Browsing by Author "Schwantes, Daniel"
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- ItemAdsorbents developed from residual biomass of canola grains for the removal of lead from water(2020) Goncalves, A. C.; Braccini, A. L.; Schwantes, Daniel; Campagnolo, M. A.; Schiller, A. D.; Manfrin, J.; Conradi, E.; Zimmermann, J.
- ItemAdsorption of Cd (II), Pb (II) and Cr (III) on chemically modified Euterpe Oleracea biomass for the remediation of water pollution(UNIV ESTADUAL MARINGA, PRO-REITORIA PESQUISA POS-GRADUACAO, 2021) Goncalves Junior, Affonso Celso; Schwantes, Daniel; Conradi Junior, Elio; Zimmermann, Juliano; Coelho, Gustavo FerreiraThis study evaluated the use of Euterpe oleracea endocarp after chemical modification with H2O2, H2SO4 and NaOH for the removal of Cd2+, Pb2+ and Cr3+ from water. Therefore, the adsorbent was characterized for its chemical composition, Fourier Transform Infrared (FTIR) analysis, Scanning Electron Microscope (SEM) images, and pH of point of zero charge (pH(PZC)), thermal stability and porosimetry. Adsorption tests were conducted by using a Central Composite Design (CCD). Pseudo-first order, pseudosecond order, Elovich and intraparticle diffusion models evaluated the adsorption kinetics, and sorption isotherms were linearized according to Langmuir, Freundlich and Dubinin- Radushkevich. The effect of initial concentration, temperature in the process and the desorption were also analyzed. SEM results showed that the acai adsorbents (or CA) had irregular and heterogeneous structure, and IR analysis evidenced the presence of hydroxyl, aliphatic, phenolic and carboxylic surface groups; both analyses indicate favorable adsorption characteristics. The pHPZC of the adsorbent is 4.41, 4.02 and 7.10 for CA modified with H2O2, H2SO4 and NaOH, respectively. The optimum adsorption conditions were pH 5.0, within 40 min, with 4 g L-1 as the ideal adsorbent dose. The predominance of chemisorption occurs, in mono and multilayer. The adsorption is only spontaneous for Cd2+ at 15 and 25 degrees C. The CA has the potential to increase the removal efficiency of Cd, Pb and Cr, when chemically modified, particularly with H2O2 and H2SO4.
- ItemAtrazine fate in Rhodic Ferralsol grown with corn under high-intensity rainfall conditions(2023) Affonso Celso Gonçalves, Junior; Elio Conradi, Junior; Schwantes, Daniel; Vander Kaufmann; Alessandro Lucca Braccini; Tiago Roque Benetoli da Silva; Mario Aranda; Juliano Zimmermann
- ItemCanola meal‐derived activated biochar treated with NaOH and CO2 as an effective tool for Cd removal(2022) Affonso C Gonçalves, Jr; Schwantes, Daniel; Alessandro L Braccini; Francisco Albornoz; Élio Conradi, Jr; Juliano Zimmermann
- ItemCr(total) Removal Using Chicken Feathers Derived Materials: A Laboratory Study with Adsorption-precipitation in Electroplating Effluents(2022) Marcelo Angelo Campagnolo; Affonso Celso Gonçalves, Jr.; Schwantes, Daniel; Douglas Cardoso Dragunski; Tanicler Demetrio; Leonardo Henrique Deminski
- ItemDetermination of CHLORPYRIFOS by GC/ECD in water and its sorption mechanism study in a RHODIC FERRALSOL(2020) Schwantes, Daniel; Goncalves, A. C.; Conradi, E.; Campagnolo, M. A.; Zimmermann, J.
- ItemDevelopment of biochar and activated carbon from cigarettes wastes and their applications in Pb2+ adsorption(2021) Manfrin, Jessica; Goncalves Jr, Affonso Celso; Schwantes, Daniel; Conradi Jr, Elio; Zimmermann, Juliano; Ziemer, Guilherme Lindner
- ItemDevelopment of renewable adsorbent from cigarettes for lead removal from water(2019) Elio Conradi, Jr.; Affonso Celso Gonçalves, Jr.; Schwantes, Daniel; Jéssica Manfrin; Andréia Schiller; Juliano Zimmerman; Gabriel José Klassen; Guilherme Lindner Ziemer
- ItemDistribution of heavy metals in sediments and their bioaccumulation on benthic macroinvertebrates in a tropical Brazilian watershed(2021) Schwantes, Daniel; Goncalves Junior, Affonso Celso; Manfrin, Jessica; Campagnolo, Marcelo Angelo; Zimmermann, Juliano; Conradi Junior, Elio; Bertoldo, Danieli Cristina
- ItemEco-friendly, renewable Crambe abyssinica Hochst-based adsorbents remove high quantities of Zn2+ in water(2020) Schwantes, Daniel; Affonso Celso Gonçalves; Andreia da Paz Schiller; Jéssica Manfrin; Luiz Alberto Verderio Bianco; Andressa Giombelli Rosenberger
- ItemEcofriendly Biosorbents Produced from Cassava Solid Wastes: Sustainable Technology for the Removal of Cd2+, Pb2+, and Crtotal(2022) Schwantes, Daniel; Affonso Celso Gonçalves Junior; Henrique Alipio Perina; César Ricardo Teixeira Tarley; Douglas Cardoso Dragunski; Elio Conradi Junior; Juliano Zimmermann; Muhammad Raziq Rahimi Kooh
- ItemEffect of Chitosan–Riboflavin Bioconjugate on Green Mold Caused by Penicillium digitatum in Lemon Fruit(2024) Ipinza Concha, Brenda Michelle; Dibona Villanueva, Luciano Francesco; Fuentealba Patiño, Denis Alberto; Pinilla Quispe, Alexander; Schwantes, Daniel; Garzón Nivia, María Alejandra; Herrera Défaz, Mario Andrés; Valdés Gómez, HéctorPenicillium digitatum is the causal agent of green mold, a primary postharvest disease of citrus fruits. This study evaluated the efficacy of a novel photoactive chitosan–riboflavin bioconjugate (CH-RF) to control green mold in vitro and in lemon fruit. The results showed total inhibition of P. digitatum growth on APDA supplemented with CH-RF at 0.5% (w/v) and a significant reduction of 84.8% at 0.25% (w/v). Lemons treated with CH-RF and kept under controlled conditions (20 °C and 90–95% relative humidity) exhibited a noteworthy reduction in green mold incidence four days post-inoculation. Notably, these effects persisted, with all treatments remaining significantly distinct from the control group until day 14. Furthermore, CH-RF showed high control of green mold in lemons after 20 days of cold storage (5 ± 1 °C). The disease incidence five days after cold storage indicated significant differences from the values observed in the control. Most CH-RF treatments showed enhanced control of green mold when riboflavin was activated by white-light exposure. These findings suggest that this novel fungicide could be a viable alternative to conventional synthetic fungicides, allowing more sustainable management of lemon fruit diseases.
- ItemEffects of Successive Top-Dressing Application of Lime on a Sweet Cherry Orchard in Southern Chile(MDPI, 2024) Artacho Vargas, Pamela Natalia; Schwantes, Daniel; Martabit Jacob, Pablo; Bonomelli de Pinaga, Claudia MaríaAnnual top-dressing application of agricultural lime is a common practice in fruit orchards on acidic soils in southern Chile, which could result in surface over-liming and base imbalances. A trial was performed in a cherry orchard with an 8-year history of surface liming to evaluate the effectiveness of lime materials in neutralizing acidity in the soil profile and the effect on the tree nutritional status. No-lime (NL), calcitic (AgL), hydrated (HL), and liquid (LL) lime treatments were applied on soil surface at commercial rates, and soil acidity variables were measured at depths of 0-5, 5-10, and 10-20 cm in samples collected at 0, 15, 30, 60, and 225 days after application. Tree nutritional status was evaluated through foliar analysis. Top-dressing application of AgL was ineffective in ameliorating subsoil acidity at depths >5 cm, even in high-rainfall conditions. HL did not exhibit greater alkalinity mobility compared to AgL, although it had a faster but shorter-lived reaction. At the manufacturer-recommended rates, LL application was ineffective. After 8 years of top-dressing liming with AgL, a significant stratification of soil pH, Al, and Ca was observed. However, foliar concentration of bases did not reflect the surface Ca accumulation in soil, discarding an antagonistic cation competition for tree uptake.
- ItemEfficiency of combined techniques in pesticide residues removal from food: a systematic review(Springer Nature, 2025) Flores Takahashi, José Satoshi; Schwantes, Daniel; Gonçalves Jr., Affonso Celso; Fuentealba Patiño, Denis Alberto; Valdés Gómez, Héctor; Piccioli, Angélica de Fatima BortolatoThe global use of pesticides has steadily increased in recent years to enhance food production and protection and prolonge its shelf life. Nevertheless, pesticide residues and their association with various human diseases have raised concerns among the population, as the primary route of human exposure to pesticides is through food consumption. Consequently, removing pesticide residues from agricultural products and food is crucial for mitigating associated risks. Various treatments are employed to eliminate and degrade pesticide residues, with commonly used conventional techniques such as washing, peeling, and cooking being used. Additionally, emerging techniques such as ultrasound, ozone, electric current, plasma, and ultraviolet light have been applied to remove these residues. In this study, we systematically reviewed 38 articles to assess the efficacy of combined techniques for pesticide residue removal in food. The findings revealed that using combined techniques resulted in significantly higher levels of residue removal. Furthermore, combining emerging techniques with other treatments has demonstrated increased removal efficiency, significantly reducing the variability in the percentage range of residue removal. The synergistic use of ultrasound, ozone, and ultraviolet light techniques demonstrated a notably enhanced efficacy in removing pesticides, resulting in a higher elimination percentage. Among the 38 studies, 12 exhibited substantially lower variability. Moreover, ultrasound emerged as the technique with the most significant synergistic effect when combined with other techniques, enhancing the overall efficiency of pesticide residue removal. Among the 12 studies with lower variability, 9 incorporated ultrasound, 4 ozone, and 3 ultraviolet light as part of the combined treatment. However, it is essential to note that conventional techniques also achieved considerable residue removal, even with more significant variability. This information can serve as valuable guidance for managers, decision-makers, and the public in effectively selecting appropriate techniques to eliminate pesticide residues from food before consumption or sale.
- ItemEnvironmental fate of chlorpyrifos in Rhodic Ferralsol grown with corn during summer and winter seasons under high-intensity rainfall(2023) Affonso Celso Gonçalves, Jr.; Elio Conradi Junior; Schwantes, Daniel; Adilson Pinheiro; Vander Kaufmann; Aline Snak
- ItemEvaluation of benthic macroinvertebrates as indicators of metal pollution in Brazilian rivers(TAYLOR & FRANCIS LTD, 2021) Manfrin, Jessica; Schwantes, Daniel; Goncalves, Affonso Celso, Jr.; Schiller, Andreia da Paz; Zimmermann, Juliano; Dias de Oliveira, Vinicius HenriqueThe evaluation of water resources quality is an important tool for controlling and monitoring water bodies, among which, the evaluation of toxic metal levels in benthic macroinvertebrates has been highlighted. This study aimed to evaluate the biological quality of the Alvorada and Mandaguari rivers and to evaluate the metal bioaccumulation by means of the metal concentrations in surface waters, bottom sediments and benthic macroinvertebrates. Samples of water, biological material and sediments were conducted at six sampling points, 3 points in each river during 12 months. Macroinvertebrates were sorted, identified and analysed from the biological metrics, BMWP' index and statistical analyses. The samples of benthic macroinvertebrates and sediments were submitted to nitroperchloric digestion for further determination of the metal content. The metal concentrations in sediment had become high in both rivers, reaching values of up to 1752.50 mg kg(-1) of Pb in point M1 and 53.80 mg kg(-1) of Cd in point M3. Macroinvertebrate tissues exhibited high levels of toxic metals, reaching values of 146.11 mg kg(-1) of Cr in point M1, 144.28 mg kg(-1) of Pb and 3.11 mg kg(-1) of Cd in point M3, which indicates the occurrence of bioaccumulation and insertion in the food chain. The results from the evaluation using the BMWP' index do not present the real conditions of the watersheds, which suggests a review of the evaluation method. In addition, the environmental evaluation using macroinvertebrates is a good tool to verify the impacts in a river.
- ItemExposure to pesticides in Chile and its relationship with carcinogenic potential: a review(Frontiers Media SA, 2025) Munoz-Quezada, María Teresa; Iglesias, Verónica; Zúñiga-Venegas, Liliana; Pancetti, Floria; Foerster, Claudia; Landeros, Natalia; Lucero, Boris; Schwantes, Daniel; Cortes Arancibia, Sandra IsabelBackground: The widespread application of pesticides in agriculture and the consequent heightened human exposure to these potentially harmful substances present considerable environmental and health risks. The potential link to cancer is particularly concerning, underscoring the urgent need for more sustainable and health-conscious agricultural practices. Pesticides are pervasive global contaminants, with exposure occurring through various routes. Improper use is associated with genotoxicity, neurobehavioral problems, thyroid dysfunction, reproductive issues, and cancer, among other deleterious damages. While pesticide exposure is evident in Chile, a direct link to cancer remains uncertain. Objective: To examine the scientific evidence on pesticides exposure in the environment and human populations, and its relationship with cancer in Chilean territory. Methods: The search for original articles was performed in international peer-reviewed scientific databases, including Scopus, Web of Science (WoS), and PubMed Advanced Search Builder. Following the PRISMA extension for review guidelines, the search included studies on environmental pesticide exposure, human biomarker assessments, experimental investigations, and the potential pesticide-cancer associations in Chile. Foreign studies, systematic reviews, and meta-analyses were excluded. Results: Among the 83 qualifying studies conducted between 1996 and 2024, elevated pesticide exposure risks were documented, with 71% indicating high concentrations that may pose health risk. Additionally, 20% of studies reported significant chlorinated compounds, including organochlorines (OCs) and polychlorinated biphenyls (PCBs), while 79.5% identified carcinogenic to humans classified by the International Agency for Research on Cancer. The review emphasizes the urgent need to update pesticide-related regulations in Chile, including implementing bans or restrictions on carcinogenic pesticides and establishing stricter standards for allowable pesticide residue levels in food. Conclusion: Long-term epidemiological studies are essential to establishing concrete links between pesticide exposure and specific types of cancer. Additionally, investigating epigenetic markers associated with pesticide exposure, especially in occupational settings, is critical. Furthermore, allocating resources and prioritizing further research is fundamental, particularly in regions with substantial agricultural exposure.
- ItemFate of atrazine in soybean (Glycine max L.) and corn (Zea mays L.) succession in Brazilian subtropical conditions(2024) Goncalves Jr, Affonso Celso; Conradi Jr, Elio; Schwantes, Daniel; Braccini, Alessandro; Pinheiro, Adilson; Conradi, GustavoThis work aimed to evaluate the distribution of atrazine via surface runoff, leaching, and retention in a Rhodic Ferralsol and to analyze the effect of a succession of corn and soybean crops in Brazilian subtropical edaphoclimatic conditions on the distribution of this herbicide. The mobility of atrazine was evaluated using a drainage lysimeter under conditions of intensely simulated precipitation, carried out 24 h and 48 h after a single herbicide application at 17 days after corn emergence. Surface runoff and leaching were sampled during the rainfall simulations at intervals of 5 min until completing 1 h. Corn foliar analyses were carried out to measure the residual amounts of atrazine. In addition, laboratory studies of sorption (equilibrium and thermodynamics) and dissipation were carried out to understand the dynamics of atrazine in the soil. Freundlich's non-linear isotherms presented an excellent fit in the description of atrazine sorption in a Rhodic Ferralsol. The high content of organic matter in the soil and the temperature variation directly influences the retention of atrazine in the soil. The halflife (t1/2) of atrazine in soil under controlled conditions indicates a non-persistent pesticide, with 14.44 days. However, the herbicide can persist in deep soil layers for more than 93 days after spraying. When high-intensity rainfall occurs 24 h after application, large proportions of atrazine are lost by runoff within the first 20 min of rain. At the same time, significantly inferior losses are observed when rainfall occurs 48 h after spraying. Highintensity rainfall within 24 h of atrazine application leads to substantial losses, causing an approximate 84% reduction in its concentration in corn leaves and a 94% reduction in soil. Conservationist agronomic practices that protect the soil, especially during the initial periods of corn cultivation, are essential to reduce atrazine losses by runoff or leaching. In addition, increasing the concentration of organic matter in the soil can be extremely promising in increasing the retention of this pesticide to soil colloids, preventing its loss in soils with a low content of clay minerals.
- ItemGrowth and accumulation of Pb by roots and shoots of Brassica juncea L.(2020) Bassegio, C.; Campagnolo, M.A.; Schwantes, Daniel; Goncalves, A.C.; Manfrin, J.; Schiller, A.D.; Bassegio, D.
- ItemHighly porous activated carbon from recycled tobacco waste: a promising adsorbent for thiamethoxam removal.(2024) Gonçalves Jr., Affonso Celso; Bortolato Piccioli, Angélica de Fátima; Conradi Jr., Elio; Schwantes, Daniel; Carraro, Bianca Pierina; Nacke, Herbert; Sobocinski Zanini, EmanuelEste trabalho teve como objetivo utilizar resíduos ilícitos de tabaco para produção de carvão ativado (CA) de grande área superficial e sua aplicação na remoção de tiametoxame da água. Por meio da ativação térmica e química, produzimos com sucesso CA derivados de tabaco, incluindo AC800-4-KOH, AC900-4-KOH e AC900-5-KOH. O AC900-4-KOH, em particular, apresentou uma área superficial excepcional de 3.294 m² g⁻¹, com grupos funcionais de superfície indicando sua aptidão para adsorção. Em nossa análise abrangente de adsorção, observamos a rápida remoção do tiametoxam, com mais de 95% de adsorção ocorrendo em apenas 5 minutos. O modelo de Freundlich descreveu melhor o processo de adsorção, revelando adsorção multicamadas nas superfícies AC inerentemente heterogêneas. Além disso, os resultados da isoterma de Langmuir destacaram a capacidade de adsorção máxima superior do AC900-4-KOH a 150,5 mg g⁻¹, ressaltando seu excepcional potencial de adsorção. As constantes de KLangmuir ilustraram ainda mais a robusta interação tiametoxam-AC, com AC900-5-KOH exibindo a maior afinidade. Nossos resultados demonstram a natureza espontânea, exotérmica e dependente da temperatura da adsorção do tiametoxam (ΔGº<0, ΔHº<0, ΔSº>0), enfatizando sua viabilidade termodinâmica favorável. Além disso, experimentos de eluição com água confirmaram a ausência de liberação significativa de metal dos adsorventes. Este estudo foi pioneiro no uso de resíduos de tabaco reciclado para produzir AC, apresentando capacidades excepcionais de adsorção de tiametoxam. Estas descobertas posicionam o AC como um candidato promissor para aplicações de tratamento de água e remediação ambiental.