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Graphene oxide adsorption enhanced by in situ reduction with sodium hydrosulfite to remove acridine orange from aqueous solution

Ling Sun, Hongwen Yu, Bunshi Fugetsu
Laboratory of Environmental Remediation, Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan

Received 14 October 2011; revised 24 November 2011; Accepted 25 November 2011. Available online 9 December 2011.
Abstract

Graphene oxide (GO) is a highly effective adsorbent, and its absorbing capability is further enhanced through its in situ reduction with sodium hydrosulfite as the reductant. Acridine orange is the selected target to eliminate with GO as the adsorbent. Under identical conditions, GO without the in situ reduction showed a maximum adsorption capacity of 1.4 g g−1, and GO with the in situ reduction provided a maximum adsorption capacity of 3.3 g g−1. Sodium hydrosulfite converts carbonyl groups on GO into hydroxyl groups, which function as the key sites for the adsorption enhancement.
Highlights

► An in-situ reduction method was developed to enhance the removal efficiency of graphene oxide (GO). ► Carbonyl groups on GO were in-situ converted into hydroxyl groups. ► Strong hydrogen-bonding interaction was newly introduced which had largely enhanced the removal efficiency for acridine orange by GO.s

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