水厂反冲洗铁锰泥热处理产物结构及除砷变化
发布时间:2018-07-05 11:32
本文选题:铁锰氧化物 + 反冲洗泥 ; 参考:《中国环境科学》2017年08期
【摘要】:利用X射线粉末衍射(XRD)、透射电子显微镜(TEM)、差热重量分析法(TG)、比表面积分析仪(BET)等研究了除铁除锰水厂富含铁锰氧化物的反冲洗泥经过不同焙烧温度处理后的产物结构变化对吸附除砷的影响.结果表明:铁锰氧化物反冲洗泥原料为无定型结构,粒径小且比表面积大,能高效除砷;焙烧温度为150℃时,结晶水开始脱除,比表面积与孔容变化不大,As(Ⅲ)和As(V)的去除率均略微增加;焙烧温度为500℃时,脱羟基反应促使微孔逐渐合并成介孔,比表面积降低,As(Ⅲ)和As(V)的去除率降至70%;当焙烧温度升高到800℃后,热处理产物脱水完全,微孔和介孔随焙烧温度升高逐渐合并成大孔,比表面积和孔容分别下降至12.755m2/g和0.052cm3/g,平均孔径增长了约10nm,且产生的赤铁矿晶体颗粒间出现烧结现象,对As(Ⅲ)和As(V)的去除率大幅下降,为原来的10%左右.
[Abstract]:By means of X-ray powder diffraction (XRD), transmission electron microscope (TEM), differential thermogravimetry (TG) and specific surface area analyzer (BET), the products of iron-removal water plant with rich iron and manganese oxides were studied after different calcination temperature. Effects of structural changes on adsorption and removal of arsenic. The results show that the raw material of iron-manganese oxide backwash mud is amorphous structure, the particle size is small and the specific surface area is large, it can remove arsenic efficiently, and when the calcination temperature is 150 鈩,
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