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采用水热法成功合成四方纤铁矿(β-FeOOH),并结合XRD、SEM、zeta电位分析等对合成物进行系列表征。重点考察Cr(Ⅵ)初始浓度、pH值以及不同光照条件等因素下,β-FeOOH对Cr(Ⅵ)去除效果的影响。实验结果表明:合成得到的β-FeOOH为纺锤形晶体,长径200nm~250nm,端面直径30nm~50nm。Cr(Ⅵ)初始浓度、pH值以及光照条件对β-FeOOH去除Cr(Ⅵ)均存在重要影响。随着Cr(Ⅵ)初始浓度的升高,β-FeOOH吸附Cr(Ⅵ)量呈先递增后降低的趋势,当Cr(Ⅵ)初始浓度为50.07 mg/L时,β-FeOOH吸附Cr(Ⅵ)量达到最大值12.05mg/g,且吸附特征符合Langmuir方程吸附模型,饱和吸附量为16.35mg/g;β-FeOOH宜在弱酸性环境下去除Cr(Ⅵ),随着污染液pH的升高,β-FeOOH对Cr(Ⅵ)去除率呈现先增加后减小的趋势,在pH为6.24时去除率达到最大,为96.67%;光照条件会影响β-FeOOH对Cr(Ⅵ)的去除,β-FeOOH对Cr(Ⅵ)的去除效率呈现出黑暗环境>自然环境>紫外光照射。
The hydrothermal method was used to synthesizeβ-FeOOH. The XRD, SEM and zeta potential analyzes were used to characterize the composites. The effect of β-FeOOH on the removal of Cr (Ⅵ) was investigated with the initial concentration of Cr (Ⅵ), pH value and different light conditions. The experimental results show that the synthesized β-FeOOH is a spindle-shaped crystal with a long diameter of 200 nm to 250 nm and an end face diameter of 30 nm to 50 nm. The initial concentration of Cr (Ⅵ), pH value and illumination conditions have important influence on the removal of Cr (Ⅵ) by β-FeOOH. With the increase of initial Cr (Ⅵ) concentration, the amount of Cr (Ⅵ) adsorbed by β-FeOOH increased first and then decreased. When the initial Cr (Ⅵ) concentration was 50.07 mg / L, ) Reached the maximum value of 12.05mg / g, and the adsorption characteristics accorded with the Langmuir equation adsorption model, the saturated adsorption capacity was 16.35mg / g; β-FeOOH should remove Cr (Ⅵ) in weak acid environment, The removal rate of Cr (¢ ö) increased firstly and then decreased with the increase of β-FeOOH. The removal rate of Cr (¢ ö) reached 96.67% at pH 6.24, The removal efficiency of Cr (Ⅵ) by β-FeOOH shows dark environment> natural environment> ultraviolet light.