Zhang Peng, Liao Lina, Zhu Guocheng
College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China.
College of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China.
Materials (Basel). 2019 Sep 2;12(17):2824. doi: 10.3390/ma12172824.
A novel composite was synthesized by using flocculant polyaluminum titanium silicate chloride (PATC) and poly(diallyldimethylammonium chloride) (PDMDAAC) monomers to treat low-temperature and low-turbidity water. The structure and physicochemical properties of PATC-PDMDAAC were analyzed by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis/differential scanning calorimetry (TG/DSC), X-ray diffraction spectroscopy (XRD), and scanning electron microscopy-energy dispersion spectrum (SEM-EDS). The compound flocculant produced new functional groups exhibiting great thermal stability, and the complex chemical reaction between the two monomers generated new substances with reticular structures. Coagulation performance results showed that the PATC-PDMDAAC had an organic and inorganic ratio of 0.15 and exhibited excellent removal efficiency at pH 9.0, dosage of 1.80 mg/L, sedimentation time of 40 min, and a stirring speed of 110 r/min. The optimal treatment efficiency reduced the turbidity to 0.56 NTU (Nephelometric Turbidity Unit). The removal rates of TOC (Total Organic Carbon) and UV254 (Ultraviolet 254) were 62.18% (from 7.23 mg/L to 2.734 mg/L) and 99.99% (from 10 mg/L to 0.001 mg/L). The 3D fluorescence, zeta potential and kinetic analysis in the flocculation process indicated that coagulant electroneutralization and adsorption bridge in a slightly alkaline environment played a dominant role, and a sufficient and effective collision occurred between the coagulant and particulate matter under the optimal dosage. Lastly, PATC-PDMDAAC has more advantage than conventional flocculants in the treatment of low-temperature and low-turbidity water in the Xiangjiang River.
通过使用絮凝剂聚铝钛硅酸氯（PATC）和聚二烯丙基二甲基氯化铵（PDMDAAC）单体来处理低温低浊水，合成了一种新型复合材料。采用傅里叶变换红外光谱（FTIR）、热重分析/差示扫描量热法（TG/DSC）、X射线衍射光谱（XRD）以及扫描电子显微镜-能谱（SEM-EDS）对PATC-PDMDAAC的结构和理化性质进行了分析。该复合絮凝剂产生了具有高热稳定性的新官能团，两种单体之间的复杂化学反应生成了具有网状结构的新物质。混凝性能结果表明，PATC-PDMDAAC的有机与无机比例为0.15，在pH值为9.0、投加量为1.80 mg/L、沉降时间为40 min以及搅拌速度为110 r/min的条件下表现出优异的去除效率。最佳处理效率将浊度降低至0.56 NTU（浊度单位）。总有机碳（TOC）和UV254（紫外线254）的去除率分别为62.18%（从7.23 mg/L降至2.734 mg/L）和99.99%（从10 mg/L降至0.001 mg/L）。絮凝过程中的三维荧光、zeta电位和动力学分析表明，在弱碱性环境中混凝剂的电中和及吸附架桥起主导作用，且在最佳投加量下混凝剂与颗粒物之间发生了充分有效的碰撞。最后，PATC-PDMDAAC在处理湘江低温低浊水方面比传统絮凝剂更具优势。
