Mesoporous silica MCM-41, SBA-15 and derived bridged polysilsesquioxane SBA-PMDA for the selective removal of textile reactive dyes from wastewater

Khan, Asif Jamal; Song, Jinxi; Kettab, Ahmed; Rahim, Abdur; Volpe, Pedro L. O.; Rehman, Fozia

doi:10.1016/j.molliq.2019.111957

Cited by 33 publications

(22 citation statements)

References 45 publications

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“…The inorganic framework of [SiO 1.5 ] affords this polysilsesquioxane good thermal stability, solvent resistance and biocompatibility. Therefore, bridged polysilsesquioxanes can serve as excellent carriers [ 39 ] and are potential candidates for widespread applications, including delivery systems [ 40 , 41 , 42 ], photoelectric sensors [ 43 , 44 ], molecular recognition [ 45 , 46 ], and adsorbents [ 47 ].…”

Section: Introductionmentioning

confidence: 99%

Precise Controlled Target Molecule Release through Light-Triggered Charge Reversal Bridged Polysilsesquioxane Nanoparticles

Zhang

et al. 2021

Polymers

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Precise control of target molecule release time, site, and dosage remains a challenge in controlled release systems. We employed a photoresponsive molecule release system via light-triggered charge reversal nanoparticles to achieve a triggered, stepwise, and precise controlled release platform. This release system was based on photocleavage-bridged polysilsesquioxane nanoparticles which acted as nanocarriers of doxorubicin loaded on the surface via electrostatic interaction. The nanoparticles could reverse into positive charges triggered by 254 nm light irradiation due to the photocleavage of the o-nitrobenzyl bridged segment. The charge reversal property of the nanoparticles could release loaded molecules. Doxorubicin was selected as a positively charged model molecule. The as-prepared nanoparticles with an average size of 124 nm had an acceptable doxorubicin loading content up to 12.8%. The surface charge of the nanoparticles could rapidly reverse from negative (−28.20 mV) to positive (+18.9 mV) upon light irradiation for only 10 min. In vitro release experiments showed a cumulative release up to 96% with continuously enhancing irradiation intensity. By regulating irradiation parameters, precisely controlled drug release was carried out. The typical “stepped” profile could be accurately controlled in an on/off irradiation mode. This approach provides an ideal light-triggered molecule release system for location, timing, and dosage. This updated controlled release system, triggered by near-infrared or infrared light, will have greater potential applications in biomedical technology.

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Section: Introductionmentioning

confidence: 99%

Precise Controlled Target Molecule Release through Light-Triggered Charge Reversal Bridged Polysilsesquioxane Nanoparticles

Zhang

et al. 2021

Polymers

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“…Among the materials applied to adsorb dye compounds from wastewater, hexagonal mesoporous silica attracted more attention for their relatively high adsorption capacity, shorter equilibrium time, abundant surface functional groups, and tunable pore structures. [ 12,13 ] For example, SBA‐15 showed an outstanding adsorption effect on methylene blue, whose removal rate and adsorption capacity were 100% and 280 mg/g, respectively. [ 14 ] However, the incorporation of different organic and inorganic moieties into mesoporous silica is a popular approach for the enhancement of adsorption performance.…”

Section: Introductionmentioning

confidence: 99%

Effective and sequential removal of acid and basic dye wastewater with metallic hybrid mesoporous silica

Wen

Wei

et al. 2021

Applied Organom Chemis

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In this work, nickel‐modified mesoporous silica prepared via sol–gel method (Ni‐S) and co‐precipitation method (Ni‐C) as effective adsorbents were successfully employed for the removal of acid fuchsin (AF) and basic fuchsin (BF). The effect of the retained templates on the adsorption of AF in synthetic materials was investigated in detail. The results indicated that retained templates contributed to improve the adsorption of AF and the theoretical maximum adsorption capacity of Ni‐S reached 689.66 mg/g according to Langmuir model. The electrostatic attraction between the anions (‐SO3−) in the dye molecules and the cations (‐NH3+) in the template (HAD) helps to enhance the adsorption effect. The adsorption isotherm and kinetics data fitted perfectly to Langmuir isotherm model and followed the pseudo‐second‐order kinetics. The thermodynamic parameters calculated from temperature‐dependent isotherms suggested that AF adsorption on nickel‐modified hexagonal mesoporous silica (Ni‐HMS) was endothermic and spontaneous process. In addition, the above‐mentioned adsorbents depleted after adsorbing AF could be recovered by simple calcination to apply into the adsorption of BF and exhibited excellent removal performance for basic dyes.

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“…Due to all these adverse effects, such wastewater must be treated before discharge to the receiving environment and the pollutant concentrations must be reduced below the limit values specified in the regulations [11].Removal of color from wastewater is crucial for human health and sustainable water quality. In the literature, it was seen that many physical, chemical, biological and advanced treatment methods such as adsorption, biosorption, chemical oxidation, photolysis, chemical coagulation, flotation, ion exchange, electrodialysis, ozonation, membrane filtration were used in color removal from wastewater [12][13][14][15][16][17][18][19][20][21]. However, many of these methods require high investment and operating costs and also have various operational difficulties.…”

Section: Introcutionmentioning

confidence: 99%

“…Electrocoagulation experimental setup[37] 5 ml samples were taken at2,4,6, 8, 10, 12,14,16,18,20,25,30,35,45,60 minutes in all current densities (48.5 A/m 2 , 97.18 A/m 2 , 194.36 A/m 2 , 291.5 A/m 2 , 388.7 A/m 2 ). After the samples were centrifuged, the measurement of all samples, including calibration, was performed at UV-Vis recording spectrophotometer at intervals of 0.5 nm between 200-800 nm.…”

mentioning

confidence: 99%

Removal of Reactive Black 5 from Polluted Solutions by Electrocoagulation: Modelling Experimental Data Using Artificial Neural Networks

Oyar

Eren

Özdemir

2020

Sakarya University Journal of Science

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The wide range of today's industry increases the diversity of pollutants in the wastewater characteristics. In particular, the wastewater of the textile industry is highly colored. Different techniques are used for color removal of dyes from wastewater. In this work, the removal efficiency of the textile dye (Reactive Black 5) at different current densities (48.5 A/m 2 , 97.18 A/m 2 , 194.36 A/m 2 , 291.5 A/m 2 , 388.7 A/m 2) was investigated by electrocoagulation method. The dye concentration of wastewater prepared in the laboratory scale was adjusted to 100 mg/L. Two iron electrodes and 3 g NaCl were used in the electrocoagulation system. The samples which taken periodically were measured after the centrifugal processes with the UV spectrophotometer. The experimental results were also modelled with artificial neural networks (ANNs). As a result of the experiments, approximately 90-100% color removal efficiency was obtained. According to the modelling study, the ANNs can predict the color removal efficiency with coefficient of determination (R 2) between the experimental and predicted output variable reached up to 0.99.

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Mesoporous silica MCM-41, SBA-15 and derived bridged polysilsesquioxane SBA-PMDA for the selective removal of textile reactive dyes from wastewater

Cited by 33 publications

References 45 publications

Precise Controlled Target Molecule Release through Light-Triggered Charge Reversal Bridged Polysilsesquioxane Nanoparticles

Precise Controlled Target Molecule Release through Light-Triggered Charge Reversal Bridged Polysilsesquioxane Nanoparticles

Effective and sequential removal of acid and basic dye wastewater with metallic hybrid mesoporous silica

Removal of Reactive Black 5 from Polluted Solutions by Electrocoagulation: Modelling Experimental Data Using Artificial Neural Networks

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