School of Civil Engineering, Guangzhou University
CUCDEEnvironmental Technology Co., Ltd.

在厌氧膜生物反应器(AnMBR)中,微生物的群体感应会加重生物污染,而调控N-酰基高丝氨酸内酯(AHLs)浓度对膜污染控制至关重要。基于表面分子印迹技术,本研究选用呋喃酮(DMHF)作为AHLs的结构类似物,采用纳米磁性Fe3O4颗粒作为载体,以甲基丙烯酸(MAA)为功能单体、偶氮二异丁腈(AIBN)为引发剂,通过表面聚合成功制备了对DMHF具有选择吸附性的磁性分子印迹聚合物(DMHF/SMIP)。利用傅里叶变换红外光谱仪(FTIR)、扫描电子显微镜(SEM)和振动样品磁强计(VSM)对DMHF/SMIP进行了表征,结果表明,成功包裹印迹层的DMHF/SMIP粒径均匀、晶型稳定,有较好的超顺磁性并且表面含有大量的印迹空腔。随后,进行了DMHF/SMIP吸附性能及其对膜污染控制的模拟研究。结果显示,DMHF/SMIP在50min基本达到吸附平衡,对DMHF的最大吸附量可达85.97mg/g,吸附过程符合二级动力学及Langmuir方程,表明其主要以化学吸附和单层吸附为主。DMHF/SMIP表现出优异的稳定性和可回收性,在经过5次吸附-解吸循环后,吸附效率仍可达83.01%。在选择性吸附实验中,DMHF/SMIP对DMHF及其结构类似物表现出高度选择识别能力,对DMHF、4-甲氧基-2,5-二甲基-3(2H)-呋喃酮和5-羟甲基糠醛的吸附量分别为24.09、12.38和5.34mg/g。利用DMHF/SMIP吸附特征AHLs(C6-HSL),其吸附量可达3.93ug/g,最后,在针对AnMBR的吸附实验中,DMHF/SMIP对C6-HSL的去除率可达到34.87%。本研究制备了一种可选择性吸附且易于循环利用的AHLs分子印迹聚合物,为其在水处理中的应用提供了理论基础技术指导。

In the anaerobic membrane bioreactor (AnMBR), quorum sensing by microorganismsEnergy Environmental Protectionexacerbates biofouling, significantly hindering membrane performance and lifespan. Controlling theconcentration of N-acyl homoserine lactones (AHLs) is crucial for membrane fouling control. Thisstudy used surface molecular imprinting technology, selecting furanone (DMHF) as a structural analogof AHLs and nano-magnetic FeO particles as the carriers. Using methacrylic acid (MAA) as afunctional monomer, and azobisisobutyronitrile (AIBN) as the initiator, a magnetic molecularlyimprinted polymer (DMHF/SMIP) with selective adsorption for DMHF was successfully prepared viasurface polymerization. The DMHF/SMIP was characterized by using a Fourier transform infraredspectrometer (FTIR), scanning electron microscope (SEM), and vibrating sample magnetometer (VSM).These analyses indicated that the DMHF/SMIP, with a successfully encapsulated imprinting layer,exhibited a uniform particle size, stable crystal form, good superparamagnetism, and numerous surfaceimprinting cavities. These features enable the DMHF/SMIP to selectively bind to target molecules.Subsequently, the adsorption performance of DMHF/SMIP and its effect on membrane fouling controlwere evaluated. The results showed that DMHF/SMIP reached adsorption equilibrium in approximately50 minutes, with a maximum adsorption capacity of 85.97 mg/g for DMHF. The adsorption processfollowed second-order kinetics and the Langmuir equation, suggesting primarily chemical andmonolayer adsorption. This indicates that DMHF/SMIP has a high affinity for DMHF and caneffectively remove it from the system. DMHF/SMIP exhibited excellent stability and recyclability,maintaining an adsorption efficiency of 83.01% even after five consecutive adsorption-desorptioncycles. This demonstrates the material′s robustness and potential for long-term use. In selectiveadsorption experiments, DMHF/SMIP showed a high degree of selective recognition for DMHF and itsstructural analogs, with adsorption capacities of 24.09, 12.38, and 5.34 mg/g for DMHF, 4-methoxy-2,5-dimethyl-3(2H)-furanone (mesifurane), and 5-hydroxymethylfurfural, respectively. This selectivityis a key advantage of molecularly imprinted polymers, enabling the targeted removal of specificcompounds from complex mixtures. Using DMHF/SMIP to adsorb representative AHLs (C-HSL), theadsorption capacity reached 3.93 μg/g. This suggests that the polymer can effectively capture AHLs,known to contribute to quorum sensing and biofouling. Finally, in the adsorption experiments, theremoval rate of C-HSL by DMHF/SMIP reached 34.87%. This significant result demonstrates thepolymer′s ability to reduce the levels of AHLs in AnMBR systems, potentially mitigating quorumsensing and biofouling. This study prepared a readily recyclable, magnetic molecularly imprintedpolymer that selectively adsorbs AHLs, providing a theoretical basis and technical guidance for itsapplication in water treatment. The development of such materials could revolutionize biofoulingmanagement in AnMBR systems, leading to more efficient and sustainable wastewater treatment.

国家自然科学基金资助项目(62218901)

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SUN Junqiang, YANG Haiyang, QU Yao, et al. Preparation of magnetic molecularly imprinted polymersbased on group sensing quenching and their adsorption characteristics on signaling molecules[J]. EnergyEnvironmental Protection, 2025, 39(1): 154−164.