The Experts below are selected from a list of 9438 Experts worldwide ranked by ideXlab platform
Sibel Tunali Akar - One of the best experts on this subject based on the ideXlab platform.
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Utilization of Thamnidium elegans fungal culture in Environmental Cleanup: A reactive dye biosorption study
Ecological Engineering, 2013Co-Authors: Tamer Akar, Sercan Arslan, Sibel Tunali AkarAbstract:Abstract In this study, the potential of biomaterial obtained from filamentous fungi, Thamnidium elegans was investigated for the batch and dynamic flow mode biosorption of Reactive Red 198 (RR198). The effects of pH, biosorbent amount, contact time, initial dye concentration and ionic strength were evaluated in addition to the investigation of its biosorption performance in the presence of other dyes in the biosorption medium. High biosorption yields were recorded by using small amount of biosorbent in a relatively short time. The biosorption process followed by the pseudo-second-order kinetic and the Langmuir isotherm models. Maximum monolayer dye biosorption capacity of biosorbent was found as 234.24 mg g−1 in batch conditions. Biosorption–desorption studies indicated that T. elegans has relatively good regeneration ability. Also the suggested biomaterial exhibited high biosorption yield in competitive and real wastewater conditions. The dye removal mechanism was evaluated by IR, SEM and zeta potential analysis. Overall, batch and dynamic-flow mode studies indicated that this Environmentally friendly biosorbent may be an alternative for the removal of reactive dyes from contaminated media.
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phosphate removal potential of the adsorbent material prepared from thermal decomposition of alunite ore kcl mixture in Environmental Cleanup
Desalination, 2010Co-Authors: Sibel Tunali Akar, Ilknur Tosun, Adnan Ozcan, Tevfik GedikbeyAbstract:Abstract This study focused on the preparation of a thermal decomposition product of alunite and potassium chloride mixture as an adsorbent for the removal of phosphate ions from aqueous solutions. The adsorbed phosphate ions were quantitatively determined by using ion chromatographic method. The adsorption of phosphate onto adsorbent was strongly dependent on pH and on ionic strength. The optimum pH for the adsorption of phosphate was 3.0. Contact time was 40 min to reach adsorption equilibrium. The equilibrium data fitted well to Langmuir isotherm model. The thermodynamic parameters (ΔH0, ΔS0 and ΔG0) of phosphate adsorption at different temperatures calculated from the temperature-dependent adsorption isotherms indicated that the adsorption process was endothermic. The phosphate adsorption was also well applied in continuous system.
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an attractive agro industrial by product in Environmental Cleanup dye biosorption potential of untreated olive pomace
Journal of Hazardous Materials, 2009Co-Authors: Tamer Akar, Ilknur Tosun, Zerrin Kaynak, Esra Ozkara, Onur Yeni, Esin N Sahin, Sibel Tunali AkarAbstract:This research deals with the evaluation of highly available and cost effective waste biomass of olive pomace for the removal of reactive textile dye, RR198 from aqueous medium and a real effluent. The experiments were conducted to assess the effects of process variables such as initial pH, biosorbent dosage, contact time, temperature and ionic strength. The results showed that the highest dye biosorption capacity was found at pH 2 and the needed time to reach the biosorption equilibrium was 40 min with a biosorbent concentration of 3.0 g L(-1). The sorption kinetics of dye was best described by the pseudo-second-order kinetic model. The equilibrium biosorption data were analyzed by Langmuir, Freundlich and Dubinin-Radushkevich isotherm models and the results from the isotherm studies showed that the RR198 biosorption process occurred on a homogenous surface of the biosorbent. The waste biomass of olive oil industry displayed biosorption capacities ranging from 6.05 x 10(-5) to 1.08 x 10(-4)mol g(-1) at different temperatures. The negative values of Delta G degrees and the positive value of Delta H degrees suggest that the biosorption process for RR198 was spontaneous and endothermic. Dye-biosorbent interactions were examined by FTIR and SEM analysis. Finally, high biosorption yield of olive waste for the removal of RR198 dye from real wastewater makes it possible that the olive pomace could be applied widely in wastewater treatment as biosorbent taking into account that no pretreatment on the solid residue is carried out.
Elizabeth A H Pilonsmits - One of the best experts on this subject based on the ideXlab platform.
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Environmental Cleanup using plants biotechnological advances and ecological considerations
Frontiers in Ecology and the Environment, 2006Co-Authors: Elizabeth A H Pilonsmits, John L FreemanAbstract:Plants and their associated microbes can be used in the Cleanup and prevention of Environmental pollution. This relatively new and growing technology uses natural processes to break down, stabilize, or accumulate pollutants. Knowledge of the biochemical processes involved may lead to the development of more efficient plants and better management practices. One approach for improving the efficiency of phytoremediation includes developing transgenic plants. Here, we give an overview of phytoremediation methods and their associated biological processes, and discuss approaches that have been used successfully to breed transgenic plants with advanced phytoremediation properties. Much is still unknown about the ecological implications of phytoremediation, especially when using transgenic plants. Phytoremediation-related processes can change the location or chemical makeup of contaminants; the question is how those processes will affect the interactions among organisms in the ecosystem, and how transgenic plants...
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phytoremediation of metals using transgenic plants
Critical Reviews in Plant Sciences, 2002Co-Authors: Elizabeth A H Pilonsmits, Marinus PilonAbstract:An ideal plant for Environmental Cleanup can be envisioned as one with high biomass production, combined with superior capacity for pollutant tolerance, accumulation, and/or degradation, depending on the type of pollutant and the phytoremediation technology of choice. With the use of genetic engineering, it is feasible to manipulate a plant's capacity to tolerate, accumulate, and/or metabolize pollutants, and thus to create the ideal plant for Environmental Cleanup. In this review, we focus on the design and creation of transgenic plants for phytoremediation of metals. Plant properties important for metal phytoremediation are metal tolerance and accumulation, which are determined by metal uptake, root-shoot translocation, intracellular sequestration, chemical modification, and general stress resistance. If we know which molecular mechanisms are involved in these tolerance and accumulation processes, and which genes control these mechanisms, we can manipulate them to our advantage. This review aims to give...
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breeding mercury breathing plants for Environmental Cleanup
Trends in Plant Science, 2000Co-Authors: Elizabeth A H Pilonsmits, Marinus PilonAbstract:Abstract In an elegant study, Richard Meagher's research group has succeeded in introducing a bacterial mercury detoxification pathway into plants 1 . The resulting plants show enhanced mercury tolerance and can convert highly toxic forms of organic mercury to less toxic elemental mercury, which is volatile. The significance of this study is that it could lead to the more efficient and affordable Cleanup of Environmental mercury pollution, and in a broader context, it proves the power of genetic engineering for phytoremediation.
Marinus Pilon - One of the best experts on this subject based on the ideXlab platform.
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phytoremediation of metals using transgenic plants
Critical Reviews in Plant Sciences, 2002Co-Authors: Elizabeth A H Pilonsmits, Marinus PilonAbstract:An ideal plant for Environmental Cleanup can be envisioned as one with high biomass production, combined with superior capacity for pollutant tolerance, accumulation, and/or degradation, depending on the type of pollutant and the phytoremediation technology of choice. With the use of genetic engineering, it is feasible to manipulate a plant's capacity to tolerate, accumulate, and/or metabolize pollutants, and thus to create the ideal plant for Environmental Cleanup. In this review, we focus on the design and creation of transgenic plants for phytoremediation of metals. Plant properties important for metal phytoremediation are metal tolerance and accumulation, which are determined by metal uptake, root-shoot translocation, intracellular sequestration, chemical modification, and general stress resistance. If we know which molecular mechanisms are involved in these tolerance and accumulation processes, and which genes control these mechanisms, we can manipulate them to our advantage. This review aims to give...
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breeding mercury breathing plants for Environmental Cleanup
Trends in Plant Science, 2000Co-Authors: Elizabeth A H Pilonsmits, Marinus PilonAbstract:Abstract In an elegant study, Richard Meagher's research group has succeeded in introducing a bacterial mercury detoxification pathway into plants 1 . The resulting plants show enhanced mercury tolerance and can convert highly toxic forms of organic mercury to less toxic elemental mercury, which is volatile. The significance of this study is that it could lead to the more efficient and affordable Cleanup of Environmental mercury pollution, and in a broader context, it proves the power of genetic engineering for phytoremediation.
Tamer Akar - One of the best experts on this subject based on the ideXlab platform.
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Utilization of Thamnidium elegans fungal culture in Environmental Cleanup: A reactive dye biosorption study
Ecological Engineering, 2013Co-Authors: Tamer Akar, Sercan Arslan, Sibel Tunali AkarAbstract:Abstract In this study, the potential of biomaterial obtained from filamentous fungi, Thamnidium elegans was investigated for the batch and dynamic flow mode biosorption of Reactive Red 198 (RR198). The effects of pH, biosorbent amount, contact time, initial dye concentration and ionic strength were evaluated in addition to the investigation of its biosorption performance in the presence of other dyes in the biosorption medium. High biosorption yields were recorded by using small amount of biosorbent in a relatively short time. The biosorption process followed by the pseudo-second-order kinetic and the Langmuir isotherm models. Maximum monolayer dye biosorption capacity of biosorbent was found as 234.24 mg g−1 in batch conditions. Biosorption–desorption studies indicated that T. elegans has relatively good regeneration ability. Also the suggested biomaterial exhibited high biosorption yield in competitive and real wastewater conditions. The dye removal mechanism was evaluated by IR, SEM and zeta potential analysis. Overall, batch and dynamic-flow mode studies indicated that this Environmentally friendly biosorbent may be an alternative for the removal of reactive dyes from contaminated media.
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an attractive agro industrial by product in Environmental Cleanup dye biosorption potential of untreated olive pomace
Journal of Hazardous Materials, 2009Co-Authors: Tamer Akar, Ilknur Tosun, Zerrin Kaynak, Esra Ozkara, Onur Yeni, Esin N Sahin, Sibel Tunali AkarAbstract:This research deals with the evaluation of highly available and cost effective waste biomass of olive pomace for the removal of reactive textile dye, RR198 from aqueous medium and a real effluent. The experiments were conducted to assess the effects of process variables such as initial pH, biosorbent dosage, contact time, temperature and ionic strength. The results showed that the highest dye biosorption capacity was found at pH 2 and the needed time to reach the biosorption equilibrium was 40 min with a biosorbent concentration of 3.0 g L(-1). The sorption kinetics of dye was best described by the pseudo-second-order kinetic model. The equilibrium biosorption data were analyzed by Langmuir, Freundlich and Dubinin-Radushkevich isotherm models and the results from the isotherm studies showed that the RR198 biosorption process occurred on a homogenous surface of the biosorbent. The waste biomass of olive oil industry displayed biosorption capacities ranging from 6.05 x 10(-5) to 1.08 x 10(-4)mol g(-1) at different temperatures. The negative values of Delta G degrees and the positive value of Delta H degrees suggest that the biosorption process for RR198 was spontaneous and endothermic. Dye-biosorbent interactions were examined by FTIR and SEM analysis. Finally, high biosorption yield of olive waste for the removal of RR198 dye from real wastewater makes it possible that the olive pomace could be applied widely in wastewater treatment as biosorbent taking into account that no pretreatment on the solid residue is carried out.
Hikmat S. Hilal - One of the best experts on this subject based on the ideXlab platform.
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solid olive waste in Environmental Cleanup enhanced nitrite ion removal by zncl2 activated carbon
Journal of Environmental Management, 2015Co-Authors: Ahed Zyoud, Hiba Nassar, Amer Elhamouz, Hikmat S. HilalAbstract:This communication describes how olive solid wastes can be used to prepare activated carbon (AC), with soundly high surface areas, suitable to remove nitrite ions from water. Solid olive wastes, so called Jeft, separated as unwanted bi-products from olive oil mills, have been converted into charcoal. The charcoal was then physically and/or chemically activated using different compounds namely conc. H3PO4 or ZnCl2. Charcoal carbonization was performed under inert atmosphere to avoid loss of heated carbon by oxidation with air. Surface area measurements and SEM micrographs showed that activation using ZnCl2 yields AC with highest surface area and more porous surfaces. The ZnCl2-activated carbon was then used to remove nitrite ions from water by adsorption. Effects of different parameters on value of surface area and adsorption capacity of the AC were investigated. Commercial AC materials were used as reference for comparison. The AC showed higher adsorption capacity toward nitrite than other reported adsorbents. The results suggest that using 5 g of the ZnCl2-activated carbon per liter of heavily nitrite-contaminated water (50 ppm) may bring the contaminant concentration down to the WHO accepted concentration limits within 60 min. This work highlights the future feasibility of using olive waste as feed stocks to produce useful renewable materials while keeping in mind the wisdom "make wastes work in Environmental protection".
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Solid olive waste in Environmental Cleanup: oil recovery and carbon production for water purification.
Journal of Environmental Management, 2006Co-Authors: Amer El-hamouz, Hikmat S. Hilal, Nashaat N. Nassar, Zahi MardawiAbstract:A potentially-economic three-fold strategy, to use solid olive wastes in water purification, is presented. Firstly, oil remaining in solid waste (higher than 5% of waste) was recovered by the Soxhlet extraction technique, which can be useful for the soap industry. Secondly, the remaining solid was processed to yield relatively high-surface area active carbon (AC). Thirdly, the resulting carbon was employed to reversibly adsorb chromate ions from water, aiming to establish a water purification process with reusable AC. The technique used here enabled oil recovery together with the production of a clean solid, suitable for making AC. This process also has the advantage of low production cost.