氧化剂高碘酸钠诱发多巴胺自聚合在MBfR膜表面改性中的应用

发布时间：2018-03-28 12:51

本文选题：膜生物膜反应器　切入点：疏水膜　出处：《膜科学与技术》2017年05期

【摘要】：针对膜生物膜反应器(Membrane Biofilm Reactor,MBfR)研究中疏水性微孔膜氧传质性能不佳等问题,采用自聚合法(多巴胺为单体)对自制疏水性聚偏氟乙烯(PVDF)中空纤维膜进行表面改性,并选用高碘酸钠(Sodium Periodate,SP)为氧化剂,研究氧化剂SP投加对于多巴胺自聚合过程、改性膜性能及稳定性的影响.研究结果表明,与未投加SP相比,投加SP能够通过加速多巴胺的自聚合及聚多巴胺在膜表面的沉积,大大缩短多巴胺表面改性时间(自24h降至6h),同时获得适用于MBfR技术的机械性能、亲水性能、氧传质性能良好的多巴胺改性膜,改性膜接触角自原膜76.5°降低至33.4°,氧总转移系数自原膜0.78×10~(-2) min~(-1)提高为1.58×10~(-2) min~(-1)(原膜的2.03倍).此外SP的投加还可以提高改性膜在极性溶液、强酸、强碱中的稳定性,投加SP改性膜在丙酮、0.1mol/L HCl及0.1mol/L NaOH中的稳定性较未投加SP改性膜分别提高了96.5%,85.1%与48.8%.
[Abstract]:In order to solve the problem of poor oxygen transfer of hydrophobic microporous membrane in membrane biofilm reactor (MBFR), self-polymerization (dopamine as monomer) was used to modify the surface of self-made hydrophobic polyvinylidene fluoride polyvinylidene fluoride (PVDF) hollow fiber membrane. Sodium Periodate SPI was used as oxidant to study the effect of SP addition on the properties and stability of dopamine self-polymerization. The addition of SP can accelerate the self-polymerization of dopamine and the deposition of polydopamine on the surface of the film, greatly shorten the modification time of dopamine surface (from 24 h to 6 h), and obtain the mechanical properties and hydrophilicity suitable for MBfR technology. The contact angle of the modified film was reduced from 76.5 掳to 33.4 掳, and the total oxygen transfer coefficient was increased from 0.78 脳 10 ~ (-2) min ~ (-1) to 1.58 脳 10 ~ (10) ~ (-2) min ~ (-1) ~ (-1) (2.03 times of the original film). The stability of the modified membrane added with SP in acetone 0.1 mol / L HCl and 0.1mol/L NaOH was improved by 96.551% and 48.8%, respectively.
【作者单位】：天津工业大学生物化工研究所省部共建分离膜与膜过程国家重点实验室;
【基金】：国家自然科学基金项目(51408415,21576210)
【分类号】：TB383.2

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