Research on adsorption of TC and copper ions by ZIF-8/CMC hybrid foam

LI Wei; GUO Mengya; LIU Ning; LIU Shui

doi:10.13205/j.hjgc.202504018

Volume 43 Issue 4

Apr. 2025

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LI W，GUO M Y，LIU N，et al.Research on adsorption of TC and copper ions by ZIF-8/CMC hybrid foam［J］.Environmental Engineering，2025，43（4）：182-193. doi: 10.13205/j.hjgc.202504018

Citation:

LI W，GUO M Y，LIU N，et al.Research on adsorption of TC and copper ions by ZIF-8/CMC hybrid foam［J］.Environmental Engineering，2025，43（4）：182-193. doi: 10.13205/j.hjgc.202504018

Citation:

LI W，GUO M Y，LIU N，et al.Research on adsorption of TC and copper ions by ZIF-8/CMC hybrid foam［J］.Environmental Engineering，2025，43（4）：182-193. doi: 10.13205/j.hjgc.202504018

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Research on adsorption of TC and copper ions by ZIF-8/CMC hybrid foam

doi: 10.13205/j.hjgc.202504018

LI Wei^{1
,
,},
GUO Mengya¹,
LIU Ning²,
LIU Shui³

1. School of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang 110168, China;
2. Shenyang Country Garden Real Estate Development Co., Ltd., Shenyang 110003, China;
3. Foshan Water and Environmental Protection Co., Ltd., Foshan 518000, China

Received Date: 2023-05-09
Accepted Date: 2023-08-16
Rev Recd Date: 2023-07-13
Publish Date: 2025-04-01

Abstract

Abstract

To improve the stability of metal-organic framework （MOF） materials for the adsorption of organic compounds and heavy metal mixed pollutants， this study applied the ice-templating and freeze-drying method to prepare a hybrid foam of ZIF-8/CMC， with carboxymethyl cellulose （CMC） acting as the crosslinking agent. The structural and functional properties of ZIF-8/CMC were thoroughly characterized using advanced analytical techniques， including scanning electron microscopy （SEM）， X-ray diffraction （XRD）， nitrogen adsorption-desorption tests， and thermogravimetric analysis （TG）. Additionally， the adsorption performance， adsorption mechanisms， and recycling stability of ZIF-8/CMC for tetracycline （TC） and Cu²⁺ were systematically investigated. The results demonstrated that CMC was successfully loaded into the channels of ZIF-8， forming an irregular three-dimensional structure that significantly enhanced the material's adsorption capacity for pollutants and the recycling performance. The optimal adsorption conditions for ZIF-8/CMC were determined as follows： an adsorption time of 16 hours， an initial pollutant concentration of 30 mg/L，a pH value of 6， and an adsorbent dosage of 50 mg. Under these conditions， the adsorption capacities of ZIF-8/CMC for TC and Cu²⁺ reached remarkable levels of 78.75 mg/g and 79.71 mg/g， respectively. The adsorption isotherm process of ZIF-8/CMC was found to comply well with the Langmuir model， indicating monolayer adsorption on a homogeneous surface. Furthermore， thermodynamic studies revealed that the adsorption of TC and Cu²⁺ by ZIF-8/CMC was a spontaneous， exothermic， and orderly process， suggesting a thermodynamically favorable and orderly adsorption mechanism.In terms of reusability， ZIF-8/CMC exhibited excellent cyclic stability， maintaining a removal rate of 75% above for both TC and Cu²⁺ even after five consecutive adsorption cycles. This highlights the material's robust performance and potential for repeated use in practical applications. The ZIF-8/CMC adsorbent demonstrated high selective adsorption performance for TC and Cu²⁺， along with exceptional reusability in cyclic adsorption processes. These properties make it a highly promising candidate for the treatment of pharmaceutical wastewater， where the removal of organic pollutants and heavy metals is critical. Moreover， the unique structural and functional characteristics of ZIF-8/CMC suggest its potential for broader environmental applications， such as the remediation of industrial effluents containing complex pollutants mixtures. Future research sould focus on scaling up the synthesis of ZIF-8/CMC， optimizing its performance in real-world conditions， and exploring its effectiveness in removing other emerging contaminants. The findings of this study not only advance the understanding of MOF-based hybrid materials but also pave the way for their practical implementation in sustainable water treatment technologies.
- ZIF-8/CMC materials,
- ice-templating freeze-drying method,
- CMC,
- tetracycline,
- Cu²⁺

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References(45)

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