Photo-induced recovery, optical detection, and separation of noxious SeO₃²⁻using a mesoporous nanotube hybrid membrane

Abstract

A macroscopic-scale disc-like membrane capable of photo-induced recovery, optical detection, and separation of ultra-trace levels of SeO 3 2À was fabricated using a mesoporous TiO 2 -SiO 2 nanotube (TSN)-porous anodic alumina (PAA) hybrid. The synergistic pressure-assisted filling and condensed formation of TSN inside the entire PAA (200 nm channel neck size and 60 mm longitudinal length) were evident. This approach enabled fabrication of an optical, photo-induced macroscopic membrane sensor (MS) by direct embedding of an organic colorant onto the long and mesoporous TSN/PAA channels. The TSN-MS structure of uniformly aligned, long, interconnected, tubular and nano-sized channel-like pores integrated the control patterns of photo-induced SeO 3 2À recovery/extraction through surface chelation. As a result, a stable and recyclable TSN-MS against long-term exposure to UV light (for several days) is produced. MS functionality in terms of optical detection and selective separation (i.e., rejection and permeation) of toxic SeO 3 2À among a group of interferent ions was assessed using a simple desktop filtration technique. The developed TSN-MS holds promise for use in advanced indoor and outdoor recovery, detection, and separation of SeO 3 2À from aquatic sources in a one-step process. Our findings expand efforts for the environmental approach for production of SeO 3 2À -free water, photo-hazardous SeO 3 2À collection and management, and volume reduction of solution or solid wastes after multi-cyclic remediation.

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

“…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].…”

Ultrasensitive in-vitro monitoring of monoamine neurotransmitters from dopaminergic cells

“…Fig. S1A shows the N 2 adsorption-desorption isotherm, which identified as type IV with an H1 hysteresis loop [41][42][43]. The pores distribution is investigated by nonlocal density functional theory model (NLDF), which promotes the pore size and pore volume of the constructed NLF.…”

Synthesis of CoZnAl‐layered double hydroxide/graphene oxide nanocomposite for the removal of methylene blue: Kinetic, thermodynamic, and isotherm studies

“…Treatment of urban, industrial, and agricultural wastewater contaminated by various organic and inorganic pollutants is one of the main health priorities . So far, various chemical, biological, and physical methods, for example, adsorption, coagulation, photocatalytic degradation, and membrane filtration, have been used to remove organic pollutants, including dyes, from contaminated waters and wastewaters.…”