改性废弃生物质对直接染料的吸附研究

选取花生壳、甘蔗渣和蛋壳膜等废弃物为原料,改性后制得生物质吸附剂,以直接蓝染料废水为处理对象,考察改性前后的吸附效果以及pH、吸附时间、吸附剂投加量等因素对吸附效果的影响,探讨了3种吸附剂的等温吸附和吸附动力学过程.研究表明,改性能够不同程度地提高3种吸附剂的吸附效果,pH和温度对吸附的影响较大,改性花生壳、甘蔗渣以及蛋壳膜在各自投加量条件下对染料废水的脱色率分别达到93.6％、97.4％和99.2％,平衡吸附量可达39,4mg/g、45.5mg/g及113mg/g,等温吸附过程遵从Langmuir方程,吸附动力学符合二级动力学模型.

Absorption of Direct Dyes on Modified Waste Biomass Adsorbents

Peanut shell,bagasse and eggshell membrane were chosen as materials to make biomass adsorbents used in treatment of direct dyes wastewater.The effects of modification,pH value,adsorbents dosage,temperature on adsorption performance were investigated.The isothermal adsorption process and adsorption kinetics of three kinds of adsorbents were also discussed.It showed that the modification could in different degree enhance the adsorption effect of these adsorbents,and pH value and temperature had great effects on the adsorption.Under the conditions of their dosage,the decolorization rates of dye wastewater by modified peanut shell,bagasse and eggshell membrane reached 93.6％,97.4％ and 99.2％,and the equilibrium adsorption capacity reached 39.4mg/g,45.5mg/g and 113mg/g respectively.The results showed the isothermal adsorption process obeyed the Langmuir equation and the adsorption kinetics was consistent with the two order kinetic model.