Jump to main content
Jump to site search


A new strategy to address the challenges of nanoparticles in practical water treatment: mesoporous nanocomposite beads via flash freezing

Author affiliations

Abstract

Various engineering nanoparticles (NPs) exhibit high reactivity and great potential for water decontamination. Encapsulation of NPs into millimeter-sized polymer hosts is a very promising strategy to address their inherent bottlenecks for scale-up water treatment such as aggregation, difficult operation and potential risks when released into water. However, the inevitable host pore blockage accompanying NP loadings significantly compromise their decontamination reactivity. Herein, a newly developed flash freezing method was utilized to embed α-Fe2O3 NPs (3 nm, 7 nm and 18 × 90 nm) inside millimetric polystyrene to prepare mesoporous nanocomposites Fe2O3@PS. All the as-obtained Fe2O3@PS nanocomposites feature high mesoporosity, well-dispersed NPs and highly accessible sites. The amount of Fe–OH species, i.e., the active sites for As(V) sequestration, of the embedded 3 nm-Fe2O3 is dramatically increased 3.6 times over the bare NPs, resulting in higher adsorption capacity and affinity. The 3 nm-Fe2O3@PS is capable of producing clean water 2000-fold greater in mass successively in column adsorption, with As(V) reducing from 176 μg L−1 initially to <1 μg L−1. Also, Fe2O3@PS can be readily regenerated for cyclic use with negligible NPs leaking into water. This study provides an elaborate strategy to address the trade-off between easy operation and decontamination reactivity of NPs for water treatment.

Graphical abstract: A new strategy to address the challenges of nanoparticles in practical water treatment: mesoporous nanocomposite beads via flash freezing

Back to tab navigation

Supplementary files

Publication details

The article was received on 19 Sep 2017, accepted on 15 Nov 2017 and first published on 15 Nov 2017


Article type: Paper
DOI: 10.1039/C7NR06980D
Citation: Nanoscale, 2017, Advance Article
  •   Request permissions

    A new strategy to address the challenges of nanoparticles in practical water treatment: mesoporous nanocomposite beads via flash freezing

    S. Pan, X. Zhang, J. Qian, Z. Lu, M. Hua, C. Cheng and B. Pan, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR06980D

Search articles by author

Spotlight

Advertisements