TY - JOUR
T1 - Sulfide remediation from wastewater using hydrothermally synthesized δ-MnO2/porous graphitic carbon as adsorbent
AU - Edathil, Anjali Achazhiyath
AU - Kannan, Pravin
AU - Haija, Mohammad Abu
AU - Banat, Fawzi
N1 - Funding Information:
The authors would like to gratefully acknowledge the financial support kindly provided by Khalifa University of Science and Technology under Grant No. LTR14013.
Funding Information:
The authors would like to gratefully acknowledge the financial support kindly provided by Khalifa University of Science and Technology under Grant No. LTR14013 .
Publisher Copyright:
© 2020 Elsevier Inc.
PY - 2021/5
Y1 - 2021/5
N2 - A facile hydrothermal assisted in-situ precipitation technique was employed for synthesizing highly efficient porous graphitic carbon/manganese dioxide (PGC/MnO2) nanocomposite adsorbent using calcium alginate as carbon precursor. Morphological and structural characterization using scanning electron microscopy equipped with energy dispersive X-ray spectroscopy, transmission electron microscopy, and X-ray diffraction techniques confirmed the interconnected nanoporous architecture and birnessite (δ) MnO2 polymorph evenly distributed on the PGC structure. The synergistic effect of PGC and MnO2 was exploited for enhanced sulfide removal from wastewater via adsorptive oxidation. The effect of different experimental parameters, including solution pH, initial sulfide concentration, adsorbent dosage, and contact time on removal efficiency was investigated. The equilibrium and kinetic data for sulfide adsorption by PGC/MnO2 nanocomposite fitted well with Langmuir isotherm and pseudo-second-order kinetic model, respectively. The maximum uptake capacity of sulfide by the nanocomposite was determined as 500 mg/g with complete sulfide removal. Further, it was estimated that a typical field application using the synthesized nanocomposite adsorbent would require 0.5–1 g/L per 200 mg/L of sulfide contaminated wastewater. Based on the experimental results, a schematic of the adsorptive oxidation mechanism of PGC/MnO2 nanocomposite is proposed.
AB - A facile hydrothermal assisted in-situ precipitation technique was employed for synthesizing highly efficient porous graphitic carbon/manganese dioxide (PGC/MnO2) nanocomposite adsorbent using calcium alginate as carbon precursor. Morphological and structural characterization using scanning electron microscopy equipped with energy dispersive X-ray spectroscopy, transmission electron microscopy, and X-ray diffraction techniques confirmed the interconnected nanoporous architecture and birnessite (δ) MnO2 polymorph evenly distributed on the PGC structure. The synergistic effect of PGC and MnO2 was exploited for enhanced sulfide removal from wastewater via adsorptive oxidation. The effect of different experimental parameters, including solution pH, initial sulfide concentration, adsorbent dosage, and contact time on removal efficiency was investigated. The equilibrium and kinetic data for sulfide adsorption by PGC/MnO2 nanocomposite fitted well with Langmuir isotherm and pseudo-second-order kinetic model, respectively. The maximum uptake capacity of sulfide by the nanocomposite was determined as 500 mg/g with complete sulfide removal. Further, it was estimated that a typical field application using the synthesized nanocomposite adsorbent would require 0.5–1 g/L per 200 mg/L of sulfide contaminated wastewater. Based on the experimental results, a schematic of the adsorptive oxidation mechanism of PGC/MnO2 nanocomposite is proposed.
KW - Hydrothermal treatment
KW - In-situ precipitation
KW - Manganese oxide
KW - Porous graphitic carbon
KW - Sulfide removal
UR - http://www.scopus.com/inward/record.url?scp=85096122815&partnerID=8YFLogxK
U2 - 10.1016/j.envres.2020.110429
DO - 10.1016/j.envres.2020.110429
M3 - Article
C2 - 33171121
AN - SCOPUS:85096122815
SN - 0013-9351
VL - 196
JO - Environmental Research
JF - Environmental Research
M1 - 110429
ER -