Isotherms and kinetic study of ultrasound-assisted adsorption of malachite green and Pb2+ ions from aqueous samples by copper sulfide nanorods loaded on activated carbon: Experimental design optimization

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 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), Pb concentration (3-15mgL) 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 Pbions) was obtained at pH 6.0, 0.009g CuS-NRs-AC, 6.0min mixing by sonication and 15 and 6mgL for MG and Pb ions, respectively. High determination coefficient (R>0.995), Pred-R-value (>0.920) and Adju-R-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 for MG and Pb ions, respectively. This adsorbent over short contact time is good choice for simultaneous removal of large content of both MG and Pb ions from wastewater sample.

Sulfamic acid incorporated HKUST-1: a highly active catalyst and efficient adsorbent

“…A comparison study was made between the results achieved in this work through 10 wt% SA@HKUST-1 with those obtained by other adsorbents reported previously in the literature e.g. Bentonite, 72 CNF aerogel, 73 almond gum, 74 CuS-NRs-AC, 75 ZnS:Cu-NP-AC, 76 CO 2 -activated carbon (CAC). 77 The results demonstrated that SA@HKUST-1 among other various adsorbents mentioned above and reported at Table 6S, † behaves as an effective adsorbent for adsorption of MG dye and Pb(II) with respect to maximum adsorption capacity (mg g À1 ).…”

Synthesis of CuS and ZnO/Zn(OH)2 nanoparticles and their evaluation for in vitro antibacterial and antifungal activities

“…The CuS‐NPs were synthesized based on the reaction of the mixture of copper acetate (Cu (CH 3 COO) 2 .H 2 O) with thioacetamide (CH 3 CSNH 2 ) in aqueous media. In a typical synthesis, 10 ml of 0.1 mol L −1 copper acetate solution and 20 ml of 0.2 mol L −1 tri‐sodium citrate solution as capping agent were taken into a 100 ml beaker. In the next step, 5 ml of 0.4 mol L −1 thioacetamide (TAA) as source for S 2− ions was slowly added to the solution.…”

Synthesis and characterization of kaolinite coated with copper oxide and its effect on the removal of aqueous Lead(II) ions

“…Here, C t /C 0 versus time provided the slopes of the curves derived from Eq. 4 Here, C t and C 0 denote the initial concentrations of Pb 2+ at time t, S s equals the exposed specific surface area of the adsorbent, and Kf denotes the coefficient of mass transfer (Sharifpour et al 2018). These models as reviewed by Qiu et al (2009) and derived from the Freundlich isotherm were adopted to describe sorption of Pb 2+ ions.…”