Activated carbon impregnation with ag and cu composed nanoparticles for escherichia coli contaminated water treatment

Abstract

This study aimed to produce modified granular activated carbon (GAC) by low concentrations of silver (Ag) and/or copper (Cu) nanoparticles with antibacterial capacity for application in water purification. Modified porous materials were produced from the vacuum impregnation method, at the concentrations (mass of metal/mass of activated carbon) of Ag 8 x 10−4 g/g (Ag 0.08 %), Cu 1 x 10−2 g/g (Cu 1 %), and Ag 8 x 10−4 g/g + Cu 1 x 10−2 g/g (Ag 0.08 % Cu 1 %). The reduction of the metal salts in NPs of Ag and Cu in their metallic forms or oxides was carried out by the thermal decomposition method. The characterization of the produced porous material was performed by x‐ray diffraction, programmed temperature reduction, scanning electron microscopy, x‐ray dispersive energy spectroscopy, electron transmission microscopy, and specific surface area measurements: Brunauer, Emmet, and Teller; micropore area (t method); pore size distribution (DA method); and volume and diameter of micropores (HK method) and mesopores (BJH method). In the structure of the material produced, Ag and Cu metal compounds and AgO and CuO oxides were identified, with average crystallite sizes of < 60 nm. The efficiency of the inactivation of Escherichia coli was more significant in the GAC modified with the combination of NPs (GAC/NP‐AgCu) (6.4 log 10 units), evidencing the synergistic effect of the metals when compared to GAC/NP‐Ag (0.56 log10 units) and GAC/NP‐Cu (1.31 log10 units) modified porous material. Thus, these antibacterial materials can be used for application in water purification, improving the bacteriological quality of water intended for human consumption, noting that the low concentration of metals used can provide exceptional process efficiency.

Activated carbon loaded with manganese and iron for glyphosate adsorption: Kinetics, isotherms and thermodynamic studies

“…In the corresponding EDX spectrum, Table 1, the elemental composition of GAC can be observed with the presence of carbon, oxygen, and some elements such as aluminum, silica and chlorine, were also identified in studies reported by other authors (Giri et al, 2012;Haro et al, 2012;Mohan et al, 2011;Qu et al, 2009). In the EDX spectra of GAC/Mn/Fe, the presence of Mn and Fe was also observed, in addition to signs referring to the elements commonly present in GAC samples of vegetable origin (Arakawa et al, 2019b).…”

Evaluation of the electrochemical performance of Ag containing AAO layers after extended exposure to a model corrosive medium

“…Figure 1 presents a schematic illustration of localized MIC on aluminum alloy, according to the concepts described in [14]. [14] The beneficial properties of silver and its ions are not limited only to their confirmed bactericide properties, recently widely investigated [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. Materials, containing this element possess also definitively catalytic [41][42][43] and photocatalytic [44][45][46][47][48][49][50][51][52][53][54][55][56][57] properties.…”

Utilização De Adsorventes Para Remoção De Compostos Farmacêuticos No Tratamento De Água: Uma Revisão

“…Dentre os adsorventes mais utilizados no mercado hoje, podemos citar as argilas, o carvão ativado, óxido de grafeno e algumas partes de plantas ou outros materiais com alto teor de carbono, como resíduos de frutas e biomassas. E de acordo com Arakawa et al (2019), nanopartículas compostas por elementos como prata (Ag), zinco (Zn), níquel (Ni), ferro (Fe) e platina (Pt) têm atividade antibacteriana e pode ser usado em diversas áreas, como o campo médico, processamento de alimentos, catálise e tratamento de água.…”