التفاصيل البيبلوغرافية
| العنوان: |
Alkaline reactivity of arsenical natrojarosite |
| المؤلفون: |
Reyes,Iván A., Patiño,Francisco, Rivera,Isauro, Flores,Mizraím U., Reyes,Martín, Hernández,Juan |
| المصدر: |
Journal of the Brazilian Chemical Society v.22 n.12 2011 |
| بيانات النشر: |
Sociedade Brasileira de Química |
| سنة النشر: |
2011 |
| المجموعة: |
SciELO Brazil (Scientific Electronic Library Online) |
| مصطلحات موضوعية: |
reactivity, arsenical natrojarosite, kinetics, arsenate, decomposition, amorphous |
| الوصف: |
Jarosites are compounds that can undergo substitutions with several elements of environmental importance (such as As5+) during precipitation. Arsenic integrated in the structure could influence the solubility of the jarosite, potentially stabilizing the structure under a wide range of conditions that are tolerated by pure jarosite. Alkaline reactivity is characterized by the removal of sulfate and sodium ions from the lattice and by the formation of a gel consisting of iron hydroxides with adsorbed arsenate. The decomposition curves show an induction period, followed by a conversion period. The induction period is independent from the particle size and decreases exponentially as the temperature increases. The conversion period is characterized by the formation of a hydroxide halo around an unreacted arsenical natrojarosite core. The kinetic data are consistent with the chemical control of the process. The expression obtained in NaOH medium for [OH-] concentrations ranging from 3.84 × 10-3 to 1.08 × 10-1 mol L-1 is the following: r0/-v[1 - (1 - x)1/3] = 3.11 × 10(9) exp(-57.110/RT) [OH-]0.7 t. The expression in Ca(OH)2 medium for [OH-] concentrations ranging from 2.21 × 10-2 to 6.98 × 10-2 mol L-1 is the following: r0/-v[1 - (1 - x)1/3] = 9.22 × 10(11) exp(-48.610/RT) [OH-]1.51 t. |
| نوع الوثيقة: |
article in journal/newspaper |
| وصف الملف: |
text/html |
| اللغة: |
English |
| الإتاحة: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532011001200004Test |
| رقم الانضمام: |
edsbas.1B780D17 |
| قاعدة البيانات: |
BASE |
