In this study, lanthanum modified zeolite (La-Z) was used to adsorb chlortetracycline (CTC) from aquaculture wastewater. La-Z was characterized by SEM, TEM, EDS, XRD, FTIR and BET. The effects various factors on the adsorption of CTC by La-Z were investigated, including the lanthanum modification concentration on zeolites, the dosage of La-Z, solution pH and reaction time. Orthogonal experiments were performed to determine the optimal adsorption conditions. Adsorption kinetics were studied by quasi-first-order model, quasi-second-order model, Weber-Morris, Boyd and Bangham models, while isotherms were analyzed by the Langmuir and Freundlich models. The removal rate reached 98.4%, when the modified concentration was 0.02 mol/L, the adsorbent dosage was 0.04 g, the initial concentration of CTC was 5 mg/L, the adsorption time was 20 min, and the pH was 7. The initial CTC concentration had the greatest influence on the adsorption process. The kinetic results showed a significant linear correlation between the experimental results and the quasi-second-order kinetic model. From the results of the internal diffusion model, it was found that the La-Z adsorption rate was controlled by both internal diffusion and external diffusion, in a multi-step process. The adsorption isotherm conforms to the Langmuir model, with the maximum adsorption quantity reaching 127.55 mg/g. Thermodynamic analysis showed that the adsorption process was an endothermic process of entropy increase, which occurs spontaneously.

中文翻译：

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使用改性沸石从水产养殖废水中吸附金霉素。

在这项研究中，镧改性沸石（La-Z）用于从水产养殖废水中吸附金霉素（CTC）。La-Z用SEM，TEM，EDS，XRD，FTIR和BET表征。研究了镧对沸石分子筛的镧改性浓度，镧-锌的用量，溶液的pH值和反应时间等因素对La-Z吸附四氯化碳的影响。进行正交实验以确定最佳吸附条件。用准一阶模型，准二阶模型，Weber-Morris，Boyd和Bangham模型研究吸附动力学，而等温线则用Langmuir和Freundlich模型分析。去除率达到98.4％，改性浓度为0.02 mol / L，吸附剂量为0.04 g，四氯化碳起始浓度为5 mg / L，吸附时间为20 min，pH值为7。初始CTC浓度对吸附过程的影响最大。动力学结果表明实验结果与准二级动力学模型之间存在显着的线性相关性。从内部扩散模型的结果，发现在一个多步骤过程中，La-Z吸附速率既受内部扩散又受外部扩散控制。吸附等温线符合Langmuir模型，最大吸附量达到127.55 mg / g。热力学分析表明，吸附过程是熵增加的吸热过程，是自发发生的。动力学结果表明实验结果与准二级动力学模型之间存在显着的线性相关性。根据内部扩散模型的结果，发现在一个多步骤过程中，La-Z吸附速率受内部扩散和外部扩散控制。吸附等温线符合Langmuir模型，最大吸附量达到127.55 mg / g。热力学分析表明，吸附过程是熵增加的吸热过程，是自发发生的。动力学结果表明实验结果与准二级动力学模型之间存在显着的线性相关性。从内部扩散模型的结果，发现在一个多步骤过程中，La-Z吸附速率既受内部扩散又受外部扩散控制。吸附等温线符合Langmuir模型，最大吸附量达到127.55 mg / g。热力学分析表明，吸附过程是熵增加的吸热过程，是自发发生的。最大吸附量达到127.55 mg / g。热力学分析表明，吸附过程是自发发生的熵增加的吸热过程。最大吸附量达到127.55 mg / g。热力学分析表明，吸附过程是自发发生的熵增加的吸热过程。