摘要
采用水热法合成纳米花状的β-CrOOH,并用于钒(V^(5+))的吸附分离。在碱性体系中,合成的β-CrOOH比表面积为174.882 m^2/g,孔体积为0.602 cm^3/g。在65℃、pH=4时,β-CrOOH对V^(5+)的最大吸附容量可达到32.66mg/g。吸附机理表明,β-CrOOH在吸附过程中其表面会释放出羟基以形成配位不饱和Cr^(6+)活性中心,溶液中的钒酸根(VO_4^(3+))单体通过钒氧双键(V=O)与不饱和的Cr^(6+)活性中心结合,形成内球型配位,从而吸附钒。在铬酸盐的清洁生产应用中,将β-CrOOH置于铬铁矿无钙焙烧中和液(Na_2CrO_4-NaVO_3-H_2O)中用来选择性分离V^(5+)离子。结果表明,适量的β-CrOOH能将铬中和液中91.57%的钒有效脱除掉,铬几乎无吸附,从而实现钒铬的有效分离。
A guyanaite（β-CrOOH） with nanometer flower morphology synthesised by hydrothermal precipitation method and vanadate（V-（5＋）） ion adsorption on the β-CrOOH were investigated. In the alkaline system, the synthetic specific surface area of the β-CrOOH is 174.882 m-2/g, the pore volum is 0.602 cm-3/g. The β-CrOOH possesses the maximum V-（5＋）ion adsorption capacity of 32.66 mg/g with pH=4 at 65 ℃. The adsorption mechanism results show that the β-CrOOH liberated surface hydroxyls to form coordinatively unsaturated Cr-（6＋） centres, which further adsorbs V-（5＋） ions through connecting mono-oxo, V=O terminal double bonds with oxygen of the Cr-（6＋） centres. In the cleaner production application of chromate, the β-CrOOH is placed in the Na2CrO4--NaVO3--H2O solutions to selectively adsorb the V-（5＋） ions, and 91.57% vanadium could be effectivly removed and Cr-（6＋） is rarely adsorbed, realizing effective separation of vanadium and chromium.
作者
陈欣
郑诗礼
张海林
崔雯雯
王舒磊
李平
张懿
CHEN Xin1,2, ZHENG Shi-li2, ZHANG Hai-lin2, CUI Wen-wen2, WANG Shu-lei2, LI Ping2, ZHANG Yi1,2(1. National Engineering Research Center of Distillation Technology, School of Chemical Engineering, Tianjin University, Tianjin 300350, China; 2. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, Chin)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2018年第4期845-854,共10页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(51574212
U1403195)~~
关键词
羟基氧化铬
分离
铬酸盐溶液
钒
水热法
选择性吸附
β-CrOOH
separation
chromate solution
vanadium
hydrothermal method
selective adsorption
