Adsorption of methylene blue using sodium carboxymethyl cellulose-g-poly (acrylamide-co-methacrylic acid)/Cloisite 30B nanocomposite hydrogel

Khatooni, Hamzeh; Peighambardoust, Seyed Jamaleddin; Foroutan, Rauf; Mohammadi, Réza; Ramavandi, Bahman

doi:10.1007/s10924-022-02623-x

Cited by 94 publications

(12 citation statements)

References 57 publications

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“…As can be seen, the values of Qe (cal.) (Table 5) were in reasonable agreement with the experimental ones (Table 3), thus establishing that the diffusion stage within the particle was not involved in the mechanism of the adsorption process [31]. * Computed from the slopes of the equations of calibration models; ** computed from the intercepts of equations of calibration models [27].…”

Section: Resins R1 and R2 And Related Hydrogels R1hg And R2hgsupporting

confidence: 74%

“…The values of K2 established that R2 was able to remove nitrite remarkably faster than R1, and the calculated values of Qe perfectly agreed with the experimental ones, thus establishing that the diffusion stage within the particle was not involved in the mechanism of the adsorption process [31].…”

Section: Kinetic Studiessupporting

confidence: 63%

“…These results established that although the saturation of R1HG and, consequently, the increase in nitrite concentration in effluents was mainly governed by diffusion (IPD kinetic model), that of R2HG involved chemical processes, such as the sharing or exchange of electrons between the adsorbent and the adsorbed or electrostatic interactions [27]. The maximum value of the concentration of nitrites not absorbed and still present in the filtered water (Q60) calculated for R2HG with the equation of the PSO kinetic model (Q60 cal = 0.28 mM) was in perfect agreement with experimental data (Q60 = 0.2720 mM), thus excluding diffusion mechanisms [31].…”

Section: Saturation Kinetics Studiessupporting

confidence: 60%

“…In this context, CMC-g-Poly (MAA-co-Aam)/Cloisite 30B (Hyd/C30B) and poly (methacrylic acid-co-acrylamide)/Cloisite 30B nanocomposite (poly (MAA-co-Aam)/Cl30B) hydrogels have demonstrated high efficiency in adsorbing methylene blue (MB) dye from wastewater samples [30,31]. Additionally, a recent paper reported the immobilization of hybrid gold-cesium nanoparticles (Au-Cs NPs) onto a magnesium ferrite (MgFe 2 O 4 ) surface and detailed the behavior of the prepared composites in N 2 adsorption-desorption experiments [32].…”

Section: Nitrite: a Water Pollutant That Needs To Be More Carefully P...mentioning

confidence: 99%

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Cationic Polystyrene-Based Hydrogels: Low-Cost and Regenerable Adsorbents to Electrostatically Remove Nitrites from Water

Alfei

Orlandi

Grasso

et al. 2023

Toxics

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Nitrites are metastable anions that are derived from the oxidation of ammonia by agricultural pollution, sewage, decaying protein, and other nitrogen sources. They are a recognized environmental issue due to their role in eutrophication, as well as in surface and groundwater contamination, being toxic to almost all living creatures. Recently, we reported on the high efficiency of two cationic resins (R1 and R2) forming hydrogels (R1HG and R2HG) by dispersion in water in removing anionic dyes from water by electrostatic binding. Here, aiming at developing adsorbent materials for nitrite remediation, R1, R2, R1HG, and R2HG were first tested in adsorption experiments in batches monitored by UV–Vis methods, using the Griess reagent system (GRS) in order to assess their removal efficiency by contact over time. Particularly, samples of water appositely contaminated with nitrites were analyzed by UV–Vis before and during treatment with the hydrogels. The initial concentration of nitrites was quantified (118 mg/L). Then, the removal of nitrites over time, the removal efficiency of R1HG (89.2%) and of R2HG (89.6%), their maximum adsorption (21.0 mg/g and 23.5 mg/g), as well as the adsorption kinetics and mechanisms were evaluated. Additionally, R1HG- and R2HG-based columns (h = 8–10 cm, ØE = 2 cm) mimicking mini-scale decontamination systems by filtration were used to rapidly filter samples of water polluted with nitrite that were under pressure. R1HG and R2GH were capable of totally removing nitrites (99.5% and 100%) from volumes of nitrite solutions that were 118 mg/L that is 10 times the volumes of resins used. Additionally, when extending filtration to increasing volumes of the same nitrite solution up to 60 times the volume of resins used, the removal efficiently of R1HG decreased, and that of R2HG remained stable at over 89%. Interestingly, both the worn-out hydrogels were regenerable by 1% HCl washing, without a significant reduction in their original efficiency. There is a lack of studies in the literature reporting on novel methods to remove nitrite from water. R1HG and especially R2HG represent low-cost, up-scalable, and regenerable column-packing materials with promise for applications in the treatment of drinking water contaminated by nitrites.

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Section: Resins R1 and R2 And Related Hydrogels R1hg And R2hgsupporting

confidence: 74%

Section: Kinetic Studiessupporting

confidence: 63%

Section: Saturation Kinetics Studiessupporting

confidence: 60%

Section: Nitrite: a Water Pollutant That Needs To Be More Carefully P...mentioning

confidence: 99%

See 2 more Smart Citations

Cationic Polystyrene-Based Hydrogels: Low-Cost and Regenerable Adsorbents to Electrostatically Remove Nitrites from Water

Alfei

Orlandi

Grasso

et al. 2023

Toxics

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“…Only for the uptake of Cu 2+ a reduction in the uptake performance is observed (128.0 mg·g –1 for HyMZ vs 164.8 mg·g –1 for HyPhi). For HyMZ, the total release efficiency values are 86.4% for methylene blue, 94.4% for Solvent Yellow 14, and 98.4% for Cu 2+ (Figure S5), showing that our system can compete with the literature. − …”

Section: Resultsmentioning

confidence: 81%

Activatable Multizone Hybrid Hydrogels Containing Porous Organosilica Nanoparticles as Gatekeepers

Kollofrath,

Krysiak,

Polarz

2023

Chem. Mater.

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Because the supply of clean water is one of the biggest challenges that we already face today, it is becoming increasingly important to develop smart strategies to purify sewage. Every wastewater is different and typically contains a large number of different contaminations. Adsorbents with a high surface area represent a powerful way to remove such compounds from a liquid. But, there are also several problems. An unselective adsorbent will bind everything and thus become a hazardous waste itself. If the adsorbent is selective, then several adsorbents are needed to treat the wastewater and achieve sufficient purification. The idea of the current paper is to develop a material that is capable of the uptake of different contaminants from a mixture; it then automatically separates in a multizone-structure. The impurities can be removed separately, step by step, by recycling the materials. Porous vinyl-functionalized organosilica nanoparticles are the key to creating the required anisotropy in selectivity when used as cross-linkers in hydrogels formed by a thermoresponsive polymer. The tailor-made functionalization of the pore surfaces allows for precise tuning of the host−guest interactions. It is shown that the presence of porous particles is a crucial factor for mass transport. The distance between them can be controlled by temperature-induced switching of the polymer from the swollen to the collapsed state. The smaller the distance between the porous particles, the more interparticle mass transport occurs. The correlating active pump effect, in combination with the multizone structure, allows switching separation on and off. The materials presented herein can be considered to be a model for a new generation of chromatography materials with variable and externally controllable separation properties.

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Adsorption studies of organic azo dyes from their aqueous solutions by a pH sensitive sodium alginate‐cl‐poly (N‐hydroxyethyl acrylamide‐co‐methacrylic acid) @Au/ montmorillonite nanocomposite hydrogel

Samanta,

Adak,

Tripathy

2024

J of Applied Polymer Sci

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A pH responsive monometallic‐clay nanocomposite hydrogel, sodium alginate‐cl‐poly (N‐hydroxy ethyl acrylamide‐co‐methacrylic acid) @ Au/ montmorillonite clay (SANCHG@Au/MMT) is synthesized in situ using sodium alginate (SA) as a polysaccharide. Two other nano composite hydrogels namely sodium alginate‐cl‐poly (N‐hydroxy ethyl acrylamide‐co‐methacrylic acid) @ Au (SANCHG@Au) and sodium alginate‐cl‐poly (N‐hydroxy ethyl acrylamide‐co‐methacrylic acid) @ montmorillonite clay (SANCHG@MMT) are also prepared. All the synthesized nano composite hydrogels are characterized using various techniques. Water swelling of the three hydrogels along with their textile dye adsorption properties is evaluated in congo red (CR), benzopurpurin (BP) and tartrazine (TZ) from their aqueous solutions. Among the three hydrogels the % water swelling of SANCHG@Au/MMT is superior (396% at pH = 8) and also the adsorption capacity over the other two. The dye adsorption property of SANCHG@Au/MMT is found to be pH sensitive. Adsorption follows both the Langmuir adsorption isotherm with Qmax values 512.19 mg.g−1 for CR at pH = 4, 476.09 mg.g−1 at pH = 4 for BP and 454.79 mg.g−1 at pH = 6 for TZ respectively and Dubinin–Radushkevich isotherm model. The kinetic data fit with pseudo second order kinetic model. Thermodynamic parameters like negative and positive values suggest that the adsorption process is spontaneous and endothermic in nature.

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Adsorption of methylene blue using sodium carboxymethyl cellulose-g-poly (acrylamide-co-methacrylic acid)/Cloisite 30B nanocomposite hydrogel

Cited by 94 publications

References 57 publications

Cationic Polystyrene-Based Hydrogels: Low-Cost and Regenerable Adsorbents to Electrostatically Remove Nitrites from Water

Cationic Polystyrene-Based Hydrogels: Low-Cost and Regenerable Adsorbents to Electrostatically Remove Nitrites from Water

Activatable Multizone Hybrid Hydrogels Containing Porous Organosilica Nanoparticles as Gatekeepers

Adsorption studies of organic azo dyes from their aqueous solutions by a pH sensitive sodium alginate‐cl‐poly (N‐hydroxyethyl acrylamide‐co‐methacrylic acid) @Au/ montmorillonite nanocomposite hydrogel

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