pH-dependent adsorption of α-amino acids, lysine, glutamic acid, serine and glycine, on TiO2 nanoparticle surfaces

Ustunol, Irem B.; Gonzalez‐Pech, Natalia I.; Grassian, Vicki H.

doi:10.1016/j.jcis.2019.06.086

Cited by 67 publications

(46 citation statements)

References 72 publications

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“…One of the critical variables that affect the adsorption process is the initial pH of solution since it affects the surface charge of adsorbent and adsorbate 30 . Figure 4a shows the effect of initial pH value on the adsorption efficiency of CuGA 90-2.2 for MB and CR removal.…”

Section: Effect Of Ph On the Adsorption Of Dye By Cuga 90-22mentioning

confidence: 99%

Aqueous synthesis of highly adsorptive copper–gallic acid metal–organic framework

Azhar

Angkawijaya

Santoso

et al. 2020

Sci Rep

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A greener route to synthesize mesoporous copper–gallic acid metal–organic framework (CuGA MOF) than the conventional method using harmful DMF solvent was proposed in this study. Various synthesis attempts were conducted by modifying the synthesis conditions to produce CuGA MOF with comparable physical properties to a reference material (DMF-synthesized CuGA NMOF). The independent variables investigated include the molar ratio of NaOH to GA (1.1 to 4.4) and the synthesis temperature (30, 60, 90 °C). It was found that proper NaOH addition was crucial for suppressing the generation of copper oxide while maximizing the formation of CuGA MOF. On the other hand, the reaction temperature mainly affected the stability and adsorption potential of CuGA MOF. Reacting Cu, GA, and NaOH at a molar ratio of 1:1:2.2 and a temperature of 90 °C, produced mesoporous MOF (CuGA 90–2.2) with a surface area of 198.22 m2/g, a pore diameter of 8.6 nm, and a thermal stability of 219 °C. This MOF exhibited an excellent adsorption capacity for the removal of methylene blue (124.64 mg/g) and congo red (344.54 mg/g). The potential usage of CuGA 90–2.2 as a reusable adsorbent was demonstrated by its high adsorption efficiency (> 90%) after 5 adsorption–desorption cycles.

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Section: Effect Of Ph On the Adsorption Of Dye By Cuga 90-22mentioning

confidence: 99%

Aqueous synthesis of highly adsorptive copper–gallic acid metal–organic framework

Azhar

Angkawijaya

Santoso

et al. 2020

Sci Rep

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“…It is well known that the preparation of samples for the measurements may have an impact on the spectral information obtained. Many parameters determine the relative intensity of the specified bands in the vibrational spectrum, i.e., the state of the sample condition [ 65 ], solvent effect [ 66 ], and pH of the solution [ 15 , 66 , 67 ]. For this reason, the same sample preparation procedure was applied in all spectroscopic experiments.…”

Section: Resultsmentioning

confidence: 99%

“…However, Begonja et al [ 77 ] observed this band and proposed that the amino group plays a significant role in the n process adsorption of cysteine onto the metallic surface. In addition, Ustunol et al [ 15 ] observed that the protonated surface species of amino acids adsorbed onto metallic surface under acidic conditions. The significant enhancement of band at 1744 cm − 1 (Δῡ = 21 cm − 1 , FWHM = 45 cm − 1 ) due to –C=O stretching vibrations in comparison to FT-IR spectrum of Thr ( Figure 4 a) indicated the presence of carbonyl group in close proximity to the CuNPs-Fe surface.…”

Section: Resultsmentioning

confidence: 99%

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Micro- and Nanoscale Spectroscopic Investigations of Threonine Influence on the Corrosion Process of the Modified Fe Surface by Cu Nanoparticles

et al. 2020

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The work presents a comprehensive vibrational analysis of the process of adsorption of threonine (Thr) onto an Fe surface with deposited Cu nanoparticles (NPs) (of about 4–5 nm in size) in a corrosive environment. The application of surface-enhanced Raman spectroscopy (SERS) and surface-enhanced infrared absorption spectroscopy (SEIRA) provides the opportunity for detailed description of adsorption geometry of amino acid onto a metal surface. The combination of conventional infrared spectroscopy (IR) with atomic force microscopy (AFM) resulted in a nano-SEIRA technique which made it possible to provide a precise description of adsorbate binding to the metal surface. The studies presented confirmed that there is a very good correlation between the spectra recorded by the SERS, SEIRA, and nano-SEIRA techniques. Threonine significantly influenced the process of corrosion of the investigated surface due to the existing strong interaction between the protonated amine and carboxylate groups and the CuNPs deposited onto the Fe surface. In addition, the application of two polarization modulations (s and p) in nano-SEIRA allows subtle changes to be observed in the molecule geometry upon adsorption, with the carboxylate group of Thr being almost horizontally oriented onto the metal surface; whereas the amine group that contains nitrogen is oriented perpendicular to this surface.

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“…The application of advanced characterization methods (SEC and QTOF MS) enabled fundamental insights into the role of the adsorbed NOM (as opposed to bulk NOM) and mechanisms for the substrate to influence NOM adsorption to the TiO2, as well as the influence of the NOM on the DEET byproduct formation pathways. As a number of biomolecules, such as proteins and amino acids, can also adsorb to TiO2, [48][49][50][51][52][53] the generalizability of the results for NOM to other coatings or the influence of the substrate on competitive adsorption processes 27,52 can also be interesting to investigate in future studies.…”

Section: Discussionmentioning

confidence: 99%

DEET Degradation by Titanium Dioxide–Zeolite Nanocomposites: Effects of Aggregation State, Water Chemistry, and Natural Organic Matter

Berté¹,

Chen²,

Mathew³

et al. 2020

Preprint

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Immobilization of titanium dioxide nanoparticles (TiO2 NPs) facilitates their removal and reuse in water treatment applications. Composite materials of electrostatically-bound TiO2 NPs and zeolite particles have been proposed, but limited mechanistic studies are available on their performance in complex media. This study delineates the relative importance of homo- and heteroaggregation, water chemistry, and surface fouling by natural organic matter (NOM) on the photocatalytic degradation of diethyltoluamide (DEET) by TiO2-zeolite composites. Zeolite adsorbs a portion of the DEET, rendering it unavailable for degradation; corrections for this adsorption depletion allowed appropriate comparison of the reactivity of the composites to the NPs alone. The TiO2-zeolite composites showed enhanced DEET degradation in moderately hard water (MHW) compared to deionized water (DIW), likely attributable to the influence of HCO3−, whereas a net decline in reactivity was observed for the TiO2 NPs alone upon homoaggregation in MHW. The composites also better maintained reactivity in the presence of NOM in MHW, as removal of Ca2+ onto the zeolite mitigated fouling of the TiO2 surface by NOM. However, NOM induced partial dissociation of the composites. DEET byproduct formation, identified by quadrupole–time of flight (QTOF) mass spectrometry, was generally unaffected by the zeolite, while NOM fouling favored de-ethylation over hydroxylation products. Overall, the most significant factor influencing TiO2 reactivity toward DEET was NOM adsorption, followed by homoaggregation, electrolytes (here, MHW versus DIW), and heteroaggregation. These findings can inform a better understanding of NP reactivity in engineered water treatment applications.

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pH-dependent adsorption of α-amino acids, lysine, glutamic acid, serine and glycine, on TiO2 nanoparticle surfaces

Cited by 67 publications

References 72 publications

Aqueous synthesis of highly adsorptive copper–gallic acid metal–organic framework

Aqueous synthesis of highly adsorptive copper–gallic acid metal–organic framework

Micro- and Nanoscale Spectroscopic Investigations of Threonine Influence on the Corrosion Process of the Modified Fe Surface by Cu Nanoparticles

DEET Degradation by Titanium Dioxide–Zeolite Nanocomposites: Effects of Aggregation State, Water Chemistry, and Natural Organic Matter

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