Article

Applications of chitin- and chitosan-derivatives for the detoxification of water and wastewater—a short review. Adv Colloid Interf Sci

Laboratory of Applied Environmental Chemistry, Department of Environmental Sciences, University of Kuopio, FI-50100 Mikkeli, Finland.
Advances in Colloid and Interface Science (Impact Factor: 7.78). 11/2009; 152(1-2):26-38. DOI: 10.1016/j.cis.2009.09.003
Source: PubMed

ABSTRACT

Chitin and chitosan-derivatives have gained wide attention as effective biosorbents due to low cost and high contents of amino and hydroxyl functional groups which show significant adsorption potential for the removal of various aquatic pollutants. In this review, an extensive list of chitin- and chitosan-derivatives from vast literature has been compiled and their adsorption capacities for various aquatic pollutants as available in the literature are presented. This paper will give an overview of the principal results obtained during the treatment of water and wastewater utilizing chitin and chitosan-derivatives for the removal of: (a) metal cations and metal anions; (b) radionuclides; (c) different classes of dyes; (d) phenol and substituted phenols; (e) different anions and other miscellaneous pollutants. The review provides a summary of recent information obtained using batch studies and deals with the various adsorption mechanisms involved. It is evident from the literature survey that chitin- and chitosan-derivatives have shown good potential for the removal of various aquatic pollutants. However, still there is a need to find out the practical utility of such developed adsorbents on commercial scale.

Download full-text

Full-text

Available from: Mika Sillanpää
  • Source
    • "Therefore, there is a need for more environmentally friendly, green and nontoxic surfactants for oil-spill treatment that could replace the currently used hazardous chemicals and offer a feasible , efficient and sustainable oil-spill treatment method for the arctic environment. Naturally occurring biopolymer chitosan derived from the shells of crustaceans has been studied for variety of applications since it is abundant, biocompatible, biodegradable, and nontoxic [7,8]. There are a number of applications for chitosan in biomaterials for tissue engineering and drug delivery in nanoparticles. "
    [Show abstract] [Hide abstract]
    ABSTRACT: The melting of the permanent ice cover in the arctic region due to the climate change is increasing industrial activity in the region and also consequently there is the enhanced risk for oil-spills. Therefore, there is a need for the development of green chemicals for oil-spill treatment in the arctic region. Carboxymethylated chitosan nanoparticles were cross-linked with Mg, Ca or Sr and the stability of nanoparticles in increased pH and salinity was studied. The carboxymethylation of chitosan was investigated with FTIR and the nanoparticles were studied with dynamic light scattering and SEM. The nanoparticles cross-linked with Ca ions were found to be most stable in increased salinity and pH. The interaction of Ca cross-linked nanoparticles with dodecane in water was also demonstrated. The nanoparticles showed promising potential for applications in oil-spill treatment.
    Full-text · Article · Jan 2016 · Colloids and Surfaces A Physicochemical and Engineering Aspects
  • Source
    • "These nitrites transform hemoglobin to methemoglobin by oxidation of ferrous iron (Fe 2+ ) in hemoglobin to ferric form (Fe 3+ ), preventing or reducing the ability of blood to transport oxygen, which causes cyanosis and anoxemia [10]. Although nitrate could be removed from aquatic systems by different methods such as adsorption [11], catalytic reduction using monometallic particles [12] or bimetallic particles [13], and photocatalytic reduction [14], the search for a cost-effective method to remove nitrate from groundwater is a crucial issue for the health of the aqueous environment. "
    [Show abstract] [Hide abstract]
    ABSTRACT: In this manuscript, zero-valent iron nanoparticles (ZVINPs) were synthesized, and then supported on high surface area nanographenes (NGs) to prepare a stable ZVINP/NG nanocomposite. XRD measurements showed the stabilization of the ZVINPs upon their support on NGs, which enhanced their activity. The ZVINP/NG nanocomposite was used for the catalytic reduction of nitrate ions in model solution, and the results showed the dependency of the removal process on the ratio of ZVINPs to NGs in the nanocomposite, time of removal, and solution pH. The effect of ultrasonication was also explored, and the results showed that ultrasonication could significantly decrease the removal time required by the nanocomposite. The mechanism of nitrate reduction by ZVINP/NG nanocomposite was studied, and the results showed the conversion of nitrate to nitrite and/or ammonia, then to nitrogen gas.
    Full-text · Article · Dec 2015 · Journal of Molecular Liquids
  • Source
    • "In its natural form chitin is not very useful; however, its deacetylated derivative called chitosan can have many applications [16]. Chitosan and its derivatives have been reported to be suitable for purification of water and wastewater [17]. Chitosan has high adsorption capacity for metal ions because of its ability to form chelate compounds. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Industrial processes are responsible for heavy metal releases into the environment. Removal of excessive heavy metals has become a major concern, therefore, new economical and efficient methods of water treatment are now being explored. The experiments described in this paper relate to the removal of heavy metal cations from water. The adsorption process was carried out in a packed column containing foamed chitosan. Initially, a method of production of the foamed structure was developed. Subsequently, the foamed structure was properly prepared for testing. The adsorption process was continuous with constant ion concentration at the column inlet. Parameters such as sorption capacity of the chitosan bed, as well as influence of the initial ion concentration and feed flow rate were investigated. The Bohart–Adams model was used to describe the sorption dynamics.
    Full-text · Article · Aug 2015 · Desalination and water treatment
Show more