Adsorption characteristics of cadmium from aqueous solutions by acid-treated oil shale ash
A by-product oil shale ash from Huadian was treated with 5mol/L nitric acid in order to enhance its adsorption capacity. The acid-treated oil shale ash was used as a low cost adsorbent to remove of cadmium from aqueous solutions. The adsorption capacity of samples to remove of cadmium was evaluated by a series of experiments, and the test results indicated that the adsorption capacity was found to increase with increasing the initial concentration of nickel ions solutions, adsorbent dosages, temperature, and pH of solutions. Langmuir adsorption model was used to fit the adsorption isotherms of raw ash and acid-treated ash with R2 of 0.9938 and 0.9954 at 25℃, respectively. When the initial concentration was 100mg/L, the pH was 6.0, the particle size was <75μm, the adsorbent dosage was 15g/L, the agitation speed was 400r/min and the adsorption temperature was 25℃, the uptake values of raw ash and acidtreated ash were 7.78mg/g and 10.53mg/g, respectively.
oil shale ash acid treatment cadmium removal adsorption isotherms
Tong Su Ai-min Li Jing-de Luan
School of Environmental & Biological Science & Technology Dalian University of Technology,Dalian 116024 Dalian,China
国际会议
北京
英文
1-4
2009-06-11（万方平台首次上网日期，不代表论文的发表时间）