Does soluble starch improve the removal of Cr(VI) by nZVI loaded on biochar?
A novel material that nano zero valent iron (nZVI) loaded on biochar with stable starch stabilization (nZVI/SS/BC) was synthesized and used for the removal of hexavalent chromium [Cr(VI)] in simulated wastewater. It was indicated that as the pyrolysis temperature of rice straw increased, the removal...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-01-01
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| Series: | Ecotoxicology and Environmental Safety |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0147651320313890 |
| _version_ | 1818899183394881536 |
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| author | Chun Yang Chazhong Ge Xiaoliang Li Lu Li Bin Wang Aijun Lin Wenjie Yang |
| author_facet | Chun Yang Chazhong Ge Xiaoliang Li Lu Li Bin Wang Aijun Lin Wenjie Yang |
| author_sort | Chun Yang |
| collection | DOAJ |
| description | A novel material that nano zero valent iron (nZVI) loaded on biochar with stable starch stabilization (nZVI/SS/BC) was synthesized and used for the removal of hexavalent chromium [Cr(VI)] in simulated wastewater. It was indicated that as the pyrolysis temperature of rice straw increased, the removal rate of Cr(VI) by nZVI/SS/BC first increased and then decreased. nZVI/SS/BC made from biochar pyrolyzed at 600 °C (nZVI/SS/BC600) had the highest removal efficiency and was suitable for a wide pH range (pH 2.1–10.0). The results showed that 99.67% of Cr(VI) was removed by nZVI/SS/BC600, an increase of 45.93% compared to the control group, which did not add soluble starch during synthesis. The pseudo-second-order model and the Langmuir model were more in line with reaction. The maximum adsorption capacity for Cr(VI) by nZVI/SS/BC600 was 122.86 mg·g−1. The properties of the material were analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) mapping, Brunauer-Emmett-Teller (BET), Fourier-transform infrared (FTIR), and X-ray diffraction (XRD). The results showed that the nZVI particles were uniformly supported on the biochar, and the BET surface areas of nZVI/SS/BC was 40.4837 m2·g−1, an increase of 8.79 times compared with the control group. Mechanism studies showed that soluble starch reduced the formation of metal oxides, thereby improving the reducibility of the material, and co-precipitates were formed during the reaction. All results indicated that nZVI/SS/BC was a potential repair material that can effectively overcome the limitations of nZVI and achieve efficient and rapid repair of Cr(VI). |
| first_indexed | 2024-12-19T19:43:55Z |
| format | Article |
| id | doaj.art-b36188cc164449f68b4a2dafeb85019a |
| institution | Directory Open Access Journal |
| issn | 0147-6513 |
| language | English |
| last_indexed | 2024-12-19T19:43:55Z |
| publishDate | 2021-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecotoxicology and Environmental Safety |
| spelling | doaj.art-b36188cc164449f68b4a2dafeb85019a2022-12-21T20:08:12ZengElsevierEcotoxicology and Environmental Safety0147-65132021-01-01208111552Does soluble starch improve the removal of Cr(VI) by nZVI loaded on biochar?Chun Yang0Chazhong Ge1Xiaoliang Li2Lu Li3Bin Wang4Aijun Lin5Wenjie Yang6Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaChinese Academy for Environmental Planning, Beijing 100012, ChinaChinese Academy for Environmental Planning, Beijing 100012, ChinaChinese Academy for Environmental Planning, Beijing 100012, ChinaQinhuangdao Bohai Biological Research Institute of Beijing University of Chemical Technology, Qinhuangdao, Hebei 066000, ChinaDepartment of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China; Qinhuangdao Bohai Biological Research Institute of Beijing University of Chemical Technology, Qinhuangdao, Hebei 066000, China; Corresponding author at: Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.Chinese Academy for Environmental Planning, Beijing 100012, China; College of Renewable Energy, North China Electric Power University, Beijing 102206, China; Corresponding author at: Chinese Academy for Environmental Planning, Beijing 100012, China.A novel material that nano zero valent iron (nZVI) loaded on biochar with stable starch stabilization (nZVI/SS/BC) was synthesized and used for the removal of hexavalent chromium [Cr(VI)] in simulated wastewater. It was indicated that as the pyrolysis temperature of rice straw increased, the removal rate of Cr(VI) by nZVI/SS/BC first increased and then decreased. nZVI/SS/BC made from biochar pyrolyzed at 600 °C (nZVI/SS/BC600) had the highest removal efficiency and was suitable for a wide pH range (pH 2.1–10.0). The results showed that 99.67% of Cr(VI) was removed by nZVI/SS/BC600, an increase of 45.93% compared to the control group, which did not add soluble starch during synthesis. The pseudo-second-order model and the Langmuir model were more in line with reaction. The maximum adsorption capacity for Cr(VI) by nZVI/SS/BC600 was 122.86 mg·g−1. The properties of the material were analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) mapping, Brunauer-Emmett-Teller (BET), Fourier-transform infrared (FTIR), and X-ray diffraction (XRD). The results showed that the nZVI particles were uniformly supported on the biochar, and the BET surface areas of nZVI/SS/BC was 40.4837 m2·g−1, an increase of 8.79 times compared with the control group. Mechanism studies showed that soluble starch reduced the formation of metal oxides, thereby improving the reducibility of the material, and co-precipitates were formed during the reaction. All results indicated that nZVI/SS/BC was a potential repair material that can effectively overcome the limitations of nZVI and achieve efficient and rapid repair of Cr(VI).http://www.sciencedirect.com/science/article/pii/S0147651320313890Soluble starchReductionAdsorptionCoprecipitationHexavalent chromium |
| spellingShingle | Chun Yang Chazhong Ge Xiaoliang Li Lu Li Bin Wang Aijun Lin Wenjie Yang Does soluble starch improve the removal of Cr(VI) by nZVI loaded on biochar? Ecotoxicology and Environmental Safety Soluble starch Reduction Adsorption Coprecipitation Hexavalent chromium |
| title | Does soluble starch improve the removal of Cr(VI) by nZVI loaded on biochar? |
| title_full | Does soluble starch improve the removal of Cr(VI) by nZVI loaded on biochar? |
| title_fullStr | Does soluble starch improve the removal of Cr(VI) by nZVI loaded on biochar? |
| title_full_unstemmed | Does soluble starch improve the removal of Cr(VI) by nZVI loaded on biochar? |
| title_short | Does soluble starch improve the removal of Cr(VI) by nZVI loaded on biochar? |
| title_sort | does soluble starch improve the removal of cr vi by nzvi loaded on biochar |
| topic | Soluble starch Reduction Adsorption Coprecipitation Hexavalent chromium |
| url | http://www.sciencedirect.com/science/article/pii/S0147651320313890 |
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