Biochar pyrolytically produced from municipal solid wastes for aqueous As(V) removal: Adsorption property and its improvement with KOH activation

Hot Temperature Time Factors Potassium Compounds Hydrogen-Ion Concentration Solid Waste Texas 01 natural sciences Arsenic Water Purification 12. Responsible consumption Kinetics Charcoal 11. Sustainability Hydroxides Adsorption Biomass Cities Porosity Water Pollutants, Chemical 0105 earth and related environmental sciences
DOI: 10.1016/j.biortech.2014.06.103 Publication Date: 2014-07-14T12:01:35Z
ABSTRACT
Biochar converted from waste products is being considered as an alternative adsorbent for removal of aqueous heavy metal(loid)s. In this work, experimental and modeling investigations were conducted to examine the effect of biochars pyrolytically produced from municipal solid wastes on removing aqueous As(V) before and after activated by 2M KOH solution. Results showed that the highest adsorption capacity of pristine biochars was 24.49 mg/g. The pseudo-second-order model and Langmuir adsorption isotherm model can preferably describe the adsorption process. The activated biochar showed enhanced As(V) adsorption ability with an adsorption capacity of 30.98 mg/g, which was more than 1.3 times of pristine biochars, and 2-10 times of modified biochars reported by other literatures. Increase of surface area and changes of porous texture, especially the functional groups on the surface of activated biochars are the major contributors to its more efficient adsorption of As(V).
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