ORIGINAL RESEARCH
Sorption of Aqueous Methylene Blue, Cadmium
and Lead onto Biochars Derived
from Scrap Papers
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1
School of Environmental Science & Engineering, Nanjing Tech University, 30 Puzhu Southern Road,
Nanjing 211816, P.R. China
2
State Key Laboratory of Analytical Chemistry for Life Science, Center of Material Analysis and School of Chemistry
and Chemical Engineering, Nanjing University, 22 Hankou Road, Nanjing 210093, P.R. China
3
Agricultural & Biological Engineering Department, University of Florida, Gainesville, FL 32611, USA
Submission date: 2019-12-08
Final revision date: 2020-03-05
Acceptance date: 2020-03-07
Online publication date: 2020-06-10
Publication date: 2020-08-05
Corresponding author
Zhuhong Ding
School of Environmental Science & Engineering, Nanjing Tech University, 30 Puzhu Southern Road, 211816, Nanjing, China
Pol. J. Environ. Stud. 2020;29(6):4409-4423
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ABSTRACT
Biochars made from scrap newspaper and book paper (NPBx and BPBx, x represents pyrolysis
temperature, ºC) were characterized and used to remove methylene blue (MB), cadmium(Cd(II)) and
lead (Pb(II)) from water solution. BPBx had higher yield, C content, and ash content and lower Ca
content than NPBx made at the same temperature. Calcite and pyrophyllite were main minerals in
NPBx and BPBx, respectively. Biochars made at higher temperature had higher pHpzc values (6.9~11.0).
The sorption kinetics of the three pollutants fit pseudo-second model well (R2 = 0.991~0.999). NPB300
and NPB450 had the largest Langmuir sorption capacity of about 23 mg g-1 for MB, while BPB600
had the capacity of 19.5 mg g-1. NPB600 had the largest Langmuir sorption capacity of 13.8 mg g-1 for
Cd(II) and 451 mg g-1 for Pb(II). Column sorption capacities were 13.2 mg g-1 (NPB300) and 9.46 mg g-1
(NPB450) for MB and 7.39 mg g-1 (NPB600) for Cd(II). De-ashed BPBx had greater sorption capacity
for MB than pristine BPBx. Deposition caused by reaction with CaCO3 was the main reason for Pb(II)
sorption by NPB600. Scrap newspaper biochars derived at high temperatures were efficient sorbents for
the removal of Pb(II).