|Brilliant red X-3B uptake by a novel polycyclodextrin-modified magnetic cationic hydrogel: Performance, kinetics and mechanism|
|Li, Junyi; Wang, Yili; Dou, Xiaomin; Hao, Haotian; Dong, Shuoxun; Shao, Xia; Deng, Yanchun
|Source Publication||JOURNAL OF ENVIRONMENTAL SCIENCES
|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 16.7 mV at pH 3.0-10.5. The maximum X-3B adsorption capacity of PCD-MCH was 2792.3 mg/g. The adsorption kinetics could be well-described by the WebereMorris 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 480-1200 min, respectively. The latter two diffusion stages were rate-controlling for X-3B adsorption kinetics. At the initial X-3B concentration of 600 mg/L, the diffusion coefficient (D-s) and external mass transfer coefficient in the liquid phase (k(F)) were 3 x 10 (11) cm(2)/ min and 4.68 x 10(-6) cm/min, respectively. X-3B approaching the center of PCD-MCH particles could be observed at 360 min. At the end of the third diffusion stage, the Cp at q/q(e) = 0 was 45.20 mg/L, which was close to the homogeneous C-p value of 46 mg/L along the radius of PCD-MCH particles. At pH 3.0-10.0, PCD-MCH showed stable X-3B adsorption capacities. After five regeneration-reuse cycles, the residual adsorption capacity of regenerated PCD-MCH was higher than 892.7 mg/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. (c) 2019 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.|
Polycyclodextrin-magnetic cationic hydrogel
Reactive brilliant red X-3B
Homogeneous surface diffusion model (HSDM)
Li, Junyi,Wang, Yili,Dou, Xiaomin,et al. Brilliant red X-3B uptake by a novel polycyclodextrin-modified magnetic cationic hydrogel: Performance, kinetics and mechanism[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2020,89:264-276.
Li, Junyi.,Wang, Yili.,Dou, Xiaomin.,Hao, Haotian.,Dong, Shuoxun.,...&Deng, Yanchun.(2020).Brilliant red X-3B uptake by a novel polycyclodextrin-modified magnetic cationic hydrogel: Performance, kinetics and mechanism.JOURNAL OF ENVIRONMENTAL SCIENCES,89,264-276.
Li, Junyi,et al."Brilliant red X-3B uptake by a novel polycyclodextrin-modified magnetic cationic hydrogel: Performance, kinetics and mechanism".JOURNAL OF ENVIRONMENTAL SCIENCES 89(2020):264-276.
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