针铁矿及其热活化产物除Sb(Ⅲ)效果对比  

Comparison of efficiencies of Sb(Ⅲ) removal by goethite and its thermally activated products

作　　者：罗海翠 周跃飞[1] 皮汇钰 杨建明 谢巧勤[1] 陈天虎[1] LUO Hai-cui;ZHOU Yue-fei;PI Hui-yu;YANG Jian-ming;XIE Qiao-qin;CHEN Tian-hu(Key Laboratory of Nanominerals and Pollution Control of Anhui Higher Education Institutes,School of Resources&Environmental Engineering,Hefei University of Technology,Hefei 230009,China;Zhejiang Huayuan Pigment Co.,Ltd.,Deqing 313220,China)

机构地区：[1]合肥工业大学资源与环境工程学院,纳米矿物与污染控制安徽普通高校重点实验室,安徽合肥230009 [2]浙江华源颜料股份有限公司,浙江德清313220

出　　处：《矿物学报》2021年第6期697-703,共7页Acta Mineralogica Sinica

基　　金：国家自然科学基金项目(编号:41872043)。

摘　　要：以合成针铁矿为原料,通过煅烧法获得比表面积分别为85.74和22.65 m^(2)/g的多孔纳米赤铁矿和磁赤铁矿,通过静态实验探究了针铁矿和煅烧产物的Sb(Ⅲ)吸附性能。结果表明,Sb(Ⅲ)吸附效率为赤铁矿>磁赤铁矿>针铁矿,其前二者效率显著高于针铁矿。Sb(Ⅲ)在3种矿物表面的吸附均为快速的化学吸附,吸附在2 h内即可接近平衡,符合准二级动力学反应和Freundlich等温吸附模型,为自发进行的吸热反应,升高温度有利于反应的进行。在45℃、pH=7的条件下,针铁矿、赤铁矿和磁赤铁矿的最大吸附量分别可达16.04、50.44和33.53 mg/g。pH对赤铁矿和磁赤铁矿的Sb(Ⅲ)吸附效率影响不大,但pH升高会导致针铁矿的吸附能力降低。CO_(3)^(2-)、SiO_(4)^(4-)、PO_(4)^(3-)和胡敏酸会与Sb(Ⅲ)竞争吸附位,抑制3种矿物对Sb(Ⅲ)的吸附,但这种抑制作用只在阴离子浓度较高的条件下有效。研究认为磁赤铁矿具有更多的表面活性位和较强的磁回收能力,是优于针铁矿和赤铁矿的含Sb(Ⅲ)废水处理材料。Nanosized and porous hematite and maghemite, which have respective specific surface areas of 85.74 m^(2)/g and 22.65 m^(2)/g, were prepared through calcination of synthetic goethite in order to explore their adsorption efficiencies of Sb(Ⅲ) through static experiments. Results show that the adsorption efficiencies of Sb(Ⅲ) of hematite, maghemite, and goethite are subsequently decreased. Especially, those of hematite and maghemite are obviously higher than that of goethite. The adsorption of Sb(Ⅲ) on surfaces of 3 kinds of minerals is a rapid chemical process, in which the adsorption equilibrium can almost be reached within 2 hours. It accords with the pseudo-second-order adsorption kinetic reaction model and the Freundlich isothermal adsorption model. It is a spontaneous endothermic reaction which is beneficially facilitated by the increase of temperature. The saturated adsorption capacities for the goethite, hematite, and maghemite at 45℃ and pH value of 7.0 are 16.04, 50.44, and 33.53 mg/g, respectively. The pH value of solution has little effect on the adsorption efficiencies of Sb(Ⅲ) by hematite and maghemite. However, the increase of ph value of solution will result in the decrease of the adsorption efficiency of Sb(Ⅲ) by goethite. Anions of CO_(3)^(2-), SiO_(4)^(4-), PO_(4)^(3-), and humic acids will restrain the Sb(Ⅲ) adsorption by the hematite, maghemite, and goethite through the competition of adsorption sites with Sb(Ⅲ), though such restraint is efficient only under high anion concentration condition. It is considered that maghemite is a better material than goethite and hematite for treating Sb(Ⅲ)-bearing waste water because it has much more surface active sites and stronger magnetic recovery ability than others.

关 键 词：针铁矿 赤铁矿 磁赤铁矿 Sb(Ⅲ) 吸附 

分 类 号：P579[天文地球—矿物学]