Cyclodextrin-based adsorbents for the removal of pollutants from wastewater: a review

Tian, Bingren; Hua, Shiyao; Tian, Yu; Liu, Jiayue

doi:10.1007/s11356-020-11168-2

Cited by 84 publications

(44 citation statements)

References 164 publications

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“…A similar observation was reported before for biosorption of Cd, Co and Zn onto hemp fibers [ 28 , 30 , 31 ] and biosorption of Cu and Zn onto flax fibers [ 36 ]. In each experiment, a change in the solution pH was systematically observed after contact with the felts, also suggesting a chemisorption mechanism [ 48 , 49 , 50 , 51 , 52 ]. The pH increase at the end of the experiments was less than 0.4 and less than 0.7 units for hemp- and flax-based felts, respectively.…”

Section: Resultsmentioning

confidence: 98%

Biosorbents from Plant Fibers of Hemp and Flax for Metal Removal: Comparison of Their Biosorption Properties

et al. 2021

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Lignocellulosic fibers extracted from plants are considered an interesting raw material for environmentally friendly products with multiple applications. This work investigated the feasibility of using hemp- and flax-based materials in the form of felts as biosorbents for the removal of metals present in aqueous solutions. Biosorption of Al, Cd, Co, Cu, Mn, Ni and Zn from a single solution by the two lignocellulosic-based felts was examined using a batch mode. The parameters studied were initial metal concentration, adsorbent dosage, contact time, and pH. In controlled conditions, the results showed that: (i) the flax-based felt had higher biosorption capacities with respect to the metals studied than the hemp-based felt; (ii) the highest removal efficiency was always obtained for Cu ions, and the following order of Cu > Cd > Zn > Ni > Co > Al > Mn was found for both examined biosorbents; (iii) the process was rapid and 10 min were sufficient to attain the equilibrium; (iv) the efficiency improved with the increase of the adsorbent dosage; and (v) the biosorption capacities were independent of pH between 4 and 6. Based on the obtained results, it can be considered that plant-based felts are new, efficient materials for metal removal.

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Section: Resultsmentioning

confidence: 98%

Biosorbents from Plant Fibers of Hemp and Flax for Metal Removal: Comparison of Their Biosorption Properties

et al. 2021

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“…In recent years, there have been growing concerns arising from the rapid pollution of water bodies around the world 1 . This is attributed to technological advancements resulting in the rapid growth of industries, and subsequently the pollution of water from industrial effluents 2 , 3 . This water pollution has significantly affected aquatic lives, made the water unsafe for drinking, and resulted in several health effects 4 , 5 .…”

Section: Introductionmentioning

confidence: 99%

One-pot synthesis of zinc oxide nanoparticles via chemical precipitation for bromophenol blue adsorption and the antifungal activity against filamentous fungi

Akpomie

Ghosh

Gryzenhout

et al. 2021

Sci Rep

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In this research, zinc oxide nanoparticles (ZnONPs) were prepared via a facile one-pot chemical precipitation approach and applied in the adsorption of bromophenol blue (BRB) and as antifungal agents against the filamentous fungi and plant pathogens; Alternaria alternata CGJM3078, Alternaria alternata CGJM3006 and Fusarium verticilliodes CGJM3823. The ZnONPs were characterized by the UV–Vis, FTIR, XRD, TGA, BET, SEM, TEM, and EDX techniques, which showed efficient synthesis. The characteristics ZnO UV–Vis absorption band was observed at 375 nm, while the XRD showed an average ZnONPs crystalline size of 47.2 nm. The SEM and TEM images showed an irregular shaped and aggregated porous structure of 65.3 nm average-sized ZnONPs. The TGA showed 22.9% weight loss at 800 °C indicating the high thermal stability of ZnONPs, while BET analysis revealed a surface area, pore volume and pore diameter of 9.259 m2/g, 0.03745 cm3/g and 9.87 nm respectively. The Freundlich, pseudo-second-order, and intra-particle diffusion models showed R2 > 0.9494 and SSE < 0.7412, thus, exhibited the best fit to the isotherm and kinetics models. Thermodynamics revealed feasible, endothermic, random, and spontaneous adsorption of BRB onto the synthesized ZnONPs. The antifungal assay conducted depicts strong antifungal activities against all three tested fungi. Noticeably, ZnONPs (0.002–5 mg/mL) showed maximum activities with the largest zone of inhibition against A. alternata CGJM 3006 from 25.09 to 36.28 mm. This was followed by the strain F. verticilliodes CGJM 3823 (range from 23.77 to 34.77 mm) > A. alternata CGJM3078 (range from 22.73 to 30.63 mm) in comparison to Bleach 5% (positive control). Additionally a model was proposed based on the possible underlying mechanisms for the antifungal effect. This research demonstrated the potent use of ZnONPs for the adsorption of BRB and as effective antifungal agents.

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“…Considering the 6% mass concentration of CD in the membrane, the adsorption of MB reached 18 mg g −1 of grafted CD. This value remained lower than that of free molecular CD [64], suggesting restrained mass transport in the membrane. Accordingly, the fitted evolution of MB concentration in solution during complexation with membranes grafted CD moieties exhibited a two phase exponential decay, indicating the occurrence of two adsorption mechanisms following a fast (time constant τ 1 ≈ 1 min) and a slow (time constant τ 2 ≈ 43 min) kinetics and leading to equilibrium after 8 h of contact (Fig.…”

Section: Functionalization Of Membranes With Pendant β-Cyclodextrin Moietiesmentioning

confidence: 65%

Functional Elastomeric Copolymer Membranes Designed by Nanoarchitectonics Approach for Methylene Blue Removal

Sciortino

Sanchez‐Ballester

Mir

et al. 2021

J Inorg Organomet Polym

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The nanoarchitectonic approach, based on nanoscale structural units combination for achieving materials with predesignated properties, was used for assembling elastomeric membranes with specific adsorption abilities. A triblock copolymer polystyrene-b-poly(ethylene-ran-butylene)-b-polystyrene-graft-maleic anhydride (PSEBMA), containing 2 wt% of maleic anhydride moieties, was selected for conferring both elastomeric properties and covalent reticulation/functionalization points to the materials. Covalently crosslinked membranes were obtained by condensation of maleic anhydride units with bisamine linkers, leading to amide and imide bonds formation. Tuning the molecular weight (1kDa or 8kDa) and the stoichiometric ratio of bisamine linkers enabled controlling the mechanical properties of elastomeric membranes, reaching a toughness of 1.35 MJ m −3 with a fracture strain exceeding 100%. Functionalization of these membranes was achieved by covalent reaction with β-aminocyclodextrins (CD), enabling cumulating elastomeric properties with host-guest complexation abilities. CDfunctionalized PSEBMA membranes were tested for removal of methylene blue (MB) as a model aromatic pollutant, demonstrating specific adsorption abilities up to 18 mg g −1 of grafted CD. These findings were supported by physical-chemical investigations using ATR-FTIR, UV-Vis, TGA, and BET sorption, as well as morphological investigations through SEM, and mechanical analysis by strain-to-break measurements.

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Cyclodextrin-based adsorbents for the removal of pollutants from wastewater: a review

Cited by 84 publications

References 164 publications

Biosorbents from Plant Fibers of Hemp and Flax for Metal Removal: Comparison of Their Biosorption Properties

Biosorbents from Plant Fibers of Hemp and Flax for Metal Removal: Comparison of Their Biosorption Properties

One-pot synthesis of zinc oxide nanoparticles via chemical precipitation for bromophenol blue adsorption and the antifungal activity against filamentous fungi

Functional Elastomeric Copolymer Membranes Designed by Nanoarchitectonics Approach for Methylene Blue Removal

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