Self‐assembly of α‐MoO₃ flower as a highly effective organics adsorbent for water purification

Abstract

We report α‐MoO3 flowers as a highly effective organics adsorbent for the first time. With α‐MoO3 microfibers (MFs), α‐MoO3 flowers uniformly self‐assemble on a carbon cloth, serving as a great organics scavenger. They not only provide a high specific surface area but also possess van der Waals force, both of which guarantee a high adsorption efficiency for multiple organics. Nearly 100% of Rhodamine B (RhB), methylene blue (MB), and crystal violet (CV) are rapidly adsorbed while flowing through the designed α‐MoO3 flower‐based filtration device. Even after five recycling times, its high adsorption efficiency toward RhB remains unaffected. The adsorption capacity of α‐MoO3 flowers for RhB, MB, and CV reaches up to 4974, 6217, and 3886 mg/m2, respectively. Additionally, this novel adsorbent can adapt to a wide pH range, maintaining the excellent capacity of 4774 and 4473 mg/m2 toward RhB at pH of 2.0 and 12.0. The α‐MoO3 flowers can also adsorb other organics, including MO, noroxin, and tetracycline hydrochloride. Moreover, the free‐standing α‐MoO3 flowers on a carbon cloth realize the adsorptive filtration for organics removal, which not only require no conditions and no energy consumption but also avoid secondary pollution to the water as compared to the powdery adsorbents.

Synthesis of 2D MoO3−x/N-doped-carbon nanocomposites via in situ carbonization of layered (NH4)Mo3O9–(NH4)2Mo4O13-organic hybrid nanomaterials for exceptionally efficient adsorption and separation of organic dyes

“…6,12 Recently, several transition metal oxide (TMO)-based nano/ microstructures were reported to exhibit improved removal capability for organic dyes in water by the adsorption mechanism, with enhanced reusability, e.g., nickel oxide, 13 zinc oxide, 14 copper oxide, 15 iron oxide, 16 tungsten oxide, 17 and molybdenum trioxide (α-MoO 3 ). [18][19][20][21][22][23][24][25][26][27][28] Compared to the activated carbon, TMO nanostructures exhibited comparable adsorption capacities and induced selectivity based on surface functionalization. α-MoO 3 as an important TMO, has been widely investigated and has presented a wide range of potential applications in the fields of electrochromism/photochromism devices, 29,30 SERS, 31 gas sensors, 32 field emission devices, 33 capacitors, 34 catalysts and photocatalysts, 35,36 H 2 generation, 37 and lithium-ion batteries, 38,39 etc.…”

Colorimetric determination of cysteine and copper based on the peroxidase-like activity of Prussian blue nanocubes

“…In the emerging development of nanotechnology, many novel nanomaterials have been synthesized with intrinsic mimic-like activity, behaving as mimicking enzymes in the place of established enzymes. A variety of nanomaterials, such as metals (Cu 2+ ), 30 bimetals (Au@Pt, Au@Pd), 31,32 metal oxides (CuO, CeO 2 ), 33,34 metal suldes (MoS 2 ), 35 metal organic frameworks MOFs, 36 carbon-based nanomaterials, [37][38][39][40] Au nanoclusters 41 and TiO 2 nanotube arrays, 42 have been proved to possess peroxidase-mimicking activity. Among these, Prussian blue (PB) based materials have been extensively applied in different elds, such as electrochemical sensors, [43][44][45] ber optic gas sensors, 46 the oxygen reduction reaction, 47 and lateral ow assays.…”

A novel efficient RhB absorbent of Mo2N/MoO2 composite nanofibers for wastewater treatment

“…1 For efficient water purification, absorption is considered as one of the most effective way. [2][3][4] So far, activated carbon materials are the commonly used absorbents due to its high-specific surface area. 5,6 However, the relatively low efficiency and poor cycling properties still unable to meet the present need for water purification, so it is desirable to exploit new absorbents.…”

“…Water contamination, especially dye pollution has detrimental impact on human health and the environment . For efficient water purification, absorption is considered as one of the most effective way . So far, activated carbon materials are the commonly used absorbents due to its high‐specific surface area .…”