海带浸泡液中碘离子的新型氧化工艺的研究  

Study on new oxidation process for iodine ion in kelp soaking liquid

作　　者：闫绍鹏[1,2] 苗钧魁[1,2] 蒋鹏[1] 冷凯良[2] 孙伟红[2] 邢丽红[2] 于跃芹[1] 

机构地区：[1]青岛科技大学化学与分子工程学院,山东青岛266042 [2]中国水产科学研究院黄海水产研究所

出　　处：《无机盐工业》2014年第7期27-29,共3页Inorganic Chemicals Industry

基　　金：大型海藻新型产品加工技术(2013BAB01B03);食品海带加工废水污染控制及综合利用(20603022013031)

摘　　要：采用亚硝酸钠-过氧化氢混合氧化剂将海带浸泡液中的碘离子氧化为碘酸根离子,并以其为氧化剂进一步氧化海带浸泡液中的碘离子生成单质碘,达到回收碘的目的。研究了利用混合氧化剂制备碘酸根离子的反应条件,得到最佳反应条件为:100 mL的含碘量为498 mg/kg的海带浸泡液需要加入混合氧化剂的量分别为50μL 8%(质量分数)亚硝酸钠溶液、150μL 30%(质量分数)过氧化氢(过氧化氢与碘离子物质的量比为3.5∶1)。将制得的碘酸根离子作为氧化剂氧化碘离子,考察了pH、碘离子与碘酸根离子物质的量比、反应时间对海带浸泡液中碘离子氧化率的影响。结果表明,在pH为2.0、碘离子与碘酸根离子物质的量比为5∶1、反应时间为30 min的最优条件下,碘的氧化率为94.96%。I- in the kelp soaking liquid was oxidized into IO3- by the mixed oxidant NaNO2-H2O2, and with the oxidant IO3-, I- in the soaking liquid was further oxidized into elemental iodine ,to achieve the purpose of recycling iodine. The reaction conditions of using mixed oxidant to prepare IO3- were studied.The optimum reaction conditions were as follows： the dosage of mixed oxidant was 50 μL, 8% （mass fraction） NaNO2 solution and 150 μL, 30% （mass fraction） H2O2 （the amount-of-substance ratio of H2O2 to I- is approximately 3.5：1）,in 100 mL of kelp soaking liquid with the iodine content of 498 mg/kg.The obtained IO3- was as the oxidant to oxidize I-.The effects of pH, amount-of-substance ratio of I- to IO3- and reaction time on I- conversation rate were investigated.Results showed that when the pH was 2.0, the amount-of-substance ratio of I- to IO3- was 5：1, and the reaction time was for 30 min, the iodine oxidation rate was 94.96%.

关 键 词：碘 双氧水 亚硝酸钠 氧化反应 海带提碘 

分 类 号：TQ124.61[化学工程—无机化工]