Search

Showing total 3 results
Start Over Topic heavy metals Journal journal of hazardous materials
3 results

1. Functionalized paper—A readily accessible adsorbent for removal of dissolved heavy metal salts and nanoparticles from water.

Author

Setyono, Daisy and Valiyaveettil, Suresh

Subjects
*SORBENTS, *DISSOLUTION (Chemistry), *HEAVY metals, *SALTS, *NANOPARTICLES, *RENEWABLE natural resources, *CELLULOSE fibers, *POLYETHYLENEIMINE
Abstract

Paper, a readily available renewable resource, comprises of interwoven cellulosic fibers, which can be functionalized to develop interesting low-cost adsorbent material for water purification. In this study, polyethyleneimine (PEI)-functionalized paper was used for the removal of hazardous pollutants such as Au and Ag nanoparticles, Cr(VI) anions, Ni 2+ , Cd 2+ , and Cu 2+ cations from spiked water samples. Compared to untreated paper, the PEI-coated paper showed significant improvement in adsorption capacities toward the pollutants investigated in this study. Kinetics, isotherm models, pH, and desorption studies were carried out to study the adsorption mechanism of pollutants on the adsorbent surface. Adsorption of pollutants was better described by pseudo-second order kinetics and Langmuir isotherm model. Maximum adsorption of anionic pollutants was achieved at pH 5 while that of cations was at pH > 6. Overall, the PEI-functionalized paper showed interesting Langmuir adsorption capacities for heavy metal ions such as Cr(VI) (68 mg/g), Ni 2+ (208 mg/g), Cd 2+ (370 mg/g), and Cu 2+ (435 mg/g) ions at neutral pH. In addition, the modified paper was also used to remove Ag-citrate (79 mg/g), Ag-PVP (46 mg/g), Au-citrate (30 mg/g), Au-PVP (17 mg/g) nanoparticles from water. Desorption of NPs from the adsorbent was done by washing with 2 M HCl or thiourea solution, while heavy metal ions were desorbed using 1 M NaOH or HNO 3 solution. The modified paper retained its extraction efficiencies upon desorption of pollutants. [ABSTRACT FROM AUTHOR]

Published
2016
Full Text
View/download PDF

2. The fate of heavy metals during combustion and gasification of contaminated biomass-a brief review

Author

B. R. Stanmore, Ange Nzihou, Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement (RAPSODEE), Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), and University of Queensland [Brisbane]

Subjects
Paper, Environmental Engineering, Municipal solid waste, Contaminated biomass, 020209 energy, Health, Toxicology and Mutagenesis, Combustion, Biomass, 02 engineering and technology, 010501 environmental sciences, 01 natural sciences, 12. Responsible consumption, Arsenic, [SPI]Engineering Sciences [physics], chemistry.chemical_compound, Bioenergy, 0202 electrical engineering, electronic engineering, information engineering, Environmental Chemistry, Animals, Char, Chromated copper arsenate, Waste Management and Disposal, 0105 earth and related environmental sciences, Waste Products, Waste management, Pollution, Wood, Manure, Heavy metals, chemistry, 13. Climate action, Metals, Fly ash, Environmental science, Arsenates, Energy source, Partitioning, Sludge, Gasification
Abstract

International audience; The literature on the presence of heavy metals in contaminated wastes is reviewed. Various categories of materials produced from domestic and industrial activities are included, but municipal solid waste, which is a more complex material, is excluded. This review considers among the most abundant the following materials - wood waste including demolition wood, phytoremediation scavengers and chromated copper arsenate (CCA) timber, sludges including de-inking sludge and sewage sludge, chicken litter and spent pot liner. The partitioning of the metals in the ashes after combustion or gasification follows conventional behaviour, with most metals retained, and higher concentrations in the finer sizes due to vaporisation and recondensation. The alkali metals have been shown to catalyse the biomass conversion, particularly lithium and potassium, although other metals are active to a lesser extent. The most prevalent in biomass is potassium, which is not only inherently active, but volatilises to become finely distributed throughout the char mass. Because the metals are predominantly found in the ash, the effectiveness of their removal depends on the efficiency of the collection of particulates. The potential for disposal into soil depends on the initial concentration in the feed material.

Published
2012
Full Text
View/download PDF

3. Utilization of steel, pulp and paper industry solid residues in forest soil amendment: relevant physicochemical properties and heavy metal availability

Author

Olli Dahl, Mikko Mäkelä, Gary Watkins, Hannu Nurmesniemi, and Risto Pöykiö

Subjects
Paper, Blast furnace, Environmental Engineering, Health, Toxicology and Mutagenesis, Amendment, Biological Availability, Industrial Waste, Industrial waste, Trees, Metal, Nutrient, Metals, Heavy, Environmental Chemistry, Soil Pollutants, ta216, Waste Management and Disposal, ta215, Environmental Restoration and Remediation, Chemistry, Slag, Heavy metals, Plants, Pulp and paper industry, Pollution, Bioavailability, Steel, visual_art, visual_art.visual_art_medium
Abstract

Industrial residue application to soil was investigated by integrating granulated blast furnace or converter steel slag with residues from the pulp and paper industry in various formulations. Specimen analysis included relevant physicochemical properties, total element concentrations (HCl+HNO3 digestion, USEPA 3051) and chemical speciation of chosen heavy metals (CH3COOH, NH2OH·HCl and H2O2+H2O2+CH3COONH4, the BCR method). Produced matrices showed liming effects comparable to commercial ground limestone and included significant quantities of soluble vital nutrients. The use of converter steel slag, however, led to significant increases in the total concentrations of Cr and V. Subsequently, total Cr was attested to occur as Cr(III) by Na2CO3+NaOH digestion followed by IC UV/VIS-PCR (USEPA 3060A). Additionally, 80.6% of the total concentration of Cr (370 mg kg(-1), d.w.) occurred in the residual fraction. However, 46.0% of the total concentration of V (2470 mg kg(-1), d.w.) occurred in the easily reduced fraction indicating potential bioavailability.

Published
2010