Şencan Aziz, Karaboyacı Mustafa, Kılıç Mehmet
Department of Chemical Engineering, Süleyman Demirel University, 32260, Isparta, Turkey,
Environ Sci Pollut Res Int. 2015 Mar;22(5):3238-48. doi: 10.1007/s11356-014-2974-9. Epub 2014 May 8.
This study aimed to determine the Pb(+2) adsorption capacities of hazelnut shell and activated carbon obtained from hazelnut shell. It also aimed to determine the effect of ZnCl2 in the activation process. The hazelnut was pyrolyzed at 250 and 700 °C. For determining the capture speed of the adsorbents, the pseudo-first- and second-order kinetic studies were performed. The Freundlich and Langmuir isotherm models were used to determine adsorption equilibrium. The surface characterization of hazelnut shell and activated carbon was determined by Brunauer-Emmett-Teller (BET) analysis and FTIR spectrum. Pb(+2) adsorption capacity of obtaining activated carbon was determined by ICP-OES analysis. The raw hazelnut shell's BET surface area is 5.92 m(2)/g and the surface area of activated carbons which is pyrolyzed at 250 and 700 °C were determined (270.2 and 686.7 m(2)/g, respectively. The surface area of hazelnut shell, which pyrolyzed at 700 °C after being activated with ZnCl2, was determined to be 736.49 m(2)/g. Results show that physical adsorption process is dominant for the activated carbon pyrolysis at 700 °C but the chemical adsorption is dominant for the activated carbon pyrolysis at lower degrees and for raw hazelnut shell.
本研究旨在测定榛子壳及由榛子壳制得的活性炭对Pb(+2)的吸附容量。它还旨在确定ZnCl2在活化过程中的作用。榛子在250和700℃下进行热解。为了测定吸附剂的捕获速度，进行了准一级和二级动力学研究。采用Freundlich和Langmuir等温线模型来确定吸附平衡。通过Brunauer-Emmett-Teller（BET）分析和FTIR光谱对榛子壳和活性炭进行表面表征。通过ICP-OES分析测定所制得活性炭对Pb(+2)的吸附容量。未加工榛子壳的BET表面积为5.92 m²/g，测定了在250和700℃下热解的活性炭的表面积（分别为270.2和686.7 m²/g）。在用ZnCl2活化后于700℃下热解的榛子壳的表面积测定为736.49 m²/g。结果表明，在700℃下热解的活性炭以物理吸附过程为主，但在较低温度下热解的活性炭以及未加工的榛子壳以化学吸附为主。
