摘要
采用生物质基的栲胶为催化剂,催化空气氧化硫代亚锑酸钠(简称Sb(Ⅲ))溶液制备焦锑酸钠,考察温度、初始Sb(Ⅲ)浓度、氧化栲胶(简称TEOS)浓度和空气流量等因素对氧化过程Sb(Ⅲ)转化率的影响。结果表明:温度升高、初始Sb(Ⅲ)浓度降低有利于提高Sb(Ⅲ)转化率,而随TEOS浓度增加与空气流量增大Sb(Ⅲ)转化率先增后降。基于单因素法研究获得的适宜氧化条件为温度90℃、初始Sb(Ⅲ)浓度1.2×10-2mol/L、TEOS浓度8.0g/L、空气流量8.0L/min、反应时间6.0h,在此条件下Sb(Ⅲ)的转化率为97.8%。采用XRD、EDS、SEM对其产物进行表征的分析表明:产物为NaSb(OH)6(即焦锑酸钠)、其结晶度为99.62%,产物中S元素杂质质量分数低至0.23%;产物微粒的粒径约为100nm,其形貌呈米粒状。
Using bio-based tannin extracts(TEOS) as catalyst, sodium pyroantimonate was prepared by catalytic air oxidation of sodium thiosulfate(Sb(Ⅲ)) solution, and the effects of temperature, initial concentrations of Sb(Ⅲ) and TEOS, and air flow on the conversion of Sb(Ⅲ) in the oxidation process were investigated. The results showed that the increase of temperature and the decrease of initial Sb(Ⅲ) concentration were beneficial to the increase of Sb(Ⅲ) conversion, while with the increase of TEOS concentration and air flow, Sb(Ⅲ) conversion increased first and then decreased. The optimum oxidation conditions determined by the single factor experiments were as follows: temperature of 90°C, initial Sb(Ⅲ) concentration of 1.2×10-2 mol/L, TEOS concentration of 8.0 g/L, air flow of 8.0 L/min and reaction time of 6.0 h, under which the conversion of Sb(Ⅲ) was 97.8%. The product was characterized by XRD, EDS and SEM, and the results indicated that the product was NaSb(OH)6(i.e., sodium pyroantimonate), which had a crystallinity of 99.62% and a S element impurity content of 0.23% by mass. The particle size of the product was about 100 nm, and its morphology was rice-shaped.
作者
钱福军
薛敏华
浮建军
莫友彬
曹家兴
QIAN Fu-jun;XUE Min-hua;FU Jian-jun;MO You-bin;CAO Jia-xing(College of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China;Guangxi Research Institute of Chemical Industry,Nanning 530001,China)
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2020年第2期45-50,共6页
Natural Gas Chemical Industry
关键词
栲胶
焦锑酸钠
催化
空气氧化法
形貌
tannin extract
sodium pyroantimonate
catalysis
air oxidation process
morphology
