{"title":"Manganese Oxide-Modified Serpentine for Manganese Removal from Groundwater: Performance and Optimization","authors":"Liping Zhang, Weiwei Wang, Yiyun An, Lifang Wang, Huitong Li, Zeyu Lian, Xiangshuai Guo, Yiqing Gao","doi":"10.1007/s11270-024-07631-2","DOIUrl":null,"url":null,"abstract":"<div><p>Manganese (Mn) concentrations in many groundwater supplies exceed the national drinking water limit of 0.05 mg/L, exacerbating regional water scarcity and potential ecological issues. Adsorption, as an efficient process for wastewater treatment. For the adsorption process, the adsorbent was the key parameter. Manganese oxides have strong specific adsorption and catalytic oxidation capacity for Mn(II). Serpentine loading was an effective way to improve the dispersion of manganese oxides and the adsorption efficiency of heavy metals. This study aimed to remove dissolved Mn(II) from groundwater using a raw serpentine modified with manganese oxide (Srp/MO). SEM, EDS, XRD, BET and XPS were used to characterize the physicochemical properties and characteristic groups of the serpentine before and after loading. Response surface methodology (RSM) based on Box-Behnken method was used to design the experiment to optimize the effects of dosage, oscillation rate and reaction time on manganese removal. The results show that after modification, the pores of serpentine become larger, the surface becomes smooth and loose, the basic skeleton has no obvious change, the specific surface area increases, and the total pore volume decreases. The adsorption behavior of Mn(II) by Srp/MO follows Langmuir isotherm model and pseudo-second-order kinetic model. The maximum adsorption rate of Mn(II) in water by Srp/MO was 34.88 mg/g, which was 7.6 times that of the raw serpentine. The primary mechanism for Mn(II) removal by Srp/MO was based on physical adsorption and mediated by Mn<sup>3+</sup>/Mn<sup>4+</sup> species. The optimal manganese removal conditions were as follows: Srp/MO dosage 80 mg/L, oscillation rate 180 r/min, reaction time 104 min. At this time, the manganese removal rate was 99.3%, which was basically consistent with 100% predicted by the model. A regeneration study over three cycles indicated that Srp/MO possessed promising reusability potential. In conclusion, Srp/MO was an excellent adsorption material for the removal of Mn(II) in groundwater, which provides a new solution for the purification treatment of manganese containing groundwater.</p></div>","PeriodicalId":808,"journal":{"name":"Water, Air, & Soil Pollution","volume":"235 12","pages":""},"PeriodicalIF":3.8000,"publicationDate":"2024-11-18","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/s11270-024-07631-2","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
Manganese (Mn) concentrations in many groundwater supplies exceed the national drinking water limit of 0.05 mg/L, exacerbating regional water scarcity and potential ecological issues. Adsorption, as an efficient process for wastewater treatment. For the adsorption process, the adsorbent was the key parameter. Manganese oxides have strong specific adsorption and catalytic oxidation capacity for Mn(II). Serpentine loading was an effective way to improve the dispersion of manganese oxides and the adsorption efficiency of heavy metals. This study aimed to remove dissolved Mn(II) from groundwater using a raw serpentine modified with manganese oxide (Srp/MO). SEM, EDS, XRD, BET and XPS were used to characterize the physicochemical properties and characteristic groups of the serpentine before and after loading. Response surface methodology (RSM) based on Box-Behnken method was used to design the experiment to optimize the effects of dosage, oscillation rate and reaction time on manganese removal. The results show that after modification, the pores of serpentine become larger, the surface becomes smooth and loose, the basic skeleton has no obvious change, the specific surface area increases, and the total pore volume decreases. The adsorption behavior of Mn(II) by Srp/MO follows Langmuir isotherm model and pseudo-second-order kinetic model. The maximum adsorption rate of Mn(II) in water by Srp/MO was 34.88 mg/g, which was 7.6 times that of the raw serpentine. The primary mechanism for Mn(II) removal by Srp/MO was based on physical adsorption and mediated by Mn3+/Mn4+ species. The optimal manganese removal conditions were as follows: Srp/MO dosage 80 mg/L, oscillation rate 180 r/min, reaction time 104 min. At this time, the manganese removal rate was 99.3%, which was basically consistent with 100% predicted by the model. A regeneration study over three cycles indicated that Srp/MO possessed promising reusability potential. In conclusion, Srp/MO was an excellent adsorption material for the removal of Mn(II) in groundwater, which provides a new solution for the purification treatment of manganese containing groundwater.
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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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