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采用稳态共沉淀法合成了碳酸根插层的镁铁铝三元类水滑石,结合XRD、SEM等对合成样品进行了表征,重点研究了吸附时间、V(Ⅴ)初始浓度、污染液初始p H值等因素对水滑石去除V(Ⅴ)效果的影响。研究结果表明:合成的样品为Mg_(5.216)Fe_(1.456)Al_(1.400)(OH)_(16)(CO_3)_(1.424)·6.40H_2O(即MgFeAl-CO_3LDHs),片状晶体,片长50 nm~400 nm,片厚为15 nm~45 nm;1 g MgFeAl-CO_3LDHs对50m L浓度为45.15 mg/L的V(Ⅴ)污染液去除率为99.84%,且处理后V(Ⅴ)浓度为0.074 mg/L,远远低于钒工业污染物排放标准中最低浓度限0.3 mg/L;对V(Ⅴ)的吸附在热力学上更符合Langmuir方程,计算得饱和吸附量为18.56 mg/g;MgFeAl-CO_3LDHs不适宜在强碱性环境下去除V(Ⅴ)。
Carbonate-intercalated mafic-ternary hydrotalcites were synthesized by steady state coprecipitation. The synthesis samples were characterized by XRD, SEM and so on. The adsorption time, the initial concentration of V (Ⅴ), the initial p Effect of H value and other factors on the effect of removing V (Ⅴ) from hydrotalcite. The results show that the synthesized samples are Mg_ (5.216) Fe_ (1.456) Al_ (1.400) (OH) _ (16) (CO_3) _ (1.424) · 6.40H_2O (ie, MgFeAl-CO_3LDHs) The results showed that the removal rate of V (Ⅴ) in the 50 mg L-1 concentration of 45.15 mg / L was 99.84% with 1 g MgFeAl-CO_3LDHs and the V (Ⅴ) concentration Was 0.074 mg / L, which was much lower than the lowest concentration of 0.3 mg / L in the standard of vanadium industrial pollutants. The adsorption of V (V) was more thermodynamically compatible with Langmuir equation and the saturated adsorption capacity was 18.56 mg / g ; MgFeAl-CO_3LDHs is not suitable for removal of V (V) under strong alkaline conditions.