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首页> 外文期刊>RSC Advances >Effect of novel polysiloxane functionalized poly(AMPS-co-CEA) membranes for base recovery from alkaline waste solutions via diffusion dialysis
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Effect of novel polysiloxane functionalized poly(AMPS-co-CEA) membranes for base recovery from alkaline waste solutions via diffusion dialysis

机译：新型聚硅氧烷功能化聚（AMPS-co-CEA）膜通过扩散渗析从碱性废液中回收碱的效果

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摘要

In the modern arena of separation science and technology, cation exchange membrane (CEM) based diffusion dialysis (DD) has attracted remarkable attention due to its unique ion transport phenomena during applications for base recovery. In this manuscript, for the first time we reveal novel disodium 4-formylbenzene-1,3-disulfonate modified polysiloxane (FSP) induced poly(AMPS-co-CEA) based CEMs with polyvinyl alcohol (PVA) as a binder and tetraethoxysilane (TEOS) acting as a crosslinker for base recovery via diffusion dialysis. Synthesis of poly(AMPS-co-CEA) involved classical free radical polymerization with azobisisobutyronitrile (AIBN) acting as an initiator. By regulating the dosage of FSP in the membrane matrix, the physiochemical as well as the electrochemical properties of the prepared membranes can be modified. The prepared membranes were investigated comprehensively in terms of water uptake (W-R), ion exchange capacity (IEC) along with thermo-mechanical measurements like DMA and TGA. The effect of FSP was discussed in brief to correlate the base recovery behaviour of the prepared membranes. The prepared CEMs have water uptakes (W-R) in the range 204.0-248.7%, ion exchange capacities (IEC) between 0.58 and 0.76 mmol g(-1), tensile strengths (TS) between 9.3 and 15.9 MPa as well as elongations at break (E-b) of 125.6-236.7%. At 25 degrees C, the dialysis coefficient (U-OH) values appeared as high as 0.0078-0.0112 m h(-1) and the separation factors (S) ranged from 10.32 to 14.19. The membranes described in this manuscript could be a promising contender for base recovery via diffusion dialysis.
机译：在分离科学和技术的现代舞台上，基于阳离子交换膜（CEM）的扩散渗析（DD）由于其在碱回收应用中的独特离子迁移现象而引起了人们的极大关注。在本手稿中，我们首次揭示了以聚乙烯醇（PVA）为粘合剂和四乙氧基硅烷（TEOS）的新型4-甲酰基苯-1,3-二磺酸二钠改性聚硅氧烷（FSP）诱导的基于聚（AMPS-co-CEA）的CEM ）充当通过扩散渗析回收碱的交联剂。聚（AMPS-co-CEA）的合成涉及经典的自由基聚合，其中偶氮二异丁腈（AIBN）作为引发剂。通过调节膜基质中FSP的剂量，可以改变所制备膜的理化性质和电化学性质。在吸水率（W-R），离子交换容量（IEC）以及热机械测量（例如DMA和TGA）方面，对制备的膜进行了全面研究。简要讨论了FSP的作用，以关联所制备膜的碱回收行为。制备的CEM的吸水率（WR）在204.0-248.7％范围内，离子交换容量（IEC）在0.58至0.76 mmol g（-1）之间，抗张强度（TS）在9.3至15.9 MPa之间，并且断裂伸长率（Eb）为125.6-236.7％。在25摄氏度时，透析系数（U-OH）值高达0.0078-0.0112 m h（-1），分离系数（S）在10.32至14.19之间。该手稿中描述的膜可能是通过扩散渗析回收碱的有前途的竞争者。

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