Study on the adsorption properties of organically modified diatomite for methylene blue
Abstract Methylene blue (MB) dye is highly stable and non-degradable under natural conditions, posing significant threats to both ecosystems and human health. Conventional adsorbents, such as metal oxides, zeolites, bioadsorbents, and activated carbon, suffer from limited porosity, which restricts t...
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Nature Portfolio
2025-07-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-025-13768-9 |
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| author | Ziying Bu Ying Fang Hanjie Chen Mei Zhang Fulong Wang |
| author_facet | Ziying Bu Ying Fang Hanjie Chen Mei Zhang Fulong Wang |
| author_sort | Ziying Bu |
| collection | DOAJ |
| description | Abstract Methylene blue (MB) dye is highly stable and non-degradable under natural conditions, posing significant threats to both ecosystems and human health. Conventional adsorbents, such as metal oxides, zeolites, bioadsorbents, and activated carbon, suffer from limited porosity, which restricts their adsorption efficiency. Moreover, their high cost results in low economic viability. In this study, a novel eco-friendly crosslinked diatomite–chitosan/calcium alginate (DM-CS@CA) composite powder was synthesized using diatomite (DM), chitosan (CS), and sodium alginate (SA) as raw materials. The composite was prepared without the use of any chemical crosslinking agents, employing encapsulation techniques and drying processes. The adsorbent was characterized and analyzed using a range of techniques, including Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) surface area analysis, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and atomic force microscopy (AFM). Analysis of the experimental data revealed that the adsorption isotherm fits well with the Langmuir model, and the adsorption kinetics are consistent with the pseudo-second-order model. Under optimal conditions of pH 8, temperature 25 °C, and an adsorbent dosage of 1 g/L, the maximum adsorption capacity reached 549.74 mg/g. |
| format | Article |
| id | doaj-art-710d8a293a9d49b384febed8473c822a |
| institution | DOAJ |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-710d8a293a9d49b384febed8473c822a2025-08-20T03:04:39ZengNature PortfolioScientific Reports2045-23222025-07-0115111210.1038/s41598-025-13768-9Study on the adsorption properties of organically modified diatomite for methylene blueZiying Bu0Ying Fang1Hanjie Chen2Mei Zhang3Fulong Wang4College of Materials Science and Engineering, Nanjing Tech UniversityCollege of Materials Science and Engineering, Nanjing Tech UniversityCollege of Materials Science and Engineering, Nanjing Tech UniversityCollege of Materials Science and Engineering, Nanjing Tech UniversityCollege of Materials Science and Engineering, Nanjing Tech UniversityAbstract Methylene blue (MB) dye is highly stable and non-degradable under natural conditions, posing significant threats to both ecosystems and human health. Conventional adsorbents, such as metal oxides, zeolites, bioadsorbents, and activated carbon, suffer from limited porosity, which restricts their adsorption efficiency. Moreover, their high cost results in low economic viability. In this study, a novel eco-friendly crosslinked diatomite–chitosan/calcium alginate (DM-CS@CA) composite powder was synthesized using diatomite (DM), chitosan (CS), and sodium alginate (SA) as raw materials. The composite was prepared without the use of any chemical crosslinking agents, employing encapsulation techniques and drying processes. The adsorbent was characterized and analyzed using a range of techniques, including Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) surface area analysis, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and atomic force microscopy (AFM). Analysis of the experimental data revealed that the adsorption isotherm fits well with the Langmuir model, and the adsorption kinetics are consistent with the pseudo-second-order model. Under optimal conditions of pH 8, temperature 25 °C, and an adsorbent dosage of 1 g/L, the maximum adsorption capacity reached 549.74 mg/g.https://doi.org/10.1038/s41598-025-13768-9DiatomiteChitosanSodium alginateAdsorptionMethylene blue |
| spellingShingle | Ziying Bu Ying Fang Hanjie Chen Mei Zhang Fulong Wang Study on the adsorption properties of organically modified diatomite for methylene blue Scientific Reports Diatomite Chitosan Sodium alginate Adsorption Methylene blue |
| title | Study on the adsorption properties of organically modified diatomite for methylene blue |
| title_full | Study on the adsorption properties of organically modified diatomite for methylene blue |
| title_fullStr | Study on the adsorption properties of organically modified diatomite for methylene blue |
| title_full_unstemmed | Study on the adsorption properties of organically modified diatomite for methylene blue |
| title_short | Study on the adsorption properties of organically modified diatomite for methylene blue |
| title_sort | study on the adsorption properties of organically modified diatomite for methylene blue |
| topic | Diatomite Chitosan Sodium alginate Adsorption Methylene blue |
| url | https://doi.org/10.1038/s41598-025-13768-9 |
| work_keys_str_mv | AT ziyingbu studyontheadsorptionpropertiesoforganicallymodifieddiatomiteformethyleneblue AT yingfang studyontheadsorptionpropertiesoforganicallymodifieddiatomiteformethyleneblue AT hanjiechen studyontheadsorptionpropertiesoforganicallymodifieddiatomiteformethyleneblue AT meizhang studyontheadsorptionpropertiesoforganicallymodifieddiatomiteformethyleneblue AT fulongwang studyontheadsorptionpropertiesoforganicallymodifieddiatomiteformethyleneblue |