高值化利用含Sb(Ⅲ)废水制备Fe3O4/Sb2O4@C复合材料及其性能研究

采用液相还原法制备纳米零价铁(nZVI),以其吸附废水中的Sb(Ⅲ),得到nZVI/Sb颗粒; 将其在500 ℃下氧气煅烧8 h,制得Fe₃O₄/Sb₂O₄材料; 再以葡萄糖为碳源、600 ℃氮气热处理,制备了Fe₃O₄/Sb₂O₄@C复合材料,并对其性能进行了研究。结果表明,nZVI吸附含Sb(Ⅲ)废水的适宜条件为:中性溶液Sb(Ⅲ)初始浓度100 mg/L,nZVI投加量1.2 g/L,室温下吸附50 min,该条件下废水中Sb(Ⅲ)去除率为73%; 引入Sb₂O₄后,铁基负极的首次放电比容量高达1065.6 mAh/g; 包覆碳后,Fe₃O₄/Sb₂O₄@C复合材料电化学性能明显改善,100 mA/g电流密度下,循环150圈后放电比容量仍可保持在483.7 mAh/g,电流密度2000 mA/g时,放电比容量仍有118.2 mAh/g。     

Characterization of polysulfone hollow-fiber ultrafiltration membrane and its cleaning efficiency by streaming potential and flux method

Polysulfone (PS) hollow-fiber ultrafiltration membrane was characterized combined with flux and streaming potential in single electrolyte solutions. The effects of trans-membrane pressure, electrolyte concentration, ion valence and pH value of electrolyte solution on the streaming potential (SP) of the membrane were investigated. The zeta potential and surface charge density of the membrane were calculated on the basis of Helmholtz-Smoluchowski equation and Gouy-Chapmann theory. The results indicate that the valence and concentration of cation have a greater influence on the SP and surface charge density of PS membrane than those of anion, and the pH value of electrolyte solution has great effects on the SP and zeta potential of the membrane surface. Both the absolute value of the streaming potential and water flux of the adsorbed membrane decrease, compared with those of the clean membrane. The streaming potential and flux of the cleaned membrane can be completely recovered by cleaning with the mass fraction of 0.8% EDTA at pH=10. Foundation item: Project(20776161) supported by the National Natural Science Foundation of China