Nanomembrane Canister Architectures for the Visualization and Filtration of Oxyanion Toxins with One‐Step Processing

Abstract

Nanomembrane canister-like architectures were fabricated by using hexagonal mesocylinder-shaped aluminosilica nanotubes (MNTs)-porous anodic alumina (PAA) hybrid nanochannels. The engineering pattern of the MNTs inside a 60 μm-long membrane channel enabled the creation of unique canister-like channel necks and cavities. The open-tubular canister architecture design provides controllable, reproducible, and one-step processing patterns of visual detection and rejection/permeation of oxyanion toxins such as selenite (SeO3(2-)) in aquatic environments (i.e., in ground and river water sources) in the Ibaraki Prefecture of Japan. The decoration of organic ligand moieties such as omega chrome black blue (OCG) into inorganic Al2O3@tubular SiO2/Al2O3 canister membrane channel cavities led to the fabrication of an optical nanomembrane sensor (ONS). The OCG ligand was not leached from the canister as observed in washing, sensing, and recovery assays of selenite anions in solution, which enabled its multiple reuse. The ONS makes a variety of alternate processing analyses of selective quantification, visual detection, rejection/permeation, and recovery of toxic selenite quick and simple without using complex instrumentation. Under optimal conditions, the ONS canister exhibited a high selectivity toward selenite anions relative to other ions and a low-level detection limit of 0.0093 μM. Real analytical data showed that approximately 96% of SeO3(2-) anions can be recovered from aquatic and wastewater samples. The ONS canister holds potential for field recovery applications of toxic selenite anions from water.

Synthesis of microporous nano-composite (hollow spheres) for fast detection and removal of As(V) from contaminated water

“…4b) shows an additional new band at 2357 cm −1 ; this band is usually associated with O]C]Oor HOeC]O compounds. In addition, the υ OH stretching vibration is shifted to 3427 cm −1 after the incorporation of MoO 3 groups within the material [35]. The peaks at 1703 cm −1 and 1630 cm −1 are shifted to 1727 cm −1 and 1622 cm −1 , respectively.…”

“…Different adsorbents such as metal oxides, activated carbons, resins, impregnated resins [26], metal-organic frameworks (MOFs) [27], nanocomposites and biosorbents have been reported for As removal [11,[28][29][30][31][32][33][34]. Cellulose support modified with grafting of amine groups has been used for the binding of copper and the metal-loaded sorbent was efficiently used for As(V) recovery [35][36][37][38]. Molybdate ions are well known for their affinity for arsenate and this interaction has been reported for developing analytical methods but also molybdate-impregnated sorbents that are highly efficient for As(V) recovery [39,40].…”

Effective, Low‐Cost Recovery of Toxic Arsenate Anions from Water by Using Hollow‐Sphere Geode Traps

“…The adsorption kinetic rates of selected target ions were investigated by using the pseudo-first-a nd pseudo-second-order equations by Lagergren,t hat is, ln(q e Àq t ) = lnq e ÀK t t for time-dependent experimental results. [30,31] The adsorption of AsO 3 3À species onto the CNN adsorbent showed pseudo-first-orderk inetics, as indicated by the R 2 values (i.e. correlationc oefficients) in Table S1 and FigureS4A.…”

Antibacterial Activity of Magnesium Oxide Nano‐hexagonal Sheets for Wastewater Remediation

“…Recent advances in the field of nanotechnology and its applications offer overrun chances to create the nextgeneration of unconventional water supply sources. Nanotechnology exhibits efficient performance for economical wastewater purification and removal of pollutants to obtain new water sources [17][18][19][20][21][22][23].…”