Enhanced remediation of As (V) and Hg (II) ions from aqueous environments using β-cyclodextrin/MCM-48 composite: Batch and column studies

Synthesis and Characterization of Green ZnO@polynaniline/Bentonite Tripartite Structure (G.Zn@PN/BE) as Adsorbent for As (V) Ions: Integration, Steric, and Energetic Properties

“…The speciation of As (V) at different pH values has a significant impact on the reported adsorption behaviors. The neutral form of As (V) (H3AsO4) can be detected from pH 2 up to pH 4 and the acidic forms as HAsO4 2− and AsO4 3− were recognized as dominant species from pH 7 up to pH 12 [8,41,42]. The acidic forms of As (V) at high pH conditions have remarkable repulsive properties with surficial…”

“…2− and AsO 4 3− were recognized as dominant species from pH 7 up to pH 12 [8,41,42]. The acidic forms of As (V) at high pH conditions have remarkable repulsive properties with surficial chemical groups of BE, PN/BE, and G.Zn@PN/BE, which are affected by the de-protonation effect and are negatively charged and saturated by hydroxyl ions.…”

“…The recommended level of As (V) in water resources should be less than 10 µg/L, beyond this value it will be of significant carcinogenic effects on kidney, skin, lung, and urinary bladder [5,7]. Moreover, several diseases such as esophageal, cardiovascular disease, abdominal pain, bloody diarrhea, vomiting, and diabetes have been documented as the results of the impact of As (V) pollutants [8,9].…”

“…Several techniques have been suggested to reduce As (V) concentrations to acceptable levels, such as chemical precipitation, membrane filtration, ion exchange purification, biological remediation, and adsorption [10,11]. The decontamination of As (V) by adsorption is recommended in several studies as a low-cost, simple, recyclable method [8]. Co-Zn-ZIF [12], ZnO/zeolite [13], MWCNTs [14], iron oxyhydroxide [10], Fe/biochar [7], activated carbon [15] and goethite [16] were studied recently as promising adsorbents for As (V) ions from water.…”

Reusable Nanocomposite Membranes for Highly Efficient Arsenite and Arsenate Dual Removal from Water

“…The NCMs were immersed within the arsenic solution under magnetic stirring for 6 h. Aliquots were taken at defined time intervals (0, 15, 30, 45, 60, 90, 120, 180, 240, and 360 min) for later quantification of arsenic concentration. The kinetic curves were fitted according to nonlinear forms of pseudo‐first‐order, [ 55 ] pseudo‐second‐order, [ 22 ] and Elovich models, [ 56 ] described in Equations ()–(), respectively where Q e and Q t (mg g −1 ) are the capacities for arsenic adsorption at equilibrium and at a specific time, respectively. k 1 (min −1 ) is the pseudo‐first‐order adsorption rate constant, k 2 (g mg −1 min −1 ) is the pseudo‐second‐order adsorption rate constant, α is the initial adsorption rate (mg g −1 min −1 ), and β is the desorption constant (g mg −1 ).…”