Themed collection Removal of chromium from aqueous solutions

Despite the extensive existence of adsorbents for Cr(VI) removal from aqueous solutions, new adsorbents and modification of existing adsorbing materials are continuously sought after.

A series of micro–mesoporous activated carbons (ACs) were prepared from sugar beet residue by a two-step method including KOH chemical activation and were used for Cr(VI) removal from aqueous solutions.

Lignin/GO (LGNs) composite nanospheres were prepared by self-assembly method, which showed excellent adsorption performance for Cr(VI) removal.

The photocatalytic mechanism explains that electrons and hydroxyl radicals were responsible for reduction of Cr(VI) and oxidation of tetracycline.

Polypyrrole-based (PPy) composite are promising candidates for the treatment of water pollution.

Use of a newly synthesized Si-CPTS-AHAP adsorbent in the removal of Cr(VI) ions in wastewater treatment systems may potentially lead to low cost and highly efficient heavy metal removal.

In this study, the biosorption mechanisms of methylene blue (MB) and Cr(III) onto pomelo peel collected from our local fruits are investigated by combining experimental analysis with ab initio simulations.

A sandwiched nanocomposite has been developed to remove hexavalent chromium ion Cr(VI) from water by an adsorption–reduction mechanism.

Cellulose aerogel beads with high a density of reactive amino groups were facilely prepared via a cross-linking reaction for efficient dynamic removal of Cr(VI) from aqueous solutions.

A sulfonated magnetic graphene oxide (SMGO) hybrid was successfully synthesized via the nucleophilic substitution reaction and characterized.

A tea waste/Fe₃O₄ composite was prepared through chemical co-precipitation approach and was used for Cr(VI) removal, involving an adsorption-coupled reduction mechanism.

In this laboratory-scale experiment we report the treatment of carcinogenic Cr(VI) and 4-chlorophenol by ferromagnetic ZrO₂/Fe₃O₄ nano-heterojunctions supported on chitosan.

In this work, beta-cyclodextrin–chitosan modified walnut shell biochars (β-CCWB) were synthesized as a low-cost adsorbent for the removal of heavy metal Cr(VI) from aqueous solutions.

Magnetic materials as adsorbents can provide effective removal and quickly separate pollutants in wastewater treatment.

In this research, chitosan modification of magnetic biochar (CMB) was successfully prepared for effective removal of Cr(VI).

A new synthesis method was developed to produce zinc–biochar nanocomposites from sugarcane bagasse.

A novel electrospun chitosan/graphene oxide (GO) nanofibrous adsorbent was successfully developed by an electrospinning process.

A simple one-pot massive synthesis of highly fluorescent nitrogen-doped graphene quantum dots for the detection of Cr(VI) in aqueous media was demonstrated.

Cr(VI) can be removed fast by PANI/CF with the reduction of Cr(VI) to Cr(III) by PANI.

Polyacrylonitrile/polyaniline core/shell nanofiber was prepared, and the mechanism and applications for Cr(VI) adsorption was carefully discussed.

The behavior, mechanism and kinetics of toxic hexavalent chromium (Cr(VI)) removal by magnetic polyaniline nanocomposites from different pH solutions are reported.