Removal of Methylene Blue from aqueous solutions by adsorption on Kaolin: Kinetic and equilibrium studies

Zhao

J of Applied Polymer Sci

et al. 2019

Water contamination resulting from organic dyes has had severe detrimental effects on human health and environmental tolerance. To address this issue, a delicate strategy for taking host–guest function in porous organic polymers via a facile Friedel–Crafts reaction of triptycene and post‐modification was achieved. By means of this route, a sulfonic acid functionalized triptycene‐based porous organic polymer (TPOP–SO3H) with a hierarchical structure and a desirable Brunauer–Emmett–Teller value of 1002 m2/g was synthesized this study. The TPOP–SO3H material demonstrated a maximum adsorption capacity for methylene blue of 97.1 mg/g. Remarkably, an absorption efficiency of more than 90% of TPOP–SO3H was observed even after five cycles. Therefore, such a hierarchical porous organic polymer can be highly recommended as one type of promising material for the treatment of organic dye‐polluted wastewater. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47987.

Section: Resultssupporting

confidence: 83%

“…Similar kinetics were also observed in previous studies for the removal of MB from aqueous solution. 30,31 The q e s of TPOP-SO 3 H and other materials for MB are listed in Table III for comparison. Obviously, the q e s of TPOP-SO 3 H in this study were superior to those of some other developed adsorbents in terms of q e .…”

Section: Effect Of the Contact Timementioning

confidence: 99%

Facile synthesis of a triptycene‐based porous organic polymer with a high efficiency and recyclable adsorption for organic dyes

Zhao

J of Applied Polymer Sci

et al. 2019

“…As for the clay minerals, usually clay minerals are used as natural without any chemical modification [17]. Natural clays as adsorbents for the removal of dyes from wastewater are; montmorillonite, [5,18,19], bentonite [20], zeolites [6,[21][22][23][24], perlite [25], sepiolite [26] kaolinite [1,27,28], fibrous clay minerals [29] and Algerian diatomite [30].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of methylene blue onto natural Saudi Red Clay: isotherms, kinetics and thermodynamic studies

Khan

2020

Mater. Res. Express

The current work investigates the adsorption behavior of methylene blue (MB) from aqueous solution using natural Saudi Red Clay (SRC) adsorbent. The surface characteristics of the adsorbent were investigated using surface area measurements (S BET ), Scanning Electron Microscopy (SEM), X-ray florescence (XRF) and Fourier-Transform Infrared Spectroscopy (FTIR) and x-ray diffraction (XRD).Various process parameters such as pH, adsorbent dosage, initial dye concentration, contact time and temperature were investigated. MB removal efficiency was noticed to increase with increasing adsorbent dosage while the effect of pH was noticed to be insignificant for the pH range studied. Applying the Langmuir isotherm fitting to the experimental data, a maximum adsorption capacity was found to be 50.25 mg g −1 of clay at 298 K. Pseudo-first-order and pseudo-second-order models were applied to the experimental data to study the kinetics of the process. Pseudo-second-order model fitted well with the experimental as compared to the pseudo-first order model. The spontaneous and endothermic nature of the adsorption process was revealed by studying the thermodynamic parameters of the system. The positive ΔS°value indicates the affinity of MB molecules to the adsorbent surface. Re-usability/recycling study showed that this material can be successfully reused at least four times in this study without significant loss in the adsorption capabilities.

“…The textile industry is one of the highest polluters due to the number of organic dyes discharged into wastewater. Textile dyes are considered toxic and harmful for animals and plants, being poorly biodegradable and resistant to environmental conditions [27][28][29]. Several methods, including the photo-catalytic technique using metal nanoparticles, can remove or degrade organic dyes at room temperature [30].…”

Section: Introductionmentioning

confidence: 99%

A photocatalytic and electrochemical study of gold nanoparticles synthesized by a green approach

Herrero-Calvillo

Santoveña-Uribe

Esparza

et al. 2020

Mater. Res. Express

Quasi-spherical gold nanoparticles mixed with a controlled amount of gold nano triangles were obtained through a green chemical method using leaf extract of Loeselia mexicana. Moreover, the influence of the extract and HAuCl 4 solution concentration in the morphology of the nanoparticles was studied. The nanoparticle preparation was performed by varying the concentration of the extract and precursor salt. The catalytic activity of the as-prepared nanoparticles was studied by the reduction of methylene blue, rhodamine B, and gentian violet organic dyes. Also, cyclic voltammetry profiles were obtained in order to analyze the electrochemical response of the nanoparticles. The morphology and structural characterization were analyzed by UV-vis, SEM, TEM, FTIR, and XRD. The SEM analysis reveals gold nanoparticles with spherical and triangular morphologies. The UV-vis spectra revealed that the extract concentration influenced the morphology and amount of the obtained gold nanoparticles. The XRD and TEM analysis showed that gold nanoparticles presented a face-centered cubic lattice structure. The cyclic voltammetry analysis confirms a high-sensitivity electrochemical response and stability corresponding to the gold nano triangles. Finally, the presence of gold nano triangles shapes influenced the efficiency of the degradation of the dyes due to their high specific surface area.