Study on adsorption of Cu(II)–Cr(VI) binary system by carbonized Eupatorium adenophorum

Abstract

We first report a mechanism study on the adsorption of Cu(II)-Cr(VI) binary mixture by a novel low-cost adsorbent, carbonized Eupatorium adenophorum. The influences by pH value, dosage, initial concentration, temperature, and adsorption time on its performance to absorb copper and chromium were investigated. The experimental data were fitted according to the Langmuir and Freundlich adsorption isotherm models, the pseudo-first-order kinetics, the pseudo-second-order kinetics, and the intra-particle diffusion model. The results indicated that when the reaction system was with its pH = 5, the dosage of carbonized Eupatorium adenophorum was 0.1 g, the adsorption time was 30 min, and the temperature was 25°C; the adsorption capacities for Cu(II) and Cr(VI) reached 27.62 mg/g and 9.68 mg/g, respectively. The process of carbonized Eupatorium adenophorum to absorb Cr(VI) is also accompanied by redox reactions. The Langmuir model and the pseudo-second-order model can better fit the experimental data. Observation by fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) found no significant change of functional groups before and after the adsorption by carbonized Eupatorium adenophorum, and this adsorption process is mainly a physical adsorption. ARTICLE HISTORY

Application of pyridine-modified chitosan derivative for simultaneous adsorption of Cu(II) and oxyanions of Cr(VI) from aqueous solution

“…C1 presented a higher Qmax than other bioadsorbents reported in the literature (Chen et al, 2016;Dong et al, 2010). For example, Chen et al (2016) (Dong et al, 2010).…”

“…C1 presented a higher Qmax than other bioadsorbents reported in the literature (Chen et al, 2016;Dong et al, 2010). For example, Chen et al (2016) (Dong et al, 2010). In a previous study, Almeida et al (2016) reported the synthesis of an efficient adsorbent by quaternization of the amine group of chitosan and esterification of -OH groups with EDTA dianhydride.…”

“…In addition to the tannery industry, copper is also emitted from the sewage pipe lines (Sarkar et al, 2015). Regarding this kind of waste, some works reported the use of photoreduction (Yan et al, 2020) and adsorption on carbonized crofton weed (Chen et al, 2016) and hyacinth shoot powder (Sarkar et al, 2017) for simultaneous removal of Cr(VI) and Cu(II). Copper and chromium are also present in the formulation of chromated copper arsenate (CCA), a wood preservative to avoid attack by termites and fungi (ATSDR, 2011).…”

Bio-accumulation effects of heavy metals Pb, Zn and Cd on Procecidochares utilis parasitism to Eupatorium adenophorum at Suzu metal mines, Yunnan

“…Ageratina adenophora , common name: Crofton weed), is now a widespread noxious invasive weed, which is spreading rapidly in China and causing substantial damage to the ecological environment currently ( Oelrichs et al., 1995 ; Sharma et al., 1998 ; Wan et al., 2010 ; Wan et al., 2010 , 2010 ; Wang and Wang, 2006 ; Wu et al., 2020 ; Yu et al., 2005 ; Zheng et al., 2009 ). Studies have shown that, in some metal mines where E. adenophorum had spread, it has been proven to be an efficient accumulator of lead (Pb), Zinc (Zn), and cadmium (Cd) ( Chen et al., 2014 , 2016 ; Li et al., 2016 ; Li and Zhang, 2008 ; Song et al., 2016 ; Wang et al., 2013 ; Wang and Zhang, 2008 ; Zu et al., 2005 ). These metals deposited in E. adenophorum may be transmitted and bio-accumulated in natural enemies, which will frequently exert significant negative effects on natural enemies, influencing its parasitic activity, for example, Procecidochares utilis Stone ( Wang et al., 2013 ; Ma et al., 2018 ).…”