## 1 Introduction  
In recent years, with the rapid development of industrialization, the problem of water pollution has become increasingly prominent. The pollutants of concern include bisphenol A (BPA), a ubiquitous chemical widely used in the production of plastics and resins. However, BPA is a quintessential endocrine disruptor in the environment [1] and can disrupt the normal physiological functions of the human body even in minute quantities. Numerous studies have revealed that BPA enters the human body through various common pathways, such as contaminating water, food, cooking fumes, and even through daily direct contact, posing threats to human health and affecting estrogen levels. The extensive production and use of BPA has led to its widespread presence in the environment, and it has even been detected in drinking water [2; 3; 4]. Currently, numerous technologies have been developed to eliminate BPA, including advanced oxidation processes, biodegradation, membrane separation, adsorption [5; 6; 7; 8], and more. In fact, a large number of researchers believe that adsorption [9; 10] is better than other methods, as it can quickly and effectively adsorb pollutants. Additionally, adsorption offers advantages such as cost-effectiveness, efficiency, simple design, and fewer harmful by-products. With their exceptional adsorption efficacy, various carbon materials [11], such as graphene oxide (GO), activated carbon (AC), and carbon nanotubes (CNTs) [12; 13; 14; 15], have been increasingly adopted as preferred adsorbents for the eradication of contaminantsfrom aquatic environments. Among them, CNTs [16], as a new adsorbent material, have been used in many studies [17] to adsorb pollutants in water owing to their extensive surface area and plentiful reactive sites. Evidence confirms that CNTs possess a strong capacity to adsorb phenols, heavy metals, and natural organic compounds effectively [18]. Nevertheless, the isolation of CNTs from suspension in aqueous media poses a challenge because of their minute dimensions, and their introduction into water resources may result in secondary pollution [19]. On the other hand, magnetic nanoparticles such as Fe\({}_{3}\)O\({}_{4}\), \(\gamma\)-Fe\({}_{2}\)O\({}_{3}\), and Fe\({}^{0}\) have drawn considerable interest due to their excellent adsorption characteristics [20; 21], and their inherent superparamagnetism enables them to be readily extracted from aqueous environments using magnetic attraction after application. The practical usage of magnetic nanoparticles often faces issues like pronounced clustering in suspension and a susceptibility to being lost via water runoff. Therefore, CNTs are usually used as a carrier [22; 23] to support magnetic nanoparticles such as Fe\({}_{3}\)O\({}_{4}\) and Fe\({}^{0}\), and their superparamagnetism [24] is used to enable them to effectively perform magnetic separation in water, which is not only conducive to improving the adsorption performance, but also to improving the dispersion and mechanical properties [25; 26] of these magnetic nanoparticles in practical applications. For example, [PERSON] et al. [27] successfully fabricated a recyclable CNTs/Fe\({}_{3}\)O\({}_{4}\) magnetic composite via a hydrothermal method, which exhibited robust adsorption behaviors towards BPA. [PERSON] et al. [28] synthesized multi-walled carbon nanotubes coated with CoFe\({}_{2}\)O\({}_{4}\) nanoparticles using solvothermal co-precipitation and electrophoretic precipitation methods, and applied it to the adsorption of BPA in water. The experimental findings indicated that the incorporation of a composite material significantly augmented the adsorption capabilities as well as enhanced the characterization attributes of multi-walled carbon nanotubes (MWCNTs). [PERSON] et al. [29] synthesized MWCNTs modified with iron oxide and manganese dioxide (MWCNTs-FeO-MnO) via the co-precipitation method, and utilized them to determine the levels of residual BPA in bottled water supplies.