Cr-MOF-Based Electrochemical Sensor for the Detection of P-Nitrophenol

Abstract

Cr-MOF nanoparticles were synthesized by a simple hydrothermal method, and their morphology and structure were characterized by SEM, TEM, and XRD techniques. The Cr-MOF modified glassy carbon electrode (Cr-MOF/GCE) was well constructed and served as an efficient electrochemical sensor for the detection of p-nitrophenol (p-NP). It was found that the Cr-MOF nanoparticles had significant electrocatalytic activity toward the reduction of p-NP. The Cr-MOF-based electrochemical sensor exhibited a low detection limit of 0.7 μM for p-NP in a wide range of 2~500 μM and could maintain excellent detection stability in a series of interfering media. The electrochemical sensor was also practically applied to detect p-NP in a local river and confirmed its validity, showing potential application prospects.

MOF derived metal oxide nanohybrids with in situ grown rGO: a smart material for simultaneous electrochemical sensing of HQ and RS

“…Moreover, its sensitivity was superior or equivalent to previously reported sensors. 21 Additionally, to address the limited electrical conductivity of MOFs, researchers have explored synergistic strategies by integrating MOFs with other functional materials known for their high electrical conductivity. 22 This method not only boosts the electrochemical stability of MOFs but also retains their distinctive porous structure, facilitating the development of efficient sensors.…”

Efficiently improving the adsorption capacity of the Rhodamine B dye in a SO3H-functionalized chromium-based metal–organic framework

“…Among the recently discovered adsorbents, metal-organic frameworks (MOFs) are known for their porous morphology with adjustable pore size and modification of functional groups on the ligand, resulting in remarkable advantages such as large surface area, low density, and high thermal and chemical stability. [33][34][35][36][37][38] Interestingly, the MOF structure can be controlled, allowing the generation of effective interactions between guest molecules and the adsorption sites, opening unique applications related to adsorption. [39][40][41][42][43][44] Noteworthily, chromium-based MOFs have emerged as ultra-high water stable materials because of their robust metal-carboxylate bonds and rigid frameworks, leading to many applications of adsorption under practical conditions.…”

Electrochemical Detection of Flutamide by the Composite of Complex Based on Thiacalix[4]arene Derivatives and Reduced Graphene Oxide

“…Metal–organic frameworks (MOFs) are widely used in electrochemical sensing due to their diverse structures. − The metal ions in most MOFs have electrochemical activity, and the organic ligands have abundant active sites, which makes them have strong adsorption capacity. Dispersing carbon materials on the surface of MOFs can make the materials have a larger specific surface area and a higher conductivity, which is conducive to the enhancement of electrocatalytic signals. − The MOFs constructed by thiacalix[4]arene derivatives have attracted much attention due to their abundant active sites and large cavity structure. − However, it also has its shortcomings, such as poor electrical conductivity and low performance in the electrochemical detection of drugs. To improve electrical conductivity, carbon-based materials with good conductivity, high porosity, and large specific surface area are introduced into MOFs to form composite materials, which can effectively solve this problem. − The structure of reduced graphene oxide (RGO) is relatively stable, and it has a large specific surface area, good electrical conductivity, and some residual carboxyl, hydroxyl, and epoxy groups on the surface. , Mesoporous carbon (MC) has a large surface area, good conductivity, and high porosity so it has good adsorption capacity .…”