School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, 510006, Guangdong, China.
Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China.
Environ Sci Pollut Res Int. 2021 Jan;28(2):1933-1947. doi: 10.1007/s11356-020-10620-7. Epub 2020 Aug 29.
In this study, a novel anionic template polymer (TPAS) with microblock structure was prepared by ultraviolet light (UV)-assisted template copolymerization (UV-TP). Acrylamide (AM) and sodium styrene sulfonate (SSS) were selected as monomers and polypropylene ammonium chloride (PAAC) was chosen as the template. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), nuclear magnetic resonance hydrogen spectroscopy (H NMR), and thermogravimetry/differential scanning calorimetry (TG/DSC) were used to characterize the polymer chemical structure. The results showed that the attractive anionic microblock structure was formed in TPAS. Besides, the association constant (K) and template reaction kinetics analysis results indicated that the polymerization reaction followed I (ZIP) template copolymerization mechanism. It proved the microblock structure formation again. The anionic microblock structure in TPAM could greatly improve the ability of charge neutralization, electrical patching, and bridging. After the hematite wastewater was conditioned by TPAS with this novel anionic microblock structure, the generated hematite flocs had larger particle size and denser structure. It was favorable for the reduction of turbidity, and the turbidity removal rate could reach 97.8%. TPAS showed excellent flocculation performance for hematite wastewater and had a broad market application prospect.
在这项研究中，通过紫外光（UV）辅助模板共聚（UV-TP）制备了一种具有微嵌段结构的新型阴离子模板聚合物（TPAS）。选择丙烯酰胺（AM）和苯乙烯磺酸钠（SSS）作为单体，聚丙基氯化铵（PAAC）作为模板。采用傅里叶变换红外光谱（FTIR）、X 射线光电子能谱（XPS）、扫描电子显微镜（SEM）、核磁共振氢谱（H NMR）和热重/差示扫描量热法（TG/DSC）对聚合物化学结构进行了表征。结果表明，TPAS 中形成了具有吸引力的阴离子微嵌段结构。此外，结合常数（K）和模板反应动力学分析结果表明，聚合反应遵循 I（ZIP）模板共聚机理。这再次证明了微嵌段结构的形成。TPAM 中的阴离子微嵌段结构能够极大地提高电荷中和、电修补和桥接的能力。新型阴离子微嵌段结构的 TPAS 对赤铁矿废水进行调质后，生成的赤铁矿絮体粒径更大，结构更致密。有利于浊度的降低，浊度去除率可达 97.8%。TPAS 对赤铁矿废水表现出优异的絮凝性能，具有广阔的市场应用前景。
