Pyridinic N anchored Ag and Au hybrids for detoxification of organic pollutants
Por:
Bogireddy, Naveen Kumar Reddy, El Hachimi, Abdel Ghafour, Mejia, Yetzin Rodriguez, Kesarla, Mohan Kumar, Varma, Rajender S., Becerra, Raul Herrera, Agarwal, Vivechana
Publicada:
8 sep 2022
Resumen:
The development of a highly reusable, non-toxic catalyst for the
effective removal of 4-nitrophenol (4-NP) from marine water is a key
challenge due to its diverse effects on living organisms. Herein, in
situ green fabricated pyridinic N anchored Ag2O/Au decorated porous
silica (CG-Ag2O/Au-SiO2) using spent coffee grounds (CG) powder is
introduced as a reusable catalyst to mitigate 4-NP, Methylene blue (MB),
Rhodamine 6G (R6G) and their mixture in the spiked deionized, river and
marine water samples. Exceptionally high structural activity and
excellent reusability of catalysts up to 15 cycles have been
demonstrated due to the accessibility of a large number of active sites
from pyridinic N-anchored Ag2O and Au particle surfaces. CG-Ag2O/Au-SiO2
with the lower Ag and Au contents of 0.59 and 0.11 wt% (ICP-MS) of
active catalytic sites exhibit a superior activity parameter of 6000
s(-1) g(-1) (4-NP), 6357 s(-1) g(-1) {MB), and 2892 s(-1)g(-1) (R6G)
than chemically synthesized and reported, bare and hybrid structures.
Furthermore, the CG-Ag2O/Au-SiO2 shows excellent stability in marine
water with promising reusability performance {approximate to 93% after
15 successive cycles). Density functional theory (DFT) studies reveal
that the observed high catalytic efficiency originates from the
pyridinic N presence on the Ag2O/Au structures.
Filiaciones:
Bogireddy, Naveen Kumar Reddy:
Natl Autonomous Univ Mexico UNAM, Inst Phys, Mexico City 04510, DF, Mexico
El Hachimi, Abdel Ghafour:
Univ Autonoma Estado Morelos, Ctr Invest Quim, Cuernavaca 62210, Morelos, Mexico
Mejia, Yetzin Rodriguez:
Autonomous Univ State Mexico, Fac Chem, Paseo Colon Paseo Tollocan S-N, Toluca 50120, Mexico State, Mexico
Kesarla, Mohan Kumar:
Univ Nacl Autonoma Mexico, Inst Phys Sci, Cuernavaca 62210, Morelos, Mexico
Varma, Rajender S.:
Palacky Univ Olomouc, Czech Adv Technol & Res Inst, Reg Ctr Adv Technol & Mat, Slechtitelu 27, Olomouc 78371, Czech Republic
Becerra, Raul Herrera:
Natl Autonomous Univ Mexico UNAM, Inst Phys, Mexico City 04510, DF, Mexico
Agarwal, Vivechana:
Autonomous Univ State Morelos UAEM, Res Ctr Engn & Appl Sci, Univ Av 1001, Cuernavaca 62209, Morelos, Mexico
gold, Gold
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