Lead sorptive removal using magnetic and nonmagnetic fast pyrolysis energy cane biochars

Journal of Colloid and Interface Science
Dinesh MohanCharles U Pittman

Abstract

Energy cane biochar (ECBC) was prepared in a 72 s fast pyrolysis at 425 °C in an auger-fed reactor and ground into 250-600 μm diameter particles. This biochar was magnetized by fusing an iron oxide phase to the particles by mixing aqueous biochar suspensions with aqueous Fe(3+)/Fe(2+) solutions, followed by NaOH treatment (MECBC). These biochars were characterized by Raman, FT-IR, X-ray, SEM, SEM-EDX, TEM, EDXRF, pHzpc, elemental analyses, S(BET), and magnetic moment determinations. The S(BET) of energy cane biochar was negligible and increased to 37.13 m(2)/g after Fe(3+)/Fe(2+)/NaOH magnetization. The dry biochar contains 18.4% oxygen. This allows swelling in water and permits sorption inside the solid as well as on its pore surfaces, leading to high capacities at low surface areas. Maximum lead removal occurred at pH 4-5. Sorption isotherms exhibited increasing lead removal (Q(0), mg/g) as temperature increased for nonmagnetic [Q(0)(25 °C)=45.70; Q(0)(35 °C)=52.01 and Q(0)(45 °C)=69.37] and magnetic [Q(0)(25 °C)=40.56; Q(0)(35 °C)=51.17 and Q(0)(45 °C)=51.75] biochars. Second order kinetics best fit the lead removal data. Furthermore, magnetic energy cane biochar was easily manipulated by low external magnetic field, thereby...Continue Reading

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Citations

Feb 10, 2016·Journal of Colloid and Interface Science·Shalini RajputDinesh Mohan
Jan 10, 2016·Bioresource Technology·Lukáš TrakalMichael Komárek
Sep 25, 2015·Journal of Colloid and Interface Science·Mohsen S MostafaEl-Sayed A Sultan
Aug 6, 2016·Journal of Environmental Management·Jelena T PetrovićMarija L Mihajlović
Jan 14, 2017·Environmental Science and Pollution Research International·Xiangrui KongJingge Shang
Feb 5, 2019·Environmental Science and Pollution Research International·Chen SunJianhua Yan
Nov 7, 2019·International Journal of Phytoremediation·Muhammad Bilal ShakoorJörg Rinklebe
Jul 6, 2018·Environmental Science and Pollution Research International·Guilin ZhuPing Guo
May 28, 2017·Environmental Geochemistry and Health·Youchi ZhangChao Cai
Dec 20, 2018·Environmental Science and Pollution Research International·Zhirui NiuYingying Wang
Jan 10, 2021·Journal of Hazardous Materials·Huabo GongQiaoyun Huang
Apr 19, 2021·Journal of Colloid and Interface Science·Sharifur RahmanTodd Mlsna

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