Rice-like Ag/Al 2 O 3 nanocomposites preparation from AlOOH nanostructures synthesized via a facile hydrothermal route f
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Rice-like Ag/Al2O3 nanocomposites preparation from AlOOH nanostructures synthesized via a facile hydrothermal route for azo dyes photocatalytic degradation and Pb2+ adsorption Ali Mohammad Latifi1 · Morteza Mirzaei1 · Mehdi Mousavi‑Kamazani2 · Zabihullah Zarghami1 Received: 12 February 2018 / Accepted: 7 April 2018 © Springer Science+Business Media, LLC, part of Springer Nature 2018
Abstract Herein, various morphologies of AlOOH (boehmite) nanostructures were successfully synthesized via a facile hydrothermal route. The obtained AlOOH nanostructures were utilized as a novel starting reagent with A gNO3 and cochineal powder for synthesizing Ag–Al2O3 nanocomposites via a thermal decomposition method. The prepared nanocomposites were applied as photocatalyst for decolorization of acid violet 7 as an azo dye under visible light irradiation. The results showed the rice-like sample (A3) has the highest photodegradation efficiency due to its more surface to volume ratio. Moreover, the synthesized AlOOH nanostructures were directly calcined to transform into rice-like Al2O3 nanostructures as an adsorbent for Pb2+ ions removing from aqueous medium. The rice-like Al2O3 (sample B3) as an adsorbent showed a remarkable adsorption capacity (250 mg/g) compared to other samples with different morphologies.
1 Introduction Nowadays heavy metal and organic pollutions have become one of the most serious environmental problems due to their high toxicity, prevalent, existence and persistence in the environment. The removal of heavy metals from the environment is of special concern due to their persistence. Topically, nanomaterials used for the adsorption of heavy metals have gained considerable interest because of their large surface areas, numerous active sites and unusual adsorptive properties [1–4]. However, the industrial application of nanomaterials in wastewater treatment is limited by low adsorption capacity and high cost [5]. So, finding new nanomaterials with higher adsorption capacity and lower cost is one of crucial challenge. Nanometer aluminum oxides have been widely used in various fields such as adsorbents, catalysts, composite materials [6, 7], humidity sensors and optical materials [8, 9] because they possess many properties such as high surface area [10], large pore volume [11] and high porosity [12]. Various morphologies of Al2O3 * Zabihullah Zarghami [email protected] 1
Applied Biotechnology Research Center, Baqiyatallah University of Medical Science, Tehran, Iran
New Technology Faculty, Semnan University, Semnan, Iran
2
have been synthesized by diverse methods, such as sol–gel synthesis [13] and precipitation technology [14]. Hydrothermal method effectively solves the problem of the larger size, inhomogeneous morphologies and easy agglomeration of products [15, 16]. Hydrothermal synthetic Al2O3 nanostructures are promising nanometer materials for wastewater treatment due to its merits of morphology-controlled synthesis, high specific surface area [17], high purity and high activity [18]. Moreov
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