Presentation on theme: "Carbonaceous Adsorbents: Design, Fabrication and Application in Water Treatment Lunhong Ai Chemical Synthesis and Pollution Control Key Laboratory of Sichuan."— Presentation transcript:
1 Carbonaceous Adsorbents: Design, Fabrication and Application in Water Treatment Lunhong AiChemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering, China West Normal University
6 L. Ai et al. / Chemical Engineering Journal 156 (2010) 243–249 1. Fabrication of activated carbon/CoFe2O4 composites and their application in water treatment(c)XRDSEMTEMAC/CFOCFOmagnetic separationtexture property(d)SamplesBET-surface area (m2 g-1)Total pore volume (cm3 g-1)AC9090.47AC/CFO4630.18L. Ai et al. / Chemical Engineering Journal 156 (2010) 243–249
7 Removal of malachite green (MG) Effect of pHEffect of initial concentrationregenerationEffect of contact time
8 2. Adsorption mechanism of methyl orange (MO) and basic fuchsin (BF) on AC/CFO L. Ai, et. al. / Desalination 262 (2010) 134–140
9 adsorption kineticsAdsorption kineticspseudo-first-order modelpseudo-second-order modelElovich model※ adsorption kinetics was best described by the pseudo-second-order model
10 Table 1 Kinetic parameters for adsorption of dyes on AC/CFO adsorption kineticsTable 1 Kinetic parameters for adsorption of dyes on AC/CFODyePseudo-first-orderPseudo-second-orderElovichqe,exp(mg g-1)k1(min-1)qe,calR2k2(g mg-1 min-1)abBF49.880.0676.830.98160.02250.5312.24141.1670.9624MO47.310.0847.150.93720.02647.940.99991.88639.9790.9531
11 Adsorption mechanisms intraparticle diffusionintraparticle diffusionsurface adsorptionsurface adsorptionintraparticle diffusion model※ the adsorption process was controlled by surface adsorption (boundary-layer effect) and intraparticle diffusion.
12 adsorption mechanisms Boyd kinetic model was generally used to determine the actual rate-controlling step involved in the dye adsorption process.Boyd model※ boundary-layer effect mainly governed the rate-limiting process of dye adsorption on AC/CFO
13 adsorption isothermsAdsorption isothermsLangmuir and Freundlich models※ Dye adsorption behaviors onto AC/CFO could be better represented by the Langmuir model (R2 > 0.99)※ Monolayer adsorption capacities of MO and BF determined from the Langmuir isotherm are 95.8 and mg g−1, respectively
14 adsorption isothermsDubinin-Radushkevich (D-R) modelFor D-R model, the magnitude of E(mean fren energy) is useful for estimating the type of adsorption and if this value is between 8 and 16 kJ mol−1, the adsorption proceeds by surface adsorption.In this study, the E values for MO and BF are calculated to be and kJ mol−1.
15 Adsorption capacity (mg g-1) BF AC/CFO (in this study) 101.01 Table 3. Comparison of BF and MO adsorption capacities of various adsorbentsDyeAdsorbentsAdsorption capacity (mg g-1)BFAC/CFO (in this study)101.01Bottom ash6.39Deoiled soya12.03Jalshakti®11.7Industrial sludges70.4MO95.78Hypercrosslinked polymeric adsorbent70.922Banana peels21Orange peels20.5Activated Carbon9.49Modified sporopollenin5.23NH3+-MCM-41366.57
16 AcknowledgementFinancial support from the Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province and Scientific Research Start-up Foundation of China West Normal University (07B005).