2020/12/15 by Samuel Darko, Gurcan Comert, Darko, Samuel +5
Chemistry · Environmental Science · #Electrostatics and Colloid Interactions #Water Quality Monitoring and Analysis #Adsorption and biosorption for pollutant removal
paper · pdf · doi:10.48550/arxiv.2101.03137
We report herein, the potential of raw pinecone powder (PCP) and pinecone\nbiochar (PCBC) as alternatives to activated carbon used in Permeable Adsorptive\nBarriers (PABs) for the in situ remediation of polluted groundwater. A\nconstructed lab-scale unconfined aquifer (38\×30\×17 cm) fitted\nwith PCP and PCBC PABs (21\×3\×20 cm), was evaluated for the\nremoval of Pb2+ ions in a continuous flow setup. Results indicate that\nafter 3600 minutes, PCP was able to reduce Pb2+ ions from a Co=50\nmg/L to 7.94 mg/L for the first run and 19.4 mg/L for a second run,\nrespectively. Comparatively, PCBC reached 6.5 mg/L for the first run and\n8.94 for the second run. It was confirmed that adsorption was best described\nby the first-order kinetic model with R2 values above 0.95. Maximum\nadsorption capacity values were found to be 1.00, 0.63, 1.08, and 0.85\nmg/g for each scenario respectively. In addition, nonlinear regression models\nof exponential and Gaussian Processes are fit to explain remediation by time\nfor Pb2+ and Methylene Blue. Gaussian Processes are able to better explain\nthe variation of pollution removal compared to simpler exponential models. When\nregressed against true removal percentages all models are able to provide\nR2>0.99.\n