Efficient removal of chromate and arsenate from individual and mixed system by malachite nanoparticles

Adsorption of arsenic(V) from aqueous solutions by goethite/silica nanocomposite

“…Conversely, goethite/silica nanocomposite' surfaces were negatively charged when pH is above 5.9, resulting in electrostatic repulsion with anionic As(V). Therefore, the adsorption of As(V) decreased with increasing pH, and this has been well reported by previous researchers in their work on the adsorption of arsenic by various nanoparticles (Basu and Ghosh 2013;Chowdhury and Yanful 2010;Tuutijarvi et al 2009;Saikia et al 2011). In the present study, the main adsorption mechanism between goethite/silica nanocomposite and As(V) is due to electrostatic attractions.…”

“…In recent studies, several nanoscale adsorbents such as cupric oxide (Martinson and Reddy 2009), iron(III) oxide (Prucek et al 2013), iron-cerium oxide (Basu and Ghosh 2013), magnetite-maghemite (Chowdhury and Yanful 2010), zirconium oxide spheres (Hristovski et al 2008), maghemite (Tuutijarvi et al 2009), malachite (Saikia et al 2011) iron-copper binary oxide , titanium dioxide (Valencia-Trejo et al 2010), and zirconium oxide (Hang et al 2012) were used to remove As(V) in aqueous solutions. The authors reported that the abovementioned nanoparticles have a higher surface area and higher adsorption capacity for As(V).…”

Arsenic removal by nanoparticles: a review

“…However, elevated concentrations of phosphate (>0.2 mM) had a negative effect on arsenic removal. Saikia et al (2011) reported of high adsorption capacities for chromate and arsenate ions on malachite nanoparticles. However, the adsorption efficiency decreased with the increase of solution pH.…”

Response surface methodological approach for the optimization of adsorption process in the removal of Cr(VI) ions by Cu2(OH)2CO3 nanoparticles

“…Page 18 of 51 A c c e p t e d M a n u s c r i p t 18 In order to investigate the mechanism of adsorption of Cr(VI) on nanoparticles, experimental data was analysed by applying intra particle diffusion model. The intra-particle diffusion model can be described as follows [10]: (11) Where k id is the intraparticle diffusion rate constant (mg/g.min 0.5 ) and C is the intercept (mg/g).…”

“…Very few articles are available regarding the application of Cu 2 (OH) 2 CO 3 nanoparticles for the treatment of wastewater [15,17,18].…”