Properties Analysis and Preparation of Biochar–Graphene Composites Under a One-Step Dip Coating Method in Water Treatment
In order to improve the adsorption efficiency of biochar in water treatment, biochar–graphene (BG) composites were prepared by the one-step dip coating method and applied to remove phthalates from water. Firstly, the materials and equipment needed for the experiment are introduced. The steps of prep...
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MDPI AG
2020-05-01
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| Online Access: | https://www.mdpi.com/2076-3417/10/11/3689 |
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| author | Ze Yu Wenxuan Wang He Gao Daxin Liang |
| author_facet | Ze Yu Wenxuan Wang He Gao Daxin Liang |
| author_sort | Ze Yu |
| collection | DOAJ |
| description | In order to improve the adsorption efficiency of biochar in water treatment, biochar–graphene (BG) composites were prepared by the one-step dip coating method and applied to remove phthalates from water. Firstly, the materials and equipment needed for the experiment are introduced. The steps of preparing graphene oxide (GO) by the improved Hummers method and BG composites by one-step dip coating are discussed. Then, the morphology characterization, adsorption performance measurement, and isothermal model of BG composites are introduced. Finally, the structure characterization, adsorption kinetics, and adsorption isotherms of BG composites are analyzed. The results show that the properties of biochar could be changed by one-step dip coating, and the biochar could form composites with graphene. Compared with biochar, biochar–graphene composites have greater surface area and porosity. When the pyrolysis temperature was 600 °C, the specific surface area of biochar was 8.4 m<sup>2</sup>g<sup>−1</sup>, and the specific surface area of the biochar–graphene composite was 221.3 m<sup>2</sup>g<sup>−1</sup>. When the temperature was 300 °C, the specific surface area of biochar was 11.01 m<sup>2</sup>g<sup>−1</sup>, and the specific surface area of biochar–graphene composite was 251.82 m<sup>2</sup>g<sup>−1</sup>. The formation of graphene on the surface of biochar can increase the stability of the composite and acts as a very high potential active site. The porous structure and surface properties of biochar–graphene composites regulate the adsorption rate of pollutant molecules, thereby improving the adsorption performance. When the adsorption equilibrium was reached, the adsorption effect of phthalate esters on the biochar/graphene composite at the pyrolysis temperature of 600 °C was the best, and the adsorption capacity of Dimethyl phthalate (DMP)was 35.2 mg/g, that of Diethyl phthalate (DEP) was 26.4 mg/g, and that of Dibutyl phthalate (DBP) was 25.1 mg/g. The adsorption effect of DMP was the best. The results of the isotherm study indicate that the adsorption of phthalates by BG composites has great potential, which provides a good theoretical basis for the application of BG composites in environmental protection in China. |
| first_indexed | 2024-03-10T19:34:25Z |
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| language | English |
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| spelling | doaj.art-24007bf3b49a4fc29e75ef8a93b427452023-11-20T01:49:25ZengMDPI AGApplied Sciences2076-34172020-05-011011368910.3390/app10113689Properties Analysis and Preparation of Biochar–Graphene Composites Under a One-Step Dip Coating Method in Water TreatmentZe Yu0Wenxuan Wang1He Gao2Daxin Liang3College of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, ChinaCollege of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, ChinaCollege of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, ChinaCollege of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, ChinaIn order to improve the adsorption efficiency of biochar in water treatment, biochar–graphene (BG) composites were prepared by the one-step dip coating method and applied to remove phthalates from water. Firstly, the materials and equipment needed for the experiment are introduced. The steps of preparing graphene oxide (GO) by the improved Hummers method and BG composites by one-step dip coating are discussed. Then, the morphology characterization, adsorption performance measurement, and isothermal model of BG composites are introduced. Finally, the structure characterization, adsorption kinetics, and adsorption isotherms of BG composites are analyzed. The results show that the properties of biochar could be changed by one-step dip coating, and the biochar could form composites with graphene. Compared with biochar, biochar–graphene composites have greater surface area and porosity. When the pyrolysis temperature was 600 °C, the specific surface area of biochar was 8.4 m<sup>2</sup>g<sup>−1</sup>, and the specific surface area of the biochar–graphene composite was 221.3 m<sup>2</sup>g<sup>−1</sup>. When the temperature was 300 °C, the specific surface area of biochar was 11.01 m<sup>2</sup>g<sup>−1</sup>, and the specific surface area of biochar–graphene composite was 251.82 m<sup>2</sup>g<sup>−1</sup>. The formation of graphene on the surface of biochar can increase the stability of the composite and acts as a very high potential active site. The porous structure and surface properties of biochar–graphene composites regulate the adsorption rate of pollutant molecules, thereby improving the adsorption performance. When the adsorption equilibrium was reached, the adsorption effect of phthalate esters on the biochar/graphene composite at the pyrolysis temperature of 600 °C was the best, and the adsorption capacity of Dimethyl phthalate (DMP)was 35.2 mg/g, that of Diethyl phthalate (DEP) was 26.4 mg/g, and that of Dibutyl phthalate (DBP) was 25.1 mg/g. The adsorption effect of DMP was the best. The results of the isotherm study indicate that the adsorption of phthalates by BG composites has great potential, which provides a good theoretical basis for the application of BG composites in environmental protection in China.https://www.mdpi.com/2076-3417/10/11/3689water treatmentone step dip coating methodcarbon-based materials–graphene compositesadsorption capacitythe isothermal model |
| spellingShingle | Ze Yu Wenxuan Wang He Gao Daxin Liang Properties Analysis and Preparation of Biochar–Graphene Composites Under a One-Step Dip Coating Method in Water Treatment Applied Sciences water treatment one step dip coating method carbon-based materials–graphene composites adsorption capacity the isothermal model |
| title | Properties Analysis and Preparation of Biochar–Graphene Composites Under a One-Step Dip Coating Method in Water Treatment |
| title_full | Properties Analysis and Preparation of Biochar–Graphene Composites Under a One-Step Dip Coating Method in Water Treatment |
| title_fullStr | Properties Analysis and Preparation of Biochar–Graphene Composites Under a One-Step Dip Coating Method in Water Treatment |
| title_full_unstemmed | Properties Analysis and Preparation of Biochar–Graphene Composites Under a One-Step Dip Coating Method in Water Treatment |
| title_short | Properties Analysis and Preparation of Biochar–Graphene Composites Under a One-Step Dip Coating Method in Water Treatment |
| title_sort | properties analysis and preparation of biochar graphene composites under a one step dip coating method in water treatment |
| topic | water treatment one step dip coating method carbon-based materials–graphene composites adsorption capacity the isothermal model |
| url | https://www.mdpi.com/2076-3417/10/11/3689 |
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