Stabilization of Cr(VI) from fine ferrochrome dust using exfoliated vermiculite

Journal of Hazardous Materials
Delphin Mulange Wa Mulange, Andrie Mariana Garbers-Craig

Abstract

This study proved that vermiculite, a natural occurring mineral, can effectively remove and stabilize Cr(VI) from fine ferrochrome dust leachate. Batch adsorption studies were carried out to determine the effect of pH, contact time and adsorbent dose on the removal of Cr(VI). The process was found to be highly pH dependent. The optimum conditions for the Cr(VI) removal are at a pH of 1.5, contact time of 2h and adsorbent dose of 10gL(-1). The stability of the Cr(VI)-loaded vermiculite remained unchanged after 12 months, when the vermiculite was evaluated with the ASTM and TCLP Cr(VI) leach methods. However, Cr(VI) desorption did take place when the Acid Rain Test was used. The adsorption kinetic data fits the pseudo-second order model, while the equilibrium data of Cr(VI) adsorption onto vermiculite are best described by the Langmuir isotherm. The presence of hydrobiotite and biotite in the industrial vermiculite slightly decreased the degree of adsorption of Cr(VI).

References

May 1, 1991·Environmental Health Perspectives·C D Palmer, P R Wittbrodt
Aug 1, 1997·Regulatory Toxicology and Pharmacology : RTP·J Barnhart
Aug 16, 2000·Journal of Colloid and Interface Science·B S Krishna Jai Prakash BS
Oct 31, 2002·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Jung-Yoon Choi, Dong-Su Kim
Feb 8, 2003·Journal of Hazardous Materials·Sandhya Babel, Tonni Agustiono Kurniawan
Mar 31, 2005·Journal of Colloid and Interface Science·Maria G da FonsecaClaudio Airoldi
May 26, 2005·Journal of Hazardous Materials·Lotfi Khezami, Richard Capart
Mar 15, 2006·Journal of Hazardous Materials·Maria G da FonsecaLuiza N H Arakaki
Nov 3, 2006·Journal of Hazardous Materials·Ahmet SariMustafa Soylak
Mar 6, 2007·Bioresource Technology·Lei Yang, J Paul Chen
May 22, 2007·Journal of Hazardous Materials·Muradiye Uysal, Irfan Ar
Jul 28, 2007·Journal of Hazardous Materials·Y C SharmaC H Weng
Dec 9, 2008·Journal of Hazardous Materials·Guangren QianQiang Liu
Jun 26, 2009·Journal of Hazardous Materials·D Nityanandi, C V Subbhuraam

❮ 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.