Pub Date : 2023-01-19DOI: 10.1080/26395940.2023.2168216
Yiqun Liao, Ying Tang, Shiwei Wang, Hui-Ming Su, Jing Chen, Da-wei Zhang, Jinfeng Wu, Dinggang Zhou, M. Yan, Li-li Liu
ABSTRACT The plant hormone abscisic acid (ABA) has been proved to be a key protector against abiotic stresses at appropriate concentrations. This study aimed to investigate the role of ABA in alleviating cadmium (Cd) stress in two Brassica napus of oil-vegetable dual-purpose (Youfei 1 and Xiangyou 787). Cd stress disturbed the normal growth of rapeseed, however, specific ABA concentrations could alleviate the effects of Cd stress in B. napus. The results confirmed that exogenous ABA mitigates the negative effects of Cd-induced plant toxicity in B. napus by increasing growth traits, enhancing pigment molecules, enhancing gas exchange in leaves, as well as regulating antioxidation and the expression levels of genes related to Cd stress. This study indicated that ABA played an important protective role in regulating cadmium resistance in Brassica napus, and provided basic data for its application in actual production.
{"title":"Abscisic acid modulates differential physiological and biochemical responses to cadmium stress in Brassica napus","authors":"Yiqun Liao, Ying Tang, Shiwei Wang, Hui-Ming Su, Jing Chen, Da-wei Zhang, Jinfeng Wu, Dinggang Zhou, M. Yan, Li-li Liu","doi":"10.1080/26395940.2023.2168216","DOIUrl":"https://doi.org/10.1080/26395940.2023.2168216","url":null,"abstract":"ABSTRACT The plant hormone abscisic acid (ABA) has been proved to be a key protector against abiotic stresses at appropriate concentrations. This study aimed to investigate the role of ABA in alleviating cadmium (Cd) stress in two Brassica napus of oil-vegetable dual-purpose (Youfei 1 and Xiangyou 787). Cd stress disturbed the normal growth of rapeseed, however, specific ABA concentrations could alleviate the effects of Cd stress in B. napus. The results confirmed that exogenous ABA mitigates the negative effects of Cd-induced plant toxicity in B. napus by increasing growth traits, enhancing pigment molecules, enhancing gas exchange in leaves, as well as regulating antioxidation and the expression levels of genes related to Cd stress. This study indicated that ABA played an important protective role in regulating cadmium resistance in Brassica napus, and provided basic data for its application in actual production.","PeriodicalId":11785,"journal":{"name":"Environmental Pollutants and Bioavailability","volume":"174 5 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89379604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-04DOI: 10.1080/26395940.2022.2163922
Saad Melhi
ABSTRACT Herein, succinic acid functionalized Fe3O4@AMPA nanocomposite was synthesized as an effective adsorbent and used for the efficient removal of Cd(II) ions from aqueous media. Zeta potential, BET, TEM, TGA, and FTIR spectra were applied to characterize the Fe3O4@AMPA@SA nanocomposite. According to the BET analysis, the surface area of Fe3O4@AMPA@SA was found to be 43 m2/g. The influence of pH value, initial Cd(II) concentration, adsorbent dosage, temperature, and contact time on the adsorption process was achieved via the batch experiment method. The result showed that the optimal parameters were 6, 250 mg/L, 0.03 g/50 mL, 150 min, and 25°C, respectively. The experimental data fitted well to the Langmuir isotherm and the pseudo-first-order models. The maximum monolayer adsorption capacity of Cd(II) ions was 265 mg g−1. The adsorption mechanism of Cd(II) on magnetic nanocomposite is physical adsorption. The Fe3O4@AMPA@SA nanocomposite shows excellent reusability with a removal efficiency of 81.4% after three cycles. GRAPHICAL ABSTRACT
{"title":"Recyclable magnetic nanocomposites for efficient removal of cadmium ions from water: performance, mechanism and isotherm studies","authors":"Saad Melhi","doi":"10.1080/26395940.2022.2163922","DOIUrl":"https://doi.org/10.1080/26395940.2022.2163922","url":null,"abstract":"ABSTRACT Herein, succinic acid functionalized Fe3O4@AMPA nanocomposite was synthesized as an effective adsorbent and used for the efficient removal of Cd(II) ions from aqueous media. Zeta potential, BET, TEM, TGA, and FTIR spectra were applied to characterize the Fe3O4@AMPA@SA nanocomposite. According to the BET analysis, the surface area of Fe3O4@AMPA@SA was found to be 43 m2/g. The influence of pH value, initial Cd(II) concentration, adsorbent dosage, temperature, and contact time on the adsorption process was achieved via the batch experiment method. The result showed that the optimal parameters were 6, 250 mg/L, 0.03 g/50 mL, 150 min, and 25°C, respectively. The experimental data fitted well to the Langmuir isotherm and the pseudo-first-order models. The maximum monolayer adsorption capacity of Cd(II) ions was 265 mg g−1. The adsorption mechanism of Cd(II) on magnetic nanocomposite is physical adsorption. The Fe3O4@AMPA@SA nanocomposite shows excellent reusability with a removal efficiency of 81.4% after three cycles. GRAPHICAL ABSTRACT","PeriodicalId":11785,"journal":{"name":"Environmental Pollutants and Bioavailability","volume":"7 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2023-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74060519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACT Pteris vittata, the first discovered arsenic (As) hyperaccumulator, has great potential in As-contaminated soil remediation. However, as a fern, it is sensitive to water deficiency. In this study, acetic acid and calcium acetate were added to As-contaminated soils in pots to investigate their effects on the drought tolerance, growth and As remediation efficiency of P. vittata. Comparing with the plants pretreated with municipal drinking water, plants pretreated with 20 mM acetic acid or calcium acetate solutions exhibited strikingly increased drought tolerance. In addition, 20 mM calcium acetate significantly increased shoot As concentration by 165% and the total shoot As amount by 55.1%, probably due to the elevated soil pH and a subsequent 14.2% increase of soil available As. Taken together, this study demonstrates that the appropriate application of calcium acetate can enhance both drought tolerance and As accumulation in P. vittata, which is of significance for the phytoremediation.
{"title":"Calcium acetate enhances both drought tolerance and arsenic accumulation in Pteris vittata","authors":"Guosheng Wang, Zhen Wang, Fei Zhao, Junxiu Chen, Yanshan Chen","doi":"10.1080/26395940.2022.2161947","DOIUrl":"https://doi.org/10.1080/26395940.2022.2161947","url":null,"abstract":"ABSTRACT Pteris vittata, the first discovered arsenic (As) hyperaccumulator, has great potential in As-contaminated soil remediation. However, as a fern, it is sensitive to water deficiency. In this study, acetic acid and calcium acetate were added to As-contaminated soils in pots to investigate their effects on the drought tolerance, growth and As remediation efficiency of P. vittata. Comparing with the plants pretreated with municipal drinking water, plants pretreated with 20 mM acetic acid or calcium acetate solutions exhibited strikingly increased drought tolerance. In addition, 20 mM calcium acetate significantly increased shoot As concentration by 165% and the total shoot As amount by 55.1%, probably due to the elevated soil pH and a subsequent 14.2% increase of soil available As. Taken together, this study demonstrates that the appropriate application of calcium acetate can enhance both drought tolerance and As accumulation in P. vittata, which is of significance for the phytoremediation.","PeriodicalId":11785,"journal":{"name":"Environmental Pollutants and Bioavailability","volume":"95 2 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90988173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-21DOI: 10.1080/26395940.2022.2157332
Yiqing Pei, Yiming Yang, Lihua Chen, Yipeng Yang, Lingyan Song
ABSTRACT The indoor simulation remediation of chromium-contaminated soil in semi-arid areas with chemical reduction-stabilization method was conducted to study the effects of remediation agent types and dosage, water (mL)-soil (g) ratio and remediation time on reduction and stabilization efficiency of the chromium-contaminated soil. The results showed that FeSO4 was the most effective reduction agent for reduction of Cr(VI) in soil. The optimally combined chemical reduction-stabilization remediation conditions were 2.5 times theoretical reaction dosage FeSO4 and 8% of modified corn stover biochar (KBC), 50% of water-soil ratio, and 7 days remediation time. The total Cr and Cr(VI) leaching concentrations and Cr(VI) content in soil were reduced from 65.65 mg L-1, 61.98 mg L-1 and 1000.00 mg kg-1 without treatment to 0.114 mg L-1, 0.125 mg L-1 and 18.909 mg kg-1 after treatment, respectively. They were according with comprehensive wastewater discharge standards and construction land soil contamination risk control standards, respectively. Graphical abstract
{"title":"Remediation of chromium-contaminated soil in semi-arid areas by combined chemical reduction and stabilization","authors":"Yiqing Pei, Yiming Yang, Lihua Chen, Yipeng Yang, Lingyan Song","doi":"10.1080/26395940.2022.2157332","DOIUrl":"https://doi.org/10.1080/26395940.2022.2157332","url":null,"abstract":"ABSTRACT The indoor simulation remediation of chromium-contaminated soil in semi-arid areas with chemical reduction-stabilization method was conducted to study the effects of remediation agent types and dosage, water (mL)-soil (g) ratio and remediation time on reduction and stabilization efficiency of the chromium-contaminated soil. The results showed that FeSO4 was the most effective reduction agent for reduction of Cr(VI) in soil. The optimally combined chemical reduction-stabilization remediation conditions were 2.5 times theoretical reaction dosage FeSO4 and 8% of modified corn stover biochar (KBC), 50% of water-soil ratio, and 7 days remediation time. The total Cr and Cr(VI) leaching concentrations and Cr(VI) content in soil were reduced from 65.65 mg L-1, 61.98 mg L-1 and 1000.00 mg kg-1 without treatment to 0.114 mg L-1, 0.125 mg L-1 and 18.909 mg kg-1 after treatment, respectively. They were according with comprehensive wastewater discharge standards and construction land soil contamination risk control standards, respectively. Graphical abstract","PeriodicalId":11785,"journal":{"name":"Environmental Pollutants and Bioavailability","volume":"20 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2022-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85507343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-13DOI: 10.1080/26395940.2022.2156397
Ziyou Bai, Fuzhong Wu, Yinping He, Z. Han
ABSTRACT We collected tailings samples to assess and analyze the concentrations of heavy metals, pollution levels, and the risks posed by heavy metals in the tailings of the Zuoxiguo antimony mine to ecological and human health. The samples were selected by employing the serpentine sampling method, which were treated heavy-metal digestion method. Cu, Cr, Cd, and Pb were determined via inductively coupled plasma mass spectrometry, As and Sb were identified through atomic fluorescence, the average concentration of heavy metals in the tailings is: Sb (5902.77 mg/kg)>As (412.53 mg/kg)>Zn (155.42 mg/kg)>Cr (143.32 mg/kg)>Cu (92.68 mg/kg)>Pb (48.49 mg/kg)>Cd (3.29 mg/kg). The average Nemerow pollution index (NPI) was 553.06, indicating a high level of pollution. The average integrated ecological risk index (RI) result was 5395.94, indicating a serious threat to the study area’s ecology. The Non-carcinogenic health-risk index (HQ) suggested that all heavy metals posed a higher risk to children than to adults under different modes of exposure, with oral intake of Sb and As posing a non-carcinogenic risk to both adults and children, For adults, HQing value of Sb and As are 22.07 and 2.13, respectively; for child, HQing value of Sb and As are 178 and 16.29, which are exceeding limitation of 1. Dermal exposure posing a non-carcinogenic risk to child, for child, HQderm value of Sb and As are 14.96 and 3.32, which are also exceeding limitation of 1. The findings suggest that Sb and As pose serious threats to both the ecological environment and human health and that the local government should focus on Sb and As management for regions.
{"title":"Pollution and risk assessment of heavy metals in Zuoxiguo antimony mining area, southwest China","authors":"Ziyou Bai, Fuzhong Wu, Yinping He, Z. Han","doi":"10.1080/26395940.2022.2156397","DOIUrl":"https://doi.org/10.1080/26395940.2022.2156397","url":null,"abstract":"ABSTRACT We collected tailings samples to assess and analyze the concentrations of heavy metals, pollution levels, and the risks posed by heavy metals in the tailings of the Zuoxiguo antimony mine to ecological and human health. The samples were selected by employing the serpentine sampling method, which were treated heavy-metal digestion method. Cu, Cr, Cd, and Pb were determined via inductively coupled plasma mass spectrometry, As and Sb were identified through atomic fluorescence, the average concentration of heavy metals in the tailings is: Sb (5902.77 mg/kg)>As (412.53 mg/kg)>Zn (155.42 mg/kg)>Cr (143.32 mg/kg)>Cu (92.68 mg/kg)>Pb (48.49 mg/kg)>Cd (3.29 mg/kg). The average Nemerow pollution index (NPI) was 553.06, indicating a high level of pollution. The average integrated ecological risk index (RI) result was 5395.94, indicating a serious threat to the study area’s ecology. The Non-carcinogenic health-risk index (HQ) suggested that all heavy metals posed a higher risk to children than to adults under different modes of exposure, with oral intake of Sb and As posing a non-carcinogenic risk to both adults and children, For adults, HQing value of Sb and As are 22.07 and 2.13, respectively; for child, HQing value of Sb and As are 178 and 16.29, which are exceeding limitation of 1. Dermal exposure posing a non-carcinogenic risk to child, for child, HQderm value of Sb and As are 14.96 and 3.32, which are also exceeding limitation of 1. The findings suggest that Sb and As pose serious threats to both the ecological environment and human health and that the local government should focus on Sb and As management for regions.","PeriodicalId":11785,"journal":{"name":"Environmental Pollutants and Bioavailability","volume":"22 1","pages":""},"PeriodicalIF":3.3,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75391052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1080/26395940.2022.2152730
Imen Askri, Houda Ben Lamine, Raoudha Smiti, O. Tebourbi, Dorsaf Hallègue, M. Sakly, K. Ben Rhouma
ABSTRACT The use of pesticides has been widespread throughout the world. The intensive and uncontrolled use of these chemical substances has harmful effects on human health and the environment. Imidacloprid and Deltametrin are among the insecticides most commonly used. Our study evaluated the potential effects on hepatic function of Imidacloprid and Deltametrin in rats after subacute toxicity. Forty adult male Wistar rats were randomly divided into four groups of 10 rats each: the 1st group was the control; the 2nd group was exposed to Imidacloprid (25 mg/kg); the 3rd group received Deltametrin (200 mg/kg) and the 4th group received a mixture (Imidacloprid + Deltametrin) with the same dose for 30 days. The results showed that subacute exposure of rats to these insecticides induced a decrease in relative liver weights. On the other hand, hepatic activity was altered; however, there was a significant rise at the level of hepatic enzymes, blood sugar and lipids versus decreased protein in treated rats. These modifications were accompanied by alterations of the hepatic tissue structure in the treated rats, compared to the controls which remained intact. The alterations and lesions were more marked in the animals receiving the Imidacloprid and Deltametrin mixture. Subacute toxicity of Imidacloprid and Deltametrin, used individually or together, disturb liver function in rats and the treatment with the combination of the two worsens the condition.
{"title":"Effect of intoxication by gavage with pyrethroid and neonicotinoid insecticides on the liver in adult male rats of the Wistar strain","authors":"Imen Askri, Houda Ben Lamine, Raoudha Smiti, O. Tebourbi, Dorsaf Hallègue, M. Sakly, K. Ben Rhouma","doi":"10.1080/26395940.2022.2152730","DOIUrl":"https://doi.org/10.1080/26395940.2022.2152730","url":null,"abstract":"ABSTRACT The use of pesticides has been widespread throughout the world. The intensive and uncontrolled use of these chemical substances has harmful effects on human health and the environment. Imidacloprid and Deltametrin are among the insecticides most commonly used. Our study evaluated the potential effects on hepatic function of Imidacloprid and Deltametrin in rats after subacute toxicity. Forty adult male Wistar rats were randomly divided into four groups of 10 rats each: the 1st group was the control; the 2nd group was exposed to Imidacloprid (25 mg/kg); the 3rd group received Deltametrin (200 mg/kg) and the 4th group received a mixture (Imidacloprid + Deltametrin) with the same dose for 30 days. The results showed that subacute exposure of rats to these insecticides induced a decrease in relative liver weights. On the other hand, hepatic activity was altered; however, there was a significant rise at the level of hepatic enzymes, blood sugar and lipids versus decreased protein in treated rats. These modifications were accompanied by alterations of the hepatic tissue structure in the treated rats, compared to the controls which remained intact. The alterations and lesions were more marked in the animals receiving the Imidacloprid and Deltametrin mixture. Subacute toxicity of Imidacloprid and Deltametrin, used individually or together, disturb liver function in rats and the treatment with the combination of the two worsens the condition.","PeriodicalId":11785,"journal":{"name":"Environmental Pollutants and Bioavailability","volume":"64 1","pages":"564 - 574"},"PeriodicalIF":3.3,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75210338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACT The effects of rhamnolipid chelating La (III) or Nd (III) on m-dichlorobenzene removal and biofilm growth were investigated. The rhamnolipid chelating La (III) or Nd (III) significantly increased the average m-dichlorobenzene elimination capacity by 24% and 29%, respectively, on day 70–130, and the average wet weights of biomass ranged from 11 kg/m3 to 15 kg/m3 in BTFs on day 100–180 at an inlet load of at 47–98 gm3/h and an EBRT of 60s-90s. Microbial community functional genes about biofilm growth and m-dichlorobenzene removal were also increased. In addition, the rhamnolipid chelating La (III) or Nd (III) can improve the membrane permeability, extracellular polymeric substance (EPS) production, catechol 2,3 dioxygenase (C23O) enzyme, and chlorobenzene dioxygenase activity. These results demonstrate that rhamnolipid chelating La (III) or Nd (III) have the potential to improve the performance of BTFs treating hydrophobic and highly toxic VOCs. Graphical Abstract
{"title":"Synchronously enhanced biofilm formation and m-dichlorobenzene removal in biotrickling filters by rhamnolipid chelating rare earth elements","authors":"Bairen Yang, Jiajie Wang, Qingqing Shang, Zhuqiu Sun, Yifan Wu","doi":"10.1080/26395940.2022.2151516","DOIUrl":"https://doi.org/10.1080/26395940.2022.2151516","url":null,"abstract":"ABSTRACT The effects of rhamnolipid chelating La (III) or Nd (III) on m-dichlorobenzene removal and biofilm growth were investigated. The rhamnolipid chelating La (III) or Nd (III) significantly increased the average m-dichlorobenzene elimination capacity by 24% and 29%, respectively, on day 70–130, and the average wet weights of biomass ranged from 11 kg/m3 to 15 kg/m3 in BTFs on day 100–180 at an inlet load of at 47–98 gm3/h and an EBRT of 60s-90s. Microbial community functional genes about biofilm growth and m-dichlorobenzene removal were also increased. In addition, the rhamnolipid chelating La (III) or Nd (III) can improve the membrane permeability, extracellular polymeric substance (EPS) production, catechol 2,3 dioxygenase (C23O) enzyme, and chlorobenzene dioxygenase activity. These results demonstrate that rhamnolipid chelating La (III) or Nd (III) have the potential to improve the performance of BTFs treating hydrophobic and highly toxic VOCs. Graphical Abstract","PeriodicalId":11785,"journal":{"name":"Environmental Pollutants and Bioavailability","volume":"67 1","pages":"575 - 585"},"PeriodicalIF":3.3,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76842520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-27DOI: 10.1080/26395940.2022.2151515
Y. Liang, Liang Ding, Qing Song, Ben Zhao, Siyu Wang, Sheng Liu
ABSTRACT Biodegradation could remove atrazine from contaminated soil and water. In this work, three isolated bacterial strains D2, D6, and D17 were identified as Solibacillus, Bacillus, and Arthrobacter, respectively.They can rapidly degrade atrazine and effectively alleviate the phytotoxic effects of atrazine, with degradation efficiency following D2> D6>D17. Besides having the highest amount of exoenzyme and endoenzyme, the highest exoenzyme ratio in strain D2 also contributed to the highest atrazine degradation, as exoenzyme facilitated the direct reaction with atrazine in a short time and alleviated the stress of pollutant on strains, while more endoenzyme for D6 and D17 indicated degradation acted only after across the membrane, which needs more time to degradation. Furthermore, trzN in strain D2 can degrade atrazine to hydroxyatrazine. The biodegradation product of atrazine by strain D2 was cyanuric acid via dichlorination, hydroxylation, hydrodealkylation, methylation, dealkylation, elimination, and hydrolysis.
{"title":"Biodegradation of atrazine by three strains: identification, enzymes activities, and biodegradation mechanism","authors":"Y. Liang, Liang Ding, Qing Song, Ben Zhao, Siyu Wang, Sheng Liu","doi":"10.1080/26395940.2022.2151515","DOIUrl":"https://doi.org/10.1080/26395940.2022.2151515","url":null,"abstract":"ABSTRACT Biodegradation could remove atrazine from contaminated soil and water. In this work, three isolated bacterial strains D2, D6, and D17 were identified as Solibacillus, Bacillus, and Arthrobacter, respectively.They can rapidly degrade atrazine and effectively alleviate the phytotoxic effects of atrazine, with degradation efficiency following D2> D6>D17. Besides having the highest amount of exoenzyme and endoenzyme, the highest exoenzyme ratio in strain D2 also contributed to the highest atrazine degradation, as exoenzyme facilitated the direct reaction with atrazine in a short time and alleviated the stress of pollutant on strains, while more endoenzyme for D6 and D17 indicated degradation acted only after across the membrane, which needs more time to degradation. Furthermore, trzN in strain D2 can degrade atrazine to hydroxyatrazine. The biodegradation product of atrazine by strain D2 was cyanuric acid via dichlorination, hydroxylation, hydrodealkylation, methylation, dealkylation, elimination, and hydrolysis.","PeriodicalId":11785,"journal":{"name":"Environmental Pollutants and Bioavailability","volume":"155 1","pages":"549 - 563"},"PeriodicalIF":3.3,"publicationDate":"2022-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77768978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-20DOI: 10.1080/26395940.2022.2147098
M. Nur, I. N. Djarot, P. Boelen, Hadiyanto, H. J. Heeres
ABSTRACT POME is an excellent cultivation medium for the production of microalgae because it includes high macro and micronutrients. Nevertheless, microalga cultivation is laborious to maintain under outdoor condition. The aim of this reseasch was to evaluate the potency of co-cultivation strategy to improve growth and lipid production of mixed algae when growing on POME under dynamic outdoor condition. Cultivation was done in outdoor condition by comparing synthetic medium and POME medium, and optimizing the enviromental and nutritional conditions by using Box-behnken response surface methodology (RSM). Results showed that high growth rate (0.35/d) and lipid (40%) were achieved when 75% POME fraction, 30 PSU salinity, and 450 mg/L urea were used. The increasing POME fraction and urea addition enhanced SFA formation to MUFA and PUFA in the fatty acid profiles. We conclude that co-cultivation strategy on POME could promote growth rate and lipid production of mixed algae under outdoor condition.
{"title":"Co-cultivation of microalgae growing on palm oil mill effluent under outdoor condition for lipid production","authors":"M. Nur, I. N. Djarot, P. Boelen, Hadiyanto, H. J. Heeres","doi":"10.1080/26395940.2022.2147098","DOIUrl":"https://doi.org/10.1080/26395940.2022.2147098","url":null,"abstract":"ABSTRACT POME is an excellent cultivation medium for the production of microalgae because it includes high macro and micronutrients. Nevertheless, microalga cultivation is laborious to maintain under outdoor condition. The aim of this reseasch was to evaluate the potency of co-cultivation strategy to improve growth and lipid production of mixed algae when growing on POME under dynamic outdoor condition. Cultivation was done in outdoor condition by comparing synthetic medium and POME medium, and optimizing the enviromental and nutritional conditions by using Box-behnken response surface methodology (RSM). Results showed that high growth rate (0.35/d) and lipid (40%) were achieved when 75% POME fraction, 30 PSU salinity, and 450 mg/L urea were used. The increasing POME fraction and urea addition enhanced SFA formation to MUFA and PUFA in the fatty acid profiles. We conclude that co-cultivation strategy on POME could promote growth rate and lipid production of mixed algae under outdoor condition.","PeriodicalId":11785,"journal":{"name":"Environmental Pollutants and Bioavailability","volume":"23 1","pages":"537 - 548"},"PeriodicalIF":3.3,"publicationDate":"2022-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79617363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACT Herein, a novel photocatalyst of Ag3PO4/Bi2WO6 was developed via hydrothermal and precipitation method. Its structure and morphology was characterized through XRD, XPS, SEM, TEM, HRTEM, BET, UV-vis DRS, PL, and so on. By employing toluene photodegradation experiment under visible light, the photocatalytic performance of Ag3PO4/Bi2WO6 was proved to be better than Ag3PO4 and Bi2WO6 alone due to the efficient separation of electron-hole pairs. When the molar ratio of Ag3PO4 to Bi2WO6 was 1:2, the degradation rate of toluene could reach 80% within 180 min. This study provided a new idea for the simple preparation of cheap and efficient nanocomposite materials for VOCs degradation by visible light.
{"title":"Preparation of a visible light catalyst of novel Bi2WO6 loaded Ag3PO4 heterojunction and its efficient removal of toluene","authors":"Qi Zhang, Yuyu Zhu, Liangyun Yu, Xuexing Dong, Yifan Wu, Bairen Yang, Qixin Xu","doi":"10.1080/26395940.2022.2146000","DOIUrl":"https://doi.org/10.1080/26395940.2022.2146000","url":null,"abstract":"ABSTRACT Herein, a novel photocatalyst of Ag3PO4/Bi2WO6 was developed via hydrothermal and precipitation method. Its structure and morphology was characterized through XRD, XPS, SEM, TEM, HRTEM, BET, UV-vis DRS, PL, and so on. By employing toluene photodegradation experiment under visible light, the photocatalytic performance of Ag3PO4/Bi2WO6 was proved to be better than Ag3PO4 and Bi2WO6 alone due to the efficient separation of electron-hole pairs. When the molar ratio of Ag3PO4 to Bi2WO6 was 1:2, the degradation rate of toluene could reach 80% within 180 min. This study provided a new idea for the simple preparation of cheap and efficient nanocomposite materials for VOCs degradation by visible light.","PeriodicalId":11785,"journal":{"name":"Environmental Pollutants and Bioavailability","volume":"91 1","pages":"527 - 536"},"PeriodicalIF":3.3,"publicationDate":"2022-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80568139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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