Saleem Junaid, Moghal Zubair Khalid Baig, Pradhan Snigdhendubala, Hafeez Ahsan, Shoaib Mohammad, Alahmad Johaina, McKay Gordon
Division of Sustainable Development, College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, Doha 5825, Qatar.
Center for Advanced Materials, Qatar University, Doha 2713, Qatar.
Polymers (Basel). 2024 May 22;16(11):1459. doi: 10.3390/polym16111459.
Traditional bulk adsorbents, employed for the removal of dyes and metal ions, often face the drawback of requiring an additional filtration system to separate the filtrate from the adsorbent. In this study, we address this limitation by embedding the adsorbent into the polymer matrix through a process involving dissolution-dispersion, spin-casting, and heat-stretching. Selective dissolution and dispersion facilitate the integration of the adsorbent into the polymer matrix. Meanwhile, spin-casting ensures the formation of a uniform and thin film structure, whereas heat-induced stretching produces a porous matrix with a reduced water contact angle. The adsorbent selectively captures dye molecules, while the porous structure contributes to water permeability. We utilized inexpensive and readily available materials, such as waste polyethylene and calcium carbonate, to fabricate membranes for the removal of methylene blue dye. The effects of various parameters, such as polymer-adsorbent ratio, initial dye concentration, and annealing temperature, were investigated. Equilibrium data were fitted to Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherms. The equilibrium data were best represented by the Langmuir isotherm, with maximum adsorption capacity of 35 mg/g and 43 mg/g at 25 °C and 45 °C, respectively. The membranes can be regenerated and recycled with a 97% dye removal efficiency. The study aims to present a template for adsorbent-embedded polymeric membranes for dye removal, in which adsorbent can be tailored to enhance adsorption capacity and efficiency.
用于去除染料和金属离子的传统块状吸附剂，常常面临需要额外的过滤系统来将滤液与吸附剂分离的缺点。在本研究中，我们通过一个涉及溶解 - 分散、旋涂和热拉伸的过程，将吸附剂嵌入聚合物基质中来解决这一限制。选择性溶解和分散有助于吸附剂融入聚合物基质。同时，旋涂确保形成均匀且薄膜状的结构，而热诱导拉伸则产生具有减小的水接触角的多孔基质。吸附剂选择性地捕获染料分子，而多孔结构有助于水的渗透性。我们利用廉价且易于获得的材料，如废弃聚乙烯和碳酸钙，来制备用于去除亚甲基蓝染料的膜。研究了各种参数的影响，如聚合物 - 吸附剂比例、初始染料浓度和退火温度。将平衡数据拟合到朗缪尔、弗伦德利希、特姆金和杜宾宁 - 拉杜舍维奇等温线。平衡数据最好由朗缪尔等温线表示，在25℃和45℃时的最大吸附容量分别为35mg/g和43mg/g。这些膜可以再生和循环使用，染料去除效率达97%。本研究旨在为用于染料去除的吸附剂嵌入聚合物膜提供一个模板，其中吸附剂可以进行定制以提高吸附容量和效率。
