The adsorption is a well know mass transfer operation that was employed for more than decades in water industry. Predominately carbon based, inorganic materials and MOF etc. have been widely employed as an adsorbent. In contrast in the present study polymeric nano beads incorporated with MOF were synthesized for efficient adsorption performances. The polymeric beads were obtained from Polyethersulfone (PES) and was incorporated with ZIF-8. In the inception phase, ZIF-8 incorporated PES polymeric beads were prepared through non-solvent induced phase separation (NIPS) process to discern the factors governing the adsorption mechanism. The zeta potential analysis showed that adding ZIF-8 into the PES matrix changed the charge from negative to positive. The ZIF-8@PES showed a maximum adsorption efficiency of 99.7% for CR dye removal compared to 14% of unmodified PES. The enhanced CR removal due to ZIF-8 addition was specifically due to π-π interactions between the linker and CR molecules, open Zn metal sites and electrostatic attraction. The sorption followed the Langmuir isotherm and Elovich kinetic model. The performance and regeneration studies showed that the modified beads were 91.1% efficient up to 4 cycles.

吸附是一种众所周知的传质操作，在水工业中已使用了数十年。主要是碳基无机材料和MOF等已被广泛用作吸附剂。相比之下，在本研究中，合成了掺有 MOF 的聚合物纳米珠，以实现高效的吸附性能。聚合物珠取自聚醚砜 (PES)，并与 ZIF-8 混合。在起始阶段，通过非溶剂诱导相分离 (NIPS) 过程制备 ZIF-8 掺入 PES 聚合物珠，以了解控制吸附机制的因素。Zeta 电位分析表明，将 ZIF-8 添加到 PES 基质中，电荷从负变为正。ZIF-8@PES 对 CR 染料去除的最大吸附效率为 99.7%，而未改性 PES 的最大吸附效率为 14%。添加 ZIF-8 所导致的 CR 去除增强主要是由于连接体和 CR 分子之间的 π-π 相互作用、开放的 Zn 金属位点和静电引力。吸附遵循 Langmuir 等温线和 Elovich 动力学模型。性能和再生研究表明，改性珠子在 4 个周期内的效率为 91.1%。