Preparation and performance of arsenate (V) adsorbents derived from concrete wastes

Takeshi Sasaki, Atsushi Iizuka, Masayuki Watanabe, Teruhisa Hongo, Akihiro Yamasaki

    Research output: Contribution to journalArticlepeer-review

    38 Citations (Scopus)

    Abstract

    Solid adsorbent materials, prepared from waste cement powder and concrete sludge were assessed for removal of arsenic in the form of arsenic (As(V)) from water. All the materials exhibited arsenic removal capacity when added to distilled water containing 10-700mg/L arsenic. The arsenic removal isotherms were expressed by the Langmuir type equations, and the highest removal capacity was observed for the adsorbent prepared from concrete sludge with heat treatment at 105°C, the maximum removal capacity being 175mg-As(V)/g. Based on changes in arsenic and calcium ion concentrations, and solution pH, the removal mechanism for arsenic was considered to involve the precipitation of calcium arsenate, Ca3(AsO4)2. The enhanced removal of arsenic for the adsorbent prepared from concrete sludge with heat treatment was thought to reflect ion exchange by ettringite. The prepared adsorbents, derived from waste cement and concrete using simple procedures, may offer a cost effective approach for arsenic removal and clean-up of contaminated waters, especially in developing countries.

    Original languageEnglish
    Pages (from-to)1829-1835
    Number of pages7
    JournalWaste Management
    Volume34
    Issue number10
    DOIs
    Publication statusPublished - 2014 Oct 1

    Keywords

    • Adsorption
    • Arsenate removal
    • Waste cement
    • Waste concrete
    • Water pollution

    ASJC Scopus subject areas

    • Waste Management and Disposal

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