3:30 PM - 5:30 PM
[PY1-11] Carrier-microencapsulation using Al-catechol complex for suppressing arsenic release from arsenopyrite
Keywords:Arsenopyrite, Acid mine drainage, Microencapsulation, Aluminum-catechol complex
Arsenopyrite (FeAsS) is the most common arsenic-bearing sulfide mineral, and its oxidation under atmospheric condition causes the release of toxic As into the environment. In this study, carrier-microencapsulation (CME) is proposed as a method to suppress arsenopyrite oxidation. In this technique, metal-organic complexes using Al3+ and catechol (1,2–dihydroxybenzene) were used to form protective coatings on arsenopyrite against oxidation.
Thermodynamic calculations and UV-vis spectroscopy confirmed that Al3+ and catechol (cat) formed three complexes, [Al(cat)+], [Al(cat)2–], and [Al(cat)33–] at different pHs. Batch leaching experiments showed that [Al(cat)+] and [Al(cat)2–] were effective to suppress As release from arsenopyrite. Scanning electron microscopy with energy dispersive X–ray spectroscopy (SEM–EDX) analyses of arsenopyrite treated by Al–based CME showed strong signals of Al and O, which indicate that Al–oxyhydroxide coatings were formed on the mineral surface.
Thermodynamic calculations and UV-vis spectroscopy confirmed that Al3+ and catechol (cat) formed three complexes, [Al(cat)+], [Al(cat)2–], and [Al(cat)33–] at different pHs. Batch leaching experiments showed that [Al(cat)+] and [Al(cat)2–] were effective to suppress As release from arsenopyrite. Scanning electron microscopy with energy dispersive X–ray spectroscopy (SEM–EDX) analyses of arsenopyrite treated by Al–based CME showed strong signals of Al and O, which indicate that Al–oxyhydroxide coatings were formed on the mineral surface.
講演PDFファイルダウンロードパスワード認証
講演集に収録された講演PDFファイルのダウンロードにはパスワードが必要です。
現在有効なパスワードは、［資源・素材学会会員専用パスワード］です。
※［資源・素材学会会員専用パスワード］は【会員マイページ】にてご確認ください。（毎年１月に変更いたします。）
［資源・素材学会会員専用パスワード］を入力してください