Large-Scale Preparation, Chemical Exfoliation, and Structural Modification of Layered Zinc Hydroxide Nanocones: Transformation into Zinc Oxide Nanocones for Enhanced Photocatalytic Properties

Abstract

A convenient and effective water-bath method is developed for the preparation of layered zinc hydroxide nanocones (NCs) intercalated with dodecyl sulfate (C 12 H 25 OSO 3 − , DS − ) anions in large quantities. Furthermore, the morphology, size, and crystal structure of products could also be readily tuned by adjusting the experimental parameters. In particular, unilamellar zinc hydroxide nanosheets with a thickness of approximately 0.9 nm could be achieved by exfoliating the layered zinc hydroxide NCs in the formamide− water mixed solution. It is worth mentioning that layered zinc hydroxide NCs could be topologically converted to basic zinc sulfates (Zn 4 SO 4 (OH) 6 •5H 2 O, Osaka mine) and zinc oxide (ZnO) NCs through a calcination process at different temperatures. Benefitting from a special structure, narrow bandgap, and higher surface area, the photodegradation behavior of ZnO NCs for methylene blue (MB) solution is better than that of ZnO nanorods.

Layered zinc hydroxide monolayers by hydrolysis of organozincs

“… 27 , 34 Assuming that the only other product is excess zinc carboxylate, the LZH-Ole synthesis yields ∼63 mol% Zn in the form of LZH (see ESI, † page 16). Specific yields are scarce in the literature, presumably due to the difficulty of identifying byproducts, but the value compares reasonably to ∼90 mol% Zn and 60–89 mol% Zn reported for LZH–dodecyl sulphate 62 and LZH–benzoate, 63 , 64 respectively.…”

Study of Different Morphology of Zinc Hydroxide Salt as Adsorbent of Azo Dyes

“…Absorption bands less than 719 cm À 1 which are 696 cm À 1 , 584 cm À 1 , and 455 cm À 1 , can be attributed to different ZnÀ O stretching and Zn-OH bending vibrational modes. [20] Considering the intercalation of dodecyl sulfate anion can observe typical bands of this surfactant salt in both LHS-NC and LHS-CO products. Bands in the region of 2912 and 2858 cm À 1 can be attributed to asymmetric and symmetric CH 2 stretching vibration of dodecyl sulfate chain.…”

“…In the range of 1238-821 cm À 1 is possible to observe bands relative to different vibrational and stretching modes of sulfate group. [20] The scanning electron microscopy (SEM) image of the zinc layered hydroxide salts, LHS-NC and LHS-CO are shown in Figure 5. The formation of uniform conical objects is observed for LHS-NC (Figure 5b).…”

Hydrogen production from methanol aqueous solution by ZnO/Zn(OH)2 macrostructure photocatalysts

“…[19][20][21] Therefore, many nano/micro structures of these semiconductors have been reported and they also exhibit good performance in the photocatalytic application eld. 15,22,23 In recent years, with a wide band gap, non-toxic nature, excellent photosensitivity property, and large exciton binding energy, ZnO is considered as a good photocatalyst, which may be a reliable candidate for solving energy problems. 22,24 However, the photogenerated electrons and holes combine readily during the photocatalytic process due to the strong exciton binding.…”