Pseudo-second order model for sorption processes
TL;DR: In this paper, a literature review of the use of sorbents and biosorbents to treat polluted aqueous effluents containing dyes:organics or metal ions has been conducted.
About: This article is published in Process Biochemistry.The article was published on 1999-07-01. It has received 13746 citations till now. The article focuses on the topics: Sorption.
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TL;DR: The present review highlights the necessity for the examination of biosorbents within real situations, as competition between solutes and water quality may affect the biosorption performance.
1,584 citations
TL;DR: In this paper, the adsorption of Congo Red by coir pith carbon was carried out by varying the parameters such as agitation time, dye concentration, adsorbent dose, pH and temperature.
1,357 citations
Cites background from "Pseudo-second order model for sorpt..."
...whole range of adsorption [32,33]....
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...The second-order kinetic model [32,33] is expressed as...
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TL;DR: An overview of biochar production technologies, biochar properties, and recent advances in the removal of heavy metals, organic pollutants and other inorganic pollutants using biochar is provided.
1,301 citations
Additional excerpts
...The pseudo-secondorder kinetic model is based on the assumption that the rate-limiting step may be chemical sorption or chemisorption involving valence forces through the sharing or exchange of electrons between adsorbent and adsorbate (Ho and McKay, 1999)....
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TL;DR: The findings demonstrate the promise of porous cyclodextrin-based polymers for rapid, flow-through water treatment and outperformed a leading activated carbon for the rapid removal of a complex mixture of organic micropollutants at environmentally relevant concentrations.
Abstract: The global occurrence in water resources of organic micropollutants, such as pesticides and pharmaceuticals, has raised concerns about potential negative effects on aquatic ecosystems and human health. Activated carbons are the most widespread adsorbent materials used to remove organic pollutants from water but they have several deficiencies, including slow pollutant uptake (of the order of hours) and poor removal of many relatively hydrophilic micropollutants. Furthermore, regenerating spent activated carbon is energy intensive (requiring heating to 500-900 degrees Celsius) and does not fully restore performance. Insoluble polymers of β-cyclodextrin, an inexpensive, sustainably produced macrocycle of glucose, are likewise of interest for removing micropollutants from water by means of adsorption. β-cyclodextrin is known to encapsulate pollutants to form well-defined host-guest complexes, but until now cross-linked β-cyclodextrin polymers have had low surface areas and poor removal performance compared to conventional activated carbons. Here we crosslink β-cyclodextrin with rigid aromatic groups, providing a high-surface-area, mesoporous polymer of β-cyclodextrin. It rapidly sequesters a variety of organic micropollutants with adsorption rate constants 15 to 200 times greater than those of activated carbons and non-porous β-cyclodextrin adsorbent materials. In addition, the polymer can be regenerated several times using a mild washing procedure with no loss in performance. Finally, the polymer outperformed a leading activated carbon for the rapid removal of a complex mixture of organic micropollutants at environmentally relevant concentrations. These findings demonstrate the promise of porous cyclodextrin-based polymers for rapid, flow-through water treatment.
1,279 citations
TL;DR: Adsorption technologies are a low-cost alternative, easily used in developing countries where there is a dearth of advanced technologies, skilled personnel, and available capital, and adsorption appears to be the most broadly feasible pharmaceutical removal method.
Abstract: In the last few decades, pharmaceuticals, credited with saving millions of lives, have emerged as a new class of environmental contaminant. These compounds can have both chronic and acute harmful effects on natural flora and fauna. The presence of pharmaceutical contaminants in ground waters, surface waters (lakes, rivers, and streams), sea water, wastewater treatment plants (influents and effluents), soils, and sludges has been well doccumented. A range of methods including oxidation, photolysis, UV-degradation, nanofiltration, reverse osmosis, and adsorption has been used for their remediation from aqueous systems. Many methods have been commercially limited by toxic sludge generation, incomplete removal, high capital and operating costs, and the need for skilled operating and maintenance personnel. Adsorption technologies are a low-cost alternative, easily used in developing countries where there is a dearth of advanced technologies, skilled personnel, and available capital, and adsorption appears to be the most broadly feasible pharmaceutical removal method. Adsorption remediation methods are easily integrated with wastewater treatment plants (WWTPs). Herein, we have reviewed the literature (1990-2018) illustrating the rising environmental pharmaceutical contamination concerns as well as remediation efforts emphasizing adsorption.
1,170 citations
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01 Jan 2001
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"Pseudo-second order model for sorpt..." refers background in this paper
...Chien and Clayton [32] reported that the Elovich equation may be used to describe the kinetics of phosphate sorption in soils....
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22 Oct 2013TL;DR: The application of chemical kinetics to soil systems is discussed in this paper, where the authors present a model of Inorganic and Organic Reactions in Soils, as well as the mechanisms of Rapid Reactions on Soil Constituents using Relaxation Methods.
Abstract: Introduction. Application of Chemical Kinetics to Soil Systems. Kinetic Methodologies and Data Interpretation for Diffusion-Controlled Reactions. Kinetics and Mechanisms of Rapid Reactions on Soil Constituents Using Relaxation Methods. Ion Exchange Kinetics on Soils and Soil Constituents. Kinetics of Pesticide and Organic Pollutant Reactions. Rates of Chemical Weathering. Redox Kinetics. Kinetic Modeling of Inorganic and Organic Reactions in Soils. Bibliography. Index.
592 citations