Mussel‐inspired magnetic adsorbent: Adsorption/reduction treatment for the toxic Cr(VI) from simulated wastewater

Abstract

A novel magnetic adsorbent, poly(catechol‐1,4‐butanediamine)‐coated Fe3O4 composite (Fe3O4@PCBA), was successfully fabricated via an easy and gentle method according to the mussel‐inspired adhesion property of polydopamine. Effects of many factors on the adsorption performance of Fe3O4@PCBA for Cr(VI) were investigated, including temperature, pH value, contacting time, adsorbent dosage, and initial Cr(VI) concentration. The thermodynamics, adsorption isotherm, kinetics, and intraparticle diffusion of adsorption were also studied systematically. Results indicated that the removal rate of Cr(VI) was approximately close to 100% when the initial concentration was less than 120 mg/L, and the maximum uptake capacity of Fe3O4@PCBA for Cr(VI) was 280.11 mg/g complied with Langmuir isotherm model. Accordingly, the nocuous Cr(VI) could be partially reduced to Cr(III) during the adsorption period. Hopefully, this strategy could be extended to prepare series of magnetic Fe3O4@catechol–amine adsorbents with different amino and phenolic hydroxyl groups for Cr(VI) removal. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46530.

Facile preparation of hierarchical porous polydopamine microspheres for rapid removal of chromate from the wastewater

“…By contrast, Fig. 6b shows the Cr(VI)-adsorbed PPMs have distinct Cr 2p peak, which can be subdivided into different peaks belonging to Cr(VI) and Cr(III) species [3,37]. It can find that the majority of Cr components are in Cr(III) state, as the content of Cr(III) peaks at 576.61 eV, 577.54 eV and 586.62 eV account for about 80% of the total chromium.…”

“…Cr(VI) containing industrial wastewaters have caused severe pollution to water and soil and emerges as an environmental and health crisis in many areas due to their excellent solubility, mobility, bioaccumulation and carcinogenesis [1,2]. Many industrial activities, such as leather, electroplating and mining, produce a large amount of Cr(VI) containing effluents [3]. A worldwide agreement has been reached aiming at reducing or eliminating the thread of Cr(VI).…”

“…Among these technologies, adsorption is one of the most simple, scalable, effective and economical ones for removing Cr(VI) [12][13][14][15][16][17]. Some composites adsorbents, including hydrogel, modified polyaniline, magnetic nanoparticles have been developed for Cr(VI) removal [3,[18][19][20]. Nonetheless, these adsorbents still have some inherent drawbacks, such as low adsorption capacity, limited adsorption efficiency at low ion concentration, poor selectivity in complex wastewater, and troublesome regeneration and recovery of adsorbents.…”

“…By contrast, Cr(III) is one of the indispensable trace elements in mammals that can regulates insulin and blood sugar levels [21]. In aqueous solution, Cr(III) forms sparingly soluble Cr(OH) 3 or Cr 2 O 3 precipitate, and can stably exist in the sediment [22]. Many efforts have been devoted to develop advanced materials for simultaneously transferring Cr(VI) anions into Cr(III) cations and adsorbing the later from the wastewater [8,16,[23][24][25][26].…”

Some Properties of Electron Beam-Irradiated Sheep Wool Linked to Cr(III) Sorption

“…Park et al [2] examined the feasibility of hexavalent chromium removal using mackinawite (FeS)-coated sand, which completely reduced Cr(VI) to Cr(III). Dong et al [3] made poly(catechol-1,4-butanediamine)-coated Fe 3 O 4 composite capable of successfully removing Cr(VI), some part of which could be reduced partially to Cr(III). Defective porous boron nitride was successfully tested for adsorption of Cr(III)/Cr(VI) [4], and the results clarified that the strong adsorption of both ions is chemisorption, and not dispersion or electrostatic attraction.…”