Competitive Adsorption of Arsenic and Fluoride onto Economically Prepared Aluminum Oxide/Hydroxide Nanoparticles: Multicomponent Isotherms and Spent Adsorbent Management

Abstract

The present study deals with adsorptive removal of arsenic and fluoride in single as well as bicomponent system using aluminum oxide/hydroxide nanoparticles (AHNP). For single component system, the Langmuir maximum adsorption capacity of the adsorbent is found as 833.33 μg/g for arsenic and 2000 μg/g for fluoride at optimum conditions. The adsorption process is well explained by Langmuir isotherm and pseudo-second-order kinetic models for both arsenic and fluoride. A real groundwater sample, having arsenic 512 μg/L and fluoride 6300 μg/L along with other ions, has also been treated successfully. Among different isotherms, the modified competitive Langmuir isotherm is found to be most suitable to represent the bicomponent system. Solidification of the spent adsorbent through brick formation is investigated, and this process is found to be an effective option for its management. Through economic evaluation, the adsorbent and treatment costs are found as ∼86.89 INR/kg and 0.36 INR/L, respectively.

Quality assessment of drinking water of Multan city, Pakistan in context with Arsenic and Fluoride and use of Iron nanoparticle doped kitchen waste charcoal as a potential adsorbent for their combined removal

“…Earlier studies have also pointed to the fact that at acidic pH values the adsorption of both F − and As 5+ is higher and decrease with increase in pH owing to the decrease in protonated surface sites (Tang et al 2010;Li et al 2011). On contrary in the case of aluminum oxide/hydroxide nanoparticles, the maximum adsorption of F − occurred at pH 7 while that of As 3+ occurs in same pH as reported in present studies, i.e., 4 (Rathore and Mondal 2017).…”

“…As demonstrated by Rathore et al (2017), adsorption of As 3+ and F − on aluminum oxide/hydroxide nanoparticles obeyed Langmuir adsorption model with maximum adsorption capacity of 833.33 µg g −1 and 2000 µg g −1 for As 3+ and F − , respectively, at optimized conditions. For the studies conducted to investigate the potential of Nickel/polypyrrole (Ni/PPy) nanocomposites toward As 3+ and F − removal from polluted water showed much lower adsorption capacities for As 3+ and F − , i.e., 2.64 and 67.71 mg g −1 , respectively, as obtained from Langmuir adsorption model fitting (Srivastava et al 2016).…”

“…It can be observed that in all the samples the percentage removal for F − falls between 81 and 100% while for As 3/5+ removal efficiency varied between 13 and 100%. Whereas work by Rathore et al (2017) using aluminum oxide/ hydroxide nano-adsorbents exhibited a higher, i.e., 98.6 percent removal efficiency of arsenic (initial concentration As: 512 µg L −1 while final concentration after treatment was 7 µg L −1 ). Whereas, F − removal efficiency was observed to be 83.3% (6300-1000 µg L −1 ) from real water samples under optimum conditions (i.e., pH = 7, adsorbent dose = 8 g L −1 and contact time = 300 min).…”

Computational screening of carbon monoxide (CO) adsorption over neutral and charged Al7 clusters

“…Since the presence of toxic gases in environment affects human health, production of a sensor or a device able to detect or adsorb pollutant gases and remove them from the air is important. The adsorption of carbon monoxide on metal surfaces is probably one of the most studied systems in surface science [35, 36, 37, 38, 39]. The interaction of the lone pair ligands, such as CO, with one metal atom leads, very often, to a repulsive potential curve [40]; which is largely due to the repulsion between the metal valence electron(s) and the ligand lone pair.…”

Comparative study on synchronous adsorption of arsenate and fluoride in aqueous solution onto MgAlFe-LDHs with different intercalating anions

“…18,19 It is known that one of the most promising methods for simultaneous removal of arsenic and uoride is adsorption because of its low-cost and convenience. Recently, many adsorbents have been used to remove arsenic and uoride simultaneously, such as granular TiO 2 -La material, 15 aluminum oxide/hydroxide nanoparticles, 20 iron oxide nano particles, 14 chemically treated laterite, 21 brick pieces and marble powder, 22 activated red mud, 23 and layered double hydroxide. 24,25 Layered double hydroxides (LDHs) may be suitable adsorbents for the treatment of arsenic and uoride complexes pollution in water.…”