摘要
研究了pH、共存离子(Cl-、NO3-、SO24-、F-、HCO3-)和腐植酸对钢渣吸附除磷的影响。结合吸附饱和钢渣上的磷形态分析了产生影响的原因,采用SEM-EDS(扫描电子显微镜-X射线能谱分析)对吸附磷酸盐前后钢渣表面的微观形态特征进行观察。结果表明:钢渣对磷酸盐具有很好的去除效果,吸附饱和钢渣中的磷主要以Ca—P形式存在。钢渣吸附磷酸盐最适初始pH为3～5,高pH抑制Ca—P的生成,对吸附不利。NH4+的存在提高了Ca—P含量,从而促进钢渣对磷酸盐的吸附。共存阴离子Cl-、NO3-、SO24-对钢渣吸附磷酸盐没有影响,但是F-和HCO3-明显抑制Ca—P的生成,从而减少了钢渣对磷酸盐的吸附。腐植酸的存在显著抑制了Ca—P和O—P的生成,使钢渣对磷酸盐的吸附量大大减小。
The effects ofpH, coexisting ions（Cl-, NO3, SO24-, F-, HCO3-）, and humic acid on the adsorption of phosphate by steel slag were studied. The reason of effects of pH and coexisting substances was studied by the morphology analysis of phosphorus on the steel slag. The microstructure of the steel slag before and after adsorption was investigated by SEM-EDS. The results showed that the steel slag had a good effect on the adsorption of phosphate, and the main morphology of phosphate on steel slag was Ca--P. The optimal pH for the adsorption was 3 - 5, while high pH value inhibited the generation of Ca--P and resulted the lower adsorption efficiency. The presence of NH4 ions increased the content of Ca--P and promoted the adsorption of phosphate. C1- , NO3- and SO4^2- ions had no effects on the adsorption. Due to the inhibition of the Ca--P generation by F- and HCO3 , they reduced the adsorption effects of phosphate by steel slag. The existence of humic acid significant- ly inhibited the generation of Ca--P and O--P, and made the capacity of phosphate adsorption reduce greatly.
出处
《环境工程学报》
CAS
CSCD
北大核心
2012年第12期4268-4274,共7页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(50678024)
国家水体污染控制与治理科技重大专项(2008ZX07314-006)
关键词
钢渣
磷酸盐
形态
pH共存物质
steel slag
phosphate
morphology
pH
coexisting substances
