International Journal of Environmental Research最新文献

{"title":"Bentonite/Sesbania Gum Hydrogel for Effective Removal of Cationic Dyes: Network Structure Construction and the Role of Multiple Hydroxyl and Carboxyl Adsorption Sites","authors":"Luying Jiang, Sishan Yu, Jingwei Zhang, Zisong Xu, Rui Tang, Yinlong Wang, Ke Liang, Chen Zhai, Zhangfa Tong, Hanbing Zhang","doi":"10.1007/s41742-024-00624-3","DOIUrl":"https://doi.org/10.1007/s41742-024-00624-3","url":null,"abstract":"<p>Effective hydrogel adsorbents are widely used in toxic dyes removal, but weak toughness and inferior adsorption performance limit their actual application. Herein, a dual-functionalized epoxy and amino groups hyperbranched polysiloxane (HPSi) cross-linker was initially developed, bentonite (BT) was incorporated with sesbania gum (SG), acrylic acid/acrylamide (AA/AAm) was utilized as monomers to synthesize hydrogel adsorbent H-SG/BT(AA/AAm) for the adsorption of methylene blue (MB) and malachite green (MG). Various characterization techniques, adsorption parameters test and mechanism analysis demonstrated that HPSi and BT endowed H-SG/BT(AA/AAm) with enhanced mechanical strength (tentative extensibility of 2645% and elastic recovery was over 90%). The hydroxyl of BT and SG was completely insert into the hydrogel then significantly enhanced the swelling and adsorption capacity. H-SG/BT(AA/AAm) exposed a promising adsorption capacity towards MB and MG with maximum adsorption capacity of 1226 mg/g and 783 mg/g. Kinetic and isotherm studies indicated that the adsorption of MB and MG onto H-SG/BT (AA/AAm) closely followed the pseudo-second-order kinetic model and Langmuir isotherm. The adsorption efficiency of H-SG/BT (AA/AAm) for MB and MG could still reach 80% after five adsorption–desorption cycles. Clearly, H-SG/BT(AA/AAm) composites can be effectively utilized as an eco-friendly adsorbent for dyes adsorption in aqueous environments.</p>","PeriodicalId":14121,"journal":{"name":"International Journal of Environmental Research","volume":"97 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141502722","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}

{"title":"Bioprospecting and Repurposing of Leaf Biomass to Support Sustainable Biopharmacy: Evaluation of Seasonal Chemical Variations and Biological Activities of Six Eucalyptus Essential Oils","authors":"Izabel Pietczak Migacz, Mei Wang, Janaine Alberto Marangoni Faoro, Sidney Mariano dos Santos, Anelise Samara Nazari Formagio, Candida Aparecida Leite Kassuya, Junaid Ur Rehman, Wilmer Hervet Perera, Vitória Caroline Gonçalves, Douglas Siqueira de Almeida Chaves, Vijayasankar Raman, Paulo Vitor Farago, Ikhlas Ahmed Khan, Jane Manfron","doi":"10.1007/s41742-024-00628-z","DOIUrl":"https://doi.org/10.1007/s41742-024-00628-z","url":null,"abstract":"<p>This study focuses on six <i>Eucalyptus</i> species, namely <i>E. badjensis</i>, <i>E. benthamii</i>, <i>E. dunnii</i>, <i>E. grandis</i>, <i>E. globulus</i>, and <i>E. saligna</i> aiming at a sustainable use of their green biomass. These species were grown at the same location and stage of development. Leaf essential oils were extracted by hydrodistillation using a Clevenger apparatus during the four seasons. Gas chromatography–mass spectrometry (GC–MS) and high-performance thin-layer chromatography (HPTLC) techniques were used to analyze the chemical composition. <i>E. badjensis</i> consistently exhibited a dominant composition, with 1,8-cineole being the predominant component. Notably, the proportion of 1,8-cineole in <i>E. badjensis</i> was 77.35% in spring (SP), 69.46% in summer (SU), 95.30% in autumn (AU), and 89.30% in winter (WI). <i>E. globulus</i> also exhibited 1,8-cineole as its primary constituent, with proportions fluctuating slightly across seasons at 84.87%, 79.94%, 81%, and 85.88%, respectively. The proportions and constituents of various species differed significantly. HPTLC was successfully used as a swift technique to monitor the chemical composition of essential oils (EOs) in various <i>Eucalyptus</i> species during the seasonality. GC–MS and HPTLC analysis showed that different <i>Eucalyptus</i> species displayed unique chemical compositions, while both the chemical profile and productivity of all analyzed EOs were affected by seasonality. This finding was demonstrated in the principal components cluster. The analysis of six species has revealed that the EO of <i>E. benthamii</i> is the most potent in thwarting the infestation of <i>Cimex lectularius</i>. Additionally, all six EOs demonstrated antioxidant activity in the ABTS model. EOs of <i>E. benthamii</i>, <i>E. dunnii</i>, and <i>E. grandis</i> showed significant anti-inflammatory activities in experimental models.</p>","PeriodicalId":14121,"journal":{"name":"International Journal of Environmental Research","volume":"24 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141502715","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}

{"title":"An IoT Based Water Quality Classification Framework for Aqua-Ponds Through Water and Environmental Variables Using CGTFN Model","authors":"Peda Gopi Arepalli, K. Jairam Naik, Jagan Amgoth","doi":"10.1007/s41742-024-00625-2","DOIUrl":"https://doi.org/10.1007/s41742-024-00625-2","url":null,"abstract":"<p>Maintaining water quality in aquatic habitats is critical for the health of aquatic species, particularly fish. This study pioneers an innovative method to water quality classification, leveraging IoT-driven data acquisition and meticulous data labelling with the Aqua-Enviro Index (AEI) by considering the fish habitats. Existing mechanisms fail to capture complex temporal dynamics and depend largely on large amounts of labelled data, exposing fundamental limits. In response, we describe the Deep learning based Convolutional Gated Recurrent Unit Tempo Fusion Network (CGTFN) model, which represents a considerable development in the evaluation of water quality. The model addresses these restrictions by seamlessly merging Convolutional Neural Networks (CNNs) for spatial pattern recognition and Gated Recurrent Units (GRUs) for temporal interactions. The Tempo Fusion mechanism combines spatial, temporal, and contextual data harmoniously, allowing for more sophisticated classifications by recognizing subtle interdependencies among environmental elements. The pioneering CGTFN model outperforms previous models, achieving 99.71 and 99.81% accuracy on both public-env and real-time-env datasets, respectively, exceeding established models at 98.2%. These remarkable findings highlight CGTFN’s disruptive potential in water quality evaluation, bridging the gap between technology and environmental management, with ramifications ranging from aquaculture to resource sustainability.</p>","PeriodicalId":14121,"journal":{"name":"International Journal of Environmental Research","volume":"86 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141502693","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}

{"title":"Uncovering the Origins of Environmental Vulnerabilities: A Study of Three South Asian Nations","authors":"Mansoor Ahmed Golo, Dongping Han, Daniel Balsalobre Lorente, Asif Raihan, Meltem Altin","doi":"10.1007/s41742-024-00626-1","DOIUrl":"https://doi.org/10.1007/s41742-024-00626-1","url":null,"abstract":"<p>The present study aims to ascertain the causes of environmental vulnerabilities in Pakistan, Bangladesh, and India. The countries are ranked top ten in the Global Climate Risk Index list in 1998–2017, 1999–2018, 2000–2019, 2018, and 2019. Hence, we determine whether the observing nations’ increasing GDP per capita, energy use, and population density intensify greenhouse gas emissions. This study also considers structural breaks in the time-series data from 1990 to 2019. Using the bounds-testing approach, we discover evidence of long-run cointegration among the variables. Furthermore, the long-run autoregressive distributed lag (ARDL) estimations disclose that GDP per capita positively correlates with greenhouse gas emissions, with this effect observed across all sample countries except India in the short run. Additionally, in the long and short run, energy use intensifies greenhouse gas emissions in all sample countries except Bangladesh. Population density also harms the environment in both time horizons in all the observed countries. The study also incorporates fully modified OLS (FMOLS) and dynamic OLS (DOLS) regressions for robust interpretations. Findings of FMOLS and DOLS also support the ARDL model’s outcomes. Moreover, diagnostic tests confirm the stability and reliability of ARDL models. Based on the varying findings on the impacts of energy use on greenhouse gas emissions across countries in the short and long run and the influence of GDP per capita in the short run, policymakers should tailor environmental policies according to nations’ energy and income structures.</p><h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>\u0000","PeriodicalId":14121,"journal":{"name":"International Journal of Environmental Research","volume":"15 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141517120","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}

{"title":"Synthesis, Characterization, Photocatalytic and Antimicrobial Potential of Pr2O3/ZnO/gC3N4 Nanocomposite","authors":"Kiran Sabir Ali, Kausar Hussain Shah, Hafiz Muhammad Asif, Muhammad Ali Khan, Shabbir Hussain, Muhammad Tariq","doi":"10.1007/s41742-024-00617-2","DOIUrl":"https://doi.org/10.1007/s41742-024-00617-2","url":null,"abstract":"<p>In the current work, an efficient co-precipitation technique was used to develop a new Pr₂O₃/ZnO/g-C₃N₄ ternary nanocomposite. Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX) were used for vibrational, structural, morphological, and compositional analysis, respectively. The FTIR spectrum confirmed the presence of characteristics vibrational bands associated with the Pr–O, Zn–O, at 603 cm⁻¹ and 546 cm⁻¹, respectively. The XRD pattern revealed the presence of diffraction peaks related to ZnO (hexagonal), Pr₂O₃ (hexagonal) and gC₃N₄ (tetragonal) in the nanocomposite. SEM images revealed that the nanocomposite has porous type morphology with high agglomeration. The photocatalytic activity of nanocomposite was assessed against organic dye pollutant Methylene blue (MB) and antibiotic Ciprofloxacin (CIP) under the sunlight irradiation. <i>The maximum degradation efficiency of nanocomposite for MB 93% at pH</i> = <i>11 and CIP 97% at pH</i> = <i>6.</i> The scavenger's experiment was carried out, and the findings demonstrate that the photocatalytic activity of MB and CIP is strongly dependent on the (•OH) and (O₂•-) species. The antimicrobial activity was also analyzed against bacterial strains such as Grampositive<i>Bacillus subtilis, Staphylococcus aureus</i>, <i>and</i> Gram negative <i>Klebsiella pneumoniae, Escherichia coli</i>species<i>. The results showed higher inhibition zones against Escherichia coli.</i></p>","PeriodicalId":14121,"journal":{"name":"International Journal of Environmental Research","volume":"20 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141254581","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}

{"title":"Odor Diffusion Control by Nanoparticles Filled Long-Chain Branched Polylactic Acid Film: Mechanism and Application Potential Research","authors":"Meiyun Feng, Zhiqiang Xu, Kuangfei Lin, Meng Zhang","doi":"10.1007/s41742-024-00622-5","DOIUrl":"https://doi.org/10.1007/s41742-024-00622-5","url":null,"abstract":"<p>The biodegradable film that exhibited excellent physical barrier properties and the function to degrade smelly organic pollutants (SOP) had been successfully synthesized in this study. The organic intercalation-modified bentonite that loaded with CaO₂ (OBT@CaO₂) was synthesized initially, which would serve as a layered nano-filler to modify the long-chain (polybutylene adipate-co-terephthalate) branched polylactic acid (PLA/PBAT), to produce the SOP diffusion control film (OBT@CaO₂-PLA/PBAT, OCPP). OBT@CaO₂ could improve the initial tensile strength (46.5 ± 6.53 MPa) and elongation at break (412.8 ± 9.25%) of OCPP film, and the O₂ transmission rate was as low as 44.89 cc/m²∙day. Although the saturated adsorption capacity of SOP on OBT@CaO₂ decreased with olfactory thresholds, the penetration time correspondingly increased due to reduced degradation difficulty. OCPP film showed excellent SOP control performance in laboratory and large-scale tests at actual pesticide industrial contaminated sites (PICSs). The diffusion fluxes of SOP exhibited a reduction of at least 84.0% within 14 days, and the effectiveness of SOP control increased over time. This improvement is attributed to the gradual release of H₂O₂ by OBT@CaO₂, enabling the effective degradation of SOP that adsorbed on it, thereby continuously providing adsorption sites. The research can provide a low-cost and green approach for long-term diffusion control of SOP at contaminated sites that are not limited to PICSs.</p><h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>\u0000","PeriodicalId":14121,"journal":{"name":"International Journal of Environmental Research","volume":"31 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141254494","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}

{"title":"Detection of Atmospheric Microplastics Accumulated in Xanthoria parietina: A Lichen Biomonitoring Study on the Asian Side of Istanbul","authors":"Gülşah Çobanoğlu, Ezgi Özen","doi":"10.1007/s41742-024-00596-4","DOIUrl":"https://doi.org/10.1007/s41742-024-00596-4","url":null,"abstract":"<p>Airborne microplastics have become invisible global threats to all living organisms today. This study was designed for the first time to monitor atmospheric microplastic pollution in the city of Istanbul (Turkiye) through lichens, known as air pollution biomonitors. Epiphytic foliose lichen <i>Xanthoria parietina</i> was sampled from forested areas in 8 different districts on the Asian side of megacity, and searched for clues of microplastics through chemical characterization and microscopic examination. Twelve compounds (aldehyde, alkene, amine, carboxylic acid, ether, hydrocarbon, hydroxide, ketone, methyl, methylene, nitrogen dioxide, and sulfur dioxide) were identified as microplastic components in urban lichen samples taken from all localities with the FT-IR technique used in polymer identification. The most accumulated compound in lichen samples was amine, which is formed as a result of the chemical degradation of plastics. Building blocks of microplastic particles (MPs) such as aldehydes, carboxylic acid and methylene, as well as air pollutants such as SO₂ and NO₂ were also detected. Analysis data were supported by microscopic observations made by applying fluorescent staining method to lichen thalli and MPs were also detected visually. The highest number of MPs seen in the lichen thalli was detected in samples taken from touristic areas in Üsküdar district. Based on the results, in addition to human impact, intense atmospheric microplastic compounds identified by lichen monitoring on the Asian side of Istanbul suggest that these pollutants may have been transported from local plastic waste or industrial areas. This study shows that biomonitoring studies of airborne organic pollutants such as microplastics can be done through lichens.</p><h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3>","PeriodicalId":14121,"journal":{"name":"International Journal of Environmental Research","volume":"35 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141254778","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}

{"title":"Synthesis and Application of Oxalate–Phosphate–Amine Metal–Organic Framework Fertilizers in Calcareous Soils: Analysis of Nitrogen, Phosphorus, and Grain Yield in Triticum aestivum L.","authors":"Lida Vasel, Ahmad Farrokhian Firouzi, Ataallah Khademalrasoul","doi":"10.1007/s41742-024-00607-4","DOIUrl":"https://doi.org/10.1007/s41742-024-00607-4","url":null,"abstract":"<p>The efficacy of oxalate–phosphate–amine metal–organic frameworks (OPA-MOFs) as highly efficient slow-release fertilizers in acidic soils is well established. However, a research gap exists concerning the impact of OPA-MOFs on soils with high levels of calcium carbonate. Thus, two distinct types of OPA-MOFs with enhanced specific surface areas were synthesized and utilized in field experiments. A randomized complete block design was employed to evaluate the effect of five different fertilizers on nitrogen (N) and phosphorus (P) contents in wheat at various growth stages cultivated in calcareous soil. The treatments comprised OPA-MOF1, OPA-MOF2, IF1 (urea and triple superphosphate fertilizer), IF2 (ammonium nitrate and triple superphosphate fertilizer), and a control, each with three replications. N and P contents of the wheat plants were assessed at Zadoks growth stages 13 and 40, as well as in the wheat grains. The findings indicated that the highest grain yield was obtained with IF1 (1439.86 kg ha⁻¹), followed by IF2 (1146.83 kg ha⁻¹). In contrast, the OPA-MOF treatments yielded lower grain yields (OPA-MOF1: 1020.64 kg ha⁻¹, OPA-MOF2: 845.06 kg ha⁻¹). Moreover, OPA-MOF1 exhibited a more pronounced effect on the slow release of N and P elements due to its more regular structure, resulting in higher N content during the middle growth stage and a greater grain yield compared to OPA-MOF2.</p>","PeriodicalId":14121,"journal":{"name":"International Journal of Environmental Research","volume":"7 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141254579","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}

{"title":"ZnO Nanoparticles and Soil Fauna Affect Nutrient Transfer via Effects on Soil Fungal Community During Returned Wheat Straw Decomposition","authors":"Yanyan Jia, Dalu Gu, Xiaofeng Du, Wenfei Yang, Xiaodong Yin, Qisheng Li, Xiangshi Kong, Yuehong Gao, Qin Kong, Tingwu Liu","doi":"10.1007/s41742-024-00610-9","DOIUrl":"https://doi.org/10.1007/s41742-024-00610-9","url":null,"abstract":"<p>The decomposition of returned straw is increasing facing the negative impacts by metal nanoparticles (NPs), however, which may be modulated by soil fauna and this modulation effect is unclear. Here, the interactive effects of ZnO NPs with soil fauna on wheat straw decomposition were investigated in a potted rice cropping system. The results showed that ZnO NP below middle concentrations did not significantly influence straw decomposition, and mass loss was mainly driven by microfauna and microbes. High concentrations of ZnO NPs significantly impeded decomposition, mainly by reducing the complexity of fungal communities. This negative effect was ascribed to the promotion of Zn solubilization by bacterial taxa such as unclassified Acidobacteria, Bacteroidetes and Gemmatimonadetes. ZnO NPs had a greater impact on soil microorganisms than on fauna, reduced microbial activity, promoted the released straw nutrients entering into the soil by damaging nutrient transferring microorganisms and dominated the effects on soil stoichiometry. However, soil fauna significantly increased the activities of C- and N-releasing enzymes, decreased the activity of P-releasing enzymes, regardless of ZnO NP concentration, and promoted straw C decomposition. ZnO NPs altered soil microbial community composition, but these changes were modulated by soil fauna. Nonetheless, nutrient transport by fungi such as Ascomycota and Zygomycota and grazing by fauna were the predominant modulators on straw stoichiometry. The results of this study revealed that rational control of soil fauna will be helpful for promoting straw decomposition and efficient recycling of straw nutrients by crops under ZnO NP contamination.</p>","PeriodicalId":14121,"journal":{"name":"International Journal of Environmental Research","volume":"134 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141172265","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}

{"title":"Enhanced Bioremediation of Commercial Diesel Contamination by Mixed Culture of Newly Isolated Providencia vermicola IITG20 and Pseudomonas aeruginosa IITG21 from Local Refinery Waste","authors":"Rahul Kumar, Mahuya De","doi":"10.1007/s41742-024-00613-6","DOIUrl":"https://doi.org/10.1007/s41742-024-00613-6","url":null,"abstract":"<p>Two bacteria <i>Providencia vermicola</i> IITG20 and <i>Pseudomonas aeruginosa</i> IITG21 were isolated from the local refinery waste sludge and contaminated soil. They were found to be able to utilise different hydrocarbons such as diesel, petrol, kerosene and engine oil for their growth. The effect of process parameters was studied and most suitable conditions for degradation by the selected strains and their mixed culture were found to be 4% v/v initial diesel concentration, 37 °C temperature, pH 7, and 1% v/v initial inoculum concentration. The highest growth was observed for mixed culture. The lowest growth was observed for the pure culture of <i>Pseudomonas aeruginosa</i> IITG21. The degradation of 4% v/v diesel at 37 °C in 15 days was found to be 70 and 76% by the pure culture of <i>Pseudomonas aeruginosa</i> IITG21 and <i>Providencia vermicola</i> IITG20, respectively. Their mixed culture gave 85% degradation. The rate of degradation for diesel was highest for mixed culture compared to pure cultures. The rate constant for first order degradation was 0.154 day⁻¹ for mixed culture. It was higher compared to that of the pure culture of <i>Providencia vermicola</i> IITG20 (0.098 day⁻¹) and <i>Pseudomonas aeruginosa</i> IITG21 (0.83 day⁻¹). Accordingly, the half-life for mixed culture was lower (4.5 days) than that for pure cultures of both bacteria (7.1 and 8.3 days). These findings highlight the potential of mixed bacterial culture of <i>Providencia vermicola</i> IITG20 and <i>Pseudomonas aeruginosa</i> IITG21 for more efficient hydrocarbon degradation in petroleum hydrocarbon contaminated environments, offering promising implications for bioremediation strategies.</p>","PeriodicalId":14121,"journal":{"name":"International Journal of Environmental Research","volume":"13 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141171907","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}