Maurizio Silveira Quadro’s research while affiliated with Federal University of Pelotas and other places
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Lead (Pb) contamination poses significant ecological and health risks due to its persistence and toxicity. Bacterial-assisted phytoremediation has emerged as a promising, eco-friendly strategy for Pb removal. This review focuses on the integration of bacteria in phytoremediation, exploring the mechanisms and factors that influence the effectiveness of this process. Case studies demonstrate that bacterial inoculation can increase Pb accumulation in plant tissues, enhance biomass growth, and reduce Pb contamination. Finally, challenges related to field applications, microorganism tolerance, and environmental variability are discussed. This review provides valuable insights into improving phytoremediation efficiency, thus contributing to the remediation of Pb-contaminated environments.
The increased presence of cadmium in the environment can lead to its increase in the food chain, particularly due to its accumulation in the consumable parts of plants. For humans, ingesting food containing high levels of Cd is a significant exposure pathway. Being a non-essential and non-metabolized element, it is harmful to microorganisms, animals, plants, and humans, even in minimal concentrations. As a result, there is a need for the remediation of both natural and urban environments. Bioremediation is a sustainable and eco-friendly technique for cleaning up the environment and reducing contamination of living organisms. This review explores the potential of phytoremediation, a bioremediation approach that utilizes plants as agents for decontamination, as a method to restore such areas. Certain plants, particularly macrophytes, are capable of remediating Cd. In response to induced stress, plants activate various tolerance mechanisms, including antioxidant enzyme systems (as peroxidase, catalase, ascorbate peroxidase, superoxide dismutase, and glutathione peroxidase) as well as non-enzymatic pathways (like phytochelatins). However, a thorough understanding of these tolerance mechanisms is essential for optimizing this method, especially for application in aquatic environments. This study will, therefore, review the existing tolerance and detoxification mechanisms for Cd, along with bioremediation strategies. The application of this eco-friendly approach is highly correlated with the three main areas required for sustainability: economic, environmental and social.
This study was conducted to explore the feasibility of developing an eco-friendly brick made from compressed recycled sand, sieved from locally available construction and demolition wastes (CDWs), and stabilized with a low content of blast-furnace slag cement. Ø5×5 cm bricks were produced through axial compression followed by axial extrusion. Their compositions underwent optimization to achieve bricks resistant to crumbling. Two compositions were studied, both with a ratio of water to sand of ~ 9%: a reference brick containing only sand and water, and a brick with a ratio of cement to sand of 2%. Subsequently, some properties and performances of the bricks were characterized. The results revealed that the stabilized brick achieved a compressive strength of up to 4.08 MPa, a diametral tensile strength of up to 0.149 MPa, a thermal conductivity of up to 0.461 W/ (m.K), and a minimum water porosity of 28.4%. Moreover, it demonstrated good water resistance during a 2-hour submersion. This affirms that the stabilized brick meets standard requirements, confirming its feasibility.
Uma preocupação atual e emergente tem sido a contaminação de mananciais por resíduos de medicamentos, uma vez que a diversidade de fármacos existentes implica que esta classe de compostos químicos possui diferentes atividades biológicas, que podem ser mantidas mesmo após metabolização e excreção destes compostos para o meio ambiente. O aumento contínuo da presença destes compostos nos mananciais de abastecimento representa uma das problemáticas mundiais do comprometimento da qualidade das águas destinadas para o consumo humano e dos prejuízos inerentes sobre os ambientes aquáticos impactados por estes compostos. Dessa forma, esta revisão de literatura teve como objetivo discutir os conhecimentos sobre a problemática dos fármacos no meio ambiente, através da análise de diferentes trabalhos e estudos de caso que abordam essa temática. A pesquisa caracterizou-se como uma revisão bibliográfica, desenvolvida com base em materiais já elaborados, e tem como objetivo explorar um tema com base em referências teóricas publicadas em livros, revistas científicas, periódicos, entre outros. Na busca, foram definidas palavras-chave de modo a facilitar a procura dos artigos, sendo elas: "pharmaceuticals" AND "environmental"; bem como foi definido o período, conforme o ano de publicação, do ano de 2010 até 2020. Foram selecionados três artigos para compor a revisão bibliográfica deste trabalho. De forma geral, os três estudos selecionados apontam uma emergente preocupação, com diferentes abordagens, a qual é a questão da contaminação do ambiente com fármacos. Os dois primeiros investigam a ocorrência de fármacos em lugares pontuais, enquanto o terceiro, baseado em estudos e relatos destas ocorrências, estabelece uma lista prioritária visando o monitoramento e tratamento destes fármacos encontrados. A partir dos estudos apresentados pode-se perceber que, apesar dos medicamentos possuírem uma função vital e serem imprescindíveis para o tratamento de determinadas enfermidades, a sua ocorrência em esgotos sanitários e águas naturais é um importante tópico internacional. Pode-se concluir que é possível discutir as causas e formas de identificação de medicamentos no ambiente, porém, os efeitos para os organismos ainda são desconhecidos, principalmente quando são tratados ao longo de cadeias tróficas. Portanto, fica evidente a necessidade de mais estudos a fim de diagnosticar a situação dos corpos hídricos ao redor do mundo, bem como a investigação dos seus efeitos nocivos e os sistemas de tratamento, de forma a buscar um gerenciamento mais eficaz dos resíduos de fármacos.
Chromium compounds are prominent contaminants due to their widespread use in various industries. The limited effectiveness of effluent treatment facilities and the expensive procedures needed for metals removal from water raise serious concerns about water quality. In this study, rigid polyurethane (PU) foam-green liquor dregs composite and their isolated phases were evaluated for removal of Cr(III) from laboratory water amended with Cr(III). The isolated dregs removed 81.93% of Cr(III), with a adsorption capacity of 135.45 mg g − 1. On the other hand, the dregs-foam composite displayed a Cr(III) percent removal and adsorption capacity of 36.02% and 57.56 mg g − 1 , respectively; and was comparable to plain PU. Results indicate that green liquor dregs can be used to remove chromium from water and for the construction of dregs-PU hybrid material for potential extraction of Cr(III) from water.
... While the manufacturing of polyurethanes containing waste biomass as fillers resulted in the new material which mechanical properties were highly dependant on the biofiller type (chitosane, cellulose, lignin) causing the decrease in the Young' modulus and elongation at break, the biomass fillers added in the presented bio-PU improved the mechanical properties [19]. Introduction of the peach pits and activated biochar as bio-fillers reflected on the water absorption properties of polyurethans but also open the applicative potential of PU in adsorption processes emphasizing at the same time the sustainable and environmental merits of using bio-fillers [86]. Moreover, the advanced polyurethane elastomers with added biopolymers (cellulose, lignin, and chitin) as fillers were developed resulting in the composites with the good processing parameters (processing times, density) and improved properties (abrasion resistance, tensile strength, contact angle, hardness), but with the irregular morphology with imperfections and biofiller particles aglomerates [87]. ...
... A suitable candidate for forming a heterojunction with TiO2 is graphitic carbon nitride (g-C3N4) [4,18]. g-C3N4 is a polymeric 2D material with a moderate bandgap (~2.7 eV), high stability, and non-toxicity [4,[18][19][20][21][22]. On the other hand, g-C3N4 typically has a low specific surface area and a high tendency to recombine charge carriers [4,11,19,23,24], suggesting the combination of TiO2 with g-C3N4 to overcome the disadvantages of both semiconductors [18,25,26]. ...
... [8] where CIMB Group Holdings Berhad has started their commitment in exempting coal from its portfolio by 2040 [9]. PETRONAS also declares its aspiration to achieve net zero carbon emissions by 2050 [10] along with MAYBANK pledging to achieve net-zero carbon emissions by 2050 in May 2021 [11]. ...
... The sensors are especially useful for monitoring cloud cover and investigating complex atmospheric phenomena. In the visible light range, satellites capture images during the day, while in the near and mid-infrared, they detect thermal radiation, allowing observations even during the night or in low-light conditions (Arejano et al. 2023). ...
... Phenolic compounds, including flavonoids and tannins, have been shown to play a critical role in mitigating heavy metal toxicity by chelating metal ions and reducing their bioavailability. However, with long-term exposure to high concentrations of heavy metals, the production of these compounds may decrease due to the suppression of key enzymes involved in their biosynthesis [70]. ...
... Therefore, adsorbents or flocculators can effectively be used to enhance the separation of impurities from the used engine oil (UEO). A variety of adsorbents have been traditionally used to adsorb contaminants in waste engine oils (Benk, 2021;Boadu Kwasi et al., 2020;Daham et al., 2017;Farias et al., 2023;Mohammed et al., 2013;Parekh et al., 2023;Shabanzade et al., 2018;Yang et al., 2013). ...
... The adsorp-tion kinetics can be exploited to evaluate the solute absorption rate, used to verify the equilibrium time, as well as to unveil the time required for the adsorbent and adsorbent interaction to be preserved. Kinetic parameters are important because they are used as a means of estimating the size and transfer rate of industrial equipment adsorption systems (Farias et al., 2022). ...
... They concluded that the addition of WTP sludge to the soil mixture causes a decrease in the k coefficient. Morselli et al. (2022) [25], when conducting the test on compacted material of 100% dehydrated WTP sludge, obtained a k value equal to 1.64 × 10 −4 cm s −1 . ...
... For example, a pilot-scale rotating biological contactors removed 76% of biochemical oxygen demand and 33% of chemical oxygen demand with initial biochemical oxygen demand and chemical oxygen demand concentrations of 701.4-2,124.3 mg/L and 2,788-5,864 mg/L, respectively [208]. The toxicity of the rotating biological contactor-treated leachate was effectively reduced, promoting the germination rates of lettuce (48%) and cucumber (66%). ...
... The treatment of textile effluents generally involves a combination of conventional physicochemical and biological processes (Otto et al., 2021). Biological treatment systems, such as activated sludge, are quite common and allow for high removal of organic matter and solids but are inefficient at removing dyes (Albahnasawi et al., 2020;Azanaw et al., 2022). ...
