Organosilica Nanoparticles with an Intrinsic Secondary Amine: An Efficient and Reusable Adsorbent for Dyes

Chen, Fang; Zhao, Eric; Kim, Taeho; Wang, Junxin; Hableel, Ghanim; Reardon, Philip James Thomas; Jeevarathinam, Ananthakrishnan Soundaram; Wang, Tianyu; Arconada-Alvarez, Santiago; Knowles, Jonathan C.; Jokerst, Jesse V.

doi:10.1021/acsami.7b04181

Cited by 80 publications

(60 citation statements)

References 59 publications

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“…Higher ionic strength of the solution is obtained as the concentration of salts increases. Chen et al demonstrated the influence of ionic strength on the adsorption of PR dye by tuning the concentration of NaCl [49]. The results showed a decreased adsorption capacity upon increasing the ionic strength because the adsorption of charged moieties competed with that of dye molecules or adsorbents in the solution.…”

Section: Interaction Between Dye Molecules and Photocatalystsmentioning

confidence: 99%

Mechanistic Insights into Photodegradation of Organic Dyes Using Heterostructure Photocatalysts

et al. 2019

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Due to its low cost, environmentally friendly process, and lack of secondary contamination, the photodegradation of dyes is regarded as a promising technology for industrial wastewater treatment. This technology demonstrates the light-enhanced generation of charge carriers and reactive radicals that non-selectively degrade various organic dyes into water, CO2, and other organic compounds via direct photodegradation or a sensitization-mediated degradation process. The overall efficiency of the photocatalysis system is closely dependent upon operational parameters that govern the adsorption and photodegradation of dye molecules, including the initial dye concentration, pH of the solution, temperature of the reaction medium, and light intensity. Additionally, the charge-carrier properties of the photocatalyst strongly affect the generation of reactive species in the heterogeneous photodegradation and thereby dictate the photodegradation efficiency. Herein, this comprehensive review discusses the pseudo kinetics and mechanisms of the photodegradation reactions. The operational factors affecting the photodegradation of either cationic or anionic dye molecules, as well as the charge-carrier properties of the photocatalyst, are also fully explored. By further analyzing past works to clarify key active species for photodegradation reactions and optimal conditions, this review provides helpful guidelines that can be applied to foster the development of efficient photodegradation systems.

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Section: Interaction Between Dye Molecules and Photocatalystsmentioning

confidence: 99%

Mechanistic Insights into Photodegradation of Organic Dyes Using Heterostructure Photocatalysts

et al. 2019

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“…The equilibrium adsorption isotherm is commonly used to describe the adsorption properties, and various important parameters of the adsorbent can be obtained based on different adsorption models. In the present work, Langmuir and Freundlich models are used to simulate the equilibrium adsorption data . The linear expression of Langmuir and Freundlich equation is as follows:

\frac{C_{e}}{q_{e}} = \frac{C_{e}}{q_{m}} + \frac{1}{K_{L} q_{m}}

\log q_{e} = \log K_{F} + \frac{1}{n} \log C_{e}

where C e (mg L −1 ) is the equilibrium concentration of adsorbate in solution, q e (mg g −1 ) is the equilibrium adsorption capacity, q max (mg g −1 ) is the maximum adsorption capacity, and K L (L mg −1 ) is the adsorption equilibrium constant, which can be obtained from the intercept and the slope of the linear plot of C e / q e versus C e ; K F [(mg g −1 ) (L mg −1 ) 1/ n ] is the Freundlich constant, and 1/ n is the heterogeneity factor, whose value determines the ease of adsorption process.…”

Section: Resultsmentioning

confidence: 99%

Effect of neighboring groups on the pH responsive adsorption/desorption behaviors of carboxylate functionalized hollow polymer particles

Luo

Liang

Dong

et al. 2019

J. Polym. Sci. Part A: Polym. Chem.

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In this article, a serial of bi‐functionalized hollow polymer particles (BF‐HPPs), containing both carboxylate and different amide/amine groups [HPP‐NH2, HPP‐ethylenediamine (EDA), and HPP‐diethylenetriamine (DETA)], were specially designed and synthesized to investigate the effect of neighboring amino groups on their adsorption/desorption behavior. Due to the high density of carboxylate groups, these BF‐HPPs can serve as efficient adsorbents for selective removal of positively charged methylene blue (b‐MB). With increasing chain length of the neighboring amino groups, the maximum adsorption capacities (qmax) at pH 7 decrease dramatically from 606.1 mg g−1 for HPP‐NH2, to 404.9 mg g−1 for HPP‐EDA, and 332.2 mg g−1 for HPP‐DETA, due to increasing steric hindrance. Significantly, the equilibrium adsorption can be achieved within 15 min for HPP‐EDA and HPP‐DETA, while it takes more than 720 min for HPP‐NH2. Moreover, the qmax of HPP‐DETA exhibits remarkable pH‐sensitive property, which decreases sharply to 32.7 mg g−1 at pH 3 due to strong electrostatic repulsion between positively charged ammonium groups and b‐MB molecules. Accordingly, the desorption efficiency of HPP‐DETA reached up to 94% after one desorption step, which is much higher than that of HPP‐EDA (78%) and HPP‐NH2 (60%). The absorbed b‐MB can be facilely desorbed and the adsorption capacity of the regenerated HPP‐DETA keeps above 95% after five consecutive adsorption–desorption cycles. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 1404–1413

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“…Several studies demonstrate how these properties can be controlled, aiming to remediate different types of contaminants with relative success. [9][10][11] Sugarcane waste ash can be utilized to generate silica nanoparticles (SiO 2 NPs) in the presence of cetyltrimethylammonium bromide (CTAB), 12 as previously demonstrated by our group; however, in this article the synthesis of bare silica nanoparticles without the presence of stabilizers is described. Nanoparticles without stabilizers have more applications due to the fact that they can be modified as needed, avoiding the problems generated by previously modified molecules, since removing molecules from the surface of nanoparticles in general, can cause destabilization or incompletion.…”

Section: Introductionmentioning

confidence: 95%

An Alternative and Simple Method for the Preparation of Bare Silica Nanoparticles Using Sugarcane Waste Ash, an Abundant and Despised Residue in the Brazilian Industry

Rovani¹,

Santos²,

Cório³

et al. 2019

J. Braz. Chem. Soc.

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Sugarcane waste ash, a Si-rich waste product, is generated in large quantities and creates a serious disposal problem in the Brazilian ethanol-sugar industry, affecting the environment and public health. Here, a simple method capable of generating bare silica nanoparticles utilizing this residue is demonstrated. Firstly, the crystalline silica present in sugarcane waste ash (SWA) was converted into amorphous by melting a mixture of sodium hydroxide and SWA at 550 °C for 1 h. The silica nanoparticles (SiO 2 NPs) were formed by lowing pH. This production process of SiO 2 NPs from SWA was optimized varying the ash:NaOH mass ratio, increasing the silica extraction up to 96%. The sample's composition was characterized by total X-ray fluorescence spectroscopy, morphology and physical-chemical properties were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction, specific surface area measurements, Fourier-transform infrared spectroscopy (FTIR) and thermogravimetric analyses (TGA), followed by use as adsorbent for the removal of methylene blue dye. With this process of extraction, nanoparticles smaller than 100 nm were generated, with a surface area of 63 m 2 g-1 and a maximum adsorption capacity of 37 mg g-1 for methylene blue. The results indicate a successful process for obtaining an adsorbent from an industrial waste product using a cost effective and rapid synthesis procedure rendering renewable product.

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Organosilica Nanoparticles with an Intrinsic Secondary Amine: An Efficient and Reusable Adsorbent for Dyes

Cited by 80 publications

References 59 publications

Mechanistic Insights into Photodegradation of Organic Dyes Using Heterostructure Photocatalysts

Mechanistic Insights into Photodegradation of Organic Dyes Using Heterostructure Photocatalysts

Effect of neighboring groups on the pH responsive adsorption/desorption behaviors of carboxylate functionalized hollow polymer particles

An Alternative and Simple Method for the Preparation of Bare Silica Nanoparticles Using Sugarcane Waste Ash, an Abundant and Despised Residue in the Brazilian Industry

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