Production of COx-Free Hydrogen and Few-Layer Graphene Nanoplatelets by Catalytic Decomposition of Methane over Ni-Lignin-Derived Nanoparticles

Nickel (Ni)-lignin nanocomposites were synthesized from nickel nitrate and kraft lignin then catalytically graphitized to few-layer graphene-encapsulated nickel nanoparticles (Ni@G). Ni@G nanoparticles were used for catalytic decomposition of methane (CDM) to produce COx-free hydrogen and graphene nanoplatelets. Ni@G showed high catalytic activity for methane decomposition at temperatures of 800 to 900 °C and exhibited long-term stability of 600 min time-on-stream (TOS) without apparent deactivation. The catalytic stability may be attributed to the nickel dispersion in the Ni@G sample. During the CDM reaction process, graphene shells over Ni@G nanoparticles were cracked and peeled off the nickel cores at high temperature. Both the exposed nickel nanoparticles and the cracked graphene shells may participate the CDM reaction, making Ni@G samples highly active for CDM reaction. The vacancy defects and edges in the cracked graphene shells serve as the active sites for methane decomposition. The edges are continuously regenerated by methane molecules through CDM reaction.

Anti-breast carcinoma effects of green synthesized nickel nanoparticles from Alhagi ‎sparsifolia leaf aqueous extract: A pre-clinical trial study ‎

IntroductionMany nanoparticles have pharmacological and biochemical properties, including antioxidant and anti-‎inflammatory properties, which appear to be involved in anticarcinogenic and antimutagenic activities. In the recent study, nickel nanoparticles were green-synthesized using the Alhagi sparsifolia leaf aqueous ‎extract. ‎Material and methodsThe synthesized Ni nanoparticles‎ were characterized by analytical techniques including SEM, UV-Vis., and FT-‎IR. The nanoparticles were formed in a spherical shape in the average size of 16.19 nm. ‎ResultsIn the antioxidant test, the IC50 of Ni nanoparticles‎ and BHT against DPPH free radicals were 316 and 231 ‎‎µg/mL, respectively. In the cellular and molecular part of the recent study, the treated cells with Ni ‎nanoparticles‎ were assessed by MTT assay for 48h about the cytotoxicity and anti-human breast cancer ‎properties on normal (HUVEC) and breast cancer cell lines i.e. lobular carcinoma of breast (UACC-3133), ‎inflammatory carcinoma of the breast (UACC-732), and metastatic carcinoma (MDA-MB-453). The viability of ‎malignant breast cell line reduced dose-dependently in the presence of Ni nanoparticles‎. The IC50 of Ni ‎nanoparticles‎ were 477, 548, and 605 µg/mL against lobular carcinoma of breast (UACC-3133), inflammatory ‎carcinoma of the breast (UACC-732), and metastatic carcinoma (MDA-MB-453) cell lines, respectively. ‎ConclusionsAfter clinical study, nickel nanoparticles containing Alhagi sparsifolia leaf aqueous extract may be used to ‎formulate a new chemotherapeutic drug or supplement to treat the several types of human breast cancer. ‎

Study on the mechanism of mitochondrial division and mitochondrial autophagy in the male reproductive toxicity induced by nickel nanoparticles

Male reproductive health is deteriorating, and fertility is largely affected by environmental factors. This study aims to investigate the potential mechanism underlying mitochondrial division and mitochondrial autophagy in the male...

REDUCTIVE ALKYLATION OF NITRILES WITH CARBONYL COMPOUNDS IN THE PRESENCE OF NANOSTUCTURED SUPPORTED NICKEL CATALYST

Reductive alkylation of nitriles with aldehydes and ketones using nickel nanoparticles supported on NaX zeolite as catalyst proceeds at 140-200 °C with the formation of the corresponding secondary and tertiary amines in 46-80 % yields.

ALKYLATION OF 2-AMINOADAMANTANE WITH ALKANOLS USING CATALYSIS BY COLLOIDAL NICKEL PARTICLES

The alkylation of 2-aminoadamantane with alkanols catalysed by quasi-homogenous catalysis by nickel nanoparticles proceeds at 140-160 ºС with foundation of secondary amines with 57-78 % yields.