One-Pot Synthesis and Combined Use of Modified Cotton Adsorbent and Flocculant for Purifying Dyeing Wastewater,ACS Sustainable Chemistry & Engineering

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One-Pot Synthesis and Combined Use of Modified Cotton Adsorbent and Flocculant for Purifying Dyeing Wastewater
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-04-10 00:00:00 , DOI: 10.1021/acssuschemeng.8b00713
Chunli Song ₁ , Junhong Zhao ₁ , Hongyan Li ₁ , Lina Liu ₁ , Xuan Li ₁ , Xing Huang ₁ , Hailin Liu ₁ , Yikai Yu _{1,

2}

Affiliation

A one-pot polymerization system using tetradecyl allyldimethylammonium chloride (TADMAC) and grafting cotton with unsaturated bonds (G-cotton) was designed to synthesize novel long-chain alkylation polycationic cotton (LP-cotton) and the homopolymer of TADMAC (PTADMAC). The LP-cotton had a high cationic degree of substitution of 0.108. The high monomer conversion of 98.8% suggests that almost all the TADMAC monomers participated in the polymerization. It is possible that when only LP-cotton was used as the adsorbent, its long-chain alkylation cationic TADMAC unit played the role of a similar surfactant in enhancing the association between the dye and cotton surface, resulting in a great improvement in adsorption capacity. The adsorption capacities were 57.5, 531.7, 4.4, and 2.9 times higher than those of the widely used activated carbon, untreated cotton, G-cotton, and polycationic film-coated cotton (PF-cotton), respectively, reported in our previous study. Using only PTADMAC as the flocculant led to a wide range of application adaptability, removing more than 97.0% of various anionic dyes in the water by forming flocs. As a result, PTADMAC could also be used as an enhancer at a low dosage for improving the flocculation ability of some conventional flocculants. Moreover, due to the mutual associations of the long-chain tetradecyl groups, the combined use of the LP-cotton adsorbent and PTADMAC flocculant not only reduced the dosage of LP-cotton adsorbent to 30% of that required for adsorption-only treatments but also decreased the dye removal time to 10 s. The dye solution became clear almost instantly, enhancing the removal of water-soluble dyes from water more comprehensively than the use of adsorbent or flocculant alone.

中文翻译：

一锅法合成改性棉吸附剂和絮凝剂联合用于印染废水的净化

设计了一种使用十四烷基烯丙基二甲基氯化铵（TADMAC）和不饱和键接枝棉（G-棉）的单锅聚合系统，以合成新型长链烷基化聚阳离子棉（LP-棉）和TADMAC均聚物（PTADMAC）。LP棉具有0.108的高阳离子取代度。98.8％的高单体转化率表明几乎所有TADMAC单体都参与了聚合反应。当仅将LP棉用作吸附剂时，其长链烷基化阳离子TADMAC单元有可能在增强染料与棉表面之间的缔合方面发挥类似表面活性剂的作用，从而大大提高了吸附能力。吸附能力是广泛使用的活性炭的57.5、531.7、4.4和2.9倍，未经处理的棉花，G棉和聚阳离子薄膜包衣棉（PF棉）分别在我们先前的研究中进行了报道。仅使用PTADMAC作为絮凝剂可产生广泛的应用适应性，通过形成絮凝剂可去除水中99.7％以上的各种阴离子染料。结果，PTADMAC还可以低剂量用作增强剂，以改善某些常规絮凝剂的絮凝能力。此外，由于长链十四烷基的相互缔合，LP-棉吸附剂和PTADMAC絮凝剂的组合使用不仅将LP-棉吸附剂的剂量减少到仅吸附处理所需剂量的30％，而且减少了染料去除时间至10 s。染料溶液几乎立即变得清澈，

更新日期：2018-04-10

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