Journal of Environmental Health Science and Engineering最新文献

{"title":"Polyaromatic hydrocarbons biodegradation using mix culture of microorganisms from sewage waste sludge: application of artificial neural network modelling","authors":"Yasmen A. Mustafa,&nbsp;Sinan J. Mohammed,&nbsp;Mohanad J. M. Ridha","doi":"10.1007/s40201-022-00787-1","DOIUrl":"10.1007/s40201-022-00787-1","url":null,"abstract":"<div><h3>Purpose</h3><p>In this study, we aimed to examine the tolerance of mixed culture of microorganisms isolated from sewage waste sludge to degrade high concentrations of polyaromatic hydrocarbons, naphthalene, and phenanthrene. The performance of the artificial neural network (ANN) model to predict and simulate the experimental biodegradation results was investigated.</p><h3>Methods</h3><p>The mixed culture of microorganisms was isolated from sewage waste sludge and adopted to biodegrade naphthalene and phenanthrene at different concentrations (100-1000mg/L). Sewage waste sludge obtained from wastewater treatment plants. A three-layer feed-forward network with a sigmoid transfer function (logsig) at the hidden layer, a linear transfer function (purelin) at the output layer, and a backpropagation training algorithm was used to set the ANN model.</p><h3>Results</h3><p>The results of this study show that naphthalene at concentrations of 100, 300, 700, and 1000 mg/L was depleted after incubation with the mixed culture for 6, 8, 14, and 16 days, respectively. For phenanthrene, depletion of 100, 300, 600, and 1000 mg/L was achieved after 8, 11, 16, and 19 days of incubation, respectively. A high correlation coefficient of 99.5% between the predicted and the experimental results were obtained by using the AAN model.</p><h3>Conclusion</h3><p>The results indicated that the mixed culture of microorganisms from sewage waste sludge could effectively consume naphthalene and phenanthrene as carbon and energy sources. Also, the ANN model could efficiently predict the experimental results for biodegradation treatment.</p></div>","PeriodicalId":628,"journal":{"name":"Journal of Environmental Health Science and Engineering","volume":"20 1","pages":"405 - 418"},"PeriodicalIF":3.4,"publicationDate":"2022-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40201-022-00787-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5400296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Identification and determination of the volatile organics of third-hand smoke from different cigarettes and clothing fabrics","authors":"Elahe Tondro Borujeni,&nbsp;Kamyar Yaghmaian,&nbsp;Kazem Naddafi,&nbsp;Mohammad Sadegh Hassanvand,&nbsp;Maziar Naderi","doi":"10.1007/s40201-021-00755-1","DOIUrl":"10.1007/s40201-021-00755-1","url":null,"abstract":"<div><p>Third-hand smoke (THS) is a persistent mixture generated from aged second-hand smoke (SHS) that accumulates in indoor environments and reemits into the air. This work evaluates the tobacco-derived volatile organics of cigarette THS from various clothing fabrics that were exposed to side-stream smoke of several brands of cigarettes in a controlled experimental scale. The qualitative and quantitative determination of the chemicals off-gassed was performed using solid phase micro-extraction coupled with GC/MS. Sixty-six components of side-stream smoke were identified in third-hand cigarette smoke. In this study, toluene-reference concentration (TRC) was calculated for volatile compounds and estimated based on the basic response characteristics of GC/MS. Among the identified analytes, 16 compounds were quantified presenting high toxicity and/or abundance in smoke, such as: benzene, toluene, xylene, pyridine, limonene, naphthalene, furfural and nicotine. The results showed that the total quantified volatile organics released for cotton, wool, polyester and filament fabrics were 92.37, 93.09, 87.88, and 50.22 μg/l fabric, respectively. Fabric structure significantly affects chemical off-gassing. Natural fibers were more capable of holding and emitting THS than synthetic fibers. Besides, various desorption times from 15 to 45 min after exposure to cigarette smoke in the study were evaluated. With increasing desorption time, no significant decrease in the concentration of organic compounds in THS was observed. Therefore, it is necessary to pay attention to the fact that it will be difficult to clean the pollutants from the environment contaminated with cigarette smoke and it will take more hours to reduce the concentration of organic compounds.</p></div>","PeriodicalId":628,"journal":{"name":"Journal of Environmental Health Science and Engineering","volume":"20 1","pages":"53 - 63"},"PeriodicalIF":3.4,"publicationDate":"2022-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40201-021-00755-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4859549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential of lytic bacteriophages as disinfectant to control of Pseudomonas aeruginosa on fomites","authors":"Golnar Rahimzadeh,&nbsp;Mohammad Ali Zazouli,&nbsp;Mohammad Sadegh Rezai","doi":"10.1007/s40201-021-00770-2","DOIUrl":"10.1007/s40201-021-00770-2","url":null,"abstract":"<div><h3>Purpose</h3><p>Nosocomial infections can be transmitted by contaminated hospital surfaces with resistant pathogens. <i>Pseudomonas aeruginosa (P. aeruginosa)</i> is an opportunistic pathogen that causes public healthcare issues. Conventional sanitation is not efficiently contributing to removing resistant pathogens. Bacteriophages suggest safe and specific decontamination. Bacteriophages are a promising alternative strategy to chemical biocides. This research aimed to evaluate the potential of phage in controlling <i>P. aeruginosa</i> in infected hard surfaces.</p><h3>Methods</h3><p>Bacteriophage was isolated from hospital wastewater. The efficiency lytic activity of phage against <i>P. aeruginosa</i> was assessed on various infected hard surfaces as plastic and ceramic. 50 µl of the phage lysate (2 × 10¹² PFU/mL) and 50 µl of 70% Ethanol solution separately were spread on the different infected surfaces. After 15 min, 1, 3, 6, and 24 h, surfaces were directly sampled by contact plates. The bacterial load was evaluated by enumerating plate CFU.</p><h3>Results</h3><p>Cystoviridae phages with titer (2 × 10¹² PFU/mL) efficiently can reduce <i>P. aeruginosa</i> on contaminated surfaces. The treated surfaces with 70% Ethanol solution and phage showed an evident drop in bacterial cell number.</p><h3>Conclusions</h3><p>Bacteriophages can be used as a new option for the development of biological products aimed at the control and deletion of pathogens on contaminated hard surfaces.</p></div>","PeriodicalId":628,"journal":{"name":"Journal of Environmental Health Science and Engineering","volume":"20 1","pages":"219 - 225"},"PeriodicalIF":3.4,"publicationDate":"2022-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40201-021-00770-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4298196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of pollutants in perfumes, colognes and health effects on the consumer: a systematic review","authors":"Zahra Kazemi,&nbsp;Ehsan Aboutaleb,&nbsp;Abbas Shahsavani,&nbsp;Majid Kermani,&nbsp;Zohre Kazemi","doi":"10.1007/s40201-021-00783-x","DOIUrl":"10.1007/s40201-021-00783-x","url":null,"abstract":"<div><p>Cosmetic products, especially perfumes and colognes, are widely used in various communities. However, the use of these products can have side effects on consumers. This article aims to review the relevant literature published up to August 2020 to determine whether perfumes and colognes can affect people’s health. Relevant articles were identified through electronic search. A total of 562 articles were selected and finally 37 related articles were included in the study after the screening process. The results of this systematic study showed that phthalates, aldehydes, parabens and aluminum-based salts are the most important contaminants in aromatic products that cause side effects such as allergies, breast cancer, reproductive disorders, especially in males, skin allergies, nervous system damage and migraine headaches for consumers. The incidence of complications in people using these products depends on parameters such as age, gender, race, amount of substance consumed, duration of use and economic status, and regarding the relationship between diseases such as cancer, respiratory disorders and endocrine with common contaminants in aromatic products, incidence of these diseases is probable in consumers which require further research to prove.</p></div>","PeriodicalId":628,"journal":{"name":"Journal of Environmental Health Science and Engineering","volume":"20 1","pages":"589 - 598"},"PeriodicalIF":3.4,"publicationDate":"2022-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40201-021-00783-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4117117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Risk assessment of uptake of trace elements through consumption of cereals: a pilot study in Yerevan, Armenia","authors":"Davit Pipoyan,&nbsp;Seda Stepanyan,&nbsp;Meline Beglaryan,&nbsp;Jean-Lou C. M. Dorne","doi":"10.1007/s40201-022-00792-4","DOIUrl":"10.1007/s40201-022-00792-4","url":null,"abstract":"<div><p>The study aimed to assess the dietary exposure and related human health risks associated with trace elements through the intake of staple cereals, including buckwheat, rice, and emmer. The contents of Lead (Pb), Cadmium (Cd), Mercury (Hg), Nickel (Ni), Molybdenum (Mo), Iron (Fe), and Copper (Cu) were determined using Atomic Absorption Spectrometry. Cereal consumption data were obtained through a Semi-Quantitative Food Frequency Questionnaire amongst the Yerevan adult population. Concentrations of Pb, Cd, Hg, Ni, Mo, Fe and Cu were 0.75-5.56 µg/kg, 1.21-6 µg/kg, 6.7-6.99 µg/kg, 50.6-111 µg/kg, 20-429 µg/kg, 2770-30500 µg/kg and 601-1720 µg/kg respectively. The estimated daily intakes (EDI) of all studied trace elements did not exceed the health-based guidance values. The margin of exposure (MOE) values of Pb, Cd, Hg, and Mo for all clusters were above the threshold (&gt;10 for Pb, Cd, and &gt;100 for Hg, Mo) and therefore did not indicate a health concern. Meanwhile, in the case of Ni exposure, the MOE values for the second and third clusters of buckwheat consumption and for the third cluster of emmer consumption were below the threshold (&lt;10) indicating that a human health risk cannot be excluded. Future work is proposed.</p></div>","PeriodicalId":628,"journal":{"name":"Journal of Environmental Health Science and Engineering","volume":"20 1","pages":"459 - 468"},"PeriodicalIF":3.4,"publicationDate":"2022-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40201-022-00792-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5175711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of alumina nanoparticles on the performance of polyacrylonitrile membranes in MBR","authors":"Targol Hashemi,&nbsp;Mohammad Reza Mehrnia,&nbsp;Saeid Ghezelgheshlaghi","doi":"10.1007/s40201-021-00784-w","DOIUrl":"10.1007/s40201-021-00784-w","url":null,"abstract":"<div><p>This study aims to investigate the effect of using Al₂O₃ nanoparticles (NPs) in membrane structure on the operation condition of the membrane bioreactor. To this end, alumina NPs as the high hydrophilic agents with an approximate size of 40 nm and a concentration of 0–3 wt.% were placed within the PAN polymeric membrane matrix structure with high hydrophilicity and high mechanical resistance over the others via the phase inversion method. Characterization of synthesized nanocomposite membranes was carried out by SEM analysis. In the presence of the alumina NPs, the porosity of the membranes improved. The water contact angle measurement confirmed the superior hydrophilicity of mixed PAN membranes compared to the pure polymeric membranes. The best nanocomposite membrane with better antifouling properties was selected to evaluate the MBR's performance in wastewater treatment and assessed in terms of the resistance, flux recovery, and COD removal rates. The result of a comparison with pure membrane showed that by increasing the Al₂O₃ amount up to 2wt.%, irreversible fouling resistance mitigated as much as 50%. Moreover, the flux recovery ratio was increased by 15%, and the COD removal rate was also raised as large as 16%. Our investigation illustrated that the presence of alumina NPs has improved the MBR performance and decreased the irreversible fouling resistance of the membrane.</p></div>","PeriodicalId":628,"journal":{"name":"Journal of Environmental Health Science and Engineering","volume":"20 1","pages":"375 - 384"},"PeriodicalIF":3.4,"publicationDate":"2022-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40201-021-00784-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5148302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Toxicity and Anti-feeding effect of Aesculushippocastanum, Thymus daenensis, Artemisia abrotanum, and Chrozophora tinctoria on Sitophillus oryzae","authors":"Reza Sadeghnezhad,&nbsp;Sepideh Abbaszadeh,&nbsp;Maryam Taghdir,&nbsp;Mojtaba Sepandi,&nbsp;Mahmoud Fazeli-Dinan,&nbsp;Mohammad Ali Zazouli","doi":"10.1007/s40201-021-00772-0","DOIUrl":"10.1007/s40201-021-00772-0","url":null,"abstract":"<div><h3>Background and aim</h3><p>The approach of food storage, especially cereals and basic human food sources, has long been considered as a problem to combat storage pests. the use of plant compounds has been suggested by researchers as an alternative to phosphine in the fight against pests.In this study, four plants such as <i>Aesculushippocastanum, Thymus daenensis, Artemisia abrotanum</i> and <i>Chrozophoratinctoria</i> were evaluated based on their deadly and repellent properties of pests and insectsconsidering Iranian medicine sources.</p><h3>Materials and methods</h3><p>First, plant extracts were prepared by ethanol solvent method and then, their lethal and Anti-feeding experiments were performed on rice insects (Sitophylusoryzae) in standard laboratory conditions.</p><h3>Results</h3><p>Extracts of <i>Thymus daenensis, Aesculushippocastanum, Artemisia abrotanum </i>and <i>Chrozophoratinctoria</i> were estimated to be 553.2, 753.6, 878.3 and 987.3 mg / ml effective dose, respectively.The results showed that Thymus daenensis extract with 90.33% with lower concentration compared to <i>Aesculushippocastanum, Artemisia abrotanum </i>and <i>Chrozophoratinctoria</i> extracts has the highest lethal effect against <i>S. oryzae</i>. Also in Anti-feedingtest, <i>Thymus daenensis </i>extract showed the highest Anti-feedingeffect in comparison with <i>Aesculushippocastanum, Artemisia abrotanum </i>and <i>Chrozophoratinctoria</i> extracts, respectively.</p><h3>Conclusions</h3><p>The use of plants in the control against storage pests such as rice weevils will have favorable environmental results, human health and less storage is dangerous.</p></div>","PeriodicalId":628,"journal":{"name":"Journal of Environmental Health Science and Engineering","volume":"20 1","pages":"241 - 249"},"PeriodicalIF":3.4,"publicationDate":"2022-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40201-021-00772-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5112411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The assessment of lead concentration in raw milk collected from some major dairy farms in Iran and evaluation of associated health risk","authors":"Shahnaz Sharifi,&nbsp;Sara Sohrabvandi,&nbsp;Vahid Mofid,&nbsp;Fardin Javanmardi,&nbsp;Elham Khanniri,&nbsp;Amir Mohammad Mortazavian","doi":"10.1007/s40201-021-00765-z","DOIUrl":"10.1007/s40201-021-00765-z","url":null,"abstract":"<div><p>Milk is one of the most consumed sources among people, especially children. hence, its contamination with heavy metals can pose a serious risk to children. Therefore, this study aimed to measure the lead concentration as one of the most dangerous heavy metals in the raw milk of several major animal husbandries in Tehran province from Iran. A total of 57 raw milk samples were collected from different regions of Tehran province. The lead contents were measured using a graphite furnace atomic absorption spectrometer. To evaluate the risk of the samples and hazard quotient (HQ) were calculated. The results showed that HQ for all samples was lower than 1 which was found within the acceptable level. Because the absorption of Pb is higher in children and this metal has a cumulative property in the body, even its small weekly intake can be dangerous in long-term consumption.</p></div>","PeriodicalId":628,"journal":{"name":"Journal of Environmental Health Science and Engineering","volume":"20 1","pages":"181 - 186"},"PeriodicalIF":3.4,"publicationDate":"2022-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40201-021-00765-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5113066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hybrid magnetic core–shell TiO2@CoFe3O4 composite towards visible light-driven photodegradation of Methylene blue dye and the heavy metal adsorption: isotherm and kinetic study","authors":"Mahmoud F. Mubarak,&nbsp;Hanaa Selim,&nbsp;Rania Elshypany","doi":"10.1007/s40201-021-00774-y","DOIUrl":"10.1007/s40201-021-00774-y","url":null,"abstract":"<div><p>Magnetic core–shell TiO₂@CoFe₃O₄ (TCM) composite photocatalytic particles with a core–shell structure were synthesized by the co-precipitation method as a novel catalyst for methylene blue (MB) dye degradation and adsorption efficiency of heavy-metal ion Pb(II) from aqueous solution. Various analytical techniques have verified the formation of the TCM core–shell through TEM, XRD, FT-IR, Raman, PL, and UV analysis. The presence of TiO₂ and cobalt magnetite in the TCM core shell is confirmed by XRD analysis. The formation of a homogenous CoFe₃O₄shell on TiO₂ spheres is confirmed by HR-TEM investigation. TiO₂ nanoparticle has a rutile structure with an average crystallite size of about 57.44 and a TCM core–shell of about 64.62 nm. From UV and PL studies, it was found that the core shell absorbs the visible range of the electromagnetic spectrum, which improves the effective separation between photo carriers. This study focused on several factors that influence metal ion adsorption, including initial concentrations, adsorbent dose, pH, and contact time. The TCM nanocomposite successfully separated the heavy metal ion Pb(II) from aqueous solutions, and the model predictions exactly matched the experimental results. For TCM material, the maximum adsorption efficiency for Pb(II) was 33.09 mg/g. The photocatalytic performance of TiO₂ and TCM is about 12% and 91% after 60 min for MB dye degradation. It was found that TiO₂@CoFe₃O₄ core–shell nanoparticles perform better as photo catalysts than pure TiO₂ and CoFe₃O₄due to their high efficiency and reusability. Furthermore, the analysis revealed that heavy metal adsorption from aqueous solutions could be reused over seven cycles with no adsorption capacity modification.</p></div>","PeriodicalId":628,"journal":{"name":"Journal of Environmental Health Science and Engineering","volume":"20 1","pages":"265 - 280"},"PeriodicalIF":3.4,"publicationDate":"2022-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40201-021-00774-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5470593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comprehensive study on the adsorption-photocatalytic processes using CoFe2O4/SiO2/MnO2 magnetic nanocomposite as a novel photo-catalyst for removal of Cr (VI) under simulated sunlight: Isotherm, kinetic and thermodynamic studies","authors":"Hadigheh Dorri,&nbsp;Ali Zeraatkar Moghaddam,&nbsp;Ebrahim Ghiamati,&nbsp;Behnam Barikbin","doi":"10.1007/s40201-021-00763-1","DOIUrl":"10.1007/s40201-021-00763-1","url":null,"abstract":"<div><h3>Purpose</h3><p>The present study aimed to investigate the efficiency of CoFe₂O₄/SiO₂/flower-like MnO₂ nanoparticles as a catalyst for Cr (VI) adsorption-photocatalytic processes.</p><h3>Methods</h3><p>The magnetic nanocomposite used was first synthesized and then characterized using TEM, SEM, EDX, XRD, FTIR, XRF and BET advanced techniques. The removal of the Cr (VI) was performed through a batch adsorption approach and the effects of sample pH (A; 2–6), initial chromate concentration (B; 50–100 ppm) and adsorbent weight to sample volume ratio (C; 1–3 mg ml⁻¹), hole scavenger (0.1 -0.3%w/v) and time (E; 30–60 min), to evaluate the individual and interactive effects under ultraviolet light conditions, were also studied by the central composite design in the photocatalytic process of adsorption.</p><h3>Results</h3><p>The adsorption-photocatalytic performance of the CoFe₂O₄/SiO₂/MnO₂ composite was high in which 98.1% of Cr(VI) after 30 min of photocatalytic treatment in optimum conditions (i.e. pH = 3, catalyst concentration = 2 mg L⁻¹, Cr(VI) concentration = 200 mg L⁻¹, and hole scavenger concentration = 0.4% (w/ v), At laboratory temperature, speed = 400 rpm, under UV radiation).Under optimum conditions, Cr(VI) reductive followed pseudo—second—order kinetics and followed the Langmuir and Temkin isotherms, also, positive value of ΔH° indicates endothermic nature.</p><h3>Conclusions</h3><p>The results showed that the synthesized CoFe₂O₄/SiO₂/MnO₂ magnetic nanocomposite holds a great potential for use as a photocatalyst to remove Cr (VI) in adsorption reactions. It can be used as an effective catalyst in the eradication of Cr (VI) wastewater.</p><h3>Graphical abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":628,"journal":{"name":"Journal of Environmental Health Science and Engineering","volume":"20 1","pages":"147 - 165"},"PeriodicalIF":3.4,"publicationDate":"2022-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40201-021-00763-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4966375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}