Effect of surfactant and PAM on the settlement of kaolinite particles and its mechanism analysis

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-07-28 DOI:10.37190/ppmp/191720

Jinxia Zhang, Mengfei Zhang, Fusheng Niu, Ziye Wang, Zehong Cheng, Qiuyue Wang

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引用次数: 0

Abstract

High concentrations of fine-grained clay minerals in tailings water are highly detrimental to environmental protection and water recycling. Using kaolinite as the study subject, this research investigates the effects of various cationic surfactants (DDA, DTAB, TTAB, CTAB) and flocculants (APAM, NPAM, CPAM) on the sedimentation of kaolinite particles. The study explores the impact of single agents, combined agents, and the sequence of their addition on kaolinite particle sedimentation. The results indicate that when using individual agents at low concentrations, CTAB outperforms TTAB, DTAB, and DDA, while APAM is more effective than NPAM and CPAM. The optimal performance is achieved with a CTAB concentration of 2×10-4 mol/L and an APAM dosage of 20 mg/L. When combining agents, the best results are observed when CTAB is added before APAM. By fixing the APAM dosage at 20 mg/L and varying the CTAB concentration, the highest sedimentation rate and lowest turbidity are obtained at a CTAB concentration of 1.5×10-4 mol/L. Mechanistic insights were obtained through aggregate imaging, area measurement, zeta potential testing, and contact angle testing. Cationic surfactants alter the surface properties of particles, reducing surface electronegativity and increasing hydrophobicity, which diminishes inter-particle repulsion and promotes aggregation, thereby reducing turbidity. Flocculants form larger flocs through adsorption and bridging, accelerating the sedimentation process. When flocculants and cationic surfactants are used together, the resulting flocs are more stable and larger, with an average floc area reaching 5017.6079 µm2, indicating a significant reduction in fine particles within the solution.

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表面活性剂和 PAM 对高岭石颗粒沉降的影响及其机理分析

尾矿水中高浓度的细粒粘土矿物对环境保护和水循环利用极为不利。本研究以高岭石为研究对象，探讨了各种阳离子表面活性剂（DDA、DTAB、TTAB、CTAB）和絮凝剂（APAM、NPAM、CPAM）对高岭石颗粒沉降的影响。该研究探讨了单一药剂、组合药剂及其添加顺序对高岭石颗粒沉降的影响。结果表明，在使用低浓度单剂时，CTAB 的效果优于 TTAB、DTAB 和 DDA，而 APAM 的效果则优于 NPAM 和 CPAM。CTAB 浓度为 2×10-4 mol/L、APAM 用量为 20 mg/L 时性能最佳。在组合药剂时，先加入 CTAB 再加入 APAM 的效果最佳。将 APAM 的用量固定为 20 mg/L，并改变 CTAB 的浓度，当 CTAB 浓度为 1.5×10-4 mol/L 时，沉淀率最高，浊度最低。通过聚合成像、面积测量、zeta 电位测试和接触角测试，我们获得了对机理的深入了解。阳离子表面活性剂改变了颗粒的表面特性，降低了表面电负性，增加了疏水性，从而降低了颗粒间的排斥力，促进了聚集，从而降低了浊度。絮凝剂通过吸附和架桥作用形成较大的絮团，加速沉淀过程。当絮凝剂和阳离子表面活性剂同时使用时，所形成的絮凝物更加稳定，体积也更大，平均絮凝面积达到 5017.6079 µm2，表明溶液中的细小颗粒显著减少。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.