Fabrication of Hollow LDH nanocages using ZIF-67 template as superb adsorbent for anionic organic pollutant
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Fabrication of Hollow LDH nanocages using ZIF‑67 template as superb adsorbent for anionic organic pollutant Qian Wang1 · Xiaofei Wang2 · Huairu He1 · Wei Chen3 Accepted: 1 November 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Zeolitic imidazolate framework-67 (ZIF-67) was occupied as self-sacrifice template to fabricate hollow LDH nanocages, and the template was consumed during the formation of LDH nanocages. The nanocages composed of NiCo-LDH nanosheets maintained the dodecahedron shape of the ZIF-67 template. The resultant LDH nanocages were of large surface area and hollow porous structure and performed excellent in the adsorptive removal of Congo Red (CR). Influence of factors on the removal of CR was investigated and kinetic study and thermodynamic study were carried out to verify that the removal of CR was a chemisorption process. LDH nanocages after adsorption can be separated and regenerated through solvothermal method using ethanol, and the regenerated LDH nanocages can be recycling used and 89.3% removal of CR can still be reached in the fifth cycling. Keywords Adsorption · ZIF-67 · LDH nanocages · Organic dyes
1 Introduction Organic dyes widely used in industrial, containing functional groups, are harmful to human beings and difficult to be degraded [1]. Wastewaters containing organic dyes are usually of deep color, high toxicity and high COD content [2]. Advanced oxidation technologies (AOTs) characterized Electronic supplementary material The online version of this article (doi:https://doi.org/10.1007/s10934-020-01007-7) contains supplementary material, which is available to authorized users. * Qian Wang [email protected] * Xiaofei Wang [email protected] 1
School of Materials Science and Chemical Engineering, Xi’an Technological University, No. 2 Middle Xuefu Rd., Weiyang District, Xi’an 710021, People’s Republic of China
2
School of Materials Science and Engineering, Shaanxi University of Science and Technology, No. 7 Middle Xuefu Rd., Weiyang District, Xi’an 710021, People’s Republic of China
3
Chongqing Key Laboratory of Environmental Materials & Remediation Technologies, Chongqing University of Art and Science, Chongqing 402160, China
by the generation of hydroxyl radicals (·OH) were considered ideal for the degradation of organics theoretically [3, 4]. But, actually, AOTs only work effectively under narrow conditions, and organic pollutants usually were oxidized to decompose to intermediates with smaller molecule weights instead of CO2, H2O and inorganic salts directly [5, 6], which maybe even more toxic [7]. By contrast, adsorption was much more efficient and safe in the removal of pollutants from aqueous solution. Traditional adsorbents including activated carbon [8], resin [9], zeolites [10, 11], layered double hydroxides (LDHs) and etc. are usually with disadvantages of small surface areas and low adsorption capacity [12, 13], leading to quite long equilibrium time and low removal efficiencies [14]. Even, some of these adsor
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