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

GUO Zhi-wei; ZHAO Bao-long; ZHENG Zhi-hong; HONG Fei-yu; XIN Si-yuan; WANG Xiao-wei; WANG Xing-xiao; ZHANG Zhen-zhen; NIU Fang; LI Guo-ting

doi:10.13205/j.hjgc.202205007

Volume 40 Issue 5

Jul. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(5): 44-52

GUO Zhi-wei, ZHAO Bao-long, ZHENG Zhi-hong, HONG Fei-yu, XIN Si-yuan, WANG Xiao-wei, WANG Xing-xiao, ZHANG Zhen-zhen, NIU Fang, LI Guo-ting. PREPARATION OF MODIFIED DIATOMITE VIA CARBONIZATION AND ITS ADSORPTION PERFORMANCE ON TETRACYCLINE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 44-52. doi: 10.13205/j.hjgc.202205007

Citation:

GUO Zhi-wei, ZHAO Bao-long, ZHENG Zhi-hong, HONG Fei-yu, XIN Si-yuan, WANG Xiao-wei, WANG Xing-xiao, ZHANG Zhen-zhen, NIU Fang, LI Guo-ting. PREPARATION OF MODIFIED DIATOMITE VIA CARBONIZATION AND ITS ADSORPTION PERFORMANCE ON TETRACYCLINE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 44-52. doi: 10.13205/j.hjgc.202205007

Citation:

GUO Zhi-wei, ZHAO Bao-long, ZHENG Zhi-hong, HONG Fei-yu, XIN Si-yuan, WANG Xiao-wei, WANG Xing-xiao, ZHANG Zhen-zhen, NIU Fang, LI Guo-ting. PREPARATION OF MODIFIED DIATOMITE VIA CARBONIZATION AND ITS ADSORPTION PERFORMANCE ON TETRACYCLINE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 44-52. doi: 10.13205/j.hjgc.202205007

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

doi: 10.13205/j.hjgc.202205007

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

Received Date: 2021-03-19
Available Online: 2022-07-02

Abstract

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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References(37)

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