Isotherms and kinetic study of ultrasound-assisted adsorption of malachite green and Pb(2+) ions from aqueous samples by copper sulfide nanorods loaded on activated carbon: Experimental design optimization.

Title Isotherms and kinetic study of ultrasound-assisted adsorption of malachite green and Pb(2+) ions from aqueous samples by copper sulfide nanorods loaded on activated carbon: Experimental design optimization.
Authors E. Sharifpour; H.Zare Khafri; M. Ghaedi; A. Asfaram; R. Jannesar
Journal Ultrason Sonochem
DOI 10.1016/j.ultsonch.2017.07.030
Abstract

Copper sulfide nanorods loaded on activated carbon (CuS-NRs-AC) was synthesized and used for simultaneous ultrasound-assisted adsorption of malachite green (MG) and Pb(2+) ions from aqueous solution. Following characterization of CuS-NRs-AC were investigated by SEM, EDX, TEM and XRD, the effects of pH (2.0-10), amount of adsorbent (0.003-0.011g), MG concentration (5-25mgL(-1)), Pb(2+) concentration (3-15mgL(-1)) and sonication time (1.5-7.5min) and their interactions on responses were investigated by central composite design (CCD) and response surface methodology. According to desirability function on the Design Expert optimum removal (99.4%±1.0 for MG and 68.3±1.8 for Pb(2+)ions) was obtained at pH 6.0, 0.009g CuS-NRs-AC, 6.0min mixing by sonication and 15 and 6mgL(-1) for MG and Pb(2+) ions, respectively. High determination coefficient (R(2)>0.995), Pred-R(2)-value (>0.920) and Adju-R(2)-value (>0.985) all are good indication of best agreement between the experimental and design modelling. The adsorption kinetics follows the pseudo-second order model and adsorption isotherm follows the Langmuir model with maximum adsorption capacity of 145.98 and 47.892mgg(-1) for MG and Pb(2+) ions, respectively. This adsorbent over short contact time is good choice for simultaneous removal of large content of both MG and Pb(2+) ions from wastewater sample.

Citation E. Sharifpour; H.Zare Khafri; M. Ghaedi; A. Asfaram; R. Jannesar.Isotherms and kinetic study of ultrasound-assisted adsorption of malachite green and Pb(2+) ions from aqueous samples by copper sulfide nanorods loaded on activated carbon: Experimental design optimization.. Ultrason Sonochem. 2018;40(Pt A):373382. doi:10.1016/j.ultsonch.2017.07.030

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