Author(s)

Adriana Medina Ramírez, Prócoro Gamero Melo, José Manuel Almanza Robles, María Esther Sánchez Castro, Sasirot Khamkure, Roberto García de León

1Sustainability of the Natural Resources and Energy, CINVESTAV Saltillo, Ramos Arizpe, Mexico 2Nanotechnology Engineering, University of La Ciénega of the Michoacan State, Sahuayo, Mexico.
Sustainability of the Natural Resources and Energy, CINVESTAV Saltillo, Ramos Arizpe, Mexico.
Transformation Processes, Mexican Petroleum Institute, Mexico City, Mexico.

In the “Laguna” region of Coahuila state, Mexico like other places in the world, the groundwater needs to be treated to meet the quality required for human consumption. The study had probed that a Mexican fly ash can be used as a raw material to obtain effective low cost adsorbents for drinking water treatment, as well evaluated the effects of pH, ion coexistence, dose, arsenic (As) concentration and temperature on the As(V) uptake by using P and W modified zeolites (PMOD and WMOD) obtained from a Mexican fly ash. The As(V) adsorption capacity of the WMOD zeolite was not affected by pH and As(V) concentrations in aqueous solution was achieved <0.01 mg/L in the studied pH range; however, the As(V) removal by using PMOD zeolite decreased at high pH values. Carbonate concentration had a negative effect on the As(V) uptake of both zeolites but this effect was higher for the PMOD zeolite. The maximum adsorption capacities (Qmax) were 76.11 and 44.44 mg of As(V)/g of zeolite for the WMOD and the PMOD zeolites, respectively. The adsorption process was endothermic, spontaneous and occurred by chemical exchange. The experimental data were best interpreted by a pseudo-second order kinetic model. The WMOD zeolite showed a higher adsorption capacity and rate than the PMOD even at the highest evaluated As(V) concentration. The adsorption capacity of the regenerated WMOD zeolite was similar to the original zeolite. Because of the high As(V) adsorption capacity, chemical stability and regenerability, the WMOD zeolite is potentially useful as low-cost adsorbent for As(V) removal from aqueous effluents.

Fly Ash; Zeolite; Arsenic (V) Removal; Adsorbent Regeneration

Ramírez, A. , Melo, P. , Robles, J. , Castro, M. , Khamkure, S. and León, R. (2013) Kinetic and Thermodynamic Study of Arsenic (V) Adsorption on P and W Aluminum Functionalized Zeolites and Its Regeneration. Journal of Water Resource and Protection, 5, 58-67. doi: 10.4236/jwarp.2013.58A009.