Rusu Lăcrămioara, Grigoraș Cristina-Gabriela, Simion Andrei-Ionuț, Suceveanu Elena-Mirela, Blaga Alexandra-Cristina, Harja Maria
Faculty of Engineering, "Vasile Alecsandri" University of Bacau, 157 Calea Mărăşeşti, 600115 Bacau, Romania.
Faculty of Chemical Engineering and Environmental Protection "Cristofor Simionescu", "Gheorghe Asachi" Technical University from Iasi, 71 A Mangeron Blvd., 700050 Iasi, Romania.
Polymers (Basel). 2022 Jan 1;14(1):170. doi: 10.3390/polym14010170.
Pharmaceuticals are recognized as emerging water microcontaminants that have been reported in several aquatic environments worldwide; therefore, the elimination of these pollutants is a global challenge. This study aimed to develop a biosorbent based on residual biomass encapsulated in a calcium alginate matrix and to evaluate its biosorption performance to remove Ethacridine Lactate (EL) from aqueous solutions. Firstly, the synthesis and characterization of biosorbent has been carried out. Then, the impact of main parameters on biosorption process were investigated by batch experiments. Finally, the kinetics behavior and equilibrium isotherms were evaluated. The resulted beads have an irregular and elongated shape with about 1.89 mm ± 0.13 mm in size with a homogeneous structure. The best removal efficiency for EL of over 85% was obtained at acidic pH 2 and 25 °C for 50 mg/L initial concentration and 2 g/L biosorbent dose. The pseudo-second-order and intraparticle diffusion kinetics describe the biosorption process. The maximum calculated biosorption capacity was 21.39 mg/g similar to that recorded experimentally. The equilibrium biosorption data were a good fit for Freundlich and Dubinin-Radushkevich isotherms. Our findings reveal that the low cost and eco-friendly obtained biosorbent can be easily synthesized and suitable to remove Ethacridine Lactate from water matrices.
药物被认为是新兴的水中微污染物，已在全球多个水生环境中被报道；因此，消除这些污染物是一项全球性挑战。本研究旨在开发一种基于包裹在海藻酸钙基质中的残余生物质的生物吸附剂，并评估其从水溶液中去除乳酸依沙吖啶（EL）的生物吸附性能。首先，进行了生物吸附剂的合成与表征。然后，通过批次实验研究了主要参数对生物吸附过程的影响。最后，评估了动力学行为和平衡等温线。所得珠子形状不规则且呈细长形，尺寸约为1.89毫米±0.13毫米，结构均匀。对于50毫克/升的初始浓度和2克/升的生物吸附剂剂量，在酸性pH 2和25℃条件下，EL的最佳去除效率超过85%。伪二级和颗粒内扩散动力学描述了生物吸附过程。计算得到的最大生物吸附容量为21.39毫克/克，与实验记录值相似。平衡生物吸附数据与Freundlich和Dubinin-Radushkevich等温线拟合良好。我们的研究结果表明，所获得的低成本且环保的生物吸附剂易于合成，适合从水基质中去除乳酸依沙吖啶。
