Hydrophobic adsorbent prepared from spent methanol-to-propylene catalyst for directional adsorption of high COD oily wastewater
Abstract Spent methanol-to-propylene (MTP) catalysts have a large specific surface area and high porosity but are usually disposed of in landfills directly, and recycling has rarely been reported. In this study, the spent MTP catalyst was moderately dealuminized with organic acids and etched with al...
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| Format: | Article |
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Nature Portfolio
2022-03-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-022-07766-4 |
| _version_ | 1819236938315464704 |
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| author | Xiaojing Yong Hui Su Nana Zhao Zhengwei Jin Min Yao Yulong Ma |
| author_facet | Xiaojing Yong Hui Su Nana Zhao Zhengwei Jin Min Yao Yulong Ma |
| author_sort | Xiaojing Yong |
| collection | DOAJ |
| description | Abstract Spent methanol-to-propylene (MTP) catalysts have a large specific surface area and high porosity but are usually disposed of in landfills directly, and recycling has rarely been reported. In this study, the spent MTP catalyst was moderately dealuminized with organic acids and etched with alkali solvent to increase its specific surface area, further silanized by octyl triethoxy silane (OTS). A novel superhydrophobic adsorbent covered with –Si(CH2)7CH3 groups was obtained. The characterization of XRD, SEM, FTIR and XPS shows that the adsorbent maintains a typical ZSM-5 zeolite structure, and the –Si(CH2)7CH3 group is successfully grafted into the sample, not only on the surface but also in some pore space. Taking high chemical oxygen demand (COD) wastewater as the object, the influence of contract time, pH and temperature on COD removal was investigated. The removal process could be better depicted by the Langmuir isotherm model and the pseudo second-order dynamic model. Furthermore, the results of the thermodynamic study (∆G is − 79.35 kJ/mol, ∆S is 423.68 J/mol K, and ∆H is 46.91 kJ/mol) show that the adsorption was a spontaneous and endothermic process. These findings indicate that the modified spent MTP catalyst has potential application for the removal of COD from wastewater. |
| first_indexed | 2024-12-23T13:12:23Z |
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| id | doaj.art-f4b6d22dd61e485db1479fde7d7fc36b |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-23T13:12:23Z |
| publishDate | 2022-03-01 |
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| spelling | doaj.art-f4b6d22dd61e485db1479fde7d7fc36b2022-12-21T17:45:43ZengNature PortfolioScientific Reports2045-23222022-03-0112111110.1038/s41598-022-07766-4Hydrophobic adsorbent prepared from spent methanol-to-propylene catalyst for directional adsorption of high COD oily wastewaterXiaojing Yong0Hui Su1Nana Zhao2Zhengwei Jin3Min Yao4Yulong Ma5Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia UniversityInstitute of Coal Chemical Industry Technology, Ningxia Coal Industry Co., Ltd. of National Energy GroupInstitute of Coal Chemical Industry Technology, Ningxia Coal Industry Co., Ltd. of National Energy GroupInstitute of Coal Chemical Industry Technology, Ningxia Coal Industry Co., Ltd. of National Energy GroupKey Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia UniversityKey Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia UniversityAbstract Spent methanol-to-propylene (MTP) catalysts have a large specific surface area and high porosity but are usually disposed of in landfills directly, and recycling has rarely been reported. In this study, the spent MTP catalyst was moderately dealuminized with organic acids and etched with alkali solvent to increase its specific surface area, further silanized by octyl triethoxy silane (OTS). A novel superhydrophobic adsorbent covered with –Si(CH2)7CH3 groups was obtained. The characterization of XRD, SEM, FTIR and XPS shows that the adsorbent maintains a typical ZSM-5 zeolite structure, and the –Si(CH2)7CH3 group is successfully grafted into the sample, not only on the surface but also in some pore space. Taking high chemical oxygen demand (COD) wastewater as the object, the influence of contract time, pH and temperature on COD removal was investigated. The removal process could be better depicted by the Langmuir isotherm model and the pseudo second-order dynamic model. Furthermore, the results of the thermodynamic study (∆G is − 79.35 kJ/mol, ∆S is 423.68 J/mol K, and ∆H is 46.91 kJ/mol) show that the adsorption was a spontaneous and endothermic process. These findings indicate that the modified spent MTP catalyst has potential application for the removal of COD from wastewater.https://doi.org/10.1038/s41598-022-07766-4 |
| spellingShingle | Xiaojing Yong Hui Su Nana Zhao Zhengwei Jin Min Yao Yulong Ma Hydrophobic adsorbent prepared from spent methanol-to-propylene catalyst for directional adsorption of high COD oily wastewater Scientific Reports |
| title | Hydrophobic adsorbent prepared from spent methanol-to-propylene catalyst for directional adsorption of high COD oily wastewater |
| title_full | Hydrophobic adsorbent prepared from spent methanol-to-propylene catalyst for directional adsorption of high COD oily wastewater |
| title_fullStr | Hydrophobic adsorbent prepared from spent methanol-to-propylene catalyst for directional adsorption of high COD oily wastewater |
| title_full_unstemmed | Hydrophobic adsorbent prepared from spent methanol-to-propylene catalyst for directional adsorption of high COD oily wastewater |
| title_short | Hydrophobic adsorbent prepared from spent methanol-to-propylene catalyst for directional adsorption of high COD oily wastewater |
| title_sort | hydrophobic adsorbent prepared from spent methanol to propylene catalyst for directional adsorption of high cod oily wastewater |
| url | https://doi.org/10.1038/s41598-022-07766-4 |
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