Adsorption of sulfamethoxazole and 17β-estradiol by carbon nanotubes/CoFe2O4 composites

Effect of inorganic nanoparticles on 17β-estradiol and 17α-ethynylestradiol adsorption by multi-walled carbon nanotubes

“…In the TGA curves of CNTs, there was major rapid weight loss in the range of 550e650 C for CNTs, CNTs þ I-NPs and CNTs-I-NPs. It has been reported that there is rapid weight loss of CNTs at 550e680 C owing to the decomposition of CNTs (Wang et al, , 2015. The curves then become relatively constant after 700 C. There was approximately 10% of total weight loss for CNTs-I-NPs and CNTs þ I-NPs samples, which is in agreement with the I-NPs/CNTs mass ratio.…”

“…Among various EDCs, 17a-ethynylestradiol (EE2) which has been widely used in oral contraceptives and hormone replacement therapy, was one of principal synthetic estrogens (Li and Sun, 2014); E2 was a natural female hormone excreted by humans, livestock, and wildlife, which is identified to possess the highest endocrine disrupting activity among the natural EDCs (Fan et al, 2007;Nakada et al, 2004). The adsorption behaviors of E2 and EE2 have been widely studied (Sun and Zhou, 2014;Wang et al, 2015). However, little information could be found on the heteroadsorption of E2 and EE2 by multiple NPs.…”

Removal of 17β-estradiol by few-layered graphene oxide nanosheets from aqueous solutions: External influence and adsorption mechanism

“…Langmuir model can be used to describe homogeneous adsorption systems in which adsorption takes place on a homogeneous surface by a monolayer and equivalent sorption [5]. While the Freundlich equation is put forward as an empirical equation which is used to describe heterogeneous systems and is not restricted to the formation of the monolayer [39].…”

“…In recently, a variety of methods have been explored to decontaminate E2 such as adsorption [5], catalytic degradation [3], photo-catalytic degradation [6], biodegradation [7], and advanced oxidation [8]. Among these various methods, adsorption is a superior and widely used method because of its accessibility, high efficiency and environmentally benign.…”

Effects of carbon nanotubes on phosphorus adsorption behaviors on aquatic sediments

“…As shown in Table 2, the Q max of P increased from 0.646 mg/g to 0.996 mg/g with the increase in the MWCNT to sediment ratio from 0.0% to 5.0%, indicating that the MWCNTcontaminated sediments can accumulate increased amounts of P, resulting in more severe pollution (Luo et al, 2010). This phenomenon is related to two factors: (1) the high adsorption capacity of MWCNTs because of the large specific surface area (Ji et al, 2009), Q max of P adsorption by MWCNTs was 3.860 mg/g, which was considerably greater than that by sediments only, (2) owing to MWCNT pollution, the increase in the positive surface charges in sediments enhanced the adsorption ability of sediments (Wang et al, 2015). In addition, compared with the Q max of the sediments only, that for the adsorption of P on the sediments increased by 12.92% with a TiO 2 NP content of 10.0 g/kg in sediments (Luo et al, 2011), while Q max increased by 17.18% (from 0.646 mg/g to 0.757 mg/g, Table 2) for MWCNTs with a TiO 2 NP content of 5.0 g/kg (0.5%) in sediments, indicating that MWCNTs possibly exert a stronger effect on the adsorption of P in sediments compared to TiO 2 NPs.…”