorbents have shown good potential for the removal of dyes from aqueous solution. However, still more research work should be focused on the development of cost effective, higher efficient and environmental friendly CNT based nanosorbents for their commercial applications.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India. vinodfcy@gmail.com
authors.forename: Vinod Kumar
authors.initials: VK
authors.lastname: Gupta
authors.forename: Rajeev
authors.initials: R
authors.lastname: Kumar
authors.forename: Arunima
authors.initials: A
authors.lastname: Nayak
authors.forename: Tawfik A
authors.initials: TA
authors.lastname: Saleh
authors.forename: M A
authors.initials: MA
authors.lastname: Barakat
mesh_terms: D000327:Adsorption; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D037742:Nanotubes, Carbon / Q000737:chemistry*; D013696:Temperature; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D004396:Coloring Agents; D037742:Nanotubes, Carbon; D014874:Water Pollutants, Chemical; D014867:Water