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Removal of textile dyes in wastewater using polyelectrolytes containing tetrazole groups
Martín Caldera-Vil,Alejandra-Alicia Peláez-Cid,Miriam-Amelia Martins-Alho,Ana-María Herrera-González 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.12
Textile dyes are some of the pollutants which have received the most attention because of the large volume of wastewater generated by the textile industry. Removal by means of adsorption is one of the most versatile alternatives to treat these effluents. Even though different adsorbents such as activated carbons and mineral materials have been proposed, polymeric adsorbents are a viable alternative. This work reports for the first time the use of polyelectrolyte PTZ and macroelectrolyte MTZ containing tetrazole groups as adsorbents useful in the textile dyes removal present in aqueous solutions and wastewater. Because of the anionic character of the tetrazole group, MTZ exhibits selective adsorption capabilities for cationic dyes of up to 156.25mg·g1. The kinetic study of the process of adsorption shows that PTZ and MTZ fit a pseudo second-order model. MTZ also shows utility as a flocculant agent in the treatment of wastewater containing dyes Indigo Blue and Reactive Black. The results showed that PTZ and MTZ may be used in the treatment of wastewater in a process of coagulation-flocculation followed by the treatment by adsorption. This twostage treatment removed up to 95% of the dye present in the wastewater. As well as removing the dyes, the values for COD, suspended solids, pH, and color of the wastewater decreased, thus significantly improving its quality.
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Gloria Alicia Pérez-Arias,Iran Alia-Tejacal,María Teresa Colinas-León,Luis Alonso Valdez-Aguilar,Clara Pelayo-Zaldívar 한국원예학회 2019 Horticulture, Environment, and Biotechnology Vol.60 No.3
The tuberose ( Polianthes tuberosa L.) is an ornamental plant native to Mexico with fl owers that are popular due to theirdelicate beauty and intense fragrance. However, as a plant resource, it has not been well studied or commercialized. If properlymanaged and/or exploited, this cut fl ower crop has the potential to further develop and expand the Mexican ornamentalhorticultural industry. At present, few studies have focused on increasing its relatively short shelf-life, which lasts about7–10 day postharvest. As a result, this review focuses on basic aspects of the cut fl ower’s physiology, biochemistry, waterrelations, and postharvest fl oral opening. Also included are its response to cooling, the implementation of diff erent packingstrategies, the application of pulsing, preservative, and hydrating solutions, and the use of 1-methylcyclopropene as aninhibitor of ethylene action. A thorough analysis of all these technologies, their mode of action, and their infl uence on thephysiological response of cut tuberose is essential for the improvement of postharvest management strategies. It is hopedthat both handlers and distributors can benefi t from this information and be successful in prolonging the shelf-life of thisvaluable ornamental resource.
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Farzaneh Bekhradi,Mojtaba Delshad,Alicia Marín,Maria C Luna,Yolanda Garrido,Abdolkarim Kashi,Mesbah Babalar,Maria I Gil 한국원예학회 2015 Horticulture, Environment, and Biotechnology Vol.56 No.6
This study examined the effects of salt stress on the physiological responses and postharvest quality characteristics of fresh sweet basil (Ocimum basilicum L.). Plants were treated with 40 and 80 mM NaCl for 25 days during cultivation in 2014. Two green genotypes, Green Iranian and Genovese basil, were studied after harvest, and while two Iranian genotypes, Green and Purple Iranian basil, were compared during storage. Yield and the stem length were significantly reduced under salt stress only in the two Iranian cultivars. Salinity significantly reduced leaf thickness and the area of parenchyma cells in both Green Iranian and Genovese basil. As salt concentration increased, transpiration and the content of chlorophylls decreased significantly while the lipid peroxidation increased in the Genovese genotype. During storage at 12°C, the respiration rate of salt-stressed leaves was similar to that of control leaves. The visual quality of Purple Iranian basil was better preserved during storage than the Green Iranian basil. However, salt stress positively affected the visual quality of Green Iranian basil, decreasing darkening and maintaining the quality above the limit of marketability after 7 days of storage. The total content of phenolic acids and anthocyanins did not show significant differences between growth conditions. However, during storage of Green Iranian basil, salt stress increased the content of individual and total phenolic acids compared to the control. To summarize, the positive or negative effects of salt stress on basil depend on the degree of tolerance of the different genotypes.
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Ledesma Achem Miryam Emilse,Haro Cecilia,Terán Magdalena María,Mónaco María Eugenia,Issé Blanca Alicia,Sandra Stella Lazarte 대한혈액학회 2018 Blood Research Vol.53 No.1
Background Hereditary spherocytosis (HS) is a chronic hemolytic anemia characterized by microspherocytes in the peripheral blood and increased erythrocyte osmotic fragility (EOF). This study evaluated the cryohemolysis test (CHT); initial hemolysis (IH); immediate and incubated hemolysis percentage in 5.5 g/L NaCl (H5.5); mean corpuscular hemoglobin concentration (MCHC); red blood cell distribution width (RDW); and Hb/MCHC, Hb/RDW, and MCHC/RDW ratios for the diagnosis of HS. Methods Data from 13 patients with HS were evaluated at the Instituto de Bioquímica Aplicada and compared with data from 14 unaffected individuals and 11 patients with anemia due to another etiology. Total blood and reticulocyte counts, CHT, and immediate and incubated EOF were performed in all subjects; sensitivity, specificity, efficiency, and Youden index (YI) were calculated. Results Eight patients with HS had MCHC ≥345 g/L, 10 had RDW ≥14.5%, 12 had IH >5.0 g/L, 11 had immediate H5.5 ≥5%, and 13 had incubated H5.5 ≥50% (the cut-off value to consider HS). The efficiency and YI were: immediate H5.5 (0.94‒0.85), incubated H5.5 (0.89‒0.82), IH (0.89‒0.78), MCHC (0.87‒0.62), CHT (0.84‒0.54), and Hb/MCHC (0.71‒ 0.56), respectively. The calculated ratios could distinguish subjects with HS from unaffected individuals (P<0.05), but not those with anemia of another etiology (P>0.05). Conclusion Although the CHT and supplementary hematimetric indexes were useful to differentiate individuals with SH from healthy controls, they cannot distinguish from anemias of other etiology. CHT and MCHC, in addition to EOF, are recommended for diagnosing HS patients because of their low cost and efficiency.
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