Pub Date : 2022-12-01DOI: 10.1680/jenes.2022.17.4.155
J. Meegoda
{"title":"Editorial","authors":"J. Meegoda","doi":"10.1680/jenes.2022.17.4.155","DOIUrl":"https://doi.org/10.1680/jenes.2022.17.4.155","url":null,"abstract":"","PeriodicalId":15665,"journal":{"name":"Journal of Environmental Engineering and Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48311299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Lakestani, İ. Çakır, H. Gozdas, I. Yildiz, A. Demirhan
Maintaining high indoor air quality in hospitals is important for protecting the health of both personnel and patients. In this study, the results of air quality monitoring carried out in the intensive care unit of a hospital in Bolu, Turkey, are discussed. Air disinfection devices were used to reduce the concentrations of bacteria. A four-week sampling program was implemented. In the first and the last weeks of the sampling, the disinfection devices were turned off, while in the second and third weeks they were turned on. Bioaerosols were collected and their indoor levels were determined by counting all plate colonies and bacterial types were identified by MALDI-TOF-MS. The highest levels of bacteria were measured in the mornings and before the air disinfection devices were turned on. Doctors do their rounds at approximately 9-10 o’clock. The dominant bacteria in the air samples examined were Staphylococcus hominis, Micrococcus luteus, Staphylococcus capitis, Staphylococcus epidermidis, Corynebacterium afermentans, and Staphylococcus haemolyticus. The results showed that the air disinfection devices were effective in decreasing the concentration of microorganisms between 83.4%- 55% in the intensive care unit, which is very important for the healthcare staff and patients, especially during pandemics.
{"title":"Monitoring, control, and reduction of bioaerosols in the intensive care unit","authors":"S. Lakestani, İ. Çakır, H. Gozdas, I. Yildiz, A. Demirhan","doi":"10.1680/jenes.22.00002","DOIUrl":"https://doi.org/10.1680/jenes.22.00002","url":null,"abstract":"Maintaining high indoor air quality in hospitals is important for protecting the health of both personnel and patients. In this study, the results of air quality monitoring carried out in the intensive care unit of a hospital in Bolu, Turkey, are discussed. Air disinfection devices were used to reduce the concentrations of bacteria. A four-week sampling program was implemented. In the first and the last weeks of the sampling, the disinfection devices were turned off, while in the second and third weeks they were turned on. Bioaerosols were collected and their indoor levels were determined by counting all plate colonies and bacterial types were identified by MALDI-TOF-MS. The highest levels of bacteria were measured in the mornings and before the air disinfection devices were turned on. Doctors do their rounds at approximately 9-10 o’clock. The dominant bacteria in the air samples examined were Staphylococcus hominis, Micrococcus luteus, Staphylococcus capitis, Staphylococcus epidermidis, Corynebacterium afermentans, and Staphylococcus haemolyticus. The results showed that the air disinfection devices were effective in decreasing the concentration of microorganisms between 83.4%- 55% in the intensive care unit, which is very important for the healthcare staff and patients, especially during pandemics.","PeriodicalId":15665,"journal":{"name":"Journal of Environmental Engineering and Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42018088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Hadri, K. Draoui, L. Bounab, M. Hamdaoui, Hikmat Douhri, Imane Kouda, H. Zaitan
Pollution by dyes is one of the main pollution of industrial effluents. In this research we examined Moroccan diatomite (DT) as a low cost adsorbent to remove one of these dangerous dyes, malachite green (MG). BET, SEM, pHpzc and XRD were used to assess the characterization of diatomite. The studies were carried out at different levels, of pH, diatomite mass and MG concentrations, with a temperature of 25°C. Equilibrium, kinetics and thermodynamic characteristics were also studied. Results show that the diatomite consisted of an integrated and nearly circular sieve plate with many small ordered pores, giving it a high specific surface area of 17.36 m2 g−1. The ideal pH was found to be 7, with a saturation period of 90 minutes. The results indicate that MG removal increased accordingly as pH increased and also as adsorbent mass increased. The results of the isotherms showed that the Langmuir model is the most adequate, while the adsorption of MG was better characterized by the monolayer. The maximum adsorption capacity obtained from Langmuir is about 22.17 mg. g−1 at 25°C. Kinetic studies were indicated as the pseudo-second-order and most adequate model. He also revealed that intra-particle diffusion was not the only rate-controlling step. The thermodynamic data concluded that the adsorption was endothermic, i.e., adsorption is more favorable at high temperatures. Research has confirmed the applicability of diatomite as an effective adsorbent and an inexpensive process for removing hazardous materials.
{"title":"Thermodynamic and kinetic studies for the adsorption of malachite green from textile water, using a low-cost natural material, diatomite","authors":"M. Hadri, K. Draoui, L. Bounab, M. Hamdaoui, Hikmat Douhri, Imane Kouda, H. Zaitan","doi":"10.1680/jenes.22.00037","DOIUrl":"https://doi.org/10.1680/jenes.22.00037","url":null,"abstract":"Pollution by dyes is one of the main pollution of industrial effluents. In this research we examined Moroccan diatomite (DT) as a low cost adsorbent to remove one of these dangerous dyes, malachite green (MG). BET, SEM, pHpzc and XRD were used to assess the characterization of diatomite. The studies were carried out at different levels, of pH, diatomite mass and MG concentrations, with a temperature of 25°C. Equilibrium, kinetics and thermodynamic characteristics were also studied. Results show that the diatomite consisted of an integrated and nearly circular sieve plate with many small ordered pores, giving it a high specific surface area of 17.36 m2 g−1. The ideal pH was found to be 7, with a saturation period of 90 minutes. The results indicate that MG removal increased accordingly as pH increased and also as adsorbent mass increased. The results of the isotherms showed that the Langmuir model is the most adequate, while the adsorption of MG was better characterized by the monolayer. The maximum adsorption capacity obtained from Langmuir is about 22.17 mg. g−1 at 25°C. Kinetic studies were indicated as the pseudo-second-order and most adequate model. He also revealed that intra-particle diffusion was not the only rate-controlling step. The thermodynamic data concluded that the adsorption was endothermic, i.e., adsorption is more favorable at high temperatures. Research has confirmed the applicability of diatomite as an effective adsorbent and an inexpensive process for removing hazardous materials.","PeriodicalId":15665,"journal":{"name":"Journal of Environmental Engineering and Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43679420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study relates to synthesizing the bentonite support iron/copper nanoparticles by biosynthesis method using eucalyptus plant leaves extract which was then named (E-Fe/Cu@B-NPs). The synthesized E-Fe/Cu@B-NPs were examined by a set of experiments of heterogeneous Fenton-like process through removing direct blue 15 dye (DB15) from wastewater. The characterization methods were employed on E-Fe/Cu@B-NPs by scanning electron microscopy (SEM), BET, zeta potential (ZP), Fourier transform infrared (FT-IR) spectroscopy and atomic force microscopy (AFM) on the resultant nanoparticles were also checked to ensure the functional groups of the E-Fe/Cu@B-NPs. Some of the operation condition parameters were optimized using Box-Behnken design (BBD) in the batch experiments, these parameters were pH, H2O2 dosage, E-Fe/Cu@B-NPs dosage, initial DB15 concentration, and temperature. The result showed that 94.32% of 57.5 mg/L of DB15 was degraded within 60 minutes with an optimum H2O2 dosage of 7.5 mmol/L, E-Fe/Cu@B-NPs dosage 0.55 g/L, pH 3.5, and temperature 50°C. The kinetic study indicated that the DB15 degradation kinetics were fitted to the second-order kinetic model and the thermodynamic factors proved the non-spontaneous, endothermic, and endergonic process with activation energy E a of 62.961 kJ/mol.
{"title":"Green synthesis and application of Fe/Cu bimetallic nanoparticles for removal of direct blue dye by Fenton-like process","authors":"M. Atiya, A. K. Hassan, Zainab A. Mahmoud","doi":"10.1680/jenes.22.00025","DOIUrl":"https://doi.org/10.1680/jenes.22.00025","url":null,"abstract":"This study relates to synthesizing the bentonite support iron/copper nanoparticles by biosynthesis method using eucalyptus plant leaves extract which was then named (E-Fe/Cu@B-NPs). The synthesized E-Fe/Cu@B-NPs were examined by a set of experiments of heterogeneous Fenton-like process through removing direct blue 15 dye (DB15) from wastewater. The characterization methods were employed on E-Fe/Cu@B-NPs by scanning electron microscopy (SEM), BET, zeta potential (ZP), Fourier transform infrared (FT-IR) spectroscopy and atomic force microscopy (AFM) on the resultant nanoparticles were also checked to ensure the functional groups of the E-Fe/Cu@B-NPs. Some of the operation condition parameters were optimized using Box-Behnken design (BBD) in the batch experiments, these parameters were pH, H2O2 dosage, E-Fe/Cu@B-NPs dosage, initial DB15 concentration, and temperature. The result showed that 94.32% of 57.5 mg/L of DB15 was degraded within 60 minutes with an optimum H2O2 dosage of 7.5 mmol/L, E-Fe/Cu@B-NPs dosage 0.55 g/L, pH 3.5, and temperature 50°C. The kinetic study indicated that the DB15 degradation kinetics were fitted to the second-order kinetic model and the thermodynamic factors proved the non-spontaneous, endothermic, and endergonic process with activation energy E a of 62.961 kJ/mol.","PeriodicalId":15665,"journal":{"name":"Journal of Environmental Engineering and Science","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41875178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Goverdhan Singh, Nisha, Anil Kumar, P. Prasher, Harish Mudila
A variety of contaminants including heavy metals present in potable water cause numerous health hazards. Arsenic is studied as one of the chief hazardous heavy elements for human beings and other categories of life. Arsenic as a natural constituent of the earth’s crust is present in mineral rocks which are deposited via various natural processes. Apart, Arsenic is also added to groundwater anthropogenically via the burning of fossil fuels, arsenical agrochemicals, wood preservatives, etc. As III and As V are the toxic inorganic forms in aqueous solution and are responsible for cancer, arsenicosis, vascular diseases, and toxicity related to genes, cells, epidemiology, etc. In view of these problems, it is obligatory to detect and decontaminate the potable water from Arsenic contaminations. In this article, a brief description has been given of the most significant electrochemical method due to its advantages like robust, fast, accurate, and less complicated, also techniques such as DPV, SWV, SCP, ASV, and CV had kept the electrochemical method as a diverse and advance technique for sensing process. In addition, the details of the determination and decontamination of Arsenic in potable water via an electrochemical process with a particular focus on SWV and CV.
{"title":"Assessment of toxicity and electrochemical sensing of arsenic in aqueous sources","authors":"Goverdhan Singh, Nisha, Anil Kumar, P. Prasher, Harish Mudila","doi":"10.1680/jenes.22.00011","DOIUrl":"https://doi.org/10.1680/jenes.22.00011","url":null,"abstract":"A variety of contaminants including heavy metals present in potable water cause numerous health hazards. Arsenic is studied as one of the chief hazardous heavy elements for human beings and other categories of life. Arsenic as a natural constituent of the earth’s crust is present in mineral rocks which are deposited via various natural processes. Apart, Arsenic is also added to groundwater anthropogenically via the burning of fossil fuels, arsenical agrochemicals, wood preservatives, etc. As III and As V are the toxic inorganic forms in aqueous solution and are responsible for cancer, arsenicosis, vascular diseases, and toxicity related to genes, cells, epidemiology, etc. In view of these problems, it is obligatory to detect and decontaminate the potable water from Arsenic contaminations. In this article, a brief description has been given of the most significant electrochemical method due to its advantages like robust, fast, accurate, and less complicated, also techniques such as DPV, SWV, SCP, ASV, and CV had kept the electrochemical method as a diverse and advance technique for sensing process. In addition, the details of the determination and decontamination of Arsenic in potable water via an electrochemical process with a particular focus on SWV and CV.","PeriodicalId":15665,"journal":{"name":"Journal of Environmental Engineering and Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43755955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Wiafe, Sarah Fanny Hackman Duncan, E. Boakye, Samuel Yeboah Baako
The remediation of heavy metals from contaminated sites by the application of phytoextraction is proving to be efficient and cost-effective. A pot experiment was conducted to ascertain the effect of soil types (Sand, Loam and Clay) in the remediation of Cu, Cr and Hg using Phragmites australis. The results obtained throughout 60days of the plant’s growth showed that Cu absorption in the roots of the plant in sandy, loamy and clayey soils was; 47 mg/kg, 79.1 mg/kg and 96 mg/kg respectively. Cr absorption in the roots of the plant in sandy, loamy and clayey soils was 136 mg/kg, 180 mg/kg and 353 mg/kg respectively whilst that of Hg absorption in sand, loam and clay were 11.7 mg/kg, 14. mg/kg 8 and 19.3 mg/kg. The translocation factor for all the metals in the three soil types was less than one, however, the Bioaccumulation Factor (BAF) in all cases were more than one. The study concluded that the accumulation of Cr in the tissues of the plant was more pronounced than Cu and Hg. Clayey soil proved to be the favourable soil required for the effective remediation of the metals into the tissues of the plant.
{"title":"The effect of soil types on the phytoremediation of heavy metals by Phragmites australis","authors":"S. Wiafe, Sarah Fanny Hackman Duncan, E. Boakye, Samuel Yeboah Baako","doi":"10.1680/jenes.22.00020","DOIUrl":"https://doi.org/10.1680/jenes.22.00020","url":null,"abstract":"The remediation of heavy metals from contaminated sites by the application of phytoextraction is proving to be efficient and cost-effective. A pot experiment was conducted to ascertain the effect of soil types (Sand, Loam and Clay) in the remediation of Cu, Cr and Hg using Phragmites australis. The results obtained throughout 60days of the plant’s growth showed that Cu absorption in the roots of the plant in sandy, loamy and clayey soils was; 47 mg/kg, 79.1 mg/kg and 96 mg/kg respectively. Cr absorption in the roots of the plant in sandy, loamy and clayey soils was 136 mg/kg, 180 mg/kg and 353 mg/kg respectively whilst that of Hg absorption in sand, loam and clay were 11.7 mg/kg, 14. mg/kg 8 and 19.3 mg/kg. The translocation factor for all the metals in the three soil types was less than one, however, the Bioaccumulation Factor (BAF) in all cases were more than one. The study concluded that the accumulation of Cr in the tissues of the plant was more pronounced than Cu and Hg. Clayey soil proved to be the favourable soil required for the effective remediation of the metals into the tissues of the plant.","PeriodicalId":15665,"journal":{"name":"Journal of Environmental Engineering and Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43519248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ruqaya Al-Syabi, A. Izady, M. Baawain, A. Al-Mamun, Mingjie Chen
Management of municipal solid waste leachate has become an urgent environmental problem in many countries due to the high growth of population and consumption trends. Advanced oxidation processes (AOPs) are efficient methods to treat leachate because of their high ability to reduce unpleasant parameters. Although the simultaneous application of different AOPs methods is more effective than a single process, the simultaneous application of AOPs for the treatment of municipal solid waste leachate has received little attention. To fill this knowledge gap, this study presents the simultaneous application of AOPs methods to treat municipal solid waste leachate. The efficiency of AOPs was studied in terms of organic compounds such as chemical oxygen demand (COD) and total organic carbon (TOC). Leachate samples were collected from the Barka landfill, which is located in the northeast of Oman. Four combinations of applied AOPs methods (e.g. ozone (O3), hydrogen peroxide (H2O2), and ultraviolet (UV)) in this study resulted in the order of H2O2/O3/UV > H2O2/O3 > O3/UV3 > H2O2/UV according to the COD removal efficiency. Combining these AOPs methods resulted in about 1.5 times increase in COD removal (56.62%) and 1.9 times increase in TOC removal (39.34%) compared to the individual applications.
{"title":"Advanced oxidation processes for treating raw leachate: an experimental study","authors":"Ruqaya Al-Syabi, A. Izady, M. Baawain, A. Al-Mamun, Mingjie Chen","doi":"10.1680/jenes.22.00016","DOIUrl":"https://doi.org/10.1680/jenes.22.00016","url":null,"abstract":"Management of municipal solid waste leachate has become an urgent environmental problem in many countries due to the high growth of population and consumption trends. Advanced oxidation processes (AOPs) are efficient methods to treat leachate because of their high ability to reduce unpleasant parameters. Although the simultaneous application of different AOPs methods is more effective than a single process, the simultaneous application of AOPs for the treatment of municipal solid waste leachate has received little attention. To fill this knowledge gap, this study presents the simultaneous application of AOPs methods to treat municipal solid waste leachate. The efficiency of AOPs was studied in terms of organic compounds such as chemical oxygen demand (COD) and total organic carbon (TOC). Leachate samples were collected from the Barka landfill, which is located in the northeast of Oman. Four combinations of applied AOPs methods (e.g. ozone (O3), hydrogen peroxide (H2O2), and ultraviolet (UV)) in this study resulted in the order of H2O2/O3/UV > H2O2/O3 > O3/UV3 > H2O2/UV according to the COD removal efficiency. Combining these AOPs methods resulted in about 1.5 times increase in COD removal (56.62%) and 1.9 times increase in TOC removal (39.34%) compared to the individual applications.","PeriodicalId":15665,"journal":{"name":"Journal of Environmental Engineering and Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45198447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Organic compounds like dyes and heavy metal ions are common pollutants in wastewater that have become a global problem. Adsorption has proven to be a successful technique in removing organic species such as methylene blue. Geothermal solid waste has the potential to be used as an adsorbent due to its silica content. Silica compound in the geothermal waste is the potential to be developed as porous material. Aluminum hydroxide and geothermal solid waste were added to the aqueous alkali (NaOH) in the continuous stirred tank reactor, then resulted an amorphous mesoporous material of the natrolite phase. The performance of the geoadsorbent was evaluated through the removal of various concentrations of methylene blue, and isotherm adsorption models evaluated the data. The adsorption mechanisms of the MB removal by geoadsorbent shown by FT-IR spectra are electrostatic attraction and hydrogen-bond formations. The geoadsorbent can remove methylene blue up to 84.449%, which the initial concentration of MB is highly dependent on adsorption. The Langmuir isotherm model provides the most accurate representation of methylene blue adsorption as a result of the physical process. with a correlation coefficient of 0.971.
{"title":"Synthesis of amorphous adsorbent derived from geothermal solid waste for methylene blue removal","authors":"J. Philia, W. Widayat, S. Sulardjaka","doi":"10.1680/jenes.21.00082","DOIUrl":"https://doi.org/10.1680/jenes.21.00082","url":null,"abstract":"Organic compounds like dyes and heavy metal ions are common pollutants in wastewater that have become a global problem. Adsorption has proven to be a successful technique in removing organic species such as methylene blue. Geothermal solid waste has the potential to be used as an adsorbent due to its silica content. Silica compound in the geothermal waste is the potential to be developed as porous material. Aluminum hydroxide and geothermal solid waste were added to the aqueous alkali (NaOH) in the continuous stirred tank reactor, then resulted an amorphous mesoporous material of the natrolite phase. The performance of the geoadsorbent was evaluated through the removal of various concentrations of methylene blue, and isotherm adsorption models evaluated the data. The adsorption mechanisms of the MB removal by geoadsorbent shown by FT-IR spectra are electrostatic attraction and hydrogen-bond formations. The geoadsorbent can remove methylene blue up to 84.449%, which the initial concentration of MB is highly dependent on adsorption. The Langmuir isotherm model provides the most accurate representation of methylene blue adsorption as a result of the physical process. with a correlation coefficient of 0.971.","PeriodicalId":15665,"journal":{"name":"Journal of Environmental Engineering and Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44435279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Removal of the dye Methylene Blue from water at different concentrations, adsorbent pH and times was investigated. The natural clay was treated by cation exchange, which was confirmed by XRD and IR analyzes. Experimental results have shown that the high pH promotes adsorption. The adsorption isotherms are described by the equation of Langmuir and Freundlich isotherms. It is important to note that the quantity of CaO corresponding to calcite is higher in natural clay (9.7 % by weight) compared to Na-montmorillonite fraction (2.01% weight). It clearly shows that the clay dhkl spacing increased from d = 13.58 to d = 17 Å, which could be attributed to natural clay and Na-montmorillonite which confirms good clay purification. The maximum capacity of dyes adsorbed on Natural clay and Na-monmorillonite (Qmax) are (142.85 to 250 mg g−1) and (80 to 277.77 mg g−1) respectively. The correlation coefficients R2 = 0.99 of the Freundlich and Langmuir model for natural clays and Na-montmorillonte have the same values this indicates that the two models are best for the adsorption of dye Methylene Blue on natural clay and Na -montmorillonite.
{"title":"Adsorption of dye using natural clay from water","authors":"M. Bourouiss, M. Djebbar, F. Djafri","doi":"10.1680/jenes.21.00051","DOIUrl":"https://doi.org/10.1680/jenes.21.00051","url":null,"abstract":"Removal of the dye Methylene Blue from water at different concentrations, adsorbent pH and times was investigated. The natural clay was treated by cation exchange, which was confirmed by XRD and IR analyzes. Experimental results have shown that the high pH promotes adsorption. The adsorption isotherms are described by the equation of Langmuir and Freundlich isotherms. It is important to note that the quantity of CaO corresponding to calcite is higher in natural clay (9.7 % by weight) compared to Na-montmorillonite fraction (2.01% weight). It clearly shows that the clay dhkl spacing increased from d = 13.58 to d = 17 Å, which could be attributed to natural clay and Na-montmorillonite which confirms good clay purification. The maximum capacity of dyes adsorbed on Natural clay and Na-monmorillonite (Qmax) are (142.85 to 250 mg g−1) and (80 to 277.77 mg g−1) respectively. The correlation coefficients R2 = 0.99 of the Freundlich and Langmuir model for natural clays and Na-montmorillonte have the same values this indicates that the two models are best for the adsorption of dye Methylene Blue on natural clay and Na -montmorillonite.","PeriodicalId":15665,"journal":{"name":"Journal of Environmental Engineering and Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46874347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cornelius B. Mushumbusi, G. Minja, E. Mogusu, D. Kimaro
The global demand of plastics has increased majorly because of their versatility, light weight, strength and cost-effectiveness. Africa is ranked top in mismanagement of plastics waste resulting to plastic problem in the environment. Nevertheless, plastics produce micro-plastics through degradation and fragmentation of plastic debris largely from anthropogenic sources. Micro-plastics have become ubiquitous in the natural environment and terrestrial environment is the major source. The propensity of micro-plastics to adsorb and concentrate persistent organic pollutants (POPs) provides potential health effects in the different tropical levels of organisms both in aquatic and territorial environments. Thus, the fate of micro-plastics is increasingly becoming a global concern. Despite the numerous global studies on the impact of micro-plastics in the environment, there is insufficient data available on the occurrence, distribution of micro-plastics and associated health effects in aquatic ecosystems in Africa. The reviewed research articles from 2000 – 2021 provide a summary of the current knowledge on the occurrence and distribution of micro-plastics, analytical approaches used to detect and quantify micro-plastics, associated health effects and mitigation measures through government policy to ban plastic use in Africa. The findings presented, provide a platform for future research to focus on the associated effects of adsorbed and concentrated persistent organic pollutants on micro-plastics in aquatic environments in Africa. With the evidence presented policy makers will make more informed decision on the future of plastics in Africa. We recommend improving information and expanding knowledge through research on the fate and potential ecological impact of micro-plastics in aquatic environments in Africa.
{"title":"Micro-plastic pollution in aquatic environment in Africa: status, challenges and emerging opportunities","authors":"Cornelius B. Mushumbusi, G. Minja, E. Mogusu, D. Kimaro","doi":"10.1680/jenes.22.00003","DOIUrl":"https://doi.org/10.1680/jenes.22.00003","url":null,"abstract":"The global demand of plastics has increased majorly because of their versatility, light weight, strength and cost-effectiveness. Africa is ranked top in mismanagement of plastics waste resulting to plastic problem in the environment. Nevertheless, plastics produce micro-plastics through degradation and fragmentation of plastic debris largely from anthropogenic sources. Micro-plastics have become ubiquitous in the natural environment and terrestrial environment is the major source. The propensity of micro-plastics to adsorb and concentrate persistent organic pollutants (POPs) provides potential health effects in the different tropical levels of organisms both in aquatic and territorial environments. Thus, the fate of micro-plastics is increasingly becoming a global concern. Despite the numerous global studies on the impact of micro-plastics in the environment, there is insufficient data available on the occurrence, distribution of micro-plastics and associated health effects in aquatic ecosystems in Africa. The reviewed research articles from 2000 – 2021 provide a summary of the current knowledge on the occurrence and distribution of micro-plastics, analytical approaches used to detect and quantify micro-plastics, associated health effects and mitigation measures through government policy to ban plastic use in Africa. The findings presented, provide a platform for future research to focus on the associated effects of adsorbed and concentrated persistent organic pollutants on micro-plastics in aquatic environments in Africa. With the evidence presented policy makers will make more informed decision on the future of plastics in Africa. We recommend improving information and expanding knowledge through research on the fate and potential ecological impact of micro-plastics in aquatic environments in Africa.","PeriodicalId":15665,"journal":{"name":"Journal of Environmental Engineering and Science","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42678128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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