光催化
木质素
纳米复合材料
水溶液
解聚
分解
材料科学
降级(电信)
化学工程
X射线光电子能谱
有机化学
化学
催化作用
纳米技术
高分子化学
工程类
电信
计算机科学
作者
Shelja Sharma,Sandeep Kumar,Senthil Murugan Arumugam,Sasikumar Elumalai
标识
DOI:10.1016/j.apcata.2020.117730
摘要
The complex branched structure of lignin offers challenges in its chemical/biological transformation. The recalcitrant nature hampers its effective utilization towards the synthesis of potential chemicals and products through depolymerization. Herein, we demonstrate the effective process for lignin decomposition via photocatalysis using CQDs decorated TiO2 nanohybrid in aqueous conditions. Indeed, the sophisticated analytical determinations, including powder XRD, HR-TEM, and XPS, witnessed the structural characteristics of the as-prepared TiO2/CQDs nanocomposite. The photocatalyst promoted a nearly complete decomposition of commercial alkali lignin up to 99 % with the direct sunlight illumination, yielding a different variety of market-value lignin derivative products like m-anisic acid (3-methoxybenzoic acid) and p-hydroxybenzoic acid (PHBA) with 20 % and 16.25 % selectivity, respectively, through the probable oxidation mechanism. Upon verifying its effectiveness towards the decomposition of kraft lignin, it showed a promising response (80 % conversion) within 6 h of photocatalysis. The recyclability study showed that the photocatalyst has an exceptional photostability.
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