Environmental Nanotechnology, Monitoring and Management最新文献

All synthesized AgNPs were characterized by the spherical shape nature; therefore, the cited work aims to present a perspective methodology for obtaining AgNPs of cluster beans for the first time (Alg-AgNPs). This synthesis was performed by stepwise addition of a powder mixture involving vitamin C (0.6 g) as reducing agent and alginate (0.4 g) as sustainable surfactant to solution involving (1 g) of AgNO₃ dissolved in conductivity water at pH of 1–2 whilst stirring the mixture continuously and vigorously for about 10–20 min. The naked eye observations noticed a rapid change in color of Ag (I) solution from colorless into brownish when just gets in touch with the added mixture, then turns rapidly into greyish of colloidal sol aggregates. Such formed aggregates were turned into black crystals by aging or gentle warming. In absence of vitamin C, addition the alginate powder to Ag (I) electrolyte leads to formation of granule grains precipitate. The SEM, TEM and XRD investigations indicated the formation of alginate-based capped AgNPs of clusters beans with particle size of 26.5 nm in the former case and alginate-based Ag(I) granule complex of amorphous phase in the latter ones, respectively. The synthesized Alg-AgNPs were found to have high antimicrobial activity against gram-positive and gram- negative bacteria. Some kinetic studies were performed to follow the growth rates of nanoparticles for shedding some light on the nature of electron-transfer pathway in the rate-determining step. The formed granule complex was applied as starting sample material for determining the alginate capacity as adsorbent biomaterial for binding Ag (I) ion from aqueous solutions. A capacity value of 80.85 mg/g was obtained at 25 °C. The correlation between the alginate capacity and properties of coordinated metal ions involving Ag(I) was examined. The experimental results were interpreted and a tentative formation mechanism of Ag NPs was suggested.

Heavy metals (HMs) are a threat to ecology and human health. HMs, present even in a trace amount, are often carcinogenic creating an alarming threat to civilization. Consequently, selective and sensitive detection of HMs is a crying need. Copper, being a group 11 3d transition metal, is inexpensive with a strong surface plasmon band in the nano regime and intriguing fluorescence in the cluster regime. Copper particles, though cost-effective, are usually vulnerable to aerial oxidation. By different capping agents/stabilizing agents, copper particles are stabilized. With this idea in mind, we reviewed the sensing of HMs using copper nanoparticles (PNCus) and copper nanoclusters (CCus). Fluorometric and colorimetric detection techniques are illustrated in detail here. Fluorometric sensing was quenching-based and no enhancement-based sensing is available, to the best of our knowledge. CCus are usually employed for fluorometric detection while PNCus are mostly used to detect calorimetrically. In addition to it, we included mechanistic ground of sensing, the fate of sensing platform & analytes, spot analyses, and natural sample analyses along with basic knowledge of nanoparticles & nanoclusters and toxicity of heavy metals.

Most conventional pesticide formulations get lost in the field during spraying, which causes a variety of issues with the environment and public health. Therefore, the study aimed to use new nanotechnology, such as nanoemulsion of propolis (NP) alone or mixed with some activator adjuvants, tannin (T), argal (Si), and urea (U) for improving the performance of chlorfenapyr on eggplant leaves. The results of the study indicate that the addition of chlorfenapyr to NP alone or in combination with the tested activator adjuvants reduced the surface tension of chlorfenapyr, improved the total initial amounts of droplet deposition efficiency, gradually enhanced the translocation process from soil to the eggplant leaves and between the leaves, and increased the efficiency of chlorfenapyr at the lowest dose while reducing environmental contamination. After two hours of treatment, the droplet deposition efficiency of chlorfenapyr on the eggplant leaves was found to be improved by NP alone at a concentration of 0.25 % to 1.58 mg kg⁻¹, as compared to 1.05 mg kg⁻¹ in the control. However, when NP was combined with activator adjuvants, NP-Si-U, the droplet deposition efficiency was increased to 1.90 mg kg⁻¹. Furthermore, chlorfenapyr enhanced with NP-Si-U induced the highest control efficiency against Tetranychus urticae. It is evident that treating chlorfenapyr amended with NP-T-U and NP-Si-U on the middle eggplant leaves, separately induced considerable translocation the pesticides to other part of the eggplant leaves within the range of 0.12 mg kg⁻¹ – 0.23 mg kg⁻¹, and 0.13 mg/kg⁻¹ − 0.27 mg/kg⁻¹, respectively through 1–3 days, while it did not transfer in the chlorfenapyr alone. Moreover, the transfer of chlorfenapyr from the soil to eggplant leaves increased, with values ranging between 0.63–0.79 mg/kg⁻¹ and 0.65–0.96 mg/kg⁻¹, respectively, during 2–4 days of exposure compared to 0.22–0.31 mg/kg⁻¹ in chlorfenapyr. The addition of NP to chlorfenapyr improved the plants vigor index for tomato, squash, and sweet melon to 1.23, 1.18, and 1.11 times at the recommended dose, and to 1.40, 1.50, and 1.32 times at half the recommended dose, respectively compared with the control. These results suggest that the addition of NP with activator adjuvants to pesticides leads to improvements in control efficiency and efficacy of utilization.

This study aims to study the adsorption and oxidation of Paracetamol (PAR) and Atenolol (ATL) for application in water treatment. The pharmaceutical concentrations were monitored over time to assess the efficiency of the simultaneous process. The pH, contact time, and activated carbon (GAC) concentration were the variables evaluated in the adsorption process. While to the Fenton reaction, the proportion of Fe²⁺/H₂O₂ was the variable studied. Outcomes show that the most suitable conditions in the adsorption process to treat 40 mg/L of each pharmaceutical were achieved at 3 g of activated carbon (GAC) and 60 min. To the Fenton reaction, a ratio of 0.5 Fe²⁺/H₂O₂ was the most suitable condition. The results obtained in the simultaneous process were 17 % of mineralization, and 100 and 73.3 % of degradation of ATL and PAR. respectively. The formation of degradation products also decreased after treatment, suggesting the potential environmental safety of the combined treatment. A regeneration study was conducted to recuperate the GAC. The results showed that a GAC regeneration of 98 % was achieved after 4 cycles by the Fenton process, maintaining the degradation of pollutants evaluated at ∼ 99–98 %. Finally, a toxicity Quantitative Structure-Activity Relationship (QSAR) study was carried out to predict its potential toxicity, showing that it is feasible to conclude that the method has positive implications for environmental safety.

The non-biodegradability of heavy metals makes them a serious environmental hazard. Heavy metal pollution in soil is caused by both natural and human activities. Such pollution impairs agricultural productivity and food security, interferes with microbial activity, and affects soil fertility. Research shows that Noccaea caerulescens has the capacity to accumulate up to 30,000 ppm, indicating the potential use of hyperaccumulators in metal remediation. Conventional methods of treating soils contaminated with heavy metals are frequently costly, time-consuming, and detrimental to the environment. Utilizing particular plant species to absorb and stabilize pollutants, phytoremediation is emerging as a successful and sustainable method. The numerous phytoremediation techniques and their uses in treating heavy metal-contaminated soils are thoroughly examined in this review, with an emphasis on the benefits, drawbacks, and potential for widespread application of each technique. Additionally, a comparative examination of several phytoremediation methods, including phytodegradation, rhizodegradation, phytostabilization, phytovolatilization, phytofiltration, and phytoextraction, showed a number of benefits in terms of affordability, user-friendliness, and environmental compatibility. This comprehensive review describes the variables that affect phytoremediation, such as plant physiology, metal speciation, soil pH, and climate. The field of nano-phytoremediation has explored opportunities to improve phytoremediation’s molecular efficiency. In numerous studies, the effectiveness of methods like phytostabilization, rhizodegradation, and phytovolatilization in lowering heavy metal concentrations has been demonstrated to reach up to 80 %. In order to increase phytoremediation’s effectiveness in addressing environmental pollution, this review emphasizes the significance of incorporating novel techniques and taking a variety of environmental factors into account.

The current study demonstrates the facile synthesis of nickel oxide nanoparticles (NiONPs) by using Tinosphora cordifolia as bioreductor. Structural, morphological, optical, photocatalytic activity and stability of the prepared NiONPs were investigated. From the structural and morphological studies using XRD, XPS, SEM and TEM, it was found that single phase of NiO produced with particle size of 19.5 nm. The material exhibited the band energy of 3.14 eV which support its photocatalytic activity in tetracycline removal by photocatalytic oxidation mechanism. The removal efficiency of 99.4 % was achieved by 30 min of photocatalytic oxidation treatment. Liquid chromatography-high resolution mass spectrometry analysis applied to identify the tetracycline degradation products represents the mechanism of hydroxyl attack to carbonyl, and demethylation that leads to aromatic ring opening and the formation of smaller compounds. The studies on the effect of scavenger implied that •OH and hole are participative component in the mechanism. The reusability study demonstrated that the NiONPs photocatalyst retained its stability after being used for five times without significant change of removal efficiency. Further study on chemical stability of the material suggest that structural change of NiO into α-Ni(OH)₂ occurred after 5th cycle usage.

The unintended release of nanoparticles into the environment, known as nanopollution, poses a severe hazard to plant communities. Addressing this issue demands a thorough understanding of the physiological, biochemical, and molecular mechanisms used by plants to deal with nanopollutants. This review summarises the state of the art regarding nanopollution, including its kinds, causes, and effects on the environment, with a particular emphasis on how it affects plant systems. As major producers, plants are essential to the ecosystem and are especially vulnerable to nanopollution. Plant physiology is affected by nanopollution in a way that includes changes to growth, photosynthesis, nutrient uptake, and general health of the plant. The review highlights that metal nanoparticles adversely affect the plant growth by negatively affecting the cell division, photosynthesis by affecting photosynthesis apparatus and plant health by virtue of toxicity Understanding the molecular underpinnings of nanopollution is opening our eyes to the ways in which plant biological components and nanoparticles interact. Current review comprehensively explains the role of plant secondary metabolites, phytohormones and genetic elements as weapons against nanopollution. The complexity of interactions between nanoparticles, methodological constraints, and the absence of established techniques for measuring nanopollution are obstacles in the research of impact caused by nanopollution on plants. This review integrates current knowledge on nanopollution, highlighting the multifaceted responses of plants at physiological, biochemical, and molecular levels. By clarifying these processes, new avenues for reducing nanopollution and protecting plant health can be created, which will eventually maintain ecological equilibrium.

In the last decades, there has been a growing concern regarding the remediation and recovery of polychlorinated biphenyls (PCBs) contaminated sites. The technologies traditionally used are often energy-intensive, resource-heavy, and highly disruptive to the environments being treated. In this context, mycoremediation has emerged as a highly sought-after alternative due to the efficiency of certain fungal strains in achieving high removal percentages. This review provides an overview of mycoremediation strategies for PCB bioremediation. We begin by outlining the ecotoxicological challenges posed by PCB usage and traditional methods employed for remediating contaminated areas. Secondly, we present different approaches to mycoremediation of PCBs. The use of native PCB-degrading fungi shows that some strains belonging to the Penicillium, Fusarium, and Scedosporium genera are capable of removing over 70 % of different PCBs congeners. Alternatively, we discuss using white rot fungi (WRF) due to their potential in transforming PCBs and associated metabolites. Strains belonging to this group, such as Pleurotus pulmonarius, can attain PCBs removal rates above 90 % with a 10.27 % reduction in toxicity. Additionally, cases demonstrating the application of WRF in long-term polluted soil and water are presented as field examples. A trickle bed pilot-scale bioreactor approach using Pleurotus ostreatus obtained an average PCBs removal of 89 ± 9 % for contaminated groundwater. Similarly, microcosm experiments using P. ostreatus and Irpex lacteus removed up to 50.5 % and 41.3 % of PCBs content in long-term contaminated soils, respectively. We also highlight the role of extracellular ligninolytic enzymes, such as lacasses, lignin peroxidases, manganese peroxidase, manganese-independent peroxidase, and internal oxidoreductases in the PCBs metabolism carried out by WRF. Finally, we conclude with a series of factors to consider when implementing these techniques for remediating polluted sites, including up-scaling, current regulations, and combination with other remediation techniques.

Treating complex and variable wastewater, mainly from refineries with diverse pollutants, presents multifaceted challenges. However, through diligent management and the implementation of efficient treatment strategies, the effectiveness of wastewater treatment can be maintained, ensuring the protection of the environment and public health. This study aims to enhance the coagulation-flocculation process for pretreated wastewater from vegetable oil refineries (VORW). Findings reveal that pretreatment through gravity separation influences coagulation-flocculation efficiency for oil-containing wastewater. Employing a central composite design (CCD), the study examines the effects of pH, coagulant/flocculant dosage, and settling time on turbidity and chemical oxygen demand removal (COD). Each factor significantly impacts results, with pH exerting the most substantial influence. ANOVA results validate the statistical significance of the selected models, aligning with experimental data for each response. The study demonstrates a satisfactory model fit, supported by high adjusted coefficients of determination (R²_Adj = 96.59 % for turbidity and R²_Adj = 93.61 % for COD). Optimal parameters—pH 7.5, coagulant dose 110 mg/L, flocculant dose 0.55 ml/L, and settling time 15 min—yield a 96 % reduction in turbidity and a 95 % reduction in COD. Furthermore, the combined treatment of flotation followed by coagulation-flocculation proves highly effective in achieving significant pollutant removal, showcasing the practical application of the design of experiments (DOE) in optimizing wastewater treatment processes.

Nanotechnology is an emerging field in modern materials science that has demonstrated significant results in combating various microbial diseases. Traditional methods for producing nanoparticles (NPs) involve the use of toxic chemical reducing agents and hazardous materials. Recently, there has been a growing interest in NPs obtained through green synthesis using plant extracts due to their versatility and environmentally friendly characteristics. The Cissus genus (Vitaceae) is cosmopolitan and comprises versatile plants with a vast array of bioactive phytocompounds. Some of these species are widely utilized in traditional medicine to address various ailments. This study aims to investigate the contributions of Cissus to nanoparticle biosynthesis with antibacterial properties, particularly in the context of the rising bacterial resistance. Additionally, to show the different mechanisms underlying the antibacterial activity of Cissus-derived NPs and explore potential future research directions in this dynamic field. The promising attributes of Cissus-derived NPs position them as robust candidates for the development of innovative antimicrobial nanomaterials and novel antibacterial agents targeted at addressing bacterial resistance. Ongoing research in this domain holds the potential to provide practical antibacterial strategies and contribute to sustainable and environmentally friendly solutions.