The removal of organic dyes from the aquatic system using modified Montmorillonite clay (MMT), one of the low cost adsorbent, was studied in this paper. Polyphosphoric acid (PPA) modified MMT (PMMT) with better surface area was used for adsorbing cationic dyes such as methylene blue(MB), rhodamine B (RB) and anionic dye Rose Bengal. The adsorption capacity of the PMMT clay for MB, RB and Rose Bengal dyes were 293.9 mg g⁻¹, 244.77 mg g⁻¹ and 296.13 mg g⁻¹ respectively and all follows pseudo second order kinetics with Langmuir adsorption isotherm model. For better practical application polyvinyl alchohol (PVA) thin film composite with PMMT as filler was prepared and the adsorption studies were conducted. PVA composite film with 0.5 w/v% PMMT filler was found to be a good adsorbent for the cationic dye than anionic dyes and adsorbs 99% of MB dye from 30 mgL⁻¹ dye solution. The composite film showed pseudo second order kinetics and better fit with the Langmuir model and the mono layer adsorption on the clay surface can be explained by electrostatic interaction between adsorbent and adsorbate. The introduction of the PMMT clay in the PVA matrix increases the thermal stability of neat PVA. Tensile strength of the composite was showing a gradual increase with the amount of PMMT filler and at 0.4% addition of PMMT in PVA, the tensile strength was increased up to 39% when compared to PVA film.

本文研究了使用改性蒙脱土（MMT）（一种低成本的吸附剂）从水系中去除有机染料的方法。具有更好表面积的聚磷酸（PPA）改性的MMT（PMMT）用于吸附阳离子染料，例如亚甲基蓝（MB），若丹明B（RB）和阴离子染料Rose Bengal。该PMMT粘土为MB，RB和玫瑰红染料的吸附容量分别为293.9毫克克^-1，244.77毫克克^-1和296.13毫克克^-1分别遵循Langmuir吸附等温线模型的拟二阶动力学。为了更好的实际应用，制备了以PMMT为填充剂的聚乙烯醇（PVA）薄膜复合材料，并进行了吸附研究。发现具有0.5 w / v％PMMT填料的PVA复合膜对阳离子染料的吸附能力优于阴离子染料，并且可吸附30 mgL ^-1的99％MB染料染料溶液。复合膜表现出拟二阶动力学，并且与Langmuir模型更好地吻合，并且在粘土表面上的单层吸附可以通过吸附剂和被吸附物之间的静电相互作用来解释。在PVA基质中引入PMMT粘土可提高纯PVA的热稳定性。复合材料的拉伸强度显示出随着PMMT填料量的逐渐增加，并且在PVA中添加0.4％的PMMT时，与PVA膜相比，拉伸强度提高了39％。