摘要
研究了水合二氧化锰(δMnO2)的界面特性及其吸附性能.考察了δMnO2的比表面积、粒径分布、表面官能团及ζ电位;探讨了δMnO2对水中亚砷酸盐及腐殖酸的吸附去除效能.结果表明:δMnO2的比表面积为117.4m2·g-1,体积平均粒径为0.11μm;δMnO2表面具有丰富的表面羟基(Mn-OH);随着pH值由1.9升高至10.7,δMnO2的ζ电位由+22.7mV降低至53.5mV,其零电荷点在pH3.0附近.δMnO2对亚砷酸盐(As(III))及腐殖酸(HA)均表现出优良的吸附去除效能,其单位δMnO2质量的最大吸附量分别为137μgAs(III)·mg-1δMnO2和1.01mgTOC·mg-1δMnO2.亚砷酸盐与腐殖酸共存时,腐殖酸的存在使得亚砷酸盐的去除率下降10%—28%;而亚砷酸盐对腐殖酸的去除无明显影响.
The surface chemistry and adsorptive behaviors of δMnO_(2) are investigated in this study. The surface chemistry (BET surface area, particle size distribution, surface functional groups and ζ potential) of δ MnO_(2) and βMnO_(2) are comparatively characterized,and the effectiveness of adsorbing different pollutants(arsenite and humic acid)is subsequently studied. δMnO_(2) shows BET surface area of 117.4 m^(2)·g^(-1) and volume average diameter of 0.11 μm; δMnO_(2) exhibits much surface hydroxyl functional groups (Mn-OH);ζ potential steadily decreases from +22.7 mV to –53.5 mV with pH increasing from 1.9 to 10.7, showing point of zero charge at near pH3.0.δMnO_(2) exhibits good potential of removing arsenite (As(III)) and humic acid (HA) from aqueous solution; the maximal potential of removing pollutants is 137 μg As·mg^(-1)δMnO_(2) for arsenite and 1.01 mg TOC·mg^(-1)δMnO_(2) for humic acid. The presence of humic acid decreases As(III)removal from 10% to 28% whereas As(III)has no obvious adverse effect on HA removal.
出处
《环境化学》
CAS
CSCD
北大核心
2005年第3期338-341,共4页
Environmental Chemistry
基金
国家863计划重大科技专项课题(2002AA601140)
