| 闫聪聪,符博敏,罗吉伟,黄鹏,葛成军,俞花美.阳离子强度及类型对生物质炭吸附土霉素的影响[J].农业环境科学学报,2018,37(4):718-724. |
| 阳离子强度及类型对生物质炭吸附土霉素的影响 |
| Effects of cation strength and species on adsorption of oxytetracycline by biochars |
| 投稿时间：2017-10-01 |
| DOI：10.11654/jaes.2017-1475 |
| 中文关键词: 土霉素 菠萝皮渣 生物质炭 阳离子强度 阳离子类型 吸附 |
| 英文关键词: oxytetracycline pineapple peel waste biochar cation strength cation species adsorption |
| 基金项目:国家自然科学基金项目（21467008，21367011，41763015）；海南省自然科学基金项目（413123）；海南省重大科技计划（ZDKJ2017002） |
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| 摘要点击次数: 2015 |
| 全文下载次数: 2008 |
| 中文摘要: |
| 以OECD Guideline 106为基础，采用批量平衡法研究不同Ca2+强度（0.01、0.03、0.05、0.08、0.1 mol·L-1）以及不同阳离子类型（0.01 mol·L-1 KCl、ZnCl2、CaCl2、AlCl3）对土霉素在3种菠萝皮渣生物质炭（BL350、BL500、BL650）中吸附的影响。结果表明，随着溶液中Ca2+浓度的增加，土霉素在生物质炭中的吸附参数lgKf逐渐减小趋于稳定，且lgKf值与CaCl2浓度之间呈显著负相关（P<0.05）。与此同时，Ca2+浓度的增加对低浓度土霉素溶液的吸附影响与高浓度时相比不明显。不同阳离子条件下，Freundlich和Langmuir模型均能较好地对吸附数据进行非线性拟合，平均R2分别是0.922 1、0.946 3。除了土霉素在BL650的AlCl3介质中1/n接近1，吸附趋于线性外，其他介质条件下的吸附等温线均呈"L"型。4种阳离子对土霉素在3种生物质炭中吸附行为的影响存在较大差异，具体表现为K+与Al3+之间存在显著差异（P<0.05），而Zn2+与K+、Al3+之间存在极显著差异（P<0.01）。与其他阳离子相比，K+的存在显著降低溶液中土霉素在生物质炭上的吸附强度（1/n）。 |
| 英文摘要: |
| 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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