Abstract:
:Palygorskite is a mineral widely applied for the removal of potentially toxic trace elements from the environment. This study aimed to identify the influence of pH (3, 4, 5, and 6) and humic acid (200 mg L-1) addition on the adsorption of hexavalent chromium (Cr (VI)) ions by the microparticles and nanoparticles of palygorskite. Therefore, the mineral was prepared as the micron- and nano-sized particles saturated with Ba2+ ions, and finally used in adsorption experiments. The results indicated that regardless of the mineral size, Cr(VI) adsorption was enhanced by increasing the contact time from 5 to 2880 min and the equilibrium conditions achieved after 1440 min from the beginning of experiments. With increasing the pH values from 3 to 6, the adsorption efficiency of Cr(VI) decreased significantly, and the highest rate of removal (64%) was found at pH = 3. The pseudo-second-order model best described the kinetics of Cr(VI) adsorption onto both micro- and nanoparticles of palygorskite. Also, the experimental data showed maximum consistency with the data calculated by the Freundlich isotherm model. The two processes of film and pore diffusion were recognized as the main mechanisms that controlled the adsorption of Cr(VI) by palygorskite microparticles and nanoparticles. A comparison of the maximum adsorption capacity of Cr(VI) in different treatments followed the order of nanoparticles > humic acid > humic acid + nanoparticles ≈ humic acid + microparticles > microparticles. Accordingly, the adsorption capacities of "palygorskite nanoparticles" and "humic acid" for Cr(VI) ions were 3.7 and 3.2 times higher than that of palygorskite microparticles, respectively. Moreover, the adsorption capacities observed in the simultaneous application of humic acid with palygorskite microparticles and nanoparticles were 20% and 45% lower than those without humic acid, respectively. To conclude, palygorskite nanoparticles were found to have a significant adsorption capacity for Cr(VI) ions, which is negatively affected by rise in the pH of the aqueous matrix.
journal_name
Ecotoxicol Environ Safjournal_title
Ecotoxicology and environmental safetyauthors
Rouhaninezhad AA,Hojati S,Masir MNdoi
10.1016/j.ecoenv.2020.111247subject
Has Abstractpub_date
2020-12-15 00:00:00pages
111247eissn
0147-6513issn
1090-2414pii
S0147-6513(20)31085-Xjournal_volume
206pub_type
杂志文章abstract::In this work, the internalization and distribution of citric acid-coated magnetite nanoparticles (here, Fe3O4-NPs) in soybean and alfalfa tissues and their effects on plant growth were studied. Both legumes were germinated in pots containing an inert growing matrix (vermiculite) to which Hoagland solution without (con...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2021.111942
更新日期:2021-01-19 00:00:00
abstract::Combined effects of cadmium (Cd) and acid rain on physiological characteristics in Eleocarpus glabripetalus seedlings were investigated under controlled conditions. The single Cd treatment and the combined Cd and acid rain treatment increased growth at low Cd concentrations, while decreased growth and photosynthesis a...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2019.03.026
更新日期:2019-07-15 00:00:00
abstract::To evaluate the effect of biochar amendment on the bioavailability of chlorantraniliprole (CAP) in soils with different physico-chemical properties, the uptake of CAP from various soils by earthworms was studied. It was observed that the biochar amendment of the soils affected the sorption of CAP, but the magnitude of...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2012.06.012
更新日期:2012-09-01 00:00:00
abstract::Sewage treatment plants effectively remove silver (Ag) from sewage. Sewage sludge can therefore be important Ag sinks, polluting the environment with this element. In this work, we report a nation-wide survey on the Ag content of sewage sludge in China (0.23-19.02 mg kg-1, average 2.72 mg kg-1). Furthermore, we identi...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2019.109929
更新日期:2020-02-01 00:00:00
abstract::The toxicity of a combination of nickel (Ni) and copper (Cu) toward growth of heterotrophic microorganisms was greater than the sum of the toxicity of each metal individually. This synergism between Ni and Cu was potentiated at acidic pH levels, with the potentiation of the toxicity being, for some organisms, an effec...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/0147-6513(83)90017-9
更新日期:1983-12-01 00:00:00
abstract::A modified method was proposed which integrates the spatial patterns of toxic metals simulated by sequential indicator simulation, different exposure models and local current land uses extracted by remote-sensing software into a dose-response model for human health risk assessment of toxic metals. A total of 156 soil ...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2016.03.029
更新日期:2016-07-01 00:00:00
abstract::Following oil extraction in the wetland of the Yellow River Delta, heavy metal contamination of coastal saline-alkaline soil, especially with cadmium (Cd), has become a serious environmental problem in some regions. Biochar application has been proposed to remedy Cd-contaminated soil, but the remediation effect is rel...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2020.111172
更新日期:2020-12-01 00:00:00
abstract::The effects of hypoxia and 2,4,5-trichlorophenol (TCP) on the behavior of the freshwater clam Sphaerium corneum (L.) and the accumulation and elimination rates of 2,4,5-trichlorophenol were studied in the laboratory at 20 degrees C. After an initial high activity period, the shell valves were held closed for significa...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1006/eesa.1996.1486
更新日期:1997-02-01 00:00:00
abstract::Triclosan (TCS) is an antimicrobial and is an aquatic contaminant. Little is known on aquatic toxicity of TCS. Rotifers are common members of freshwater zooplankton. In this study, Brachionus calyciflorus was chosen as a test organism to assess the acute and complete life cycle toxicity of TCS in this study. The acute...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2015.12.043
更新日期:2016-05-01 00:00:00
abstract::Humans are exposed to polybrominated diphenyl ethers (PBDEs) via ingestion of food, dust inhalation, and dermal absorption. Exposure to PBDEs via the placenta and breast milk is a special and important pathway in infants. This nested case-control study aimed to investigate the levels of PBDEs in maternal serum and col...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2020.110623
更新日期:2020-07-15 00:00:00
abstract::The Medaka Extended One Generation Reproduction Test (MEOGRT) is a Tier 2 test within U.S. Environmental Protection Agency's (USEPA) Endocrine Disruptor Screening Program (EDSP), designed to characterize the potential adverse effects to fish of exposure to chemical that can cause disruption of the endocrine system. Th...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2018.06.088
更新日期:2018-10-30 00:00:00
abstract::Glutathione-dependent defense against xenobiotic toxicity is a multifaceted phenomenon that has been well characterized in mammals. This study undertakes a comparison of two benthic fish species, the channel catfish and brown bullhead, in terms of characteristics of the glutathione system. The channel catfish, a speci...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1006/eesa.1994.1036
更新日期:1994-06-01 00:00:00
abstract::The mineralization kinetics of the detergent n-dodecylbenzenesulfonate ([14C]LAS) and the plasticizer di(2-ethylhexyl)phthalate ([14C]DEHP) were studied in three fresh sampled soils of different type. Time series of 14CO2 evolution were fitted with various linear and nonlinear models. The kinetics could be represented...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1006/eesa.1996.0066
更新日期:1996-08-01 00:00:00
abstract::Food response preceding and following exposure to Cu concentrations of 0.00, 0.02, and 0.2 mg/L was observed in male and female Cambarus bartonii from an uncontaminated, freshwater lake. The animals were tested in a Y-maze. Control animals demonstrated food localization, and the treated animals, either no localization...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1006/eesa.1999.1910
更新日期:2000-07-01 00:00:00
abstract::The present study aims at assessing the current situation of the heavy metal contaminated River Lot (SW France). Several fish species were captured in October 1987 and 2007 at three sampling sites. The concentration of copper, zinc, cadmium and lead were quantified in fish muscle and liver as well as in environmental ...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2009.06.007
更新日期:2009-10-01 00:00:00
abstract::The increasing use of silver nanoparticles, (AgNPs), will inevitably result in their release into the environment and thereby cause the exposure to plants. It was claimed that using AgNPs is a safe and efficient method to preserve and treat agents of disease in agriculture. This study tries to understand the protein p...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2014.07.013
更新日期:2014-10-01 00:00:00
abstract::Owing to increasing concern of global climate-change, temperature rise is of great interest which can be primarily evaluated from the seasonal variations in some organisms. Aquatic environment can be extremely stressful to its inhabitants because most of them are poikilothermous. In the present study, attempt was made...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2018.04.001
更新日期:2018-08-15 00:00:00
abstract::In this study, feral leaping mullet (Liza saliens) liver microsomal 7-ethoxyresorufin O-deethylase (EROD), and cytosolic glutathione S-transferases (GSTs) activities were investigated using 7-ethoxyresorufin, 1-chloro-2,4-dinitrobenzene (CDNB), and ethacrynic acid (EA) as substrates, respectively. The average EROD act...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2006.08.007
更新日期:2007-11-01 00:00:00
abstract::Mining operations, industrial production and domestic and agricultural use of metal and metal containing compound have resulted in the release of toxic metals into the environment. Metal pollution has serious implications for the human health and the environment. Few heavy metals are toxic and lethal in trace concentr...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章,评审
doi:10.1016/j.ecoenv.2015.12.023
更新日期:2016-04-01 00:00:00
abstract::In this study, we reported the design and the fabrication of Ag and TiO2 modified polycaprolactone (PCL) electrospun nanofiber (NF) mats. The as-prepared NF mats were fabricated by one-step electrospinning and it was exploited for three different purposes (i) reusable SERS substrate for quantitative analysis to trace ...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2019.109856
更新日期:2020-01-30 00:00:00
abstract::Rare earth elements such as lanthanum (La) have been used as agricultural inputs in some countries in order to enhance yield and improve crop quality. However, little is known about the effect of La on the growth and structure of soybean, which is an important food and feed crop worldwide. In this study, bioaccumulati...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2015.07.020
更新日期:2015-12-01 00:00:00
abstract::Exposure to excessive fluoride has been associated with a number of adverse health outcomes; however, there is a lack of evidence on the relation between fluoride exposure and serum uric acid levels, especially in human populations. The present study examined a potential relationship between fluoride exposure, measure...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2020.111670
更新日期:2021-01-15 00:00:00
abstract::Polychlorinated biphenyl (PCB) pollution from shipbuilding in Nagasaki Bay, Japan, was discussed by determining PCB concentrations in sediment, in water, and in biological samples. PCBs were detected in all samples, in which much higher concentrations, more than 10 micrograms/g, were found in three sediment samples wh...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/0147-6513(83)90089-1
更新日期:1983-10-01 00:00:00
abstract::Studies on oxidative stress (OS) in crustacea are widely used as ecotoxicological indices to assess the environment risk produced by the impact of several stressor and pollutants. In the present study, effects of seasonality on OS physiology markers such as antioxidant enzymes (superoxide dismutase, catalase, glutathi...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2012.10.006
更新日期:2013-01-01 00:00:00
abstract::The influence of ethylenediaminetetraacetic acid (EDTA) and chemical species on arsenic accumulation in aquatic floating macrophyte Spirodela polyrhiza L. (duckweed) was investigated. The uptake of inorganic arsenic species (arsenate; As(V) and arsenite; As(III)) into the plant tissue and their adsorption on iron plaq...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2007.07.009
更新日期:2008-06-01 00:00:00
abstract::Nanotechnology is playing an increasing role in the society, but very little is known about the environmental toxicity of nanotechnological products. Few previous studies have been published with regard to the effect of nanoparticles on soil organisms. The present paper deals with the toxicity of carbon double-walled ...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2008.04.011
更新日期:2008-11-01 00:00:00
abstract::Occurrence of arsenic in the aquatic environment of West Bengal (India), Bangladesh and other countries are of immediate environmental concern. In the present study, zebrafish (Danio rerio) was used as a model to investigate oxidative stress related enzyme activities and expression of antioxidant genes in the brain to...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2014.05.012
更新日期:2014-09-01 00:00:00
abstract::Actinoscirpus grossus, a native species in tropical wetlands of South-East Asia, North Australia and the Pacific islands, has been reported to perform well in experimental scale constructed wetland (CW) systems. However, little is known about how high NH4(+) concentrations prevailing in wastewater affect growth and pe...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2014.05.032
更新日期:2014-09-01 00:00:00
abstract::To test the hypothesis that broad spectrum antibodies may be developed as biomarkers useful in detecting the consequence of combined environmental stresses in a wide variety of tissues and organisms, a stretch of 16 amino acids, TVPAYFNDSQRQATKDA, a well-conserved portion of heat shock 70 proteins, was identified, aga...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1006/eesa.1997.1544
更新日期:1997-08-01 00:00:00
abstract::Triclosan is a personal care product widely used in North America, Europe and Asia as antimicrobial ingredient in many consumer chemical products. In Mexico concentrations of triclosan have been reported in aquatic systems. However, there is no law regulating the presence of chemicals such as triclosan, in aquatic sys...
journal_title:Ecotoxicology and environmental safety
pub_type: 杂志文章
doi:10.1016/j.ecoenv.2017.08.049
更新日期:2018-01-01 00:00:00