Chromium-Sorbed Maize Stalk Biochar and Its Power Benefited Disposal: An Effective Power Generation Method for Removal of Chromium

This study examined Cr(VI) removal efficiency of maize stalk biochar (MSB) from waste water. Equilibrium isotherm results were examined by Langmuir, Freundlich, and Temkin isotherms. The adsorption was found to fit well with the Freundlich and Temkin isotherm models, with R 2 values of 0.994 and 0.9...

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Published in:Water, air, and soil pollution air, and soil pollution, 2023-04, Vol.234 (4), p.222, Article 222
Main Authors: Dhanuskodi, Krishnaveni, Pandian, Kannan, Annamalai, Senthilkumar, Subramanian, Ponmani
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Analysis
Atmospheric Protection/Air Quality Control/Air Pollution
Biochemical fuel cells
Charcoal
Chromium
Climate Change/Climate Change Impacts
Corn
Earth and Environmental Science
Electric power generation
Electric power production
Environment
Environmental monitoring
Exothermic reactions
Fuel cells
Functional groups
Hexavalent chromium
Hydrogeology
Ions
Isotherms
Methods
Microorganisms
Removal
Soil microbiology
Soil Science & Conservation
Wastewater
Wastewater treatment
Water Quality/Water Pollution
X ray photoelectron spectroscopy
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Summary:This study examined Cr(VI) removal efficiency of maize stalk biochar (MSB) from waste water. Equilibrium isotherm results were examined by Langmuir, Freundlich, and Temkin isotherms. The adsorption was found to fit well with the Freundlich and Temkin isotherm models, with R 2 values of 0.994 and 0.909, respectively. Temkin indicates the process to be exothermic. The values of the thermodynamic parameter (∆G 0 ) suggested that the adsorption was reasonable and natural. The FT-IR bands were recorded to explore the functional groups available to bind Cr(VI) ions ) . The SEM–EDS and TEM results show the morphology of the studied adsorbent and C/O ratio present in MSB. XRD and XPS analyses of the adsorbents before and after the reaction indicate that co-precipitation occurred during adsorption. Brunauer, Emmett, and Teller (BET) were recorded for MSB to understand the nature of the surface and pore space present. Thus, MSB has the potential to remove hexavalent chromium ions from wastewater, and removal efficiency is 81%. Microbes present in the soil effectively assisted the desorption of chromium ions from MSB’s active sites with concurrent power generation of 359 mV in microbial fuel cells. Graphical Abstract
ISSN:0049-6979
1573-2932
DOI:10.1007/s11270-023-06233-8