Journal of the Taiwan Institute of Chemical Engineers ( IF 5.5 ) Pub Date : 2022-01-19 , DOI: 10.1016/j.jtice.2022.104210 Reza Khavari Farid 1 , Ghasem Rahimi 1
|
Background
Making carbon dots-loaded carriers (CLCs) required the use of two types of precursors (one for carrier particles and the other for carbon dots) and at least three steps. In this study, CLCs were fabricated by using cyanobacterial cells as a dual-purpose precursor and oilothermal as an innovative pyrolysis method.
Methods
The oilothermal method allowed that each cyanobacterial cell (carrier particle precursor) with its hydrous exopolysaccharides (EPSs) layer (carbon dots precursor) to be encapsulated together by an oil micelle and pyrolyzed separate from other cells and formed the CLC in one step. The potential of emerging CLCs for solid-phase extraction (SPE) was assessed. For this purpose, the CLCs were tested in a cadmium-based model.
Significant findings
The range of the maximum pH-dependent adsorption efficiency (>95%) was extensive (pH 4–10). The adsorption kinetics and isotherm had the best fit with the pseudo-second-order and Langmuir linear models, respectively. The adsorption capacity was 5305.61 mg kg−1 only in 2 min exposure time. The findings in this research conclude that emerging CLCs, because of their unique features such as high capacity, fast adsorption rate, fast recovery rate, green origin, optimal and efficient fabrication method, have a high potential for SPE of trace cadmium.
中文翻译：
油热，一种从蓝藻中制备碳点负载载体的新型热解方法，用于镉的固相萃取
背景
制造碳点负载载体 (CLC) 需要使用两种类型的前体（一种用于载体颗粒，另一种用于碳点）和至少三个步骤。在这项研究中，CLCs 是通过使用蓝藻细胞作为双重用途的前体和油热作为一种创新的热解方法来制造的。
方法
油热法允许每个蓝藻细胞（载体颗粒前体）及其含水胞外多糖（EPS）层（碳点前体）被油胶束封装在一起，并与其他细胞分开热解，并一步形成CLC。评估了新兴 CLC 用于固相萃取 (SPE) 的潜力。为此，CLC 在基于镉的模型中进行了测试。
重要发现
最大 pH 依赖性吸附效率（>95%）的范围很广（pH 4-10）。吸附动力学和等温线分别与准二级和朗缪尔线性模型具有最佳拟合。仅在 2 分钟的暴露时间内吸附容量为 5305.61 mg kg -1 。本研究结果表明，新兴的 CLCs 因其容量大、吸附速度快、回收速度快、绿色来源、最佳高效制造方法等独特的特点，在微量镉的 SPE 方面具有很高的潜力。
京公网安备 11010802027423号