Cd(II) removal from aqueous solutions by pomelo peel derived biochar in a permeable reactive barrier: modelling, optimization and mechanism
Biochar can have multiple benefits, such as solid waste recycling, water pollution treatment, carbon fixation and sustainability, and it is green, friendly, inexpensive and highly efficient. Therefore, the present study aimed to investigate Cd(II) removal from aqueous solutions using pomelo peel der...
| Auteurs principaux: | , , , |
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| Format: | Article |
| Langue: | English |
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IOP Publishing
2021-01-01
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| Collection: | Materials Research Express |
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| Accès en ligne: | https://doi.org/10.1088/2053-1591/ac386b |
| _version_ | 1827869216772980736 |
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| author | Gang Xiang Shengxing Long Huijuan Liu Xianliang Wu |
| author_facet | Gang Xiang Shengxing Long Huijuan Liu Xianliang Wu |
| author_sort | Gang Xiang |
| collection | DOAJ |
| description | Biochar can have multiple benefits, such as solid waste recycling, water pollution treatment, carbon fixation and sustainability, and it is green, friendly, inexpensive and highly efficient. Therefore, the present study aimed to investigate Cd(II) removal from aqueous solutions using pomelo peel derived biochar combined with a permeable reactive barrier (PRB). Meanwhile, the materials were characterized using SEM, FIIR, XRD, N _2 adsorption, Zeta potential, TGA and XPS. The removal conditions were optimized by a response surface methodology (RSM) and a back propagation combined with genetic algorithm (BP-GA). The results show that there were slight changes in the structure of the pomelo peel derived biochar before and after activation, while the variation was not significant. The specific surface areas of the not activated and activated pomelo peel derived biochars were 3.207 m ^2 g ^−1 and 6.855 m ^2 g ^−1 , respectively. The pore diameter of the former was 4.165 nm and that of the latter was 4.425 nm, indicating that the two materials are mainly mesoporous. BP-GA is more suitable than RSM for optimizing the removal conditions of Cd(II) using the prepared materials combined with PRB. The maximum removal efficiency of Cd(II) was 90.31% at biochar dosage = 4.84, reaction time = 53.75 min, initial Cd(II) concentration = 19.36 mg l ^−1 and initial pH = 6.07. The verification experiment was 88.74% under these experimental conditions, and the absolute error was 1.57%. The saturated adsorption capacity of quartz sand for Cd(II) is approximately 0.08 mg g ^−1 when reaching equilibrium. The saturated adsorption capacity of biochar for Cd(II) is approximately 29.76 mg g ^−1 . Pseudo second order kinetics and Langmuir isotherm adsorption were more suitable for describing the Cd(II) adsorbed from an aqueous solution by activated pomelo peel derived biochar. The adsorption process of Cd(II) by the prepared biochar was spontaneous, endothermic and entropy driven. Our results suggest that the modified pomelo peel derived biochar can be regenerated within the fourth cycle and that it has application prospects as a useful adsorbent for water treatment in PRB systems. This finding provides a reference for relieving Cd pollution and for its large scale removal from wastewater when combined with a PRB system. |
| first_indexed | 2024-03-12T15:42:34Z |
| format | Article |
| id | doaj.art-e044bfb51e11465a8b1c76ce6d745f0b |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:42:34Z |
| publishDate | 2021-01-01 |
| publisher | IOP Publishing |
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| spelling | doaj.art-e044bfb51e11465a8b1c76ce6d745f0b2023-08-09T15:55:45ZengIOP PublishingMaterials Research Express2053-15912021-01-0181111550810.1088/2053-1591/ac386bCd(II) removal from aqueous solutions by pomelo peel derived biochar in a permeable reactive barrier: modelling, optimization and mechanismGang Xiang0Shengxing Long1Huijuan Liu2https://orcid.org/0000-0003-4643-8908Xianliang Wu3https://orcid.org/0000-0002-1506-0431Guizhou Normal University , School of Geography and Environmental Science, Guiyang 550001, People’s Republic of ChinaGuizhou Normal University , School of Geography and Environmental Science, Guiyang 550001, People’s Republic of China; College of Urban and Environmental Sciences, Peking University, Beijing 100871, People’s Republic of ChinaKey Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, Guizhou 550025, People’s Republic of ChinaGuizhou Institute of Biology, Guiyang, Guizhou 550009, People’s Republic of ChinaBiochar can have multiple benefits, such as solid waste recycling, water pollution treatment, carbon fixation and sustainability, and it is green, friendly, inexpensive and highly efficient. Therefore, the present study aimed to investigate Cd(II) removal from aqueous solutions using pomelo peel derived biochar combined with a permeable reactive barrier (PRB). Meanwhile, the materials were characterized using SEM, FIIR, XRD, N _2 adsorption, Zeta potential, TGA and XPS. The removal conditions were optimized by a response surface methodology (RSM) and a back propagation combined with genetic algorithm (BP-GA). The results show that there were slight changes in the structure of the pomelo peel derived biochar before and after activation, while the variation was not significant. The specific surface areas of the not activated and activated pomelo peel derived biochars were 3.207 m ^2 g ^−1 and 6.855 m ^2 g ^−1 , respectively. The pore diameter of the former was 4.165 nm and that of the latter was 4.425 nm, indicating that the two materials are mainly mesoporous. BP-GA is more suitable than RSM for optimizing the removal conditions of Cd(II) using the prepared materials combined with PRB. The maximum removal efficiency of Cd(II) was 90.31% at biochar dosage = 4.84, reaction time = 53.75 min, initial Cd(II) concentration = 19.36 mg l ^−1 and initial pH = 6.07. The verification experiment was 88.74% under these experimental conditions, and the absolute error was 1.57%. The saturated adsorption capacity of quartz sand for Cd(II) is approximately 0.08 mg g ^−1 when reaching equilibrium. The saturated adsorption capacity of biochar for Cd(II) is approximately 29.76 mg g ^−1 . Pseudo second order kinetics and Langmuir isotherm adsorption were more suitable for describing the Cd(II) adsorbed from an aqueous solution by activated pomelo peel derived biochar. The adsorption process of Cd(II) by the prepared biochar was spontaneous, endothermic and entropy driven. Our results suggest that the modified pomelo peel derived biochar can be regenerated within the fourth cycle and that it has application prospects as a useful adsorbent for water treatment in PRB systems. This finding provides a reference for relieving Cd pollution and for its large scale removal from wastewater when combined with a PRB system.https://doi.org/10.1088/2053-1591/ac386bCd(II)pomelo peel derived biocharpermeable reactive barrierresponse surface methodologyback propagation combined with genetic algorithm |
| spellingShingle | Gang Xiang Shengxing Long Huijuan Liu Xianliang Wu Cd(II) removal from aqueous solutions by pomelo peel derived biochar in a permeable reactive barrier: modelling, optimization and mechanism Materials Research Express Cd(II) pomelo peel derived biochar permeable reactive barrier response surface methodology back propagation combined with genetic algorithm |
| title | Cd(II) removal from aqueous solutions by pomelo peel derived biochar in a permeable reactive barrier: modelling, optimization and mechanism |
| title_full | Cd(II) removal from aqueous solutions by pomelo peel derived biochar in a permeable reactive barrier: modelling, optimization and mechanism |
| title_fullStr | Cd(II) removal from aqueous solutions by pomelo peel derived biochar in a permeable reactive barrier: modelling, optimization and mechanism |
| title_full_unstemmed | Cd(II) removal from aqueous solutions by pomelo peel derived biochar in a permeable reactive barrier: modelling, optimization and mechanism |
| title_short | Cd(II) removal from aqueous solutions by pomelo peel derived biochar in a permeable reactive barrier: modelling, optimization and mechanism |
| title_sort | cd ii removal from aqueous solutions by pomelo peel derived biochar in a permeable reactive barrier modelling optimization and mechanism |
| topic | Cd(II) pomelo peel derived biochar permeable reactive barrier response surface methodology back propagation combined with genetic algorithm |
| url | https://doi.org/10.1088/2053-1591/ac386b |
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