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| Adsorption of Cd2+ by potassium ferrate/potassium permanganate-modified vinasse biochar |
| Received:September 24, 2020 |
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| KeyWord:vinasse biochar;K2FeO4;KMnO4;modification;Cd2+;adsorption |
| Author Name | Affiliation | E-mail | | JIANG Zi-yang | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | XU Min | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | WU Jun | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | wuj1962@163.com |
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| Abstract: |
| Vinasse biochar(BC) pyrolyzed at 600℃ was modified by K2FeO4(BCFE) or KMnO4(BCMN). The modified biochar was characterized by BET and SEM-EDS. The results showed that Mn-oxide and Fe-oxide were successfully loaded onto BCMN and BCFE, respectively. The total functional group content of BCFE was 1.8 times and 1.5 times higher than that of BC and BCMN, respectively. BCFE had more oxygen-containing functional groups and conjugated aromatic structures than the other biochars. The order of the specific surface area was BCFE(2 302.0 m2·g-1) >BCMN(521.3 m2·g-1) >BC(245.9 m2·g-1) (P<0.05), with the specific surface area of BCFE being 9.4 times and 4.4 times higher than that of BC and BCMN, respectively. The adsorption capacities of Cd2+ by BC, BCMN, and BCFE were 1.46, 5.61, and 7.46 mg·g-1, respectively, with significant differences among the three biochars(P<0.05). The adsorption kinetics of Cd2+ on BC, BCMN, and BCFE were described by the pseudo-second-order kinetic model. The adsorption rate of Cd by different biochars was in the order of BCFE>BCMN>BC. Isothermal adsorption of Cd2+ by BC, BCMN, and BCFE was described by the Langmuir isotherm, thereby indicating that the adsorption by biochar was single molecular layer adsorption. The order of the maximum adsorption capacity(Qm) was as follows:BCFE>BCMN>BC. The addition of K2FeO4/KMnO4 improved the structure of the biochar and increased the adsorption capacity of Cd, and the adsorption capacity of Cd by BCFE was higher than that of the BCMN. The results demonstrate that BCFE has an effective Cd removal ability from wastewater. |
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