Showing papers in "Journal of Hazardous Materials in 2006"

TL;DR: An overview of second-order kinetic expressions is described in this paper based on the solid adsorption capacity, which shows that a pseudo-second-order rate expression has been widely applied to the Adsorption of pollutants from aqueous solutions onto adsorbents.

TL;DR: The sorption capacities of commercial developed carbons and other low cost sorbents for chromium remediation are provided, and particular attention is paid to comparing the sorption efficiency and capacities of commercially available activated carbons to otherLow cost alternatives.

TL;DR: It has been concluded that the selection of treatment process should be site specific as per local needs and prevailing conditions as each technology has some limitations and no one process can serve the purpose in diverse conditions.

TL;DR: A rate equation for the degradation based on Langmuir-Hinshelwood (L-H) model has been proposed and results show that the adsorption constant and rate constant in L-H model are dependent to the light intensity, and increase with increasing the lightintensity.

TL;DR: The error analysis demonstrated that the three-parameter models better described the nickel biosorption data compared to two-parameters models, and Toth equation provided the best model for nickel biosOrption data at all pH conditions examined.

TL;DR: None of the individual physico-chemical techniques is universally applicable or highly effective for the removal of recalcitrant compounds from stabilized leachate, but adsorption, membrane filtration and chemical precipitation are the most frequently applied and studied worldwide.

TL;DR: The findings in this study shows that an increase in the current density up to 60-80 A m(-2) enhanced the color removal efficiency, the electrolysis time was 5 min and the range of pH was determined between 5.5 and 8.5 for two mentioned dye solutions.

TL;DR: RHA was found to be an effective adsorbent for the removal of cadmium (Cd(II), nickel (Ni(II) and zinc (Zn(II)) metal ions from aqueous solutions and kinetics showed that the metal ions adsorption on RHA is a gradual process with quasi-equilibrium being attained in 5h.

TL;DR: It was observed that chelating effect is also playing an important role in the adsorption of metal ions onto sporopollenin, and advertisersorption mechanism for the adsorbent was explained as an ion-exchange process.

TL;DR: It was found that the pseudo-second-order mechanism is predominant and the overall rate of the dye adsorption process appears to be controlled by the more than one-step.

TL;DR: The technical feasibility of utilisation of fly ash as a low-cost adsorbent for various adsorption processes for removal of pollutants in air and water systems has been reviewed and Investigations revealed that unburned carbon component in fly ash plays an important role in adsorptive capacity.

TL;DR: The conventional laboratory based techniques, like precipitation with alum, iron, Fe/Mn, lime softening, reverse osmosis, electro dialysis, ion exchanges, adsorption on activated alumina/carbon, etc., for arsenic removal from contaminated water are discussed.

TL;DR: Cedar sawdust and crushed brick can be attractive options for dye removal from dilute industrial effluents and are indicated to be effective adsorption mechanisms.

TL;DR: Activated carbon prepared from Ceiba pentandra hulls for the removal of copper and cadmium from aqueous solutions has been studied and sorption kinetics have been analysed by Lagergren pseudo-first-order and pseudo-second-order kinetic models.

TL;DR: The obtained results suggest a surface initiated reaction involving Msurf2+ (Fe, Co or Mn), producing HO radicals, which can lead to two competitive reactions, i.e. the decomposition of H2O2 or the oxidation of organics present in the aqueous medium.

TL;DR: The photocatalytic activity of Fe-doped TiO(2) powders prepared by this method and calcined at 400 degrees C exceeded that of Degussa P25 (P25) by a factor of more than two times at an optimal atomic ratio of Fe to Ti of 0.25.

TL;DR: The sorption capacity of activated carbon (ATFAC) and activated carbon fabric cloth is comparable to many other adsorbents/carbons/biosorbents utilized for the removal of trivalent chromium from water/wastewater.

TL;DR: Langmiur and Frumkin equation is found to best represent the equilibrium data for three dye-WA11Zn5 systems and the isotherm constant were evaluated depending on temperature.

TL;DR: The waste pomace of olive oil factory (WPOOF) was tested for its ability to remove chromium(VI) from aqueous solution by batch and column experiments and the Adams-Bohart model were used to analyze the experimental data and the model parameters were evaluated.

TL;DR: The effect of different waste stream such as heavy metals bearing sludge, filter cake, fly ash, and slag on the properties of cement and other binders is summarized.

TL;DR: Electrocoagulation was more effectively removed by electrochemical treatment, whereas Ni was easily removed by chemical treatment, which was up to five times lower than that recorded using chemical precipitation.

TL;DR: The SMH being a natural, eco-friendly and low-cost adsorbent with relatively large adsorption capacity might be a suitable local alternative for elimination of dyes from colored aqueous solutions.

TL;DR: Investigation showed that it is inappropriate to use a type 1 and type pseudo second-order expressions as proposed by Ho and Blanachard et al. respectively for predicting the kinetic rate constants and the initial sorption rate for the studied system.

TL;DR: An Australian natural zeolite was collected, characterised and employed for basic dye adsorption in aqueous solution and it was found that the regenerated zeolites by high-temperature calcination and Fenton oxidation showed similar advertisersorption capacity but lower than the fresh sample.

TL;DR: The high M/G ratio of alginate extracted from this algal species is most likely the determining factor for the increased adsorption capacity of the investigated metals, indicating that the mannuronic acid is responsible for the ion exchange mechanism.

TL;DR: The batch sorption model, based on a pseudo-second-order mechanism, was applied to predict the rate constant of sorption, the equilibrium capacity and the initial sorption rate with the effects of the initial solution pH and fiber dose.

TL;DR: From the results obtained it seems that other mechanisms, such as surface complexation and electrostatic interactions, must be involved in the metal sorption in addition to ion exchange.

TL;DR: The wastewater treatment plant that employs Fenton oxidation followed by aerobic degradation in sequencing batch reactors (SBR), built after these treatability studies provided an overall COD removal efficiency of 98%, and compliance with the discharge limits.

TL;DR: It is significant to recycle WEEE sufficiently to comply with regulations regarding WEEE management, and to implement green design and cleaner production concepts within the electronics industry to compliant with the upcoming EU and China legislation in a proactive manner.

TL;DR: It was found that the sufficient time to attain equilibrium was 90 min and the Langmuir isotherms was the best-fit adsorption isotherm model for the experimental data obtained from the non-linear chi-square statistic test.