A sandwich model of Cr(VI) adsorption and detoxification by Fenton modified chitosan.

Water Environment Research : a Research Publication of the Water Environment Federation
Nanzhengfang JiaYuezhong Wen

Abstract

The Fenton reaction has the advantages of short reaction time, low cost, no toxicity, and straightforward application and control. The Fenton reaction generates highly reactive HO•, which has been applied effectively. However, the effect of the generated Fe3+ has not been investigated widely. In this study, the Fenton reaction was used to improve the Cr(VI) adsorption and detoxification capacities of chitosan. After the Fenton modification, chitosan efficiently adsorbed Cr(VI) and transformed it into the less toxic Cr(III) in a wide pH range as a result of layer formation, which was described by a sandwich model. The adsorption of Cr(VI) onto the Fenton modified chitosan was in good agreement with the Freundlich adsorption model, and the adsorption capacity exceeded 120 mg/g. During the Fenton reaction, H2 O2 and HO• with high oxidative activity broke the hydrogen bonds in the chitosan structure, resulting in the release of free amine groups for Fe3+ to form metal-binding biopolymers. The distance between the chitosan polymers increased, and additional adsorption sites were created. HCrO4 - entered the gap between the chitosan polymer and was adsorbed on the newly created adsorption sites. The sandwich adsorption model indicate...Continue Reading

References

Feb 8, 2003·Journal of Hazardous Materials·Sandhya Babel, Tonni Agustiono Kurniawan
Jun 29, 2004·Journal of Colloid and Interface Science·Saeid Azizian
Sep 13, 2005·Bioresource Technology·Vikrant Sarin, K K Pant
Mar 28, 2008·Bioinorganic Chemistry and Applications·Ismael Acosta RMa de Guadalupe Moctezuma
Oct 17, 2009·Advances in Colloid and Interface Science·Amit Bhatnagar, Mika Sillanpää
Dec 24, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Rumei ChengQiangqiang Liao
Mar 24, 2010·Journal of Hazardous Materials·Ana Claudia ZimmermannClovis Antonio Rodrigues
Dec 4, 2012·Journal of Hazardous Materials·Chensi ShenWeiping Liu
Apr 30, 2013·Water Research·Rakesh N ShindeP K Pujari
Dec 19, 2017·International Journal of Biological Macromolecules·Akbar Ali, Shakeel Ahmed

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.

Related Papers

Osteoporosis International : a Journal Established As Result of Cooperation Between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA
B Dawson-HughesR Rizzoli
The American Journal of Clinical Nutrition
Eric W Manheimer
Materials Science & Engineering. C, Materials for Biological Applications
Nguyen Ngoc ThinhTran Dai Lam
© 2021 Meta ULC. All rights reserved