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Full-Text Articles in Engineering
Strategic Selection Of An Optimal Sorbent Mixture For In-Situ Remediation Of Heavy Metal Contaminated Sediments: Framework And Case Study, Yi Wai Chiang, Rafael M. Santos, Karel Ghyselbrecht, Valérie Cappuyns, Johan A. Martens, Rudy Swennen, Tom Van Gerven, Boudewijn Meesschaert
Strategic Selection Of An Optimal Sorbent Mixture For In-Situ Remediation Of Heavy Metal Contaminated Sediments: Framework And Case Study, Yi Wai Chiang, Rafael M. Santos, Karel Ghyselbrecht, Valérie Cappuyns, Johan A. Martens, Rudy Swennen, Tom Van Gerven, Boudewijn Meesschaert
Faculty Publications and Scholarship
Aquatic sediments contaminated with heavy metals originating from mining and metallurgical activities of aquatic sediments poses significant risk to the environment and human health due to the fact that these sediments not only act as a sink for heavy metals, but can also constitute a secondary source of heavy metal contamination. A variety of sorbent materials has demonstrated the potential to immobilize heavy metals. However, the complexity of multi-element contamination makes choosing the appropriate sorbent mixture and application dosage highly challenging. In this paper, a strategic framework is designed to systematically address the development of an in-situ sediment remediation solution …
Adsorption Of Multi-Heavy Metals Onto Water Treatment Residuals: Sorption Capacities And Applications, Yi Wai Chiang, Karel Ghyselbrecht, Rafael M. Santos, Johan A. Martens, Rudy Swennen, Valérie Cappuyns, Boudewijn Meesschaert
Adsorption Of Multi-Heavy Metals Onto Water Treatment Residuals: Sorption Capacities And Applications, Yi Wai Chiang, Karel Ghyselbrecht, Rafael M. Santos, Johan A. Martens, Rudy Swennen, Valérie Cappuyns, Boudewijn Meesschaert
Faculty Publications and Scholarship
Inherently formed iron-based water treatment residuals (WTRs) were tested as alternative sorbents for multi-heavy metal removal from synthetic solutions, contaminated sediments, and surface waters. The WTRs were mainly composed of iron (hydr)oxides and had a high BET surface area (170.7 m2/g), due to the presence of micro- and mesopores. The sorption capacity of WTRs for As(V), Cd2+, Pb2+ and Zn2+ from synthetic solutions surpassed that of a commercially available goethite by 100-400% for single contaminant tests, and by 240% for total sorption in multi contaminant tests. The maximum sorption capacity of WTRs towards As(V), …
Synthesis Of Zeolitic-Type Adsorbent Materials From Municipal Solid Waste Incinerator Bottom Ash And Its Application In Heavy Metal Adsorption, Yi Wai Chiang, Karel Ghyselbrecht, Rafael M. Santos, Boudewijn D. Meesschaert, Johan A. Martens
Synthesis Of Zeolitic-Type Adsorbent Materials From Municipal Solid Waste Incinerator Bottom Ash And Its Application In Heavy Metal Adsorption, Yi Wai Chiang, Karel Ghyselbrecht, Rafael M. Santos, Boudewijn D. Meesschaert, Johan A. Martens
Faculty Publications and Scholarship
Municipal solid waste incinerator (MSWI) bottom ash (BA) was converted to zeolitic-type adsorbent materials by hydrothermal conversion under strongly alkaline conditions. The conversion product was determined to be a mixture of sodium aluminum silicate hydrate (SASH) (Na2O·Al2O3·1.68SiO2·1.73H2O) and tobermorite (Ca5Si6O16(OH)2·4H2O). The BET specific surface area was 22.1 m2/g, which represented a significant gain compared to the BA (4.6 m2/g) due to the formation of micropores and mesopores. The converted BA demonstrated promising performance for application as a sorbent towards several heavy metals (oxyanions of As(V), and Cd2+, Co2+, Ni2+, Pb2+, and Zn2+). Its performance was found to be generally superior …
Electrochemical Filtering Of Co From Fuel-Cell Reformate, Balasubramanian Lakshmanan, Wayne Huang, John W. Weidner
Electrochemical Filtering Of Co From Fuel-Cell Reformate, Balasubramanian Lakshmanan, Wayne Huang, John W. Weidner
John W Weidner
A proton exchange membrane fuel cell was used as a flow reactor for continuous preferential oxidation of CO over H2 from 1.0% CO in H2 under pulse-potential control. By varying the pulse profile ~e.g., on-time, off-time, pulse potential! the CO and H2 oxidation currents were varied independently. The improvement in faradaic selectivity between CO and H2 oxidation results from the promotion of CO adsorption during the off ~i.e., open-circuit! portion of the pulse. Therefore, during the on portion CO oxidation was preferred while the surface was covered with CO.
Optimizing The Removal Of Fluoride From Water Using New Carbons Obtained By Modification Of Nut Shell With A Calcium Solution From Egg Shell, Virginia Hernandez-Montoya, Luis A. Ramirez-Montoya, Adrian Bonilla-Petriciolet, Miguel A. Montes-Moran
Optimizing The Removal Of Fluoride From Water Using New Carbons Obtained By Modification Of Nut Shell With A Calcium Solution From Egg Shell, Virginia Hernandez-Montoya, Luis A. Ramirez-Montoya, Adrian Bonilla-Petriciolet, Miguel A. Montes-Moran
Adrian Bonilla-Petriciolet
Carbons loaded with specific chemical moieties were prepared from pecan nut shells employing a natural modifier agent obtained from egg shell, which is rich in calcium, for the selective adsorption of fluoride from water. A L4 orthogonal array of the Taguchi method was used to optimize the synthesis conditions for obtaining these selective carbons. The samples obtained were characterized and the elemental composition, textural parameters and morphology were determined. Fluoride adsorption experiments were performed in synthetic and real groundwater samples. Results showed that carbons obtained from pecan nut shells modified with a calcium solution extracted from egg shells (CMPNS) were …