摘要
在实验中,采用鼓泡氧化反应器分别研究了在空气氧化和臭氧氧化条件下,投加双氧水后亚硫酸铵的氧化率随时间变化情况。结果表明:无论是空气氧化还是臭氧氧化,双氧水的加入均能快速提高亚硫酸铵的氧化率。其中,在空气氧化条件下,对于初始浓度为0.1 mol/L的亚硫酸铵溶液,使氧化率达到60%时的反应时间缩短50 min;在臭氧氧化条件下,对于初始浓度为0.5 mol/L的亚硫酸铵溶液,使氧化率达到60%时的反应时间缩短30 min。但是双氧水也在短时间内消耗殆尽,其后亚硫酸铵的氧化率呈现出与单纯空气氧化或臭氧氧化相同的规律。此外,在双氧水氧化亚硫酸铵过程中,只有部分双氧水参与了氧化反应,而在臭氧氧化条件下双氧水的利用率得到提高,例如对于0.5 mol/L的亚硫酸铵溶液,臭氧气氛下参与反应的双氧水质量分数比空气气氛下高15%,因此臭氧与双氧水可能存在一定的协同作用。
Methods to enhance the oxidation of ammonium sulfite are introduced in this paper. Hydrogen peroxide as an efficient and environment friendly oxidant was used to promote ammonium sulfite oxidation. In the experiment,the bubbling oxidation reactor was used to oxidize ammonium sulfite solution through air aeration or ozone aeration,and the oxidation rate of ammonium sulfite was measured with time. Compared with oxidation through air or ozone aeration,feeding hydrogen peroxide could remarkably increase ammonium sulfite oxidation rate,for example,through air aeration,when oxidation efficiency of 0.1mol/L ammonium sulfite solution reached 60%,reaction time was reduced by 50min and for 0.5mol/L ammonium sulfite solution under the condition of ozone aeration,reaction time was reduced by 30min. However the consumption of hydrogen peroxide was also quite high,resulting in rapid depletion of hydrogen peroxide. In addition,during the ammonium sulfite oxidation process fed by hydrogen peroxide,not all of hydrogen peroxide took part in the oxidation reaction,and the amount of hydrogen peroxide effectively utilized for oxidation became larger under the condition of ozone oxidation than air oxidation. For example,through ozone aeration, the mass fraction of hydrogen peroxide was 15% larger than that through air aeration in 0.5mol/L ammonium sulfite solution. There might be some synergistic effect between ozone and hydrogen peroxide in the ammonium sulfite oxidation process.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2014年第2期505-509,共5页
Chemical Industry and Engineering Progress
基金
国家自然科学基金(21107044)
江苏省环保厅环保科研课题(2012020)
江苏省科技厅产学研联合创新资金--前瞻性联合研究项目(BY2013072-02)
关键词
双氧水
亚硫酸铵
臭氧
氧化率
hydrogen peroxide
ammonium sulfite
ozone
oxidation efficiency
