High-performance towards removal of toxic hexavalent chromium from aqueous solution using graphene oxide-alpha cyclodextrin-polypyrrole nanocomposites

Synthesis of magnetically separable and recyclable magnetic nanoparticles decorated with β-cyclodextrin functionalized graphene oxide an excellent adsorption of As(V)/(III)

“…However, Fe 3 O 4 NPs are difficult to use in continuous flow systems (aggregation of nanoparticles) due to small particle size and instability, since magnetite is highly susceptible to oxidation when exposed to the atmosphere [11]. To overcome the drawback, several researchers have prepared magnetic NPs dispersed in aqueous and cross-linked by cyclodextrin/graphene oxide sheets [7,8]. Magnetic β-CDs-…”

“…A C C E P T E D M A N U S C R I P T 5 GO@Fe 3 O 4 NPs has a high surface area, and it is highly stable, very high adsorption capability, strong acid resistance, and also easy to separate from liquid phase, which can facilitate to the removal of various dyes and heavy metals from the environmental pollutant [7,8,[13][14][15].This is especially true for magnetic-based adsorbents that are typically most environmental friendly and cost effective [7].…”

“…β-Cyclodextrin (β-CDs) is a cyclic oligosaccharide consisting of seven a-D-glucose units connected through α-(1,4) linkages, which has a hydrophobic inner cavity and also hydrophilic exterior [7]. CD's possess a large number of hydroxyl groups which could possibly make hydrogen bonds either intra-molecularly (between the secondary and tertiary-hydroxyl groups of adjacent glucose units) or inter-molecularly (between the CD's and guest molecules).The forces that stabilize the inclusion complexes include van der Waals interactions between the hydrophilic moiety of a guest molecule and the cavity of CDs, and also hydrogen bonding between polar functional groups of a guest molecule (GO-OH, GO-COOH) and the hydroxyl group of the CD's.…”

“…CD's possess a large number of hydroxyl groups which could possibly make hydrogen bonds either intra-molecularly (between the secondary and tertiary-hydroxyl groups of adjacent glucose units) or inter-molecularly (between the CD's and guest molecules).The forces that stabilize the inclusion complexes include van der Waals interactions between the hydrophilic moiety of a guest molecule and the cavity of CDs, and also hydrogen bonding between polar functional groups of a guest molecule (GO-OH, GO-COOH) and the hydroxyl group of the CD's. The CD's molecules could selectively bind to various cationic and anionic species in their cavities to form stable host-guest inclusion complexes [7,8]. In addition, it's well documented that arsenic species can be easily make complexes with β-cyclodextrin through the polar functional groups (-OH) [3].…”

Application of chitosan-citric acid nanoparticles for removal of chromium (VI)

“…Meanwhile, other adsorbents showed higher removal efficiency. For example, Graphene oxide-␣CD-polypyrrole (GO-␣CD NC) [38], gelatin-impregnated-yeast [39] and PANI/zeolite nanocomposite [33] was used for the removal of Cr (VI) from aqueous solution, and the removal efficiency were found to be 100%. Based on data presented in Table 4, CS-CA nanoparticles can remove Cr (VI) ions from water also it is obvious that CS-CA nanoparticles showed a good affinity for binding Cr (VI) ions and desorption.…”