Biochars produced from various agro-industrial by-products applied in Cr(VI) adsorption-reduction processes

This study aimed to reuse different agro-industrial by-products (poultry litter, pig manure, sewage sludge and coffee husk) for biochar production and to evaluate their Cr(VI) removal capacities in aqueous medium. The biochars showed different morphologies with porous structures. The percentages of...

Full description

Saved in:
Bibliographic Details
Published in:Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Toxic/hazardous substances & environmental engineering, 2021, Vol.56 (13), p.1387-1396
Main Authors: Penido, Evanise Silva, Oliveira, Maísa Azarias de, Sales, Alice Liberato Ribeiro, Ferrazani, Julia Costa, Magalhães, Fabiano, Bianchi, Maria Lucia, Melo, Leônidas Carrijo Azevedo
Format: Article
Language:English
Subjects:
Adsorption
Agricultural wastes
Animal wastes
Animals
Aqueous solutions
By products
Byproducts
Charcoal
Charcoal - chemistry
Chromium
Chromium - analysis
Coffee
Pig manure
Polluted environments
Pyrolysis
Reduction
Sewage sludge
Swine
waste reuse
Wastewater
Water Pollutants, Chemical - analysis
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This study aimed to reuse different agro-industrial by-products (poultry litter, pig manure, sewage sludge and coffee husk) for biochar production and to evaluate their Cr(VI) removal capacities in aqueous medium. The biochars showed different morphologies with porous structures. The percentages of Cr(VI) removal from solution were higher in acid medium (pH = 2), reaching values up to 87%. For all biochars, Cr(VI) removal occurs via both adsorption and reduction, being a rapid (30 min) process, which fits best to the pseudo-second order kinetic model. The biochars, especially from coffee husk, were able to reduce up to 20% of Cr(VI) to Cr(III). The maximum Cr(VI) removal capacities ranged from 10.86 mg g −1 (sewage sludge biochar) to 18.52 mg g −1 (coffee husk biochar). Therefore, the production of biochars from the agro-industrial by-products using the same experimental conditions in one single study is important to compare the Cr(VI) removal capacities from different biomasses. Thus, this study explored the corresponding raw material without the need of further treatment. Biochars showed potential for environmental applications considering Cr(VI)-polluted environments. It is hoped to provide basis to future studies using real wastewater samples.
ISSN:1093-4529
1532-4117
DOI:10.1080/10934529.2021.2000814