Hydraulic fracturing generates wastewater ranging from 2 to 8.5 million gallons per well. Suspended solids, total dissolved solids, hydrocarbons, organic compounds, and heavy metals are some of the common contaminants present in the fracking wastewater. In this work, pecan shell-based activated carbon (PSBAC) was prepared, characterized, and applied for the removal of Ba (II), Fe (II), and Sr (II) from synthetic fracking wastewater. The PSBAC had a high specific surface area of 1516 m2/g and pore volume of 0.8 cm 3/g. The effects of initial adsorbate concentration, adsorbent dose, and temperature were investigated, and an optimum condition for the present adsorption system was identified. Results showed that the Langmuir model best fit the adsorption systems with the PSBAC having maximum adsorptive capacity of 3.33 mg/g for Ba (II), 41.66 mg/g for Fe (II), and 8.8 mg/g for Sr (II). Kinetic studies revealed that sorption of the metals was not limited by intra-particle diffusion. The pseudo-second order kinetic model had the best fit, indicating chemisoprtion is the rate limiting step. The adsorption process was thermodynamically favorable and endothermic in nature.
|Advisor:||Subramaniam, Ramalingam, Gang, Daniel D.|
|Commitee:||Depan, Dilip, Revellame, Emmanuel|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 58/05M(E), Masters Abstracts International|
|Subjects:||Engineering, Chemical engineering|
|Keywords:||Adsorption, Barium, Iron, Isotherm, Kinetics, Pecan shells|
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