Pistachio shell powder supported nano-zerovalent copper (ZVC@PS) material prepared by borohydride reduction, was characterized using SEM, FTIR, XRD, TGA/DTA, BET, and XPS. SEM, XRD, and XPS revealed the nanozerovalent copper to consist of a core-shell structure with CuO shell and Cu(0) core with a particle size of 40-100 nm and spherical morphology aggregated on PS biomass. ZVC@PS was found out to contain 39% (w/w %) Cu onto the pistachio shell biomass. Batch sorption of Cr(VI) from the aqueous using ZVC@PS were studied, and was optimized for dose (0.1-0.5 g/L), initial Cr(VI) concentration(1-20 mg/L) and pH (2-12). Optimized conditions were 0.1 g/L doses of sorbent and pH=3 for Cr(VI) adsorption. Langmuir and Freundlich adsorption isotherm models fitted well to the adsorption behavior of ZVC@PS for Cr(VI) with a pseudo-second-order kinetic behavior.ZVC@PS (0.1g/L) exhibits qmax for Cr(VI) removal up to 111.1 mg/g. XPS and other spectroscopic evidence suggest the adsorption of Cr(VI) by pistachio shell powder, coupled with reductive conversion of Cr(VI) to Cr(III) by ZVC particles to produce a synergistic effect for the efficient remediation of Cr(VI) from aqueous medium.
a b s t r a c tThe surfaces of bio magnetite nanoparticles were functionalized with 3-Mercaptopropionic acid (3 MPA) and used as a high-capacity and recyclable adsorbent for the rapid removal of Ni(II) from aqueous solution. The 3 MPA@Fe 3 O 4 MNPs were characterized by Fourier transformed infrared analysis (FT-IR), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS) and vibrating sample magnetometer (VSM) analysis. This 3 MPA@Fe 3 O 4 MNPs have been used for removal of Ni(II) from aqueous solution. The hysteresis loops of 3 MPA@Fe 3 O 4 MNPs shows an excellent ferromagnetic behavior with saturation magnetization value of 14.02 emu/g. The adsorption isotherm data were fitted well to Langmuir isotherm, the monolayer adsorption capacity was found to be 42.01 mg/g at 303 K. The experimental kinetic data fitted very well the pseudo-second-order model.The results indicate that the biogenic 3 MPA@Fe 3 O 4 MNPs act as significant adsorbent material for removal of Ni(II) aqueous solution and also considered as a potential adsorbent for hazardous metal ions from wastewater.
Cotton production substantiated a crucial part in the escalating economic development of many countries. To realize the increasing global demand for cotton, the emphasis should be laid on to improve cotton fiber growth and production. The bioengineered transgenic cotton proved expedient in resolving inadequacies of conventional cotton, but still required improvements to encounter heightened demand of textile industries. One possible solution pertaining to this has been provided by nanoscience in the form of metal or metal oxide nanoparticles. These metal oxide nanoparticles have easy access to the various parts of cotton plants through its transportation system, and thus significantly influence several parameters relative to the growth and production of cotton fiber. This review summarizes the distribution and accumulation of metal oxide nanoparticles in cotton plant and its impact on different plant growth-promoting factors, which resulted in the improved cotton yields.
Graphical abstract
Metal/metal-oxide nanoparticles have easy access to the various parts of cotton plant through its transportation system, and thus significantly influence its growth parameters, and hence the production of cotton fiber. This review summarizes the distribution and accumulation of metal oxide nanoparticles in cotton plants, and its impact on different plant growth promoting factors.
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