Microwave induced carboxylation of nanodiamonds

Desai, C. M.; Mitra, Somenath

doi:10.1016/j.diamond.2013.02.005

Cited by 16 publications

(9 citation statements)

References 45 publications

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“…More specifically, this signal is given by the dimeric form of the carboxylic acid as a result of the formation of hydrogen bonds between the oxygenated groups. Similar examples can be found in the literature .…”

Section: Resultssupporting

confidence: 78%

Recovery of Co from aqueous solutions using nanodiamonds as solid adsorbents

Reina

Peruzzi

Orlanducci

et al. 2016

Physica Status Solidi (a)

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A study has been carried out to test detonation nanodiamond (DND) as solid adsorbent for the recovery of Co ions from wastewater. With the aim to enhance the surface affinity for Co ions, after preliminary purification and oxidation steps, the DNDs were functionalized with three different diamine chelant molecules. The as prepared materials were characterized via FT‐IR and TGA. Finally, the Co adsorption capacity of DND was obtained by quantifying, by means of UV‐Vis spectroscopy, the residual concentration of Co ions in the solutions. Playing with the surface chemistry of DND it was possible to strongly enhance the DND uptake of cobalt ions, up to a value of about 60%. The proposed process offers flexibility in design and operation and the proper functionalized DNDs demonstrated to be effective solid adsorbent systems for metal recycling. Top left: cartoon of the amidation reaction of the DND surface; top right: thermogravimetric analysis of the pristine and functionalized DNDs; bottom left: scheme of the Co absorption experiments made with the various DNDs in the Co solution, bottom right: UV‐Vis spectra of the various Co standard solutions.

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Section: Resultssupporting

confidence: 78%

Recovery of Co from aqueous solutions using nanodiamonds as solid adsorbents

Reina

Peruzzi

Orlanducci

et al. 2016

Physica Status Solidi (a)

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“…pressure controls using a method published previously. 21 Commercially available DNDs were used as starting materials without further modication. A pre-weighed amount of DND was treated with 1 : 1 70% nitric acid and 97% sulfuric acid in microwave reaction vessels at 95% of a total of 1600 watts power, at a temperature setting of 75 C, and a reaction time of 1 h was used.…”

Section: Chemicalsmentioning

confidence: 99%

“…This led to the formation of carboxyl groups on the surface. 21 The resulting product referred to as DND-COOH was ltered through a 10 mm PTFE membrane lter, washed with water to a neutral pH and dried under vacuum at 80 C to a constant weight.…”

Section: Chemicalsmentioning

confidence: 99%

Aggregation behavior of nanodiamonds and their functionalized analogs in an aqueous environment

Desai

Chen

Mitra

2014

Environ. Sci.: Processes Impacts

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The colloidal behavior of aqueous dispersions of detonation nanodiamonds (DNDs) and carboxylated nanodiamonds (DND-COOH) which were synthesized via a microwave process is presented. Both forms of DNDs were found to be relatively stable in aqueous solutions, but aggregated rapidly in the presence of mono and divalent salts. The critical coagulation concentration (CCC) values for DNDs and DND-COOH were estimated to be between 8 and 10 mM for NaCl and 7 and 8 mM for MgCl2. In general, the formation of carboxyl groups on the DND surface did not alter colloidal behavior as dramatically as it is known to do for other nanocarbons especially carbon nanotubes.

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“…By comparing these results with previous findings ( Mitev et al, 2014a ), it becomes obvious that the oxygen moieties are not the only determining factor when the oxidative treatments are concerned. The ZP for DND is a combination of: the oxidised diamond surface, other heteroatom moieties, non-diamond carbon and (chemi)sorbed ions and compounds ( Desai and Mitra, 2013 ; Peristyy et al, 2017 ; Shenderova and Nunn, 2017 ; Aizawa, 2019 ), with variable “relative weight” in each case.…”

Section: Resultsmentioning

confidence: 99%

Plasma & Microwaves as Greener Options for Nanodiamond Purification: Insight Into Cytocompatibility

Mitev

Alsharabasy

Morrison

et al. 2021

Front. Bioeng. Biotechnol.

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The potential biomedical applications of nanodiamond have been considered over the last few decades. However, there is still uncertainty regarding the extent to which the surface characteristics of this material can influence potential applications. The present study investigated the effects of surface characteristics alongside the prospective of improving nanodiamond production using cold plasma and microwave technologies for the surface tailoring of the nanocarbons. Numerous approaches were applied to purify, refine and modify a group of nanosized diamonds at each step of their production cycle: from the detonation soot as the initial raw material to already certified samples. The degree of surface changes were deliberately performed slowly and kept at different non-diamond carbon presence stages, non-carbon elemental content, and amount converted superficial moieties. In total, 21 treatment procedures and 35 types of nanosize diamond products were investigated. In addition cultures of human fibroblast cells showed enhanced viability in the presence of many of the processed nanodiamonds, indicating the potential for dermal applications of these remarkable nanomaterials.

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Microwave induced carboxylation of nanodiamonds

Cited by 16 publications

References 45 publications

Recovery of Co from aqueous solutions using nanodiamonds as solid adsorbents

Recovery of Co from aqueous solutions using nanodiamonds as solid adsorbents

Aggregation behavior of nanodiamonds and their functionalized analogs in an aqueous environment

Plasma & Microwaves as Greener Options for Nanodiamond Purification: Insight Into Cytocompatibility

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