Adsorption/desorption of Cd(II), Cu(II) and Pb(II) using chemically modified orange peel: Equilibrium and kinetic studies

Biosorption of Pb2+ and Cu2+ in aqueous solutions using agricultural wastes

“…Among the adsorbents, agricultural wastes are currently being utilized due to cost and effectivity while helping in minimizing the solid wastes generation problem. A number of agricultural wastes showing the high % removal ranging from 80% up to almost 100% by adsorption were conducted with treated agricultural wastes with chemicals like HCl and HNO 3 [1]; with NaOH [2]; or using other treatments like burned until the wastes turned activated carbon [3,4,5]. This study aimed to determine and compare the adsorptive capacity of Pb 2+ and Cu 2+ in simulated wastewater onto three agricultural wastes, namely, peels of Annona squamosa (custard apple) and Litchi chinensis (lychees), and shoot of Bambusa vulgaris (bamboo) without any utilization of pre-treatments of the biosorbents to promote sustainability of the process.…”

Co-contamination of water with chlorinated hydrocarbons and heavy metals: challenges and current bioremediation strategies

“…Attempts were made by to regenerate the adsorbent as well as resolubilize the metal ions from the spent adsorption. Some amount of metal ions were adsorbed at a neutral pH, with an increase in desorption from 20 to 50 % when the concentration of NaOH was increased from 10 -3 to 10 -2 M. Lasheen et al (2012) observed that regeneration and desorption of heavy metals from orange peel was achieved concurrently by acid elution and that the adsorption capability of the orange peel was retained completely even after four cycles of adsorption-elution.…”

Adsorption of aqueous Pb(II), Cu(II), Zn(II) ions by amorphous tin(VI) hydrogen phosphate: an excellent inorganic adsorbent

“…Another advantage of adsorption is that there is no secondary sludge pollution, and this means not having to invest in infrastructure and sludge-related operations (Semerjian 2010). To date, numerous materials as potential adsorbents for the sequestration of hazardous heavy metals have been studied, such as bottom fly ash (Khan et al 2009), sawdust (Semerjian 2010), peanut husk charcoal (Shang et al 2015), clinoptilolite (Mihaly-Cozmuta et al 2014), chemically modified orange peel (Lasheen et al 2012), poly(amidoamine)-modified graphene oxide (Yuan et al 2013), magnetic Fe 3 O 4 functionalized with EDTA , and carbon nanotubes/silica nanoparticles (Saleh 2015b). Some adsorbents may be low cost, but removal efficiency is poor from a practical perspective.…”