摘要
用氢氧化钠溶液对粉煤灰进行碱溶处理,并通过粉末X射线衍射光谱(XRD)和扫描电子显微镜(SEM)对碱溶前后粉煤灰的物质组成和形貌进行表征,研究了粉煤灰和碱溶粉煤灰对废水中六价铬(Cr6+)的吸附性能。试验结果表明:碱溶粉煤灰结构松散,同时含有大量沸石分子筛的晶体结构;碱溶粉煤灰对废水中Cr6+吸附容量大于普通粉煤灰,在碱溶粉煤灰质量浓度为15g/L,反应时间30min,pH值为5～6,反应温度在25～35℃时,碱溶粉煤灰对质量浓度50mg/L的含Cr6+废水去除率可达88.56%,其吸附模型符合Langmuir模型,最大吸附容量达23.59mg/g,吸附强度为0.0435L/mg。碱溶粉煤灰对废水中Cr6+的吸附是粉煤灰组分和新生的沸石分子筛组分共同作用的结果。
The sodium hydroxide solution was applied to the soda dissolved treatment of the fly ash.The powder X-ray Diffraction Spectrum（XRD） and Scanning Electron Microscope（SEM） were applied to characterize the material compositions and shape of the fly ash before and after the alkaline dissolved.The paper had a study on the adsorption performances of the fly ash and alkaline dissolved fly ash to the hexavalent chromium（Cr6 ＋） in the waste water.The experiment results showed that the structure of the alkaline dissolved fly ash would be soft and scattered and the alkaline dissolved fly ash would have the crystal structures with great zeolite molecular sieves.The alkaline dissolved fly ash would have an adsorption volume of the Cr6 ＋ in the waste water higher than the fly ash.When the quality density of the alkaline dissolved fly ash was 15 g/L,the reaction time was 30 min,pH value was 5 ～ 6 and the reaction temperature was 25 !35 ℃,the alkaline dissolved fly ash could have a hexavalent chromium（Cr6 ＋） removing rate of the Cr6 ＋ waste water with a quality density of 50 mg/L.The adsorption model could fit the Langmuir model,the max adsorption volume could reach to 23.59 mg/g and the adsorption strength would be 0.043 5 L/mg.The Cr6 ＋ adsorption of the alkaline dissolved fly ash from the waste water was the joint function results of the fly ash components and the new zeolite molecular sieve components.
出处
《煤炭科学技术》
CAS
北大核心
2010年第10期124-128,共5页
Coal Science and Technology
基金
淮海工学院自然科学基金资助项目(Z2009023)
关键词
粉煤灰
碱溶粉煤灰
沸石分子筛
六价铬
吸附
废水
吸附模型
吸附容量
吸附机理
fly ash
dissolved alkaline fly ash
zeolite molecular sieve
Cr6＋
adsorption
adsorption model
waste water
adsorption volum
adsorption mechanism
