Al-Mn氧化物对废水中氟的去除

Fluoride Adsorption by Al-Mn Oxide from Wastewater

采用共沉淀法制备Al-Mn氧化物吸附剂,并用场发射扫描电子显微镜(FESEM)、X射线衍射仪(XRD)、Zeta电位仪对产物进行表征,考察了吸附剂用量、温度、pH和共存离子(Cl^(-)、CO_(3)^(2-)、NO_(3)^(-)、SO_(4)^(2-)和H_(2)PO_(4)^(-))对吸附剂去除水中氟的影响。结果表明:相对于其他条件,吸附剂在初始溶液p H=3~11,F^(-)初始质量浓度为10 mg·L^(-1)且吸附剂含量为1.5 g·L^(-1)时,去除效果最佳;吸附平衡时间为2 h;吸附动力学满足准二级动力学模型(P<0.0001);热力学满足Langmuir和Freundlich模型;通过计算得吸附剂对F^(-)最大吸附量为37.7 mg·g^(-1)(pH=7)和56.1 mg·g^(-1)(pH=3);共存离子对吸附剂去除F^(-)的影响次序为CO_(3)^(2-)>H_(2)PO_(4)^(-)>SO_(4)^(2-)>NO_(3)^(-)=Cl^(-)。

A aluminum-manganese oxide adsorbent was fabricated via co-precipitation process,and the product was characterized by field emission scanning electron microscope(FESEM),X-ray diffraction(XRD),and Zeta potentiometer.The effects of adsorbent amount,temperature,pH and coexisting ions(Cl^(-),CO_(3)^(2-),NO_(3)^(-),SO_(4)^(2-),and H_(2)PO_(4)^(-))on the removal of fluoride from wastewater by the adsorbent were investigated.The results show that,compared with other conditions,in the case of the initial solution pH raging in 3~11,the F^(-)concentration of 10 mg·L^(-1) and the adsorbent content of 1.5 g·L^(-1),the removal efficiency is the best atadsorption equilibrium time of 2 h,and the adsorption kinetic data is well fitted by the pseudo second order model.Moreover,the Langmuir and Freundlich models are suitable for describing adsorption behavior and the maximum adsorption capacity for F^(-)is 37.7 mg·g^(-1)(pH=7)and 56.1 mg·g^(-1)(pH=3).The effects of coexisting anions on the removal of F^(-)in the order of:CO_(3)^(2-)>H_(2)PO_(4)^(-)>SO_(4)^(2-)>NO_(3)^(-)=Cl^(-).