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Glaydson Simões dos Reis,Mohammad Khalid Bin Mahbub,Michaela Wilhelm,Eder Claudio Lima,Carlos Hoffmann Sampaio,Caroline Saucier,Silvio Luis Pereira Dias 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.11
Sludge based activated carbons (ACs) were used to remove selected pharmaceuticals such as diclofenac (DCF) and nimesulide (NM) from aqueous solutions. The powered sewage sludge was mixed with different proportions of ZnCl2. The mixture was pyrolyzed in a conventional oven using three different temperatures under inert atmosphere. Afterwards, in order to increase the specific surface area and uptake capacity the carbonized materials were acidified with 6mol L−1 HCl under reflux at 80 oC for 3 hours. The characterization of ACs was achieved by scanning electron microscopy, FTIR, TGA, hydrophobicity index by water, n-heptane vapor adsorption and nitrogen adsorption/ desorption curves. The specific surface area (SBET) of adsorbents varied between 21.2 and 679.3m2g−1. According to the water and n-heptane analysis data all ACs had hydrophobic surface. Experimental variables such as pH, mass of adsorbent and temperature on the adsorption capacities were studied. The optimum pH, mass of adsorbent and temperature for adsorption of DCF and NM onto ACs were found to be 7.0 (DCF) and 10.0 (NM), 30mg and 25 oC, respectively. The kinetic adsorption was investigated using general-order, pseudo-first order and pseudo-second order kinetic models, while the general-order model described the adsorption process most suitably. The maximum amounts of DCF and NM adsorbed were 156.7 and 66.4mg g−1 for sample 1(500-15-0.5), respectively.
Davis Castro dos Santos,Eder Cláudio Lima,Matthew Ayorinde Adebayo,Simone de Fátima Pinheiro Pereira,Lizie Daniela Tentler Prola,Renato Cataluña,Caroline Saucier,Caline Rodrigues Gally,Fernando Machad 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.8
New carbon composite materials were prepared by pyrolysis of mixture of coffee wastes and red mud at700 oC with the inorganic : organic ratios of 1.9 (CC-1.9) and 2.2 (CC-2.2). These adsorbents were used to removereactive orange 16 (RO-16) and reactive red 120 (RR-120) textile dyes from aqueous solution. The CC-1.9 and CC-2.2 materials were characterized using Fourier transform infrared spectroscopy, Nitrogen adsorption/desorption curves,scanning electron Microscopy and X-ray diffraction. The kinetic of adsorption data was fitted by general order kineticmodel. A three-parameter isotherm model, Liu isotherm model, gave the best fit of the equilibrium data (298 to 323 K). The maximum amounts of dyes removed at 323 K were 144.8 (CC-1.9) and 139.5 mg g−1 (CC-2.2) for RO-16 dye and95.76 (CC-1.9) and 93.80 mg g−1 (CC-2.2) for RR-120 dye. Two simulated dyehouse effluents were used to investigatethe application of the adsorbents for effluent treatment.