马尾松针和柚子皮吸附亚甲基蓝和刚果红的研究

ADSORPTION OF METHYLENE BLUE AND CONGO RED BY MASSON PINE NEEDLES AND POMELO PEELS

采用废弃的马尾松针和柚子皮材料,对水中的染料进行吸附,研究了马尾松针对亚甲基蓝（MB）、柚子皮对刚果红（CR）的吸附效果。结果表明,减小马尾松针、柚子皮的粒径有助于提高其对染料的吸附效率;对于质量浓度100 mg/L的MB和CR,马尾松针和柚子皮的适宜投加量分别为0.8、8.0 g/L,吸附平衡时间分别为180、120 min;2种生物质对染料的吸附都是吸热反应,温度对吸附效果的影响较小;染液起始p H对马尾松针吸附MB的影响较大,对柚子皮吸附CR的影响较小;在p H为5~10时,马尾松针对MB的去除率保持在80%以上,增大染液p H会增加吸附效果;在p H为3~10时,柚子皮对CR的吸附率都能保持在85%以上;Na Cl的加入会抑制MB在马尾松针上的吸附,增加CR在柚子皮上的吸附。MB在马尾松针上、CR在柚子皮上的吸附平衡数据符合Langmuir模型,2种生物质对染料的吸附均以化学吸附为主。

The waste masson pine needles and pomelo peels were used to remove Methylene blue （MB） and Congo red （CR） from aqueous solutions, respectively. The main results were as follows： The decolorizing rates of dyes could be improved by reducing the particle sizes of masson pine needles and pomelo peels. The respective optimum adsorbent dosages for 100 mg/L MB and CR were 0.8 g/L masson pine needles and 8.0 g/L pomelo peels under experimental conditions. With the optimum adsorbent dosages, the adsorption equilibrium times were 180 min and 120 min, respectively. The dyes adsorption by masson pine needles and pomelo peels was endothermic, and the adsorption temperature had little impact on the final adsorption efficiency; MB adsorption by masson pine needles was affected obvinusly by the initial pH values of dyes solutinn, whereas CR adsorption by pomelo peels was affected little by this factor. The decolorizing rate of MB by masson pine needles remained above 80% and improved with the increase ofpH within the range of 5-10. The decolorizing rate of CR by pomelo peels remained about 85% within the pH range of3-10. MB adsorption by masson pine needles was suppressed by the addition of NaCl which would increase CR adsorption by pomelo peels. The adsorption equilibrium data on MB adsorption by masson pine needles and CR adsorption by pomelo peels were fitted with the well-defined Langmuir model. MB and CR adsorption by the two biomatefials was mainly a chemical adsorption process.