期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 644, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2022.128811
关键词
Methylene Blue; Adsorption; Photocatalytic Degradation; Barley Straw; Silica; CuO
资金
- Taif University, Taif, Saudi Arabia [TURSP-2020/135]
This article reports the synthesis of a novel mesoporous CuO@barley straw derived SiO2 (CuO@BSS) nanocomposite and its application as a photocatalyst and adsorbent for the removal of methylene blue from water. The results showed that MB photodegradation was more efficient than adsorption on the CuO@BSS nanocomposite at pH 10, with 90% and 99% removal of MB dye achieved through adsorption and photodegradation techniques, respectively.
In this article, we have reported synthesizing a novel mesoporous CuO@barley straw derived SiO2 (CuO@BSS) as a photocatalyst and adsorbent for methylene blue (MB) removal from aqueous media. Silica nanoparticle as a platform was prepared from barley straw, then modified by grafting of CuO nanoparticles. Our strategy represents a significant development in recycling agricultural waste, such as barley straw, offering a cost for effective photocatalyst and adsorbent. The as-prepared CuO@BSS nanocomposite was characterized using FE-SEM, EDX, TEM, XRD, FT-IR, TGA, and N-2 adsorption-desorption. The effect of the pH, CuO@BSS dosage, temperature, time, and initial MB-concentration was systematically investigated. Furthermore, isotherm, kinetic and thermodynamic of MB-removal were also studied. The obtained results indicated that MB-photodegradation is a more convenient method in removing MB than the adsorption process onto mesoporous CuO@BSS nanocomposite at pH 10, where 90% and 99% of MB-dye were removed through adsorption and photodegradation techniques, respectively. The calculated values of Delta G degrees, Delta H degrees, and Delta S degrees indicate adsorption's spontaneous and endothermic behavior. The prepared CuO@BSS nanocomposite is a promising candidate for removing MB from real water samples even at high MB concentrations or even after multi-reuse cycles.
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