Abstract Disposal of industrial effluents (especially the textile industry) into the drains without prior treatment is a common practice that affects aquatic life and pollutes the soil and groundwater quality. Textile effluents contain organic and inorganic pollutants in terms of high pH, suspended and dissolved solids, chemical oxygen demand, heavy metals, and many other contaminants. Therefore, it is obligatory to dispose off wastewater according to environmental standards....
26m
Abstract The clastogenicity of the water of a lake was investigated using the Tradescantia micronuclei test (Trad-MCN). Genomic damage in the plant’s generative sphere is manifested by a significant increase in micronuclei frequency in all samples. An integrative statistical analysis linked the test endpoints with metals present in low concentration in the lake’s water. Thorough comparisons of the results obtained from Tradescantia stamen hair mutation test (Trad-SHM) were conducted...
12h
Abstract The present study reports the synthesis, characterisation and efficiency in the degradation of organic dye of nickel/hydroxyapatite/cobalt ferrite (Ni/HAP/CoFe2O4) novel nanocomposite. The composite was applied as both nanoadsorbent and heterogeneous catalyst for the degradation of organic dyes methylene blue and methyl orange. The composite was not very effective in the degradation of the dyes by adsorption method. However, in the presence of H2O2, significant catalytic...
1d
Abstract Coastal sediment redeposition after resuspension events may change the sediment capacity to sequester pollutants after the formation of new sediment-water interfaces. To test this hypothesis, radiotracer experiments were performed to evaluate zinc (65Zn) and cadmium (109Cd) removal kinetics by redeposited mangrove sediments. After 24-h experiments, average inventories within redeposited sediments were close to those from control sediments (~ 20% lower in redeposited...
1d
Abstract Integrated constructed wetland into activated sludge process has a potential in improving treated wastewater with high organic loading. However, biological activities on those processes will generate microbial by-products from substrate metabolism and cell lysis. The presence of those compounds in effluent of wastewater treatment causes problems in source water. This study combines fluorescence excitation emission matrices (FEEM) with high-performance size exclusion...
1d
Abstract Chelates, used to increase the uptake of heavy metals in phytoremediation, can also increase the mobility of metals. If plants fail to uptake or stabilize all the mobilized metals, then subsurface soil or groundwater can be contaminated. Therefore, the type and concentration of chelate used and proper site management are important for chelate-aided phytoremediation. In this study, we evaluated potential metal leaching from the soil after applying three different chelates....
2d
Abstract In Brazil, safe drinking water is not widely available, and consequently waterborne diseases are still associated with high morbidity and mortality rates. Among waterborne bacteria, diarrheagenic Escherichia coli (DEC) should be highlighted. This study targeted the evaluation of enteropathogenic (EPEC), enterotoxigenic (ETEC), and shiga toxin-producing (STEC)/enterohemorrhagic Escherichia coli in drinking water in Southeast Brazil and the georeferencing of generated...
2d
Abstract Heavy metal pollution in river sediments is one of the most serious problems in the aquatic environment. In this study, thirty-two surface sediment and overlying water samples were collected to evaluate the nutrient levels and heavy metal contents (Mo, Cu, Zn, Ni, Cd, Pb, and Cr) in the Hai River and its tributaries, which is the largest river flowing into Bohai Bay. The enrichment degree and geoaccumulation value of the studied metals decreased in the same order of...
3d
Abstract The naproxen adsorption capacity enhancement of activated carbon prepared from the Indian gooseberry seed-shells by manufacturing a composite blended with the surface-modified graphite powder and silver nanoparticles was studied in the present context. The composite of the nano-sized materials was prepared in dimethylformamide solution and characterized by employing XRD, Raman, EDS and FT-IR spectroscopy, FETEM, and FESEM microscopy. The pseudo-first-order, pseudo-second-order,...
3d
Abstract This study aimed to develop Ca-alginate immobilized Providencia vermicola as a reusable biosorbent to recover palladium ions from acidic solutions. To examine the adsorption characteristics and availability of Ca-alginate immobilized P. vermicola for Pd(II) recovery, several experiments such as SEM-EDX, FT-IR, isotherm, kinetics, fixed-bed columns, desorption, and reusability were conducted. The results of SEM-EDX and FT-IR analyses demonstrated that amino and carboxyl...
3d
Abstract The non-steroidal anti-inflammatory pharmaceuticals ketoprofen, meloxicam, and tenoxicam were degraded by photo-assisted peroxidation (hv/H2O2) and photo-Fenton processes under simulated solar radiation (sunlight) and UV-C. Preliminary studies showed that the processes under UV-C and sun-photo-Fenton radiation showed similar degradation results. The sun-photo-Fenton was less sensitive to the concentration variation of the H2O2 oxidant. Given that, in general, the highest...
3d
Abstract The potential of using iron-oxidizing and sulfur-oxidizing bioleaching process for removal of heavy metals (HMs) was investigated at initial unadjusted pH of pig manure (PM). The indigenous iron-oxidizing and sulfur-oxidizing microorganisms enriched from PM were primarily Alicyclobacillus and Acidithiobacillus thiooxidans, respectively. After 12 days of bioleaching, 95% of Cu, 96.5% of Zn, 93.6% of Mn, and 92.7% of Cd were removed from the PM in sulfur-oxidizing bioleaching...
4d
Abstract The present study provides an alternative view of the applications of response surface methodology (RSM) coupled to the Derringer’s desirability function (DF) to analyze and optimize system’s composition to target different environmental applications related to the transport of As (V) through polymer inclusion membranes (PIMs). In this case, membranes contained cellulose triacetate (CTA), as support, trioctylmethylammonium chloride (Aliquat 336 = A336), as carrier, and...
4d
Abstract Activated coke was prepared by CO2 activation using solid waste fine blue-coke as main raw material and coal direct liquefaction residue (DCLR) as binder. The activated coke was characterized by BET, XRD, and infrared analysis. The flue gas desulfurization experiment was carried out with a fixed bed reactor and activated coke as the adsorbent. The experimental results show that coal direct liquefaction residue pyrolysis process will produce a large number of cohesive...
4d
Abstract In this presented work, poly(2-hydroxyethyl methacrylate-glycidyl methacrylate) [p(HEMA-GMA)] cryogels were prepared by using the radicalic cryopolymerization technique, and then modified with lectin protein ConA. These ConA functionalized cryogels were used for the immobilization of laccase, and enzyme loading was found to be as 7.1 mg/g cryogel. Finally, these laccase immobilized cryogels were successfully used for the decolorization of six different types of dye molecules.
5d
Abstract Naproxen is an organic micropollutant widely distributed in municipal wastewaters and water bodies, it is not eliminated by wastewater treatment plants, and it accumulates in soil. In this research, the capability of the non-viable Rhizopus oryzae biomass (wet and dry) to sorb naproxen at environmentally relevant concentrations was assessed in batch experiments. Naproxen sorption was carried out as a function of pH and modeled by kinetic and equilibrium equations. Naproxen...
6d
Abstract To improve hexavalent chromium (Cr(VI)) retention of montmorillonite (Mt) at pH 3, Mt sample was subjected to different treatments: thermal ones at 600 °C or 950 °C, 2 h, or mechanical grinding for 300 s. Then, the obtained products were loaded with different octadecyl trimethyl ammonium loading and 50% and 100% of Mt cation exchange capacity (CEC). The samples were characterized by several techniques at each stage. Differential thermogravimetric analysis (DTGA) performed...
6d
Abstract In this study, magnetic snail shell (MSS) prepared by impregnating of iron oxide onto snail shell (SS) powder was used for removing Cr(VI) from aqueous solution. Among six different mass ratios of Fe/SS powder studied, the MSS25 produced at a ratio of 25% achieved the highest Cr(VI) adsorption capacity. Batch adsorption experiments were conducted to investigate the adsorption isotherm, kinetics, and mechanism of Cr(VI) onto MSS25. The results illustrated that adsorption...
1w
Abstract In the process of identifying groundwater pollution sources, in order to solve the problem that the monitoring data of monitoring wells was insufficient or the correlation between monitoring data and model parameters was weak, a monitoring well optimization method based on Bayesian formula and information entropy was proposed. Two-dimensional phreatic groundwater solute transport model was built and solved by using GMS software. To reduce the computational load of calling...
2w
Abstract The treatment efficiency of Chlorella sorokiniana and Scenedesmus species, immobilized in sodium alginate, was evaluated for removing nitrate from groundwater. The experiments were performed initially in batch mode and the best-performing conditions were replicated in sequencing batch reactor mode. S. sp. showed a higher nitrate uptake in short term than C. sorokiniana. Immobilized S. sp. and C. sorokiniana cells showed 90% nitrate removal in 9 and 12 days, respectively....
2w
Abstract The presence of phosphorus in water is a major cause behind the eutrophication of the aquatic environment. The growing trend focuses on the use of agriculture waste to fabricate biosorbents with higher removal capabilities for phosphate present in wastewater. Herein, a novel adsorbent named multifunctional biochar (MFBC) was applied for the decontamination of both phosphate and cadmium through two-stage adsorption. The as-prepared MFBC was characterized by TEM, BET,...
2w
Abstract Textile industry is responsible for producing a large amount of effluent. The objective of the present study was to treat the raw effluent of a textile manufacturer through heterogeneous photocatalysis (TiO2/UVsolar). Four types of effluents were evaluated: raw (RE), treated by the manufacturer (MTE), and exposed to photocatalysis in the presence (PTETi) and absence (PTE) of titanium dioxide (TiO2). They were evaluated for physical, chemical, and toxicological parameters....
2w
Contrasting Response of Nutrient Acquisition Traits in Wheat Grown on Bisphenol A-Contaminated Soils
Abstract Repeated application of organic fertiliser has unintentionally let to the introduction into surface water and soils of many phytotoxic substances that compromise agricultural production and threaten environmental quality. Recent studies using hydroponic systems have reported that bisphenol A (BPA) affects essential mineral elements contents and root absorptive function, thereby impacting nutrient content in plant. However, in soils, plants develop specific traits related...
2w
Abstract The use of arbuscular mycorrhizal fungi (AMF) is considered an important strategy to bioremediate contaminated soil by heavy metals. However, the mechanisms used by AMF to attenuate plant toxicity, caused by the higher manganese (Mn) concentrations in the soil, remain poorly understood. We analyzed the influence of Mn on Leucaena leucocephala development and tolerance inoculated with different AMF species (Claroideoglomus etunicatum, Acaulospora scrobiculata and native...
3w
Abstract The bivalve specie Mytella charruana has shown great potential as a bioindicator in natural waters and a biofilter for the adsorption of metals, such as Cr(VI). This species has been found in important densities in Cartagena de Indias Bay, where high concentrations of Cr(VI) have also been reported. Thus, the purpose of this paper is to study the potential of the bivalve specie Mytella charruana, grown in Cr(VI) rich media, as a bio-adsorption treatment for Cr(VI) removal...
3w
Abstract Cetyl trimethylammonium bromide (CTMAB)–modified bentonite was synthesized as adsorbent for the removal of Cr(VI) from aqueous solutions. Batch adsorption studies show that the adsorption capacity of CTMAB-modified bentonite (1.962 mg g−1) was about 19 times higher than that of natural bentonite (0.101 mg g−1). The weakly acidic or neutral environment can improve the adsorption ability of both natural and modified bentonites. Cr(VI) adsorption onto CTMAB-modified bentonite...
3w
Abstract In this study, highly ordered TiO2 nanotube arrays (TNAs) with length 1~2 μm were rapidly fabricated via the electrochemical anodic oxidation process, which was specifically used for the photocatalytic degradation of organic pollutants. The effects of the anodization conditions on the nanotube microstructures were investigated with scanning electron microscope (SEM). The crystalline phase and surface element of the as-prepared samples were characterized by X-ray diffraction...
3w
Abstract Different carbon xerogels (CXs) were synthesized by the polymerization of resorcinol (R) and formaldehyde (F) catalyzed by cesium carbonate (Cs), and by varying the molar ratio R/Cs. The CXs were labeled as XCs-100, XCs-500, XCs-1000, and XCS-2000, corresponding to the R/Cs ratio of 100, 500, 1000, and 2000, respectively. The surface chemistry of the CXs varied very slightly with the R/Cs ratio because the point of zero charge (pHPZC) and the concentrations of basic...
3w
Abstract The MeHg content in the reed wetland soil of Liaohe was studied by the indoor-simulated constant temperature culture method. Under different aerobic and anaerobic conditions, the flooding salinity (CK, 0.5%, 1.0%, 1.5%, 2.0%) changes relationship whether SRB plays a leading role in the formation of MeHg. The results showed that under aerobic conditions, the content of MeHg in the surface layer and the bottom layer showed a trend of decreasing first and then increasing...
3w
Abstract This study investigated the metabolic response of E. coli after exposure to TiO2 and ZnO NPs under solar simulated irradiation. A total of 14 altered metabolites involved in two metabolic pathways were recognized using multivariate analysis. Polyamine, putrescine was elevated in ZnO-treated group, as an adaptation to oxidative stress in cells, whereas it was significantly reduced in TiO2-treated group. Glycine levels also were elevated in both the treatment groups, showing...
3w
Abstract Soil degradation and desertification from agricultural land use is a serious and growing problem worldwide. Bringing degraded soils back into production is crucial to stop the cycle of land degradation, followed by abandonment and a subsequent shift of agricultural pressure to previously uncultivated soils. To return degraded and desertified landscapes to productivity, sandy soils must first be improved to enhance water and nutrient holding capacity. In this study we...
3w
Abstract In recent years, there has been an increasing need for energy, depending on population growth and the rapid development of industry. Consequently, in large power plants, factories, and vehicles, large quantities of toxic gases are emitted into the air as a result of the burning of fossil fuels every year. These gases have negative effects on both human health and the environment. In this study, a new method was proposed for eliminating environmentally hazardous flue...
3w
Abstract Agricultural land use is widely accepted to elicit changes on surrounding environment and neighboring ecosystems. Meanwhile, the impact of different types of agricultural land use likely cause a variety of impacts on nearby ecosystems and the organisms that inhabit them. Freshwater systems support a wide range of organisms—from infaunal or epifaunal invertebrates to mobile pelagic and littoral fish species. The focus of this study was to determine how agricultural activity...
3w
Abstract Due to its low cost and high reactivity, nanoiron has been widely used for remediating contaminated soils. However, accumulation of large amounts of iron in the soil may be toxic for plants. This research aims at investigating the possible phytotoxic effects of the presence of nanoparticles of iron in the soil, with emphasis on seedling emergence and initial plant growth of soybean and corn. Nanoiron concentrations of 0, 15, and 30 g/kg of soil were examined. For each...
3w
Abstract We report on the concentration of heavy metals (cadmium, chromium, cobalt, copper, iron, and lead) in the water and sediment of Lake Greenwood and the streams and creeks that flow into the lake. Our results show heavy metal concentrations well below levels that were reported in 2012. The heavy metal concentrations reported for Lake Greenwood were on the order of the established background levels; our measurements indicate that heavy metal concentrations are now well...
3w
Abstract With the extensive mining of vanadium (V) ore, much attention has been focused on soil V pollution and its hazards. This study was conducted to investigate the adsorption-desorption properties of V on silica under various conditions, such as initial vanadate (V(V)) concentration, reaction time, pH, ionic strength, and temperature. The Langmuir and Freundlich isotherm models were applied to describe the adsorption of V(V) on silica and the results indicate that the adsorption...
3w
Abstract Aquatic systems are seldom disturbed by a single stressor agent. Considering that nutrients and metals occur simultaneously in the environment, studies on the combined effects of these elements on the biota need to be carried out. The aim of this study was to evaluate the effect of the microalga Raphidocelis subcapitata exposed to different combinations of phosphorus (P) and zinc (Zn) on the neotropical cladoceran Ceriodaphnia silvestrii. The algae acclimated to P concentrations...
3w
Abstract In several countries, mining generates a high volume of tailing deposits, significantly impacting on soils. One of the non-metallic elements found in high concentrations in mine tailings is sulphur (S), in the form of sulphide minerals, whose oxidation causes acid drainage and metal mobility. The absorption of S in plants cultivated in mine tailings has been scarcely investigated. The objective of this study was to evaluate the extent to which a commercial humic substances...
4w
Abstract Cross-linking of polymer hydrogels can be achieved by exposing the polymer to gamma radiation that induces production of polymer chain radicals resulting in cross-linking of chains. The present study was focused on fabrication of hydrogel by gamma irradiation for immobilization of bacterial cells. Hydrogels were prepared using 30 and 40% acrylamide at gamma irradiation dose of 5 kGy. Five bacterial strains BR-6, BR-14, BR-18, BR-21, and BR-26 screened for resistance...
4w
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