Multi-functionalized self-floating microspheres for dyes capture: Amphoteric adsorption and rapid surface solid-liquid separation

An, Yanyan; Xiao, Peng; Zheng, Huaili; Zhao, Rui; Han, Mengxin; Mao, Weiwei; Li, Yisen

doi:10.1016/j.jclepro.2021.126535

Cited by 19 publications

(2 citation statements)

References 46 publications

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“…It could be easily regenerated by using EDTA-2Na solution with 51% of regeneration ratio. A multi-functional HGM@MPD-ALS adsorbent with inorganic core and surface modified with organic functional groups was fabricated to treat dyeing wastewaters [25]. The adsorbent was synthesized by co-grafting m-phenylenediamine (MPD) and sodium allyl sulfonate (ALS) on the surface of a hollow glass microsphere (HGM).…”

Section: Synthetic Polymermentioning

confidence: 99%

Wastewater Treatment by Polymeric Microspheres: A Review

Lee

Patel

2022

Polymers

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This review addresses polymer microspheres used as adsorbent for wastewater treatment. The removal of various pollutants (including dyes, heavy metal ions, and organic pollutants) is a prominent issue, as they can cause severe health problems. Porous microspheres can provide large specific area and active sites for adsorption or photo degradation. Enhancement in performance is achieved by various modifications, such as the introduction of nanoparticles, magnetic particles, and ZIF-8. Some microspheres were synthesized from synthetic polymers such as vinylic polymer and polydopamine (PDA) through a facile fabrication process. Natural polymers (such as cellulose, alginate, and chitosan) that are biodegradable and eco-friendly are also used. The adsorbents used in industrial application require high adsorption capacity, thermal stability, and recyclability. Batch adsorption experiments were conducted to investigate the optimal conditions, influence of related factors, and adsorption capacities. Insights regarding the adsorption mechanisms were given from the kinetic model, isotherm model, and various characterization methods. The recyclability is investigated through regeneration ratio, or their maintenance of their capability through repeated adsorption-desorption cycles. The high potential of polymer microsphere for the removal of pollutants from wastewater is shown through the high adsorption capacities, environmentally friendliness, and high stability.

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Section: Synthetic Polymermentioning

confidence: 99%

Wastewater Treatment by Polymeric Microspheres: A Review

Lee

Patel

2022

Polymers

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“…In contrast, F-octosilicate demonstrated buoyancy at the air–water interface for a duration of at least 30 days, even after shaking and sonication without losing its floatability. Floating powder adsorbents such as vanadium difluoride nanobelt and hollow SiO 2 spheres − have been previously reported so far. In addition to the hydrophobic materials and/or low-density materials, surface modification has been employed to make materials float.…”

Section: Resultsmentioning

confidence: 99%

Novel Floating Adsorbent for Water Treatment: Organically Modified Layered Alkali Silicate by Facile Mechanochemical Reaction

Sruamsiri,

Shimojima,

Ogawa

2023

ACS Appl. Mater. Interfaces

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Adsorption serves as an effective way to collect (remove) contaminants from aqueous solution. In the present study, a novel floating adsorbent was designed through surface modification of a layered alkali silicate (octosilicate) using a silane coupling reagent (chlorodimethyl[3-(2,3,4,5,6-pentafluorophenyl)propyl]silane) to collect metal ions from water. By conducting the grafting by solvent-free mechanochemical reaction at room temperature, the external surface of octosilicate was modified to be hydrophobic while preserving the ion exchange capability in the interlayer space. Characterizations of XRD, IR, SEM, TGA, 29Si MAS NMR, and 19F MAS NMR confirmed the successful grafting at the external surface of octosilicate particles. The modified silicate demonstrated buoyancy at the air–water interface, facilitating the concentration of methylene blue, Ni2+, and Pb2+ from aqueous solutions. The adsorbed amounts of metal ions on the floating adsorbent were greater than those reported for the common nonfloating adsorbents (zeolites, clays, and clay minerals).

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