| Title: | "Brilliant red X-3B uptake by a novel polycyclodextrin-modified magnetic cationic hydrogel: Performance, kinetics and mechanism" |
| Author(s): | Li J; Wang Y; Dou X; Hao H; Dong S; Shao X; Deng Y; |
| Address: | "College of Environmental Science and Engineering, Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China. College of Environmental Science and Engineering, Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China. Electronic address: wangyilimail@126.com. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. Beijing Key Lab of Urban Atmospheric Volatile Organic Compounds Pollution Control and Application, Beijing Municipal Research Institute of Environmental Protection, Beijing 100037, China. Electronic address: shaoxia668@sina.com" |
| DOI: | 10.1016/j.jes.2019.09.008 |
| ISSN/ISBN: | 1001-0742 (Print) 1001-0742 (Linking) |
| Abstract: | "A novel polycyclodextrin-modified magnetic cationic hydrogel (PCD-MCH) was developed and its performance, kinetics and mechanism for the removal of reactive brilliant red X-3B (X-3B) were studied. The results showed that the zeta-potential of PCD-MCH was 32.8 to 16.7mV at pH3.0-10.5. The maximum X-3B adsorption capacity of PCD-MCH was 2792.3mg/g. The adsorption kinetics could be well-described by the Weber-Morris model and the homogeneous surface diffusion model (HSDM). Diffusion stages corresponding to surface or film diffusion, intra-particle or wide mesopore diffusion, and narrow mesopore/micropore diffusion occurred at 0-120, 120-480 and 480-1200min, respectively. The latter two diffusion stages were rate-controlling for X-3B adsorption kinetics. At the initial X-3B concentration of 600mg/L, the diffusion coefficient (D(s)) and external mass transfer coefficient in the liquid phase (k(F)) were 3x10(-11)cm(2)/min and 4.68x10(-6)cm/min, respectively. X-3B approaching the center of PCD-MCH particles could be observed at 360min. At the end of the third diffusion stage, the C(p) at q/q(e)=0 was 45.20mg/L, which was close to the homogeneous C(p) value of 46mg/L along the radius of PCD-MCH particles. At pH3.0-10.0, PCD-MCH showed stable X-3B adsorption capacities. After five regeneration-reuse cycles, the residual adsorption capacity of regenerated PCD-MCH was higher than 892.7mg/g. The corresponding adsorption mechanism was identified as involving electrostatic interactions, cyclodextrin cavities and hydrogen bonds, of which cyclodextrin cavities showed prominent capture performance towards dye molecules through the formation of inclusion complexes" |
| Keywords: | "Adsorption Cations Coloring Agents/*chemistry Cyclodextrins/chemistry Hydrogels/*chemistry Hydrogen-Ion Concentration Kinetics Magnetic Phenomena *Water Pollutants, Chemical Water Purification/*methods Electrostatic interactions Homogeneous surface diffus;" |
| Notes: | "MedlineLi, Junyi Wang, Yili Dou, Xiaomin Hao, Haotian Dong, Shuoxun Shao, Xia Deng, Yanchun eng Netherlands 2020/01/02 J Environ Sci (China). 2020 Mar; 89:264-276. doi: 10.1016/j.jes.2019.09.008. Epub 2019 Sep 16" |
