Industrial & Engineering Chemistry Research · 2018 · 32 citations · 39 references
EngineeringChemical EngineeringEnvironmental EngineeringEnvironmental ChemistryEnvironmental RemediationSolid Waste ManagementAdsorption ProcessesHeavy Metal RemediationHeavy Metal RemovalOrganic Contaminant RemovalWaste IncinerationWaste TreatmentAdsorption CapacityAdsorption RemediationAdsorption-based RemediationHydrochloric Acid RemovalPowder Diffraction AnalysisRemoval EfficiencyThermogravimetric CurvesThermogravimetric Data Analysis
The high level of HCl generated from municipal solid-waste incinerators at 350–650 °C is considered a primary chlorine source for emitted toxic polychlorinated dibenzodioxins and polychlorinated dibenzofurans. Herein, calcium (Ca) and zinc (Zn) hydrotalcite-like compounds (HTLs) were prepared to remove HCl at different reaction temperatures and initial HCl concentrations. The mechanism of the adsorption of HCl by the HTLs and calcined HTLs (HTOs) was investigated using thermogravimetric analysis, X-ray powder diffraction, scanning electron microscopy, and surface-area measurements. The Ca- and Zn-HTLs had similar structures and physicochemical properties. Both sorbents had good adsorption capacities for HCl that exceeded 90% over 456 min at 550 °C in an HCl concentration of 750 mg/g. The adsorption capacity of Zn-HTOs was better than that of Ca-HTOs at 350 °C. The removal efficiency of Ca-HTLs was higher than that of Zn-HTLs at temperatures above 550 °C. The Freundlich isotherm provided a good fit to the experimental data for the HTLs.
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