Geogenic arsenic removal through core–shell based functionalized nanoparticles: Groundwater in-situ treatment perspective in the post–COVID anthropocene

Abstract

Graphical abstract

Differentiating Nanomaghemite and Nanomagnetite and Discussing Their Importance in Arsenic and Lead Removal from Contaminated Effluents: A Critical Review

“…Indeed, many magnetic Fe-oxide NP composites have been tested as As adsorbents in recent years [ 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 ]. Their adsorbent properties and experimental conditions are exposed and a comparison of their removal efficiency and an analysis of the experimental condition effects (pH, temperature, adsorbent dose, initial concentration, particle size and shape, surface area, and saturation magnetization, equilibrium time, kinetic and isothermal adsorption parameters) [ 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 ,…”

“…However, room temperature has been chosen by many authors due to its commonness in nature and because this temperature usually exhibits a good removal performance, reducing the cost of the entire process. The effects of pH on As(V) adsorption have been mainly attributed to the protonation and deprotonation of the adsorbent’s surface below and above the p.z.c., respectively [ 42 , 60 , 62 , 63 , 64 , 66 , 70 ]. This effect is due to the negative charge of As(V), which engages in an electrostatic interaction with the surface radicals of the adsorbents.…”

“…In a first phenomenological description of As adsorption processes, the Langmuir adsorption model is the most used one [ 42 , 60 , 64 , 65 , 70 , 75 ], while the Freundlich adsorption model can be considered as the second most applied [ 63 , 68 , 71 ] for both As(III) and As(V). For these reasons, it can be indirectly inferred that the monolayer adsorption mechanism is used more often than the multilayer adsorption.…”

“…Navarathna et al [ 59 ] found that: (i) the As percentage reached its highest value at 20 mg g −1 and (ii) it increased from 5 to 10 mg g −1 due to the multilayer adsorption character that occurs on the nano-Fe 3 O 4 surface. Raval et al [ 63 ] also found that increasing the As(V) concentration from 10 μg L −1 to 150 μg L −1 lowered the adsorbed As percentage due to the saturation of available adsorption sites in the bilayer–OA@FeO NPs adsorbent. Moreover, they also observed that the adsorption capacity increased due to the high driving force to transfer the mass of elevated concentrations of As(V) in the solution, as observed in the adsorption isotherms.…”

The latest strategies in the fight against the COVID-19 pandemic: the role of metal and metal oxide nanoparticles

“…Various portable bio-sensors with the help of metals and metal oxides can detect SARS-CoV-2 in a short time and reduce its spread. [21][22][23][24] So, due to the value of metal and metal oxide nanoparticles to control the epidemic of the virus worldwide, it is necessary to collect the latest strategies and new achievements in this regard and make them available to interested researchers. This review examines the use of metals and metal oxides such as Cu, Ag, Au, Fe 3 O 4 , CuO in the development of useful tools to combat the SARS-CoV-2 virus crisis.…”