Organic Polymer Chemistry Research Laboratory, Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran.
Organic Polymer Chemistry Research Laboratory, Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Islamic Republic of Iran.
Carbohydr Polym. 2023 Feb 1;301(Pt B):120362. doi: 10.1016/j.carbpol.2022.120362. Epub 2022 Nov 17.
In this study, a novel effective bio adsorbent was produced and employed to remove congo red and methylene blue dyes from water matrices. First, Zn-Al layered double hydroxide (Zn-Al LDH) was manufactured in a hydrothermal process. Next, through in-situ nucleation and growing of crystalline NH-modified Ti metal-organic framework (NH-MIL-125(Ti) on Zn-Al sheets by solvothermal method, Zn-Al LDH@NH-MIL-125(Ti) hybrid was produced. The prepared hybrid showed good adsorption capacity (q values: 294 mg/g and 158 mg/g) for congo red and methylene blue dyes in optimum condition (adsorbent amount = 5-7 mg, dye concentration = 100-150 mg/L, V = 10 mL, pH = no adjustment, and contact time = 2-5 h). Based on the isotherm and kinetic models, the Langmuir isotherm, as well as the pseudo-second-order model, were fit to the equilibrium data. In the next attempt, to improve the reusability of the powder and particle form of Zn-Al LDH@NH-MIL-125(Ti) hybrid, as well as prevent of formation of secondary contamination in water, Na-alginate, as a cheap and effective substrate, was used. Novel architectures of robust, reusable, and efficient Ca-alginate/Zn-Al LDH@NH-MIL-125(Ti) microgel beads were prepared and the performances of the microbeads were compared with pure LDH@NH-MIL-125(Ti) hybrid.
在这项研究中，制备了一种新型有效的生物吸附剂，并将其用于从水基质中去除刚果红和亚甲基蓝染料。首先，通过水热法制备了 Zn-Al 层状双氢氧化物（Zn-Al LDH）。接下来，通过溶剂热法在 Zn-Al 片上原位成核和生长结晶 NH 改性 Ti 金属有机骨架（NH-MIL-125（Ti），制备了 Zn-Al LDH@NH-MIL-125（Ti）杂化材料。在最佳条件下（吸附剂用量为 5-7 mg，染料浓度为 100-150 mg/L，V=10 mL，pH 值无需调节，接触时间为 2-5 h），所制备的杂化材料对刚果红和亚甲基蓝染料具有良好的吸附能力（q 值分别为 294 mg/g 和 158 mg/g）。基于等温线和动力学模型，平衡数据分别符合朗缪尔等温线和准二级动力学模型。在接下来的尝试中，为了提高 Zn-Al LDH@NH-MIL-125（Ti）杂化材料粉末和颗粒形式的可重复使用性，并防止在水中形成二次污染，使用了廉价且有效的基质 Na-海藻酸钠。制备了坚固、可重复使用且高效的 Ca-海藻酸钠/Zn-Al LDH@NH-MIL-125（Ti）微凝胶珠的新型结构，并将微凝胶珠的性能与纯 LDH@NH-MIL-125（Ti）杂化材料进行了比较。
