{"title":"Unveiling Pr6O11 as a Promising Adsorbent for Eriochrome Black-T Removal: Kinetic, Thermodynamic, and Isotherm Investigations","authors":"Lipika Nayak, Siba Soren, Nigamananda Das, Purnendu Parhi","doi":"10.1007/s11270-025-07830-5","DOIUrl":null,"url":null,"abstract":"<div><p>This study explored the potential of praseodymium oxide (Pr<sub>6</sub>O<sub>11</sub>) as an adsorbent for removing Erichrome Black T (EBT) dye from an aqueous solution. Pr<sub>6</sub>O<sub>11</sub>, with a surface area (24.1 m<sup>2</sup>/g), was synthesized using a hydrothermal method and characterized using various analytical techniques (XRD, FTIR, SEM, TEM, BET, XPS). The initial dye concentration, adsorbent dose, pH, and temperature on adsorption capacity were varied to derive the adsorption and kinetic parameters. The optimal conditions were: 60 mg/L initial dye concentration, 0.3 g/L adsorbent dosage, 90 min contact time, and pH 3.5. The heterogeneous adsorption of dyes by the prepared catalyst was best described by the Freundlich adsorption isotherm model which favours multilayer adsorption of EBT dye onto Pr<sub>6</sub>O<sub>11</sub> surface. Kinetic study confirms the progress of adsorption via pseudo-second-order kinetics. Different thermodynamic parameters such as ΔG⁰, ΔH⁰, ΔS⁰ calculated during the experiment suggested a favourable, spontaneous, and exothermic physisorption process (30–50 °C). The material exhibited reusability with minimal capacity loss after each cycle.</p><h3>Graphical Abstract</h3>\n<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"236 4","pages":""},"PeriodicalIF":3.0000,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Water, Air, & Soil Pollution","FirstCategoryId":"6","ListUrlMain":"https://link.springer.com/article/10.1007/s11270-025-07830-5","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
This study explored the potential of praseodymium oxide (Pr6O11) as an adsorbent for removing Erichrome Black T (EBT) dye from an aqueous solution. Pr6O11, with a surface area (24.1 m2/g), was synthesized using a hydrothermal method and characterized using various analytical techniques (XRD, FTIR, SEM, TEM, BET, XPS). The initial dye concentration, adsorbent dose, pH, and temperature on adsorption capacity were varied to derive the adsorption and kinetic parameters. The optimal conditions were: 60 mg/L initial dye concentration, 0.3 g/L adsorbent dosage, 90 min contact time, and pH 3.5. The heterogeneous adsorption of dyes by the prepared catalyst was best described by the Freundlich adsorption isotherm model which favours multilayer adsorption of EBT dye onto Pr6O11 surface. Kinetic study confirms the progress of adsorption via pseudo-second-order kinetics. Different thermodynamic parameters such as ΔG⁰, ΔH⁰, ΔS⁰ calculated during the experiment suggested a favourable, spontaneous, and exothermic physisorption process (30–50 °C). The material exhibited reusability with minimal capacity loss after each cycle.
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Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments.
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Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.
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