Cationic xylan–METAC copolymer as a flocculant for clay suspensions
Cationic xylan–METAC copolymer as a flocculant for clay suspensions
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DOI：
10.1039/c6ra05223a
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发表时间：
2016-04
期刊：
影响因子：
3.9
通讯作者：
Shoujuan Wang;M. Konduri;Q. Hou;P. Fatehi
中科院分区：
文献类型：
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作者：
Shoujuan Wang;M. Konduri;Q. Hou;P. Fatehi
本文介绍的工作集中在絮凝高岭土和膨润土粘土悬浮液在控制条件下使用阳离子共聚木聚糖。阳离子木聚糖-2-（甲基丙烯酰氧基）乙基]三甲基氯化铵（METAC）共聚物在pH 7、3 h反应时间、80 ℃和2或3 mol mol-1 METAC/木聚糖比率的条件下制备。所产生的阳离子木聚糖共聚物CMX 1和CMX 2的电荷密度为+1.8和+2.4meq。g-1，分子量分别为88 986和102 545 g mol-1。通过元素和凝胶渗透色谱分析证实了METAC与木聚糖的连接。CMX 2是一个更有效的絮凝剂比CMX 1，因为它吸附和去除更多的粘土颗粒从粘土悬浮液。CMX 2对粘土悬浮液的zeta电位和浊度的影响也比CMX 1大，这是由于CMX 2具有更高的电荷密度和分子量。CMX 2在膨润土中的吸附效果优于高岭土悬浮液。通过傅里叶变换红外光谱（FTIR）分析证实了粘土颗粒上CMX的存在。通过在粘土悬浮液中分别加入16 mg L-1的CMX 1和CMX 2共聚物，高岭土颗粒的尺寸从3.2 μm增加到9.8 μ m和11.7 μm，膨润土颗粒的尺寸从5.8 μm增加到13.8 μ m和15.5 μm。絮凝过程的可逆性进行了评估与光度分散分析仪。此外，未改性的木聚糖是无效的粘土颗粒。
The work presented herein focused on the flocculation of kaolin and bentonite clay suspensions using cationic copolymerized xylan under controlled conditions. Cationic xylan-2-(methacryloyloxy)ethyl]trimethyl ammonium chloride (METAC) copolymers were produced under the conditions of pH 7, 3 h reaction time, 80 °C and 2 or 3 mol mol−1 METAC/xylan ratio. The charge densities of the produced cationic xylan copolymers, CMX1, and CMX2 were +1.8 and +2.4 meq. g−1 while their molecular weights were 88 986 and 102 545 g mol−1, respectively. The attachment of METAC to xylan was confirmed by elemental and gel permeation chromatography analyses. CMX2 was a more efficient flocculant than CMX1 as it adsorbed and removed more clay particles from the clay suspensions. CMX2 also changed the zeta potential and turbidity of the clay suspensions more remarkably than CMX1, which was attributed to its higher charge density and molecular weight. CMX2 was more efficient in flocculating bentonite than kaolin suspensions. The presence of CMX on the clay particles was confirmed by Fourier Transform Infrared Spectroscopy (FTIR) analysis. The size of kaolin particles increased from 3.2 to 9.8 and 11.7 μm, and that of bentonite particles from 5.8 to 13.8 and 15.5 μm by having 16 mg L−1 of CMX1 and CMX2 copolymers in the clay suspensions, respectively. The reversibility of the flocculation process was assessed with a photometric dispersion analyzer. Furthermore, unmodified xylan was ineffective in flocculating clay particles.