Kinetics and Mechanisms of Sorption–Desorption in Soils: A Multiscale Assessment

Borda, Michael J.; Sparks, Donald L.

doi:10.1002/9780470175484.ch3

Cited by 22 publications

(20 citation statements)

References 75 publications

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“…165 In natural systems, sorption-desorption processes can occur over wide time scales, ranging from milliseconds to years, with lower reaction rates being due to such factors as diffusion into micropores, the existence of sites with low reactivity and surface nucleation-precipitation. 30 This is often seen in soils, although just as in simple laboratory biosorption systems, biphasic sorption kinetics may be observed with an initial 'rapid' phase being followed by a slower phase occurring over longer time periods, progressing towards equilibrium.…”

Section: Biosorption In the Environmentmentioning

confidence: 99%

“…a solid surface) resulting in an accumulation at the sorbate-sorbent interface. 30 If adsorption occurs and continues through the formation of a new three-dimensional surface species, this new species can be defined as a surface precipitate. A number of different systems clearly exist in the continuum from adsorption and precipitation.…”

Section: -Rcoomentioning

confidence: 99%

“…A number of different systems clearly exist in the continuum from adsorption and precipitation. 30 It should be noted that precipitation can occur even in simple laboratory biosorption systems depending on the substance and chemical conditions used. 25 Biosorption may be simply defined as the removal of substances from solution by biological material.…”

Section: -Rcoomentioning

confidence: 99%

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Biosorption: critical review of scientific rationale, environmental importance and significance for pollution treatment

Gadd

2008

J of Chemical Tech & Biotech

1,103

642

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Biosorption may be simply defined as the removal of substances from solution by biological material. Such substances can be organic and inorganic, and in gaseous, soluble or insoluble forms. Biosorption is a physico-chemical process and includes such mechanisms as absorption, adsorption, ion exchange, surface complexation and precipitation. Biosorption is a property of both living and dead organisms (and their components) and has been heralded as a promising biotechnology for pollutant removal from solution, and/or pollutant recovery, for a number of years, because of its efficiency, simplicity, analogous operation to conventional ion exchange technology, and availability of biomass. Most biosorption studies have carried out on microbial systems, chiefly bacteria, microalgae and fungi, and with toxic metals and radionuclides, including actinides like uranium and thorium. However, practically all biological material has an affinity for metal species and a considerable amount of other research exists with macroalgae (seaweeds) as well as plant and animal biomass, waste organic sludges, and many other wastes or derived bio-products. While most biosorption research concerns metals and related substances, including radionuclides, the term is now applied to particulates and all manner of organic substances as well. However, despite continuing dramatic increases in published research on biosorption, there has been little or no exploitation in an industrial context. This article critically reviews aspects of biosorption research regarding the benefits, disadvantages, and future potential of biosorption as an industrial process, the rationale, scope and scientific value of biosorption research, and the significance of biosorption in other waste treatment processes and in the environment.

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Section: Biosorption In the Environmentmentioning

confidence: 99%

Section: -Rcoomentioning

confidence: 99%

Section: -Rcoomentioning

confidence: 99%

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Biosorption: critical review of scientific rationale, environmental importance and significance for pollution treatment

Gadd

2008

J of Chemical Tech & Biotech

1,103

642

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“…Sorption is one of the most important reactions that influences bioavailability, and metal sorption to cells is likely to play an important role in all microbe-metal-mineral interactions (Burford et al, 2003a), taking place over a massive range of timescales from milliseconds to years (Borda & Sparks, 2008;Theng & Yuan, 2008). Metal interactions with specific cell-surface groups may also enhance or inhibit metal transport, metal transformations and biomineralization processes (Barkay & Schaefer, 2001).…”

Section: Metal Immobilizationmentioning

confidence: 99%

Metals, minerals and microbes: geomicrobiology and bioremediation

2010

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Microbes play key geoactive roles in the biosphere, particularly in the areas of element biotransformations and biogeochemical cycling, metal and mineral transformations, decomposition, bioweathering, and soil and sediment formation. All kinds of microbes, including prokaryotes and eukaryotes and their symbiotic associations with each other and 'higher organisms', can contribute actively to geological phenomena, and central to many such geomicrobial processes are transformations of metals and minerals. Microbes have a variety of properties that can effect changes in metal speciation, toxicity and mobility, as well as mineral formation or mineral dissolution or deterioration. Such mechanisms are important components of natural biogeochemical cycles for metals as well as associated elements in biomass, soil, rocks and minerals, e.g. sulfur and phosphorus, and metalloids, actinides and metal radionuclides. Apart from being important in natural biosphere processes, metal and mineral transformations can have beneficial or detrimental consequences in a human context. Bioremediation is the application of biological systems to the clean-up of organic and inorganic pollution, with bacteria and fungi being the most important organisms for reclamation, immobilization or detoxification of metallic and radionuclide pollutants. Some biominerals or metallic elements deposited by microbes have catalytic and other properties in nanoparticle, crystalline or colloidal forms, and these are relevant to the development of novel biomaterials for technological and antimicrobial purposes. On the negative side, metal and mineral transformations by microbes may result in spoilage and destruction of natural and synthetic materials, rock and mineral-based building materials (e.g. concrete), acid mine drainage and associated metal pollution, biocorrosion of metals, alloys and related substances, and adverse effects on radionuclide speciation, mobility and containment, all with immense social and economic consequences. The ubiquity and importance of microbes in biosphere processes make geomicrobiology one of the most important concepts within microbiology, and one requiring an interdisciplinary approach to define environmental and applied significance and underpin exploitation in biotechnology. Microbes as geoactive agentsMicrobes interact with metals and minerals in natural and synthetic environments, altering their physical and chemical state, with metals and minerals also able to affect microbial growth, activity and survival. In addition, many minerals are biogenic in origin, and the formation of such biominerals is of global geological and industrial significance, as well as providing important structural components for many organisms, including important microbial groups such as diatoms, foraminifera and radiolaria (Ehrlich, 1996;Gadd & Raven, 2010). Geomicrobiology can simply be defined as the roles of microbes in geological processes (Banfield & Nealson, 1997;Banfield et al., 2005; Konhauser, 2007;Ehrlich & Newman, 2009). Metalminera...

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“…Furthermore, speciation of contaminant elements may be altered under the ultra-high-vacuum conditions often required for analytical techniques like X-ray photoelectron spectroscopy and others, specially when water is present. Therefore, metal speciation in natural environments is often evaluated by indirect methods, such as selective chemical extractions (Borda and Sparks 2008;Matocha et al 2005). Although valuable in their own right, these methods are naturally limited by their indirect approach.…”

Section: Introductionmentioning

confidence: 99%

XAS study of lead speciation in a central Italy calcareous soil

Comaschi

Meneghini

Businelli

et al. 2010

Environ Sci Pollut Res

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Four components were individuated as the major responsible of Pb retention in calcareous soils: the carbonates, the metal oxide surfaces, the organic matter, and the colloidal inorganic surfaces containing clay components. The structural analysis suggests that, within these experimental conditions, the Pb adsorbed on the soil is generally present as Pb hydroxide with poor crystallization degree. However, the presence of carbonates (CaCO3) induces the co-precipitation of PbCO3-like phases with some degree of crystallinity.

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Kinetics and Mechanisms of Sorption–Desorption in Soils: A Multiscale Assessment

Cited by 22 publications

References 75 publications

Biosorption: critical review of scientific rationale, environmental importance and significance for pollution treatment

Biosorption: critical review of scientific rationale, environmental importance and significance for pollution treatment

Metals, minerals and microbes: geomicrobiology and bioremediation

XAS study of lead speciation in a central Italy calcareous soil

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