TY - JOUR
T1 - Determination of the dissolution rate of hazardous jarosites in different conditions using the shrinking core kinetic model
AU - Islas, Hernán
AU - Flores, Mizraim U.
AU - Reyes, Iván A.
AU - Juárez, Julio C.
AU - Reyes, Martín
AU - Teja, Aislinn M.
AU - Palacios, Elia G.
AU - Pandiyan, Thangarasu
AU - Aguilar-Carrillo, Javier
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/3/15
Y1 - 2020/3/15
N2 - The presence of hazardous jarosites causes a serious environmental problems, releasing potentially toxic elements, principally heavy metals such as Pb, As, Tl, Cr among others to the environment. Thus, the dissolution process of jarosites has to be monitored to assess the environmental impact. In the present work, the different hazardous jarosites were prepared, and characterized by analytical techniques (XRD, SEM, EDS, etc.), and the composition of jarosites was determined by induction-coupled plasma spectroscopy (ICP). Shrinking core kinetic model (SCKM) was employed to understand the stability of hazardous jarosites, studying a complete kinetic analysis of the jarosite dissolution process under different conditions (temperatures and pH). The results show that temperature has the highest effect on stability followed by pH, requiring extreme parameters for high dissolution. The batch experiments show that the results are in good agreement with the SCKM forming a solid layer as by-products. The chemical reaction, i.e. dissolution process performs through mostly controlling stage at extreme pH values and then moved to mass transport in the fluid layer. After analyzing the results, a kinetic equation has been proposed to describe adequately the dissolution process, and it predicts the lifetime of the hazardous jarosites.
AB - The presence of hazardous jarosites causes a serious environmental problems, releasing potentially toxic elements, principally heavy metals such as Pb, As, Tl, Cr among others to the environment. Thus, the dissolution process of jarosites has to be monitored to assess the environmental impact. In the present work, the different hazardous jarosites were prepared, and characterized by analytical techniques (XRD, SEM, EDS, etc.), and the composition of jarosites was determined by induction-coupled plasma spectroscopy (ICP). Shrinking core kinetic model (SCKM) was employed to understand the stability of hazardous jarosites, studying a complete kinetic analysis of the jarosite dissolution process under different conditions (temperatures and pH). The results show that temperature has the highest effect on stability followed by pH, requiring extreme parameters for high dissolution. The batch experiments show that the results are in good agreement with the SCKM forming a solid layer as by-products. The chemical reaction, i.e. dissolution process performs through mostly controlling stage at extreme pH values and then moved to mass transport in the fluid layer. After analyzing the results, a kinetic equation has been proposed to describe adequately the dissolution process, and it predicts the lifetime of the hazardous jarosites.
KW - Dissolution rates
KW - Hazardous jarosite
KW - Jarosite lifetime
KW - Kinetic analysis
KW - Shrinking core kinetic model
UR - http://www.scopus.com/inward/record.url?scp=85078294666&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2019.121664
DO - 10.1016/j.jhazmat.2019.121664
M3 - Artículo
C2 - 31791859
SN - 0304-3894
VL - 386
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 121664
ER -