Preparation of a novel Fe3O4/graphite oxide nanosheet/citric acid-crosslinked β-cyclodextrin polymer composite to remove methylene blue from water

Jiang, Luxia; Zeng, Feng-Tao; Zhang, Yi; Xu, Meng-Ya; Xie, Ze-Wu; Wang, Huaying; Wu, Ying-Xuan; He, Fu‐An; Jiang, Hongliu

doi:10.1016/j.apt.2020.12.026

Cited by 26 publications

(8 citation statements)

References 41 publications

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“…The fast adsorption was mainly attributed to the boundary layer diffusion and the slow adsorption was due to the intraparticle diffusion. The curve of the two sections did not pass through the origin, which proved that paraquat adsorption was a complicated procedure, as published in the literature [ 107 , 108 ].…”

Section: Resultsmentioning

confidence: 72%

Adsorption of Paraquat by Poly(Vinyl Alcohol)-Cyclodextrin Nanosponges

2021

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The contamination of hydrosoluble pesticides in water could generate a serious problem for biotic and abiotic components. The removal of a hazardous agrochemical (paraquat) from water was achieved by adsorption processes using poly(vinyl alcohol)-cyclodextrin nanosponges, which were prepared with various formulations via the crosslinking between citric acid and β-cyclodextrin in the presence of poly(vinyl alcohol). The physicochemical properties of nanosponges were also characterized by different techniques, such as gravimetry, thermogravimetry, microscopy (SEM and Stereo), spectroscopy (UV-visible, NMR, ATR-FTIR, and Raman), acid-base titration, BET surface area analysis, X-ray diffraction, and ion exchange capacity. The C10D-P2 nanosponges displayed 60.2% yield, 3.14 mmol/g COOH groups, 0.335 mmol/g β-CD content, 96.4% swelling, 94.5% paraquat removal, 0.1766 m2 g−1 specific surface area, and 5.2 × 10−4 cm3 g−1 pore volume. The presence of particular peaks referring to specific functional groups on spectroscopic spectra confirmed the successful polycondensation on the reticulated nanosponges. The pseudo second-order model (with R2 = 0.9998) and Langmuir isotherm (with R2 = 0.9979) was suitable for kinetics and isotherm using 180 min of contact time and a pH of 6.5. The maximum adsorption capacity was calculated at 112.2 mg/g. Finally, the recyclability of these nanosponges was 90.3% of paraquat removal after five regeneration times.

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Section: Resultsmentioning

confidence: 72%

Adsorption of Paraquat by Poly(Vinyl Alcohol)-Cyclodextrin Nanosponges

2021

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“…Th slow adsorption with a low adsorption rate constant for the first step (k32) corresp to the intraparticle diffusion. The curve of the two parts did not pass through the which confirmed that organic contaminant adsorption was a complicated [144,145].…”

Section: Kinetics Studymentioning

confidence: 88%

Adsorption of Cationic Contaminants by Cyclodextrin Nanosponges Cross-Linked with 1,2,3,4-Butanetetracarboxylic Acid and Poly(vinyl alcohol)

2022

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Cationic organic pollutants (dyes and pesticides) are mainly hydrosoluble and easily contaminate water and create a serious problem for biotic and abiotic species. The elimination of these dangerous contaminants from water was accomplished by adsorption using cyclodextrin nanosponges. These nanosponges were elaborated by the cross-linking between 1,2,3,4-butanetetracarboxylic acid and β-cyclodextrin in the presence of poly (vinyl alcohol). Their physicochemical characteristics were characterized by gravimetry, acid-base titration, TGA, 13C NMR, ATR-FTIR, Raman, X-ray diffraction, and Stereomicroscopy. The BP5 nanosponges displayed 68.4% yield, 3.31 mmol/g COOH groups, 0.16 mmol/g β-CD content, 54.2% swelling, 97.0% PQ removal, 96.7% SO removal, and 98.3% MG removal for 25 mg/L of initial concentration. The pseudo-second-order model was suitable for kinetics using 180 min of contact time. Langmuir isotherm was suitable for isotherm with the maximum adsorption of 120.5, 92.6, and 64.9 mg/g for paraquat (PQ), safranin (SO), and malachite green (MG) adsorption, respectively. Finally, the reusability performance after five regeneration times reached 94.1%, 91.6%, and 94.6% for PQ, SO, and MG adsorption, respectively.

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“…However, the water solubility of β ‐CD is an obstacle for water treatment. Crosslinkers such as glutaraldehyde (GLA), 38–40 epichlorohydrin (EPI), 41–43 ethylenediaminetetraacetic acid (EDTA), 44,45 and citric acid (CA), 46–48 are therefore used to make the desirable water insoluble β ‐CD. Some of these crosslinkers, for example EPI and GLA, are potentially harmful to human health due to their toxicity and carcinogenicity 49 .…”

Section: Introductionmentioning

confidence: 99%

Beta cyclodextrin modified polyvinylidene fluoride adsorptive mixed matrix membranes for removal of Congo red

Ndlovu

Malatjie

Chabalala

et al. 2022

J of Applied Polymer Sci

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This work reports the adsorptive removal of congo red using as-fabricated polyvinylidene fluoride (PVDF) membranes modified with beta cyclodextrin (β-CD). Diverse techniques were used to characterize the membranes' performance and microstructural and morphological properties. The effect of pH, dye initial concentration, adsorbent dosage, contact time on adsorption efficiency were investigated. Filtration studies were carried out using a deadend cell. The results showed that the introduction of β-CD in membrane matrix improved membrane performance, adsorption, and filtration properties.Bulk porosity increased from 61.46% to 87.55% and contact angle decreased from 84.17 0 to 67.93 0 . Water flux at 1 bar improved from 12.42 to 269.08 L.m À2 . hr À1 . Maximum adsorption for congo red was obtained at pH 7, with PVDF/β-CD membranes removing 96.15% and pristine PVDF removing 54.27% of congo red. The adsorptive removal of congo red was best described by the pseudosecond order kinetics and best fitted the Freundlich isotherm model. According

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Preparation of a novel Fe3O4/graphite oxide nanosheet/citric acid-crosslinked β-cyclodextrin polymer composite to remove methylene blue from water

Cited by 26 publications

References 41 publications

Adsorption of Paraquat by Poly(Vinyl Alcohol)-Cyclodextrin Nanosponges

Adsorption of Paraquat by Poly(Vinyl Alcohol)-Cyclodextrin Nanosponges

Adsorption of Cationic Contaminants by Cyclodextrin Nanosponges Cross-Linked with 1,2,3,4-Butanetetracarboxylic Acid and Poly(vinyl alcohol)

Beta cyclodextrin modified polyvinylidene fluoride adsorptive mixed matrix membranes for removal of Congo red

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