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首页> 外文期刊>Journal of Environmental Health Science and Engineering >Removal of tetracycline from wastewater using pumice stone: equilibrium, kinetic and thermodynamic studies
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Removal of tetracycline from wastewater using pumice stone: equilibrium, kinetic and thermodynamic studies

机译：用浮石去除废水中的四环素：平衡，动力学和热力学研究

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In this study, pumice stone was used for the removal of tetracyline (TC) from aqueous solutions. It was characterized by XRD, FT-IR, SEM and BET analyses. Cation exchange capacity of pumice stone was found to be 9.9 meq/100 g. Effect of various parameters such as solution pH (2–11), adsorbent dosage (0.5-10 g/L), contact time (2.5-120 min), initial TC concentration (5–300 mg/L) and temperature (20–50°C) on TC adsorption onto pumice was investigated. Also the adsorption of TC on pumice stone was studied as a function of Na+ and Cu2+ cations changing pH from 2 to 11 using batch experiments. The best removal efficiency performance was exhibited at adsorbent dosage 10 g/L, pH 3, contact time 120 min. Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models were applied to the equilibrium data. The result has shown that the adsorption was favorable, physicochemical in nature and agrees well with Langmuir and Freundlich models. The maximum Langmuir adsorption capacity was found to be 20.02 mg/g. The adsorption behavior of TC on pumices stone was fitted well in the pseudo-second order kinetics model. Thermodynamic parameters calculated from the adsorption data at different temperature showed that the adsorption reaction was feasible, spontaneous and exothermic.
机译：在这项研究中，浮石用于从水溶液中去除四环素（TC）。通过XRD，FT-IR，SEM和BET分析对其进行表征。发现浮石的阳离子交换容量为9.9meq / 100g。各种参数的影响，例如溶液的pH值（2-11），吸附剂剂量（0.5-10 g / L），接触时间（2.5-120分钟），初始TC浓度（5-300 mg / L）和温度（20-研究了TC在50℃下对浮石的吸附情况。还使用分批实验研究了TC在浮石上的吸附与Na +和Cu2 +阳离子将pH从2改变为11的关系。在吸附剂量10 g / L，pH 3，接触时间120分钟时表现出最佳的去除效率性能。将Langmuir，Freundlich和Dubinin-Radushkevich（D-R）等温线模型应用于平衡数据。结果表明，该吸附具有良好的物理化学性质，与Langmuir和Freundlich模型吻合良好。发现最大的朗缪尔吸附容量为20.02mg / g。伪二阶动力学模型很好地拟合了TC在浮石上的吸附行为。从不同温度下的吸附数据计算出的热力学参数表明，该吸附反应是可行的，自发的，放热的。

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