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Mixed heavy metals removal from wastewater by discarded mushroom-stick biochar: adsorption properties and mechanisms

Abstract

Abstract The physicochemical, morphology properties and the sorption capacities of discarded mushroom-stick biochar (DMB) prepared under different pyrolysis temperatures from 300 °C to 800 °C were explored. Results showed that the yield and surface oxygen-containing group of DMB prepared at 300 °C (DMB3) were higher than that of DMB prepared at higher pyrolysis temperature (DMB5 and DMB8), while the DMB prepared at 800 °C (DMB8) had higher pH, mineral elements, ash content, aromaticity, and polarity. Therefore, the heavy metal adsorption capacity of DMB3 was higher than DMB5, while the maximal sorption capacities of Pb2+, Cu2+, Cd2+, and Ni2+ (21.0, 18.8, 11.2, and 9.8 mg•g−1) were obtained by DMB8. Adsorption kinetics and sorption isotherms data were fitted more well by pseudo second order and Langmuir models, thereby indicating that the heavy metal adsorption by DMB was monolayer and rapid adsorption. Based on the contribution percentage parameters of diverse heavy metal sorption mechanisms, mineral precipitation and ion exchange were the two dominant mechanisms of heavy metal adsorption by DMB. This study provided a promising way not only to recycle the discarded mushroom-sticks into feasible heavy metal adsorbents, but also for potential utilization of agriculture waste.

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Publication details

The article was received on 05 Oct 2018, accepted on 25 Jan 2019 and first published on 30 Jan 2019


Article type: Paper
DOI: 10.1039/C8EM00457A
Citation: Environ. Sci.: Processes Impacts, 2019, Accepted Manuscript

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    Mixed heavy metals removal from wastewater by discarded mushroom-stick biochar: adsorption properties and mechanisms

    X. Wang, X. Li, G. Liu, Y. He, C. Chen, X. Liu, G. Li, Y. Gu and Y. Zhao, Environ. Sci.: Processes Impacts, 2019, Accepted Manuscript , DOI: 10.1039/C8EM00457A

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