【摘要】 采用共沉淀法制备了新型Ti-Fe复合氢氧化物吸附剂,并对其表面特性及除砷性能进行了初步研究。比表面和孔隙测试结果表明:2种Ti-Fe复合氢氧化物TF和TM的比表面积分别为148.6,147.6 m2/g,平均孔径分别为6.2,6.5 nm。Lagergren二级吸附动力学模型,可以很好地描述Ti-Fe复合氢氧化物吸附去除As(Ⅲ)的动力学过程。Freundlich和Langmuir方程均能较好地描述Ti-Fe复合氢氧化物吸附As(Ⅲ)的过程,而且Freundlich方程的拟合效果更好(R2>0.96);TF和TM对As(Ⅲ)的饱和吸附容量分别达到76.92,38.76 mg/g。当PO34-浓度小于2 mmol/L时,TF和TM对As(Ⅲ)的去除率分别可以达到空白样的90%和80%以上;浓度为10 mmol/L时,去除率也可分别达到60%和55%。Ti-Fe复合氢氧化物能够有效减轻PO34-对吸附性能的抑制。更多还原

【Abstract】 Ti-Fe hydroxide complexes,a novel adsorbent for arsenic removal,were synthesized by a low-cost co-precipitation process.The characteristics and adsorption properties of the adsorbent were studied in detail.The experimental results indicate that the specific surface area of TF and TM was 148.6 and 147.6 m2/g respectively,the pore size of TF and TM was 6.2 and 6.5 nm respectively.The Ti-Fe composite hydroxide adsorption of As(Ⅲ)could be well described by the Lagergren Pseudo-second order model.The adsorption isotherm were well described by the Freundlich and Langmuir equation,Freundlich equation was found to fit well with arsenited adsorption(R2>0.96);The maximal adsorption capacities of TF and TM for arsenite were 76.92 mg/g and 38.76 mg/g respectively.When PO3-4concentration was less than 2 mmol/L,the removal rates of TF and TM were up to 90% and 80% or more of blank sample respectively;When the concentration was 10mmol/L,the removal rates of TF and TM were 60% and 55%.Ti-Fe composite hydroxide could effectively reduce the inhibition of PO3-4 on adsorption.更多还原