粉煤灰表面无机改性与吸附Cu(Ⅱ)实验  

An experimental study on inorganic modification of fly ash surface and adsorption of heavy metal Cu(Ⅱ)by modified fly ash

作　　者：苏晓斌 SU Xiao-bin(Natural Resources Management Bureau of Zhuanglang County,Pingliang 744699,China)

机构地区：[1]庄浪县自然资源局,甘肃平凉744699

出　　处：《矿物学报》2023年第3期389-396,共8页Acta Mineralogica Sinica

摘　　要：以燃煤电厂中的粉煤灰为载体,采用水浴加热法将氢氧化镁负载在粉煤灰表面制备成复合粉体而应用于吸附矿山地质灾害发生后水溶液中的铜离子。通过扫描电镜加自带EDS能谱、比表面积分析仪、X射线衍射、红外光谱等技术对改性后的粉煤灰进行了表征。结果表明,改性后粉煤灰明显具有H3型滞回线,表明改性粉煤灰具有丰富的介孔,具体表现为平均孔容从0.005 m^(3)/g增加至0.035m^(3)/g,平均孔径由10.23nm增加至13.52nm,孔隙宽度从11.36nm增加至14.05nm,比表面积由原来粉煤灰1.09m^(2)/g增加至35.31m^(2)/g。改性后复合粉体去除Cu(Ⅱ)的效率明显高于粉煤灰。复合粉体材料对Cu(Ⅱ)吸附主要通过静电吸引、沉淀反应等方式进行。In this paper,the fly ash from coal-fired power plants is used as carrier and magnesium hydroxide is loaded on the surface of fly ash by using the water bath heating method to prepare composite powder,which can be used to absorb copper ions in aqueous solution after geological disasters in mines.The modified fly ash has been characterized by using SEM,EDS,BET,XRD and FTIR methods.The results show that the modified fly ash obviously has a H3 type of hysteretic loop,indicating that the modified fly ash has abundant mesoporous.Comparison of the original and modified fly ashes indicates that the average pore volume is increased from 0.005 m^(3)/g to 0.035 m^(3)/g,the average pore size is increased from 10.23 nm to 13.52 nm,the pore width is increased from 11.36 nm to 14.05 nm,and the specific surface area is increased from 1.09 m^(2)/g to 35.31 m^(2)/g.The removal capability of Cu(Ⅱ)adsorbed by the composite powder material(the modified fly ash)is obviously higher than that of the original fly ash.The Cu(II)adsorption of the composite powder material is mainly carried out by electrostatic attraction and precipitation reaction.

关 键 词：粉煤灰 氢氧化镁 复合粉体 吸附 

分 类 号：P579[天文地球—矿物学] X37[天文地球—地质学]