Novel carbon nano-onions from paraffinum liquidum for rapid and efficient removal of industrial dye from wastewater

Mesoporous onion-like carbon nanostructures from natural oil for high-performance supercapacitor and electrochemical sensing applications: Insights into the post-synthesis sonochemical treatment on the electrochemical performance

“…The D-band is highly sensitive to structural disorder and defects and is also caused by the amorphous/sp 3 carbon, surface functional groups, disrupted sp 2 hybridized carbon network, intercalated C and H atoms, vacancies, dangling bonds, foreign atoms, etc. in the OLCs [21] , [22] , [23] . The ratio of the intensity of D band to G band is a significant parameter to determine the disorder degree in carbon materials.…”

“…The peak discerned at 1592 cm −1 is a consequence of the conjugated stretching mode of sp 2 carbon ( v C=C ) and carbonyl groups ( v C=O ) and bending mode of hydroxyl groups (δ O-H ). The broad peak at 1184 cm −1 arises from the stretching vibration of carboxyl, phenol, and epoxy groups (v C-O ) [23] , [34] . The oxygen moieties on the a-OLCs emerge during the open-air synthesis.…”

Valorization of agro-industrial fruit peel waste to fluorescent nanocarbon sensor: Ultrasensitive detection of potentially hazardous tropane alkaloid

“…The doublet peaks observed at 2856 cm -1 and 2923 cm -1 are attributed to the C-H stretching modes of CH 2 and CH 3 groups on fNDC. The peak located at 1615 cm -1 is ascribed to the bending vibration of OH groups, while the shoulder peak noticed at around 1700 cm -1 is caused by the C = O stretching vibration of carboxylic acid (Venkatesan and Balachandran, 2020). The strong peak at 1056 cm -1 and its shoulder peaks at 1100 cm -1 and 1159 cm -1 could be accredited to the C-O stretching vibration of pyranose rings, epoxy, phenol, ether, and ester groups (Xiao et al, 2015b).…”

Squaramide-Immobilized Carbon Nanoparticles for Rapid and High-Efficiency Elimination of Anthropogenic Mercury Ions from Aquatic Systems

“…For instance, conventional adsorbents such as clays, activated carbon, waste biomass, and zeolites were used for mercury (Hg) decontamination. − However, these materials endure inherent limitations, including poor selectivity, weak binding affinity, and low mercury uptake. Therefore, recent developments in science and nanotechnology have amplified the efficiency of adsorbent materials, offering advanced strategies for improving environmental remediation. , To achieve excellent selectivity, fast kinetics, and exceptional uptake capacity, the advancement of efficient adsorption strategies has come into play to combat HMIs. − A variety of carbonaceous materials, including fullerene, carbon nanotubes, graphene, and carbo nano-onions (CNOs) or carbon nanoparticles (CNPs) have been used as adsorbents for the removal of HMIs and dyes. − For instance, mercury was removed by using magnetite single-walled carbon nanotubes and magnetite cobalt sulfide nanocomposites . Unfortunately, carbon nanotubes are extremely expensive and toxic, and they exhibit agglomeration in solvents .…”

“…The CNPs have transpired as a new class of carbonaceous materials known as hyperfullerenes and multilayer fullerenes . CNPs have been used as potential nanomaterials for energy storage, catalysis, drug delivery, cell imaging, , and many more due to their inimitable structure and surface chemistry. − In recent times, CNPs have emerged as a new class of nanomaterial with significant prospects for addressing current challenges pertinent to environmental remediation, including contaminant removal , and heavy metal adsorption. , Eco-friendliness, cost-effectiveness, nontoxic behavior, high surface area to volume, and tunable surface chemistries of CNPs may also be advantageous in mitigating environmental concerns instigated by toxic heavy metals. For instance, surface-functionalized CNPs showed enriched physicochemical properties, drug release, and biocompatibility along with long-term homogeneous dispersion …”