Synthesis of molecularly imprinted polymer for highly selective adsorption of Sulfasalazine from contaminated wastewater.

IF 3.8 3区环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL

Environmental Geochemistry and Health Pub Date : 2025-10-04 DOI:10.1007/s10653-025-02778-1

Sina Zamani, Mohammad Mehdi Rahmani Shamsi, Amir Hossein Javid, Amir Hesam Hasani, Davoud Balarak

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Abstract

The molecularly imprinted polymer (MIP) was synthesized using the bulk polymerization technique and characterized by Scanning electron microscope (SEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller/Barrett-Joyner-Halenda (BET/BJH), Thermogravimetric Analysis (TGA), and point of zero charge (pH_PZC) analyses. The adsorption of sulfasalazine (SSZ) onto the MIP was systematically investigated under various conditions. The researchers investigated the effect of initial SSZ concentration, MIP mass, temperature, pH, and contact time. The highest removal efficiency was achieved at pH 7, MIP dosage of 0.8 g/L, and an initial SSZ concentration of 10 mg/L, with an equilibrium contact time of 75 min. The maximum adsorption capacities obtained from the Langmuir model were 217.1, 235.4, 254.3, and 284.5 mg/g at 20, 30, 40, and 50 °C, respectively, confirming a monolayer adsorption process. Kinetic analysis indicated that the adsorption followed the pseudo-second-order model (R² > 0.995), while thermodynamic studies revealed that the process was spontaneous (ΔG° = -3.41 to -8.95 kJ/mol) and endothermic (ΔH° = 38.4 kJ/mol). The MIP maintained over 93% of its initial adsorption capacity after five regeneration cycles. Competitive adsorption tests further demonstrated a significantly higher affinity of the MIP for SSZ compared with ciprofloxacin and amoxicillin. These results suggest that the synthesized MIP is a highly efficient, selective, and reusable adsorbent for removing SSZ from aqueous environments.

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高选择性吸附废水中磺胺嘧啶分子印迹聚合物的合成。

采用本体聚合技术合成了分子印迹聚合物（MIP），并通过扫描电镜（SEM）、x射线衍射（XRD）、BET/BJH、热重分析（TGA）和零电荷点分析（pHPZC）对其进行了表征。系统研究了不同条件下MIP对磺胺嘧啶的吸附。研究人员考察了初始SSZ浓度、MIP质量、温度、pH值和接触时间的影响。当pH为7、MIP投加量为0.8 g/L、初始SSZ浓度为10 mg/L、平衡接触时间为75 min时，去除率最高。Langmuir模型在20、30、40和50℃条件下的最大吸附量分别为217.1、235.4、254.3和284.5 mg/g，证实为单层吸附过程。动力学分析表明，吸附过程符合准二阶模型（R2 > 0.995）；热力学研究表明，吸附过程为自发吸附（ΔG°= -3.41 ~ -8.95 kJ/mol）和吸热吸附（ΔH°= 38.4 kJ/mol）。经过5次再生循环后，MIP的初始吸附容量仍保持在93%以上。竞争吸附实验进一步表明，与环丙沙星和阿莫西林相比，MIP对SSZ的亲和力显著提高。这些结果表明，合成的MIP是一种高效，选择性和可重复使用的吸附剂，用于去除水中环境中的SSZ。

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来源期刊

Environmental Geochemistry and Health 环境科学-工程：环境

CiteScore

8.00

自引率

4.80%

发文量

279

审稿时长

4.2 months

期刊介绍： Environmental Geochemistry and Health publishes original research papers and review papers across the broad field of environmental geochemistry. Environmental geochemistry and health establishes and explains links between the natural or disturbed chemical composition of the earth’s surface and the health of plants, animals and people. Beneficial elements regulate or promote enzymatic and hormonal activity whereas other elements may be toxic. Bedrock geochemistry controls the composition of soil and hence that of water and vegetation. Environmental issues, such as pollution, arising from the extraction and use of mineral resources, are discussed. The effects of contaminants introduced into the earth’s geochemical systems are examined. Geochemical surveys of soil, water and plants show how major and trace elements are distributed geographically. Associated epidemiological studies reveal the possibility of causal links between the natural or disturbed geochemical environment and disease. Experimental research illuminates the nature or consequences of natural or disturbed geochemical processes. The journal particularly welcomes novel research linking environmental geochemistry and health issues on such topics as: heavy metals (including mercury), persistent organic pollutants (POPs), and mixed chemicals emitted through human activities, such as uncontrolled recycling of electronic-waste; waste recycling; surface-atmospheric interaction processes (natural and anthropogenic emissions, vertical transport, deposition, and physical-chemical interaction) of gases and aerosols; phytoremediation/restoration of contaminated sites; food contamination and safety; environmental effects of medicines; effects and toxicity of mixed pollutants; speciation of heavy metals/metalloids; effects of mining; disturbed geochemistry from human behavior, natural or man-made hazards; particle and nanoparticle toxicology; risk and the vulnerability of populations, etc.