Ultra-trace recognition and removal of toxic chromium (VI) ions from water using visual mesocaptor

Md A. Shenashen, A. Shahat, Sherif A. El-Safty*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    56 Citations (Scopus)


    The key to designing optical mesocaptors is to construct a chromogenic receptor, namely, diphenylcarbazide (DPC), as a nanoscale platform scavenger with different functional characteristics, such as density, accessibility, and intrinsic mobility. Engineering of optical captors allows facile and reliable signaling in continuous monitoring modes, and enables simple and high-speed removal of toxic chromium (VI) ions. Mesoporous aluminosilica monoliths, with unique morphologies, active surface sites, and physical properties, enhance sensing/removal characteristics in terms of sensitivity, selectivity, and response time. The systematic design of optical mesocaptor is based on a densely patterned selective binding site (DPC) in engineered mesocylinder carriers that have multidirectional pores and microsized particle-like monoliths to control the adsorption/detection assays of Cr(VI) ions. Synthetic mesocaptor can be used for visual removal of Cr(VI) ions even at low concentration levels of 10-10M (i.e., 0.07ppb) with rapid response time in minutes. Moreover, these new classes of design-made hybrid mesocaptor exhibit long-term signaling stability and recognition functionalities that provided extraordinary sensitivity, selectivity, reusability, and fast kinetic detection and quantification of various deleterious metal ions in the environment.

    Original languageEnglish
    Pages (from-to)726-735
    Number of pages10
    JournalJournal of Hazardous Materials
    Publication statusPublished - 2013 Jan 5


    • Cr(VI) ions
    • Mesocaptors
    • Monoliths
    • Removal
    • Selectivity
    • Sensitivity
    • Visualization

    ASJC Scopus subject areas

    • Health, Toxicology and Mutagenesis
    • Pollution
    • Waste Management and Disposal
    • Environmental Chemistry
    • Environmental Engineering


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