جستجوی مقالات مرتبط با کلیدواژه « Phytoremediation » در نشریات گروه « شیمی »

Environmental degradation due to crude oil pollution has several impacts, and various mechanisms have been adopted to clean up crude oil components in the environment. One such mechanism is the use of vegetables as a phytoremediation agent. The study investigated the phytoremediation capacity assessment of a common tropical vegetable (Abelmoluscus esculentus) on crude oil-impacted soil. Uptake response of Okra plant at different concentrations of crude oil (5%, 15% and 25%) in 4 kg using laboratory standard techniques, Bioaccumulation factor (BF) and Translocation factor (TF) ratio were analysed. Based on the outcome, the Okra plant showed a significant reduction in heavy metals (HM) concentration in the impacted soil. Hence, the plant showed heavy metals uptake capacity. At 5% crude oil concentration, the BFroot was >1 for all the heavy metals except Cr, while the TF showed that all HMs had <1 except for Hg (>1). For all other concentrations (15% and 25% crude oil), the BF showed <1, except for Cu of BFroot at 15%. Also, the TF showed <1 for other concentrations except Zn at 15%. The significant relationship between the soil and the root of the okra plant can be attributed to the closeness; as expected, the root draws its nutrients from the available soil. Okra (Abelmoschus esculentus) can clean up crude oil-contaminated soil as a cost-effective and environmentally friendly method. The study recommended the prevention of crude oil spillage and further research to establish the most efficient plant period for better uptake capacity of the plant.

Environmental pollution caused by toxic contaminants specially heavy metals is a remarkable issue which directly related to all human activities and mainly has negative effects on human health. Bioremediation is one of the reliable green techniques used for the removal of contaminants form ecosystems. In particular, phytoremediation method is considered as one of the potential approaches for the removal of heavy metals such as the toxic lead metal from environment. We have designed a simple experiment utilized for the removal of lead metal from its solutions. In this phytosorption (biosorption) technique, a dried fava beans powder (Vicia faba</em> L.) was used to take up the lead ions (Pb2+</sup>) from their solutions. It was found that the fava beans biomass have removed up to 96.6% of the lead ions from lead nitrate solutions prepared in different concentrations.

The continuous exposure of the environment to carcinogenic wa s tes and toxic chlorophenols such as pentachlorophenol (PCP) and 2,4,6-trichlorophenol (TCP) resulting from indu s trial production activities has become a great concern to research scienti s ts and environmental policymakers. The search for a co s t-efficient and eco-friendly approach to the phytoremediation of water will guarantee su s tainability. The present research concerns the co s tbenefit evaluation and the optimization modeling of the competitive biosorption of PCP and TCP from aqueous solution to Cana indica. L (CiL-plant) using response surface methodology (RSM) , artificial neural network (ANN) model, and UV-Vis Spectrometry. The predictive performances of the ANN model and the RSM were compared based on their s tati s tical metrics. The antagoni s tic and synergetic effects of significant biosorption variables (pH, initial concentration, and exposure time) on biosorption were s tudied at p-values ≤0.005. The findings from the phytoremediation process confirmed that PCP and TCP removal rate reached equilibrium at the optimum conditions corresponding to predominantly acidic pH (4), required initial concentration of 50 mg L-1, and exposure time of 25 days in aquaponia. The optimized output transcends to PCP and TCP removal rates of 90% and 87.99% efficiencies at predicted r-squared ≤0.9999 and a 95% confidence interval. The co s t-benefit evaluation e s tablished that at the optimum conditions, the co s t of operating the removal of TCP from the aqueous solution would save $ 7.72 compared to PCP. The optimization model’s reliability based on the experiment’s (DoE) design was more su s tainable than the one-factorat- a-time (OFAT) methodologies reported in previous research.

This study presents the evaluation of heavy metal removal using Phragmites australis (Cav.) and Schoenoplectus californicus (C.A. Mey.) in a laboratory wetland test (10-days). Two digestion methods Dry Ashing (DA) and Wet Digestion (WD) to determine the final concentration of heavy metal in roots and stems of both plants were used. The final concentration of Cu (5.14 ug.g-1), Zn (27.34 ug.g-1) and Fe (107.91 ug.g-1) were determined in the roots of the Schoenoplectus californicus (C.A. Mey.). While in its stems the highest concentration of Pb (1.69 ug.g-1) was founded. In Phragmites australis (Cav.) the high concentrations of Cu (2.44 ug.g-1), Zn (5.22 ug.g-1) and Fe (28.10 ug.g-1) are found in the roots and Pb (0.70 ug.g-1) in the stems. Regardless of the plants studied, the WD method was the most suitable pretreatment method for determining Cu and Fe concentrations, while the DA method was the best for Zn and Pb.

The present work aims to evaluate two native plants including, Hammada scoparia (H. scoparia) and Halocnemum Strobilaceum (H. Strobilaceum), which grow in Benghazi-Libya for soil phytoremediation purpose. Plants and soil samples were collected and analyzed for Cu, Zn, Fe and Cr concentrations at different sites in the north coastal region of Benghazi. Performance of Hammada scoparia and Halocnemum Strobilaceum was evaluated by calculating biological absorption coefficient (BAC), bioconcentration factor (BCF), and translocation  factor (TF). Both plants were found to be a moderate extractor. The tendency of the plants toward phytoextraction process and phytostabiliztion process was studied. Both plants tend to phytoextraction process except Halocnemum Strobilaceum tends strongly to phytostabiliztion process in case of Cu and Fe.

The potential of Hammada scoparia (Hamm.) and Halocnemum Strobilaceum (Halo.) growing in Benghazi-Libya for soil phytoremediation purpose has been evaluated. Hammada scoparia (Hamm.) and Halocnemum Strobilaceum (Halo.) and their roots soil samples were collected and analyzed for Cd, Ni and Pb concentrations in a salty area in the north coastal region of Benghazi, near Benghazi asphalt factory, Benghazi steel factory, Brega oil company sorage tanks, and north Benghazi power station. The biological absorption coefficient (BAC), bioconcentration factor (BCF), and translocation factor (TF) of Hammada scoparia and Halocnemum Strobilaceum have been calculated. Both plants are moderate extractor, they tend to phytoextraction process except Halo tends strongly to phytostabiliztion process in case of Cu and Fe.

The increased concentrations of heavy metals in soil pose a threat to human life through the food chain. Soil and plant samples from the coastal area of Benghazi city were collected and analyzed using flame atomic absorption spectroscopy (FAAS) for their heavy metal contents. The metal content of Cu, Cr, Ni, Zn, and Pb has been determined in the soil in the vicinity of plant roots, plant roots, and leaves. Biological absorption coefficient (BAC), bioconcentration factor (BCF), and translocation factor (TF) have been calculated to evaluate the ability of Suaeda vera to extract the metals from soil. The results showed that Suaeda vera Forssk. Ex J.F. Gmel is more suitable for phytoextraction than the phytostabilisation. Phytoremediation as a green technology has many advantages over the other methods of heavy metals removal from soils.