Influence of hydrological flows from tropical watersheds on the dynamics of Cu and Zn in sediments

Schiller, Andréia da Paz; Ferronato, Michelli Caroline; Schwantes, Daniel; Gonçalves, Affonso Celso; Barilli, Deoclécio José; Manfrin, Jéssica

doi:10.1007/s10661-019-7193-x

Cited by 16 publications

(8 citation statements)

References 27 publications

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“…Copper (Cu), Chromium (Cr), Manganese (Mn), Nickel (Ni), Lead (Pb), and Zinc (Zn) have been chosen due to their toxic potential (Consalter et al, 2019;Mizael et al, 2020;Schaumlöffel, 2012;Da Paz Schiller et al, 2019), complexation capacity with the OM and thin fraction of the sediment (Föstner & Salomons, 1980). Besides that, these metals are widely used in agricultural, industrial, and mining activities (Bernardi et al, 2020) around the studied region, which can lead to higher concentrations in the reservoir.…”

Section: Metal Concentrationsmentioning

confidence: 99%

Land use, spatial heterogeneity of organic matter, granulometric fractions and metal complexation in reservoir sediments

et al. 2021

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Aim This study aimed to evaluate land use, distribution of particle size fractions, organic matter (OM) and perform a metal quantification liable to complexation in the Itupararanga Reservoir (São Paulo, Brazil). This aquatic ecosystem is used for water supply and energy generation and is constantly subjected to anthropogenic impacts that alter its physical and chemical characteristics. Methods In a single campaign, samples of surface sediment (10 cm) were collected from nine sampling stations, in triplicate, along the reservoir. The collection was carried out with a “Lenz” type bottom sampler. The physicochemical variables, including the quantification of the metals copper, chromium, manganese, nickel, lead and zinc, were evaluated by basic descriptive statistics techniques combined with geostatistics and the use of remote sensing. Results All along the reservoir the sediment is predominantly organic and water depth interfered directly in the OM concentration and particle size distribution. Therefore, heterogeneity was observed regarding OM contents, particle size fractions and metals, with the exception of chromium, and the three zones of the reservoir proved to be distinct from each other. The land use classification showed the real situation of the Environmental Protection Area (EPA) and the results indicate that the central portion is more subject to anthropic impacts, while the dam region has high levels of metals, probably originated from the activities in the reservoir’s surroundings. Conclusions The soil erosion in the reservoir’s region shows the lack of efficiency in the Itupararanga EPA’s management, being needed a strategic coordination among the municipalities to enhance its conservation.

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Section: Metal Concentrationsmentioning

confidence: 99%

Land use, spatial heterogeneity of organic matter, granulometric fractions and metal complexation in reservoir sediments

et al. 2021

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“…Under the experimental conditions of pH (3.0 to 7.0 in adsorption studies), positive surface charges predominate, favoring the adsorption of anions. However, for higher pH values, such as alkaline effluents (11)(12)(13), negative charges in the surface of the ACs will predominate, which can favor the adsorption of cations [27], such as Cd 2+ and other metals.…”

Section: Determination Of the Chemical Composition Of The Activated Carbons (Acs)mentioning

confidence: 99%

“…This last statement has especial importance regarding water treatment technologies. In the last decades, industrialization, agriculture, and expanding urbanization have increased the pressure on fresh water bodies, causing high levels of pollutants, in many cases of contamination with metals [3,4], pesticides [5][6][7], organic matter [8,9], and their environmental impacts on sediments, benthic organisms, humans, i.e., the trophic chain as a whole [7,[10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effective Cd2+ removal from water using novel micro-mesoporous activated carbons obtained from tobacco: CCD approach, optimization, kinetic, and isotherm studies

Manfrin

Gonçalves

Schwantes

et al. 2021

J Environ Health Sci Engineer

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Purpose This research aimed to develop activated carbons from tobacco by double (thermal-physical) and triple activations (thermal-chemical-physical) for high-efficiency removal of Cd 2+ . Methods The adsorbents were characterized by their chemical composition, point of zero charge (pH PZC ), SEM, FT-IR, BET, and BJH. The subsequent adsorption studies were conducted: optimal conditions (CCD on adsorbent dose versus pH of Cd 2+ solution), kinetics, equilibrium, thermodynamics, and desorption studies. ResultsThe activated carbons have irregular and heterogeneous morphology, surface functional groups COO-, C-O, C-O-C, C=O and O-H, pH PZC of 11.11 and 10.86, and enhanced SSA (especially for CT NaOH + CO 2 = 103.40 g m −2 ). The optimal conditions for Cd 2+ adsorption occur using 4.0 g L −1 , pH from 3.0 to 7.0, with most of the Cd 2+ adsorbed in the first 10-20 min. The goodness of the fit found for pseudo-first order, pseudo-second order, intraparticle diffusion, Langmuir, Freundlich, Dubinin-Radushkevich, Sips, and Temkin suggest the occurrence of Cd 2+ chemisorption and physisorption in mono and multilayers. The values of ∆G° < 0 kJ mol −1 indicate that the observed phenomena are energetically favorable and spontaneous; the values of ∆H° < 0 and the effective desorption rates (58.52% and 44.64%) suggest that the adsorption of Cd 2+ is ruled mainly (but not only) by physical interactions. Conclusion Our excellent results on Cd 2+ removal allow us to state that tobacco use as a raw material for adsorbent development is a renewable and eco-friendly technique, allowing the production of highly effective activated carbons and providing an adequate destination for this waste. KeywordsAlternative adsorbents • Cadmium removal • CCD approach • Advanced water treatment • Nicotiana tabacum • Cigarettes * Daniel Schwantes

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“…3 The increasing pollution levels in the environment, especially in developing countries, increase the importance of aiming for better water quality management. 4,5 Therefore, researchers all over the world seek to develop low-cost and environmentally friendly technologies for treating polluted waters 1,[6][7][8] to avoid costly adsorption technologies, such as commercial activated carbon (AC). 9 In this sense, biochar derived from agro-industrial residues has proven to be an effective alternative for removing some of the most hazardous water contaminants, adding value to the byproducts of agro-industry.…”

Section: Introductionmentioning

confidence: 99%

Canola meal‐derived activated biochar treated with NaOH and CO₂ as an effective tool for Cd removal

Gonçalves

Schwantes

Braccini

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: This research assessed the capacity for Cd 2+ removal from water using canola meal-based adsorbents: canola meal chemically activated with 1 mol L -1 NaOH and pyrolyzed for 1 h at 500 °C (CAC) and the second product obtained with a similar process but with a second pyrolysis at 750 °C in CO 2 flow (CAC-CO 2 ). The materials were characterized by their chemical composition and thermal stability and using Fourier transform infrared spectroscopy, pH at point of zero charge (pH PZC ) and scanning electron microscopy. Hydroxyl and carboxyl are the most likely surface functional groups responsible for adsorption. RESULTS:The obtained pH PZC values were 10.83 for CAC and 9.84 for CAC-CO 2 . Both materials presented heterogeneous surfaces with many cavities, which increased their respective surface specific area 23 000-and 540 000-fold compared to canola meal biomass. Our best results were obtained using 4.0 g L −1 of adsorbent, at pH 7.0, with an equilibrium time of 40 and 60 min for CAC and CAC-CO 2 , respectively. The most likely mechanism predominantly involved in Cd adsorption is physical, according to Temkin nonlinear parameters, thermodynamics parameters and excellent recovery rates (67.8%).CONCLUSIONS: The use of canola meal as a feedstock for activated biochar production is an attractive and new possibility for producing a competitive adsorbent.

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Influence of hydrological flows from tropical watersheds on the dynamics of Cu and Zn in sediments

Cited by 16 publications

References 27 publications

Land use, spatial heterogeneity of organic matter, granulometric fractions and metal complexation in reservoir sediments

Land use, spatial heterogeneity of organic matter, granulometric fractions and metal complexation in reservoir sediments

Effective Cd2+ removal from water using novel micro-mesoporous activated carbons obtained from tobacco: CCD approach, optimization, kinetic, and isotherm studies

Canola meal‐derived activated biochar treated with NaOH and CO₂ as an effective tool for Cd removal

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Influence of hydrological flows from tropical watersheds on the dynamics of Cu and Zn in sediments

Cited by 16 publications

References 27 publications

Land use, spatial heterogeneity of organic matter, granulometric fractions and metal complexation in reservoir sediments

Land use, spatial heterogeneity of organic matter, granulometric fractions and metal complexation in reservoir sediments

Effective Cd2+ removal from water using novel micro-mesoporous activated carbons obtained from tobacco: CCD approach, optimization, kinetic, and isotherm studies

Canola meal‐derived activated biochar treated with NaOH and CO2 as an effective tool for Cd removal

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Product

Resources

About

Canola meal‐derived activated biochar treated with NaOH and CO₂ as an effective tool for Cd removal