论文部分内容阅读
为研究改性竹炭对溶液中Cr(Ⅵ)的吸附性能,考察了pH值、吸附时间、溶液初始浓度和改性竹炭用量对吸附性能的影响.结果表明,当溶液呈强酸性时,竹炭和改性竹炭均有很好的吸附效果;溶液呈弱酸性时,竹炭几乎不吸附;而改性竹炭却有较好的吸附性能,且经1000℃高温煅烧和氧化改性后的竹炭的吸附效果最佳.溶液初始浓度减小,改性竹炭用量增大,吸附率增大.当Cr(Ⅵ)初始质量浓度为40 mg/L时,其饱和吸附量约为5 mg/g,吸附平衡时间约为48 h.采用一级、二级吸附速率方程对吸附能力的影响进行拟合,表明二级吸附动力学比一级吸附动力学更符合改性竹炭的动态吸附过程.
In order to study the adsorption properties of modified bamboo charcoal on Cr (Ⅵ) in solution, the effects of pH value, adsorption time, initial concentration of solution and amount of modified bamboo charcoal on adsorption performance were investigated. The results showed that when the solution was strongly acidic, Modified bamboo charcoal has a good adsorption effect; when the solution is weakly acidic, almost no adsorption of bamboo charcoal; and modified bamboo charcoal has better adsorption properties, and after 1000 ℃ high temperature calcination and oxidation modified bamboo charcoal adsorption effect The initial concentration of solution decreased, the amount of modified bamboo charcoal increased, the adsorption rate increased.When the initial concentration of Cr (Ⅵ) was 40 mg / L, the saturated adsorption capacity was about 5 mg / g, the adsorption equilibrium time About 48 h.Adopting the first and second adsorption rate equations to fit the adsorption capacity, it shows that the second-order adsorption kinetics is better than the first-order adsorption kinetics in the dynamic adsorption process of the modified bamboo charcoal.