Showing papers in "Journal of Hazardous Materials in 2007"

TL;DR: Strong acids and bases seem to be the best desorbing agents to produce arsenic concentrates, and some commercial adsorbents which include resins, gels, silica, treated silica tested for arsenic removal come out to be superior.

TL;DR: Two simplified kinetic models including pseudo-first-order and pseudo-second-order equation were selected to follow the adsorption processes of methylene blue and the kinetic parameters of this best-fit model were calculated and discussed.

TL;DR: Analysis of pharmaceuticals in the effluent from a wastewater treatment plant serving about 90 bulk drug manufacturers in Patancheru, near Hyderabad, India suggests an increased focus on the potential release of active pharmaceutical ingredients from production facilities in different regions.

TL;DR: Ozonation was the oxidation process most studied, gives the best expectatives to be applied with successful results.

TL;DR: Kinetic parameters; rate constants, equilibrium adsorption capacities and related coefficients for each kinetic model were evaluated according to relative errors and correlation coefficients and results show that best fitted kinetic models are obtained to be in the order: the pseudo-first order, the Pseudo-second order and Elovich equations.

TL;DR: Adsorption isotherms modeling shows that the interaction of phenolic compounds with activated carbon surface is localized monolayer adsorption, which correlates well with respective increase in molecular weight, cross-sectional area, and hydrophobicity and decrease in solubility and pKa.

TL;DR: The percentage reduction of MO and R6G was estimated under UV/solar system and it was found that COD reduction takes place at a faster rate under solar light as compared to UV light.

TL;DR: The results demonstrate that the adsorption process was spontaneous and endothermic under natural conditions.

TL;DR: The use of orange wastes, generated in the orange juice industry, for removing cadmium from aqueous solutions has been investigated and a strong dependence of the adsorption capacity on pH was observed, the capacity increasing as pH value rose.

TL;DR: The main trend observed in the variation of the arsenic sorbed with pH is the decrease of the sorption on the three sorbents at alkaline pH values, which agrees with results found in the literature.

TL;DR: Experimental results indicated that expanded SRTs (stationary phase) can be recommended while using the fungal and bacterial Cr-resistant isolates for removing chromium and nickel from industrial wastewater.

TL;DR: Analysis of the derived gases and oils showed that pyrolysis gave a mainly aliphatic composition consisting of a series of hydrocarbons (alkanes and alkenes), with a great potential to be recycled back into the petrochemical industry as a feedstock for the production of new plastics or refined fuels.

TL;DR: The surfactant enhanced carbon regeneration (SECR) technique using both cationic and anionic surfactants is adopted for the regeneration of spent carbon by desorbing the dye and a kinetic model for dye desorption from the commercial activated carbon (CAC) is proposed.

TL;DR: DeltaH degrees, DeltaG degrees and E(a) all suggested that the adsorption of Procion Red MX-5B onto CNTs was by physisorption, more accurately represented by a pseudo second-order model.

TL;DR: The results showed that studied adsorbents can be an attractive low cost alternative for the treatment of wastewaters in batched or stirred mode reactors containing lower concentrations of chromium.

TL;DR: The results showed that under most cases Al(13) had significantly higher efficiency in removal of direct dyes than traditional Al salt and commercial PACl with the exception of Direct Red 28 removal under high pH range.

TL;DR: A novel magnetic nano-adsorbent was developed by treating Fe(3)O(4) nanoparticles with gum arabic to remove copper ions from aqueous solutions and the adsorption capacities for both MNP and GA-MNP increased with increasing the solution pH.

TL;DR: The present study illustrates the concept and provides basic thermodynamic and kinetic data for conceptual process design of hybrid conceptual processes for pre and post-combustion capture based on hydrate formation coupled with membrane separation.

TL;DR: The low detection limits of these elements in this technique make it a superior alternative to UV-vis and in several applications, also an alternative to ICP-MS techniques.

TL;DR: It is found that over the entire concentration range the adsorption on Bottom Ash takes place via particle diffusion process, while that of De-Oiled Soya undergoes via film diffusion process.

TL;DR: The calculated values for the heat of adsorption and the free energy indicate that adsorption of dyes is favored at low temperatures and the dyes are chemisorbed on activated charcoal.

TL;DR: It is concluded that natural clay can be used as an effective adsorbent for removing Cu(2+) and Zn(2+) from aqueous solutions.

TL;DR: A conceptual model for geopolymerisation is presented, allowing elucidation of the individual mechanistic steps involved in this complex and rapid process, based on the reactions known to occur in the weathering of aluminosilicate minerals under alkaline conditions.

TL;DR: The objective of this review is to provide comprehensive knowledge and information on the sensors operating on different transduction principles, ranging from electrochemical to immunosensors, being used for the detection of explosives as they pose a threat for both health and security of the nation.

TL;DR: Kinetic data correlated well with the pseudo-second-order kinetic model, indicating that the chemical sorption was the rate-limiting step and the thermodynamic study indicated that the adsorption process is spontaneous and exothermic in nature.

TL;DR: Batch adsorption of Methylene Blue and Acid Blue 25 onto ground hazelnut shells was studied in comparison with sawdust to explore the potential use of this material as low cost adsorbent for dye removal in dyehouse effluents.

TL;DR: Fluoride in drinking water above permissible levels is responsible for human and skeletal fluorosis and activated carbons prepared by one-step steam pyrolysis of rice straw were modified by liquid-phase oxidation using HNO3, H2O2 and KMnO4.

TL;DR: The results indicated that the adsorption capacity of C TS/MMT nanocomposite was higher than the mean values of those of CTS and MMT, and all the sorption processes were better fitted by pseudo-second-order equation and the Langmuir equation.

TL;DR: Three different kinds of kinetic models (i.e., intraparticular diffusion model, Lagergren-first-order and second-order equations) were used to investigate the adsorption mechanisms and it was found that the adsorbent gave good fits with Langmuir and Freundlich isotherms.

TL;DR: In this article, the authors present the state-of-the-art of dust explosion state of the art, and present the ways available to prevent dust explosion, and on cushioning the impact of a dust explosion by venting when the accident does take place.