Sustainable production of nitrogen-doped carbon quantum dots for photocatalytic degradation of methylene blue and malachite green
Sustainable production of nitrogen-doped carbon quantum dots for photocatalytic degradation of methylene blue and malachite green
复制标题
DOI：
10.1016/j.jwpe.2020.101816
复制
发表时间：
2021-04-01
影响因子：
7
通讯作者：
Mohammad, Abdul Wahab
中科院分区：
文献类型：
--
作者：
Rani, Umairah Abd;Ng, Law Yong;Mohammad, Abdul Wahab
空果串（EFB）是马来西亚最丰富的农业废物来源，但应用有限。由于 EFB 的碳、氧和氢含量较高，因此可用于生产碳基纳米粒子。本研究介绍了一种利用从 EFB 中提取的木质素作为原材料，通过水热处理来制造氮掺杂碳量子点 (NCQD) 的可持续途径。由于其优异的光学性能，NCQD 在紫外灯下显示出蓝色荧光。经过几个小时的紫外光照射和超过八个月的储存后，NCQD 的光学性能保持不变，表明其具有出色的反应性和稳定性。 NCQD 的平均粒径为 3.6 nm。 NCQD 在阳光照射 180 分钟和 120 分钟内分别降解了 97% 的亚甲基蓝和 98% 的孔雀石绿。这些染料的光催化降解速率遵循基于 Langmuir-Hinshelwood 模型的一级动力学。这项研究展示了一种生产高效光催化剂的有吸引力的方法，用于水处理中有机染料的光催化降解。
Empty fruit bunches (EFB) are the most abundant source of agricultural wastes in Malaysia but with limited applications. Due to their high content of carbon, oxygen and hydrogen, EFB can potentially be used to produce carbon-based nanoparticles. This study introduces a sustainable route to fabricate nitrogen-doped carbon quantum dots (NCQDs) through hydrothermal treatment using lignin that was extracted from EFB as a raw material. The NCQDs showed blue fluorescence under a UV lamp owing to their excellent optical properties. The optical properties of NCQDs remained unchanged after several hours of UV-light exposure and over eight months of storage, indicating an outstanding reactivity and stability. The average particle size of NCQDs was found to be 3.6 nm. The NCQDs degraded 97 % of methylene blue and 98 % of malachite green within 180 min and 120 min of sunlight irradiation, respectively. The photocatalytic degradation rate of these dyes followed first-order kinetics based on the Langmuir-Hinshelwood model. This research demonstrates an attractive way of producing a highly efficient photocatalyst towards the photocatalytic degradation of organic dyes in water treatment.