화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.33, No.11, 3149-3161, November, 2016
DOI10.1007/s11814-016-0194-3  Export Citation
Activated carbon from sewage sludge for removal of sodium diclofenac and nimesulide from aqueous solutions
Glaydson Simões dos Reis1, 2, †, Mohammad Khalid Bin Mahbub2, Michaela Wilhelm2, Eder Claudio Lima3, Carlos Hoffmann Sampaio1, Caroline Saucier3, and Silvio Luis Pereira Dias3
  • 1Department of Metallurgical Engineering, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, Porto Alegre, RS, Brazil
  • 2University of Bremen, Advanced Ceramics, Am Biologischen Garten 2, IW3, 28359 Bremen, Germany
  • 3Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, Postal Box 15003, ZIP 91501-970, Porto Alegre, RS, Brazil
E-mail:
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 ℃ 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 ℃, 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.
Keywords:Sewage Sludge;Activated Carbons;Adsorption of Pharmaceuticals;Water and n-Heptane Adsorptions;Adsorption Mechanism
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