Pyromellitic dianhydride‐modified β‐cyclodextrin microspheres for Pb(II) and Cd(II) adsorption

Fengyu, Li; Sun, Xin; Zhang, Haizhen; Li, Buhai; Gan, Fuxing

doi:10.1002/app.26376

Cited by 19 publications

(7 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5 Several adsorbents such as aluminum oxide, 6 activated carbon prepared from coir pith, 7 biosorbents, 8,9 and polymeric materials such as dithiocarbamate-anchored polymer/organosmectite 10 and poly(vinyl pyridine-poly ethylene glycol methacrylate-ethylene glycol dimethacrylate) beads 11 are reported for cadmium removal from the aqueous solutions. Adsorption efficiency of many biomaterials have been suitably tailored by chemical modification, for example, pine cone chemically activated with Fenton reagent, 12 surfactant-modified carbon powder from husk and pods of Moringa oleifera, 13 pyromellitic dianhydride-grafted s-cyclodextrin, 14 and cross-linked carboxymethyl konjac glucomannan. 15 Thus several reports are available on the chemical modifications of the biomasses before they are usefully exploited as the adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Efficient Cadmium(II) Removal from Aqueous Solution Using Microwave Synthesized Guar Gum-Graft-Poly(ethylacrylate)

Singh

Sharma

Maurya

2009

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Microwave induced emulsion copolymerization of ethylacrylate and guar gum resulted in copolymer samples of different % grafting (%G) by changing ethylacrylate and guar gum concentrations at fixed microwave power (100%) and exposure time (15 s). The synthesis was done in the absence of any redox initiator/ catalyst, and the adsorption behavior of the copolymer (295%G) was investigated by performing both the kinetics and equilibrium studies in batch conditions. Several experimental parameters such as contact time, initial cadmium concentration, temperature, adsorbent dose, electrolyte amount, and pH of the solution were varied to optimize the adsorption conditions. The most favorable pH for the adsorption was pH 9, and at this pH the adsorption data were modeled using Langmuir and Freundlich isotherms. The data fitted satisfactorily to both the isotherms, indicating that the real heterogeneous nature of the surface sites involved in the metal uptake and overall sorption of Cd(II) on the adsorbent was complex and involved more than one mechanism. On the basis of the Langmuir model, Q 0 was calculated to be 714.28 mg/g for microwave synthesized copolymer (mwGG-g-PEA) in comparison to 270.27 for conventionally synthesized copolymer (cvGG-g-PEA), revealing the advantage of using microwaves in the adsorbent synthesis. The sorption by mwGG-g-PEA followed pseudosecond-order kinetics where a linear plot of t/(qt) versus t was obtained, the correlation coefficient (R 2 ) and rate constant at 100 mg/L Cd(II) being 0.9978 and 4.6 × 10 -4 g/mg/min, respectively. The adsorbent exhibited high reusability and could be successfully recycled for nine cycles where in the ninth cycle 38% adsorption was feasible. To understand the role of PEA grafts (in the copolymer) in the adsorption process, different %G samples were evaluated as adsorbent under optimized conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Efficient Cadmium(II) Removal from Aqueous Solution Using Microwave Synthesized Guar Gum-Graft-Poly(ethylacrylate)

Singh

Sharma

Maurya

2009

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…More significantly, the rigid aromatic linkers were able to strengthen the mechanical abilities of chitosan, important for chromatographic application. PMDA has also been employed to graft with β-CD microspheres in DMF [144]. The adsorption capacities of Pb(II)…”

Section: Dianhydrides Cross-linkermentioning

confidence: 99%

“…Iminodiacetic acid (IDA), as a carboxyl ligand, has been bond with the EPI cross-linked β-CD to increase the binding affinity toward metal ions and α-amylase [181]. Li F. and co-workers have grafted PMDA onto the surface of TDI cross-linked β-CD microspheres introducing a large number of carboxyl groups for the removal of Pb(II) and Cd(II) from aqueous solution [144]. The adsorption capacities of the PMDA modified β-CD microspheres for the studied metals were 7.7-10.7 times higher than those of unmodified ones.…”

Section: Functionalized With Amino Groupsmentioning

confidence: 99%

Cross-linked chitosan and β-cyclodextrin as functional adsorbents in water treatment

Zhao

2020

Advanced Water Treatment

View full text Add to dashboard Cite

In recent decades, the worldwide occurrence in water resources of various pollutants, such as toxic heavy metals, dyes, and pharmaceuticals, has raised increasing public attention about the inverse effects on human health and environment. Polysaccharides, such as chitosan and -cyclodextrin, have the potential to remove these pollutants from water. The present thesis consists of the preparation of five poly(carboxylic acid)s (PACs) or their dianhydrides cross-linked chitosan and/or -cyclodextrin adsorbents, their characterizations, their applications in water treatment, their kinetic and isotherm studies, their probable adsorption mechanisms, and their regeneration abilities.In these settings, chitosan is considered as the backbone of the adsorbents; PACs, such as EDTA and DTPA, act as not only linkages but also chelating groups, which are effective in adsorption of metal ions, and thus enhance the metal uptake abilities of the polysaccharide materials significantly; the immobilized -cyclodextrin cavities are expected to capture organic molecules through host-guest inclusion interaction. These settings combined the advantages of each component while at the same time diminishing their disadvantages.Based on this design, the selective adsorption of targeted metals from multi-metal system was realized by magnetic EDTA-/DTPA-chitosan, due to the fact that the chelating groups possess different binding affinities toward different metals; the simultaneous and efficient removal of metal and dyes were achieved by EDTA-cross-linked -cyclodextrin (EDTA-CDP).The adsorption kinetics were very fast for all the prepared adsorbents. The isotherms revealed the adsorption mechanisms of chelation for metals as well as host-guest inclusion for organic pollutants. These also indicated the regeneration methods for the spent adsorbents, such as diluted nitrate acid for metal-loaded adsorbents and ethanol solvent for organic pollutant-loaded adsorbents. The stability and regenerability guaranteed their applications in practical wastewater such as a real industrial effluent from a nonferrous metal smelter. Lastly, prior to analysis, EDTA-CDP was successfully applied to preconcentrate rare earth elements from seawaters. Overall, both the experimental results and theoretical studies suggest that the studied cross-linked chitosan and/or cyclodextrin polymers are the promising adsorbents in wastewater treatment.

show abstract

“…Dried stalk segment was shattered in a pulverizer and sieved through a 100 mesh sieve for further chemical modification. The grain sorghum stalk was modified following the method of Li et al [13].…”

Section: Modification Of Grain Sorghum Stalkmentioning

confidence: 99%

The Study of the Modified Grain Sorghum Stalk to Remove Methylene Blue Dye from Aqueous Solution

Zhang

Chen

2012

AMR

View full text Add to dashboard Cite

Pyromellitic dianhydride(PMDA）- modified grain sorghum stalk was used as a novel low-cost adsorbent to remove cationic dye methylene blue(MB) from aqueous solution. Bath studies were carried out to investigate the effects of pH and retention time on the adsorption of MB. The adsorption process could obtain >98% removal percentage within 30 minutes as the MB concentration was at 200 and 300 mg/L. And for 400 mg/L MB, 99% was removed in 6 hrs. The kinetics study showed that the adsorption processes followed the pseudo-second-order kinetic model, which confirming that the sorption rate is controlled by chemical adsorption. Equilibrium isotherms were analyzed by the Langmuir and Freundlich models. Langmuir model can be fitted better than Freundlich with maximum monolayer adsorption capacity of 568.18 mg/g for MB.

show abstract

Pyromellitic dianhydride‐modified β‐cyclodextrin microspheres for Pb(II) and Cd(II) adsorption

Cited by 19 publications

References 30 publications

Efficient Cadmium(II) Removal from Aqueous Solution Using Microwave Synthesized Guar Gum-Graft-Poly(ethylacrylate)

Efficient Cadmium(II) Removal from Aqueous Solution Using Microwave Synthesized Guar Gum-Graft-Poly(ethylacrylate)

Cross-linked chitosan and β-cyclodextrin as functional adsorbents in water treatment

The Study of the Modified Grain Sorghum Stalk to Remove Methylene Blue Dye from Aqueous Solution

Contact Info

Product

Resources

About