碳化改性硅藻土对四环素的吸附

郭志伟; 赵宝龙; 郑志宏; 洪飞宇; 辛思远; 王晓伟; 王兴肖; 张珍珍; 牛芳; 李国亭

doi:10.13205/j.hjgc.202205007

碳化改性硅藻土对四环素的吸附

doi: 10.13205/j.hjgc.202205007

1. 河南城市建筑咨询有限公司, 郑州 450000;
2. 华北水利水电大学环境与市政工程学院, 郑州 450046;
3. 中国二冶集团有限公司河南工程设计分公司, 郑州 450000;
4. 中国铁路经济规划研究院有限公司, 北京 100081;
5. 中国铁道科学研究院集团有限公司节能环保劳卫研究所, 北京 100081;
6. 城发环保能源有限公司, 郑州 450000

基金项目:

河南省重大科技专项项目“河南省典型村镇生活污水处理技术集成与示范”(161100310700)

详细信息

作者简介:
郭志伟(1979-),高级工程师,主要研究方向为水资源利用。951970997@qq.com

通讯作者:
赵宝龙(1996-),男。zbl_17@126.com

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出版历程
- 收稿日期: 2021-03-19
- 网络出版日期: 2022-07-02

PREPARATION OF MODIFIED DIATOMITE VIA CARBONIZATION AND ITS ADSORPTION PERFORMANCE ON TETRACYCLINE

1. Henan Urban Architecture Consulting Ltd., Zhengzhou 450000, China;
2. Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, China;
3. Henan Engineering Design Branch of China Second Metallurgical Group Co., Ltd., Zhengzhou 450000, China;
4. China Railway Economic and Planning Research Institute, Beijing 100081, China;
5. Energy Saving and Environmental Protection and Occupational Safety and Health Research Institute, China Academy of Railway Sciences Co., Ltd., Beijing 100081, China;
6. City Environment Clean Energy Co., Ltd., Zhengzhou 450000, China

摘要

摘要: 为提高天然硅藻土对水体中有机污染物的吸附去除性能,以葡萄糖为碳源,通过一步低温热解法对天然硅藻土进行碳化改性。利用扫描电镜(SEM/EDX)、傅里叶红外光谱(FTIR)、X射线衍射(XRD)、Zeta电位等技术表征了碳化改性的硅藻土(CD₃₀₀)的结构特点和化学性质,并以四环素(TC)为目标污染物,对CD₃₀₀吸附TC的吸附动力学、吸附等温线和热力学进行研究分析。结果表明:在300℃下CD₃₀₀对TC的吸附效果最佳,较天然硅藻土的吸附性能提高了110.6%。表征结果证实了碳化产物成功负载至天然硅藻土表面且改性不会明显影响天然硅藻土的形貌结构。Elovich动力学模型表明,CD₃₀₀吸附TC以化学吸附为主。颗粒内扩散模型显示,CD₃₀₀对TC的吸附由液膜扩散和内扩散2个阶段控制,而内扩散阶段为主要的速率控制步骤。吸附等温线分析显示,Freundlich模型拟合效果更好(R²>0.966),表明吸附为多分子层吸附过程。热力学参数ΔG⁰<0、ΔH⁰>0和ΔS⁰>0,说明吸附过程为自发、吸热且混乱度增加。溶液初始pH值和离子影响强度实验证明,TC分子与CD₃₀₀间可能存在较强的外层结合,而静电作用在吸附过程中占据了主导作用。此外,碳化改性的硅藻土拥有良好的再生性能,表明其可作为一种高效吸附剂用于有机污染物的吸附去除。
- 碳化改性 /
- 硅藻土 /
- 四环素 /
- 吸附动力学 /
- 吸附等温线
Abstract: To enhance the adsorption performance of the raw diatomite for organic pollutants in water, the modified diatomite(CD₃₀₀) was simply synthesized, using glucose as a carbon source, by low-temperature pyrolysis of glucose-immersed diatomite. CD₃₀₀ was characterized by SEM, EDX, FTIR, XRD, and Zeta potential, respectively. The adsorption kinetics, adsorption isotherms and adsorption thermodynamics of tetracycline(TC) as target pollutant were studied. It was observed that the modified adsorbents pyrolyzed at 300℃ performed better than other adsorbents for the TC adsorption, 110.6% higher than that of the raw diatomite. The characterization revealed that the carbonization products were successfully deposited on the surface of diatomite, and the morphology and structure of the raw diatomite were not significantly changed by carbonization modification. Based on correlation coefficient R², Elovich kinetic model was better to fit the experiment results(R²>0.941), indicating that the adsorption on CD₃₀₀ was mainly chemisorption. Intra-particle diffusion model showed that the adsorption process was controlled by liquid film diffusion and internal diffusion, and the internal diffusion phase was the main rate control step. The adsorption isotherm analysis showed that the Freundlich model fitted the experimental data better(R²>0.966), indicating that the adsorption was multi-layer adsorption. The thermodynamic parameters, ΔG⁰<0, ΔH⁰>0 and ΔS⁰>0, indicated that the adsorption process was spontaneous, endothermic and the increase of disorder degree. The influence experiments of initial solution pH and ionic strength proved that there might be a strong outer-sphere association between TC molecules and CD₃₀₀, and electrostatic interaction was a dominant role in adsorption process. In addition, the favorable regeneration performance of CD₃₀₀ indicated that it could be used as an efficient adsorbent for organic pollutants adsorption removal.
- carbonization modification /
- diatomite /
- tetracycline /
- adsorption kinetics /
- adsorption isotherms

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