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| Effects of cation strength and species on adsorption of oxytetracycline by biochars |
| Received:October 01, 2017 |
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| KeyWord:oxytetracycline;pineapple peel waste;biochar;cation strength;cation species;adsorption |
| Author Name | Affiliation | E-mail | | YAN Cong-cong | College of Natural Resources and Environment, Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | FU Bo-min | College of Natural Resources and Environment, Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | LUO Ji-wei | College of Natural Resources and Environment, Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | HUANG Peng | College of Natural Resources and Environment, Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | GE Cheng-jun | College of Natural Resources and Environment, Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | YU Hua-mei | College of Natural Resources and Environment, Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | yuhuamei3007@163.com |
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| Abstract: |
| Based on OECD Guideline 106, batch sorption methods were used to investigate the effects of calcium ion strength(i.e. 0.01, 0.03, 0.05, 0.08, 0.1 mol Ca2+·L-1) and different cations(0.01 mol·L-1 solution of KCl, ZnCl2, CaCl2, AlCl3) on the oxytetracycline(OTC) adsorption process in pineapple residue biochars prepared at three temperatures(BL350, BL500, BL650). The results indicated that the values of the OTC adsorption coefficient lgKf gradually decreased with increasing Ca2+ concentration in solution until reaching steady state. A significantly negative correlation existed between calcium ion strength and lgKf value(P<0.05). The effects of Ca2+ concentration on the OTC adsorption by biochars were negligible at lower OTC concentrations compared to those at higher concentrations. Under the condition of different cations, both the Freundlich and Langmuir models were well-fitted isotherms for describing the OTC adsorption by biochars, with average fitting correlation coefficients of 0.922 1 and 0.946 3, respectively. Whereas the OTC adsorption isotherm of BL650 tended to be linear(with the value of 1/n close to 1) in 0.01 mol·L-1 AlCl3, other isotherms were L-type curves. Different effects of different cations on the OTC adsorption by the biochars were observed. In particular, whereas a significant difference existed between K+ and Al3+(P<0.05), more significant differences existed between Zn2+ and K+ or Al3+(P<0.01). Moreover, the presence of K+ significantly reduced the adsorption strength of OTC by biochar(1/n) as compared with the presence of other cations. |
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