Marin Nicoleta Mirela
National Research and Development Institute for Industrial Ecology ECOIND, Street Podu Dambovitei No. 57-73, District 6, 060652 Bucharest, Romania.
Department of Oxide Materials Science and Engineering, National University of Science and Technology Politehnica Bucharest, 1-7 Gh. Polizu, 060042 Bucharest, Romania.
Polymers (Basel). 2025 May 25;17(11):1467. doi: 10.3390/polym17111467.
In this study, two complexing materials were obtained for Mn, Zn, Fe and Cr removal from aqueous media. Synthetic cellulose powder (CELL) and cellulosic green material obtained from shredded maize stalk (MS) were modified with direct red 23 (DR 23), a complexing agent, obtaining MS-DR 23 and CELL-DR 23 using batch mode technique. Experimental parameters like interaction time, pH of aqueous solution, and initial concentration of DR 23 were studied to optimize the complexing process. The time necessary to reach equilibrium was 75 min for both cellulose materials. Also, pH 2 was the optimum adsorption value for adsorption of DR 23. The adsorption capacity for MS (56.8 mg/g) was more significant than for CELL (42 mg/g). The applicability of complexing materials was based on checking for Mn, Zn, Fe and Cr (M) removal. The concentration of M retained on cellulosic materials was detected by the atomic adsorption spectrometry method (AAS). The complex formation between DR 23 and M was evaluated at pH 2.0, 4.0, 6.0, 8.0 and 10.0. Batch adsorption experiments were conducted to assess the adsorption of M onto MS-DR 23 and CELL-DR 23. A high level of M adsorption was reported at 4 mg/L. Reusability experiments were conducted and complexing cellulose was used for multiple cycles of M removal from aqueous media. Also, the developed complexing materials tested M removal from tannery wastewater. Based on experimental study, two complexing materials for metal removal were produced. The good adsorption and regeneration of complexing materials provide an excellent adsorbent for water purification.
在本研究中，制备了两种用于从水介质中去除锰、锌、铁和铬的络合材料。用络合剂直接红23（DR 23）对合成纤维素粉末（CELL）和由粉碎玉米秸秆（MS）获得的纤维素绿色材料进行改性，采用分批模式技术得到MS-DR 23和CELL-DR 23。研究了相互作用时间、水溶液pH值和DR 23初始浓度等实验参数，以优化络合过程。两种纤维素材料达到平衡所需的时间均为75分钟。此外，pH 2是DR 23吸附的最佳值。MS的吸附容量（56.8 mg/g）比CELL的吸附容量（42 mg/g）更显著。络合材料的适用性基于对锰、锌、铁和铬（M）去除情况的检测。通过原子吸收光谱法（AAS）检测纤维素材料上保留的M的浓度。在pH 2.0、4.0、6.0、8.0和10.0下评估DR 23与M之间的络合物形成。进行分批吸附实验以评估M在MS-DR 23和CELL-DR 23上的吸附情况。在4 mg/L时报告了较高水平的M吸附。进行了可重复使用性实验，并将络合纤维素用于从水介质中多次去除M的循环。此外，所开发的络合材料测试了从制革废水中去除M的效果。基于实验研究，制备了两种用于去除金属的络合材料。络合材料良好的吸附和再生性能为水净化提供了优异的吸附剂。
