Assessment of the Sorption Characteristics of Cadmium onto Steel-making Slag in Simulated Sea Water Using Batch Experiment

Abstract

Steel-making slag was investigated as reactive material for removal of cadmium in coastal area. Batch experiments of the sorption isotherm experiment and kinetic sorption experiment were performed. Result of sorption isotherm was more adequately described by Langmuir model than Freundlich model and theoretical maximum capacity (β) of cadmium onto steel-making slag was found. Results of kinetic sorption experiments were evaluated by pseudo second order model to investigate sorption characteristics of cadmium onto steel-making slag. Results showed that the equilibrium sorption amount of cadmium (q e ) increased and the rate constant (k 2 ) and initial sorption rate (h) decreased as the initial cadmium concentration increased. The q e with simulated sea water was similar to that with deionized water and k 2 and h with simulated sea water was lower than those with deionized water. Results of kinetic experiments could be used to predict the result from sorption isotherm, since equilibrium sorption amounts calculated by pseudo second order model generally agreed with those measured from sorption isotherm. The reaction time for the target removal rate could be calculated by the pseudo second order model using kinetic sorption tests results.

Assessment of the Adsorption Capacity of Cadmium and Arsenic onto Paper Mill Sludge Using Batch Experiment

“…제지슬러지가 pH 8의 약 알칼리성을 띄는 이유는 제지슬 러지의 구성 성분 중 CaO, MgO, K 2 O의 함유량이 11% 가량 차지하고 있기 때문으로 판단된다. 일반적으로 pH가 증가하면 수소이온과의 경쟁 효과가 줄어들고 반응물질의 표면에 음전하를 띠는 공간이 증가하게 되는데, 이로 인해 침전의 효과로 카드뮴의 제거효율이 증가한다고 보고되어 있다(Kim et al, 2011). 제지슬러지의 Cation exchange capacity(CEC)은 17.86 cmol/kg으로, 이는 Kim et al…”

Removal of Aqueous Arsenic Via Adsorption onto Si Slag

“…(Kwon and Kim, 1999;Shin et al, 2003;Jung, 2005;Keiko et al, 2008;Oh et al, 2010;Kim et al, 2011 (Bothe and Brown 1999;Palfy et al, 1999;Roman-Ross et al, 2006;Singh and Pant, 2006;Son et al, 2009;Lee and Jeon, 2010 (Stumm, 1992;Lee et al, 1993;Kraepiel et al, 1998;Singh and Uehara, 1998;Jain et al, 1999). (2000) Kim et al …”