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Article

Synthesis of Magnesium Modified Biochar for Removing Copper, Lead and Cadmium in Single and Binary Systems from Aqueous Solutions: Adsorption Mechanism

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State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
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College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China
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College of Water Conservancy and Hydropower Engineering, Sichuan Agricultural University, Ya’an 625014, China
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College of Architecture and Environment, Sichuan University, Chengdu 610065, China
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Authors to whom correspondence should be addressed.
Academic Editor: Antonio Zuorro
Water 2021, 13(5), 599; https://doi.org/10.3390/w13050599
Received: 15 January 2021 / Revised: 4 February 2021 / Accepted: 22 February 2021 / Published: 25 February 2021
(This article belongs to the Section Water Quality and Contamination)
Biochar modification can enhance the properties associated with porosity and functional groups and has been identified as an effective way to improve adsorption capacity. Modified corncob biochars pretreated by different contents of MgCl2 are obtained through slow pyrolysis; then, this work explores the adsorption abilities towards heavy metals. After modification, biochars mainly impregnate carbon surface with Mg(OH)2 and MgO particles. The best mass ratio of magnesium (Mg)/feedback is 15% for modified biochar, and 15%Mg-BC has much higher (2.36–9.34 times) metal sorption capacity than pristine biochar. Batch adsorption experiments show that copper (Cu(II)) and lead (Pb(II)) on adsorbents follow a pseudo-second-order model and cadmium (Cd(II)) follows an intraparticle diffusion model. The adsorption isotherm of Cu(II) fits well with the Langmuir model, and Pb(II) and Cd(II) fit with the Freundlich model. In the binary system, modified biochar still effectively removes metals, but the sorption capacity of metals decreases rapidly because of competitive sorption. The main adsorption mechanisms of metals include surface precipitation, cation π-banding, complexation, and ion exchange. The results show that Mg-modified biochar may be an environmentally friendly material for reducing the water pollution of heavy metals. View Full-Text
Keywords: Mg-modified biochar; adsorption; heavy metals; binary system; wastewater Mg-modified biochar; adsorption; heavy metals; binary system; wastewater
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MDPI and ACS Style

Deng, Y.; Li, X.; Ni, F.; Liu, Q.; Yang, Y.; Wang, M.; Ao, T.; Chen, W. Synthesis of Magnesium Modified Biochar for Removing Copper, Lead and Cadmium in Single and Binary Systems from Aqueous Solutions: Adsorption Mechanism. Water 2021, 13, 599. https://doi.org/10.3390/w13050599

AMA Style

Deng Y, Li X, Ni F, Liu Q, Yang Y, Wang M, Ao T, Chen W. Synthesis of Magnesium Modified Biochar for Removing Copper, Lead and Cadmium in Single and Binary Systems from Aqueous Solutions: Adsorption Mechanism. Water. 2021; 13(5):599. https://doi.org/10.3390/w13050599

Chicago/Turabian Style

Deng, Yu, Xiaodong Li, Fuquan Ni, Qiao Liu, Yunpeng Yang, Min Wang, Tianqi Ao, and Wenqing Chen. 2021. "Synthesis of Magnesium Modified Biochar for Removing Copper, Lead and Cadmium in Single and Binary Systems from Aqueous Solutions: Adsorption Mechanism" Water 13, no. 5: 599. https://doi.org/10.3390/w13050599

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