Adsorption of Methylene Blue on Starch Microsphere from Aqueous Solutions

In order to resolve the pollution of coloured wastewater, starch microsphere was used to absorb methylene blue from aqueous solutions in this paper. Starch microsphere is artificial starch derivative, can be synthesized by cross-linking reaction from crude starch and modified starch. The cross-linked starch microsphere was prepared from soluble starch and N, N'-methylenebisacrylamide, and starch microsphere has characteres of irregular appearance, uniform size, suitable swelling, three-dimensional network structure, suitable shell pore diameter and specific surface area, good mechanical intensity. The microporous structure of starch microsphere was determined using Scanning Electronic Microscopy (SEM). The adsorption capacity of starch microsphere to methylene blue was studied. It could be shown that the adsorption capacity increases with the increase of concentration of methylene blue. Also, the lower the temperature was, the bigger the adsorption capacity of SM was in the same concentration. So, starch microsphere could effectively absorb methylene blue from aqueous solutions and thus the influencing factors of the adsorption were discussed in detail.

Download Full-text

Ouricuri (Syagrus coronata) fiber: a novel biosorbent to remove methylene blue from aqueous solutions

Water Science & Technology ◽

10.2166/wst.2016.495 ◽

2016 ◽

Vol 75 (1) ◽

pp. 106-114 ◽

Cited By ~ 19

Author(s):

Lucas Meili ◽

Társila Santos da Silva ◽

Daniely Carlos Henrique ◽

João Inácio Soletti ◽

Sandra Helena Vieira de Carvalho ◽

...

Keyword(s):

Methylene Blue ◽

Experimental Design ◽

Aqueous Solutions ◽

Adsorption Capacity ◽

Adsorption Process ◽

Fiber Diameter ◽

Aqueous Media ◽

Process Efficiency ◽

Maximum Adsorption Capacity ◽

Equilibrium Studies

In this work, the potential of ouricuri (Syagrus coronata) fiber as a novel biosorbent to remove methylene blue (MB) from aqueous solutions was investigated. The fiber was prepared and characterized according to the fundamental features for adsorption. A 23 experimental design was used to evaluate the effects of adsorbent dosage (M), fiber diameter (D) and agitation (A) on the adsorption capacity. In the more adequate conditions, kinetic and equilibrium studies were performed. The experimental design results showed that M = 10 g L−1), D = 0.595 mm and A = 200 rpm were the more adequate conditions for MB adsorption. Based on the kinetic study, it was found that the adsorption process was fast, being the equilibrium was attained at about 5 min, with 90% of color removal. The isotherm was properly represented by the Sips model, and the maximum adsorption capacity was 31.7 mg g−1. In brief, it was demonstrated that ouricuri fiber is an alternative biosorbent to remove MB from aqueous media, taking into account the process efficiency and economic viewpoint.

Download Full-text

Core-Shell Structured Magnetic Carboxymethyl Cellulose-Based Hydrogel Nanosorbents for Effective Adsorption of Methylene Blue from Aqueous Solution

Polymers ◽

10.3390/polym13183054 ◽

2021 ◽

Vol 13 (18) ◽

pp. 3054

Author(s):

Yiming Zhou ◽

Te Li ◽

Juanli Shen ◽

Yu Meng ◽

Shuhua Tong ◽

...

Keyword(s):

Methylene Blue ◽

Aqueous Solutions ◽

Adsorption Capacity ◽

Carboxymethyl Cellulose ◽

Chemical Properties ◽

Polymer Nanocomposite ◽

Core Shell ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Solution Ph

This article reports effective removal of methylene blue (MB) dyes from aqueous solutions using a novel magnetic polymer nanocomposite. The core-shell structured nanosorbents was fabricated via coating Fe3O4 nanoparticles with a layer of hydrogel material, that synthesized by carboxymethyl cellulose cross-linked with poly(acrylic acid-co-acrylamide). Some physico-chemical properties of the nanosorbents were characterized by various testing methods. The nanosorbent could be easily separated from aqueous solutions by an external magnetic field and the mass fraction of outer hydrogel shell was 20.3 wt%. The adsorption performance was investigated as the effects of solution pH, adsorbent content, initial dye concentration, and contact time. The maximum adsorption capacity was obtained at neutral pH of 7 with a sorbent dose of 1.5 g L−1. The experimental data of MB adsorption were fit to Langmuir isotherm model and Pseudo-second-order kinetic model with maximum adsorption of 34.3 mg g−1. XPS technique was applied to study the mechanism of adsorption, electrostatic attraction and physically adsorption may control the adsorption behavior of the composite nanosorbents. In addition, a good reusability of 83.5% MB recovering with adsorption capacity decreasing by 16.5% over five cycles of sorption/desorption was observed.

Download Full-text

Formation of lithium, sodium and potassium complexes with 1,3,5-triamino-1,3,5-trideoxy-cis-inositol (taci)

Acta Crystallographica Section C Structural Chemistry ◽

10.1107/s2053229614011036 ◽

2014 ◽

Vol 70 (6) ◽

pp. 632-637 ◽

Cited By ~ 1

Author(s):

Christian Neis ◽

Thomas Kradolfer ◽

Kaspar Hegetschweiler

Keyword(s):

Hydrogen Bonds ◽

Aqueous Solutions ◽

Single Crystals ◽

Three Dimensional ◽

Metal Cations ◽

Chair Conformation ◽

Dimensional Network ◽

Hydroxy Groups ◽

Sodium And Potassium

Single crystals of (1,3-diamino-5-azaniumyl-1,3,5-trideoxy-cis-inositol-κ3O2,O4,O6)(1,3,5-triamino-1,3,5-trideoxy-cis-inositol-κ3O2,O4,O6)lithium(I) diiodide dihydrate, [Li(C6H16N3O3)(C6H15N3O3)]I2·2H2O or [Li(Htaci)(taci)]I2·2H2O (taci is 1,3,5-triamino-1,3,5-trideoxy-cis-inositol), (I), bis(1,3,5-triamino-1,3,5-trideoxy-cis-inositol-κ3O2,O4,O6)sodium(I) iodide, [Na(C6H15N3O3)2]I or [Na(taci)2]I, (II), and bis(1,3,5-triamino-1,3,5-trideoxy-cis-inositol-κ3O2,O4,O6)potassium(I) iodide, [K(C6H15N3O3)2]I or [K(taci)2]I, (III), were grown by diffusion of MeOH into aqueous solutions of the complexes. The structures of the Na and K complexes are isotypic. In all three complexes, the taci ligands adopt a chair conformation with axial hydroxy groups, and the metal cations exhibit exclusive O-atom coordination. The six O atoms of the resultingMO6unit define a centrosymmetric trigonal antiprism with approximateD3dsymmetry. The interligand O...O distances increase significantly in the order Li < Na < K. The structure of (I) exhibits a complex three-dimensional network ofR—NH2—H...NH2—R,R—O—H...NH2—RandR—O—H...O(H)—H...NH2—Rhydrogen bonds. The structures of the Na and K complexes consist of a stack of layers, in which each taci ligand is bonded to three neighboursviapairwise O—H...NH2interactions between vicinal HO—CH—CH—NH2groups.

Download Full-text

Removal of a basic dye from aqueous solution by adsorption using rice hulls

Global NEST Journal ◽

10.30955/gnj.000560 ◽

2013 ◽

Vol 13 (1) ◽

pp. 90-98 ◽

Cited By ~ 3

Keyword(s):

Methylene Blue ◽

Aqueous Solutions ◽

Adsorption Capacity ◽

Dye Removal ◽

Rice Hull ◽

Environmental Concerns ◽

Rice Hulls ◽

Wide Range ◽

Initial Ph ◽

Dilute Aqueous Solutions

The removal of dyes from colored effluents, particularly from textile industries, is one of the major environmental concerns these days. Current methods for removing dyes from wastewaters are costly and cannot effectively be used to treat wide range of such wastewaters. This work describes the use of grounded rice hull as adsorbent material. Aqueous solutions of various methylene blue dye concentrations (5-25 mg l-1) were shaken with certain amount of adsorbents to determine the adsorption capacity. Both treated and untreated rice hulls were used for methylene blue adsorption. The effects of adsorbents dose, initial pH, initial dye concentration and contact time on dye removal have been studied. Maximum dye was sequestered from the solution within 60-90 min after the beginning of every experiment. The adsorption capacity increased from 72 to 94 % with increasing the pH from 3 to 10. Pretreatment of rice hulls with citric acid did not reveal any beneficial effect. Rice hulls were more effective compared to commercial used adsorbents used. The results showed that ground rice hulls can be considered as potential adsorbents for methylene blue removal from dilute aqueous solutions.

Download Full-text

Effective removal of Pb2+ from oral medical wastewater via an activated three-dimensional framework carbon (3D AFC)

Applied Water Science ◽

10.1007/s13201-021-01486-2 ◽

2021 ◽

Vol 11 (9) ◽

Author(s):

Fuxiang Song ◽

Na Wang ◽

Zezhou Hu ◽

Zhen Zhang ◽

Xiaoxue Mai ◽

...

Keyword(s):

Adsorption Capacity ◽

Three Dimensional ◽

High Specific Surface Area ◽

Maximum Adsorption Capacity ◽

Freundlich Model ◽

Dimensional Network ◽

Effective Removal ◽

Strong Adsorption ◽

Pseudo Second Order ◽

Main Material

AbstractOral medical wastewater with heavy metal ions (such as plumbum, Pb2+) is regarded as the main pollutant produced in the oral cavity diagnosis, and the treatment process can pose a serious threat to human health. The removal of Pb2+ from oral medical wastewater facing major difficulties and challenges. Therefore, it is of great significance to take effective measures to remove Pb2+ by using effective methods. A new activated three-dimensional framework carbon (3D AFC), regarded as the main material to remove Pb2+ in the oral medical wastewater, has been fabricated successfully. In this experiment, the effects of 3D AFC absorbing Pb2+ under different conditions (including solid-to-liquid ratio, pH, ionic strength, contact time, and initial concentration, etc.) were discussed. And the result revealed that the adsorption kinetics process of Pb2+ on 3D AFC conformed to the pseudo-second-order model and the adsorption isotherm conformed to the Freundlich model. Under the condition that pH = 5.5 and T = 298 k, the calculated maximum adsorption capacity of 3D AFC for Pb2+ was 270.88 mg/g. In practical application, it has strong adsorption ability for Pb2+ in oral medical wastewater. Thus, 3D AFC shows promise for Pb2+ remove and recovery applications because of high adsorption capacity for Pb2+ in oral medical wastewater due to its high specific surface area, outstanding three-dimensional network structure.

Download Full-text

A three-dimensional nano-network WO3/F-TiO2-{001} heterojunction constructed with OH-TiOF2 as the precursor and its efficient degradation of methylene blue

RSC Advances ◽

10.1039/d1ra04809k ◽

2021 ◽

Vol 11 (42) ◽

pp. 26063-26072

Author(s):

Chentao Hou ◽

Jing Hao

Keyword(s):

Methylene Blue ◽

Hydrothermal Method ◽

Network Structure ◽

Three Dimensional ◽

Semiconductor Material ◽

Dimensional Network ◽

New Type

A new type of WO3/F-TiO2-{001} heterostructure semiconductor material with a three-dimensional network structure was successfully prepared by the hydrothermal method.

Download Full-text

Metall(II)-Diazin Komplexe: Kristallstrukturen von Cd(pyrazin)Br2, Cd(pyrazin)I2, Cu(pyrazin)Cl2 und Cd(pyrimidin)(NO3)2·2H2O/ Metal(II) Diazine Complexes: Crystal Structures of Cd(pyrazine)Br2, Cd(pyrazine)I2, Cu(pyrazine)Cl2, and Cd(pyrimidine)(NO3)2·2H2O.

Zeitschrift für Naturforschung B ◽

10.1515/znb-1997-1203 ◽

1997 ◽

Vol 52 (12) ◽

pp. 1456-1460 ◽

Cited By ~ 26

Author(s):

Joachim Pickardt ◽

Benedikt Staub

Keyword(s):

Hydrogen Bonds ◽

Organic Solvent ◽

Aqueous Solutions ◽

Single Crystals ◽

Crystal Structures ◽

Three Dimensional ◽

Metal Salts ◽

Dimensional Network ◽

Supramolecular Networks

Abstract Single crystals of the compounds Cd(pyrazine)Br2, Cd(pyrazine)I2, Cu(pyrazine)Cl2 and Cd(pyrimidine)(NO3)2·2H2O were obtained by crystallisation from aqueous solutions of the metal salts and solutions of the respective diazine in an organic solvent.The structures of the pyrazine complexes consist of “supramolecular” networks of -M-pyrazine-M-and -M -(μ2-Hal)2-M-chains. The pyrimidine complex shows a three dimensional network due to -M-pyrimidine-M-chains connected via hydrogen bonds between H(H2O) and O(ONO2).

Download Full-text

Adsorption of methylene blue and methyl red dyes from aqueous solutions onto modified zeolites

Water Science & Technology ◽

10.2166/wst.2013.672 ◽

2013 ◽

Vol 67 (5) ◽

pp. 1129-1136 ◽

Cited By ~ 33

Author(s):

Z. Ioannou ◽

Ch. Karasavvidis ◽

A. Dimirkou ◽

V. Antoniadis

Keyword(s):

Methylene Blue ◽

Aqueous Solutions ◽

Adsorption Capacity ◽

Activated Charcoal ◽

Dye Adsorption ◽

Methyl Red ◽

Equilibrium Isotherms ◽

Modified Zeolite ◽

Pseudo Second Order ◽

Mb Adsorption

Zeolite, hematite, modified zeolite and commercial activated charcoal were examined for their ability to remove methylene blue (MB) and methyl red (MR) from their aqueous solutions. Modified zeolite and hematite were produced according to the Schwertmann and Cornell method while zeolite and commercial activated charcoal were obtained from S&B and Fluka AG companies, respectively. Adsorption experiments were conducted at three different adsorbent-to-solution ratios, namely 8, 16 and 24 g/L under environmental conditions and continuous stirring. Equilibrium isotherms of MB and MR were studied at different initial concentrations (from 5 × 10−4 to 5 × 10−3 g/L). MB adsorption kinetics were also studied. The maximum adsorption of MB and MR from their aqueous solutions was achieved at 24 g/L (adsorbent-to-dye solution ratio) after 1 h and was equal to 100% (MB) on modified zeolite and 99% (MR) on commercial activated charcoal, respectively. All the other materials achieved intermediate values of dye adsorption. From the applied kinetic models, the pseudo-second-order equation best described the adsorption of MB and MR. Consequently, modified zeolite showed the highest adsorption capacity for MB, while commercial activated charcoal showed the highest adsorption capacity of MR. The studied adsorbents can be used as filters to remove dyes from wastewaters.

Download Full-text

Fabrication of sponge biomass adsorbent through UV-induced surface-initiated polymerization for the adsorption of Ce(III) from wastewater

Water Science & Technology ◽

10.2166/wst.2017.144 ◽

2017 ◽

Vol 75 (12) ◽

pp. 2755-2764 ◽

Cited By ~ 6

Author(s):

Chen Liu ◽

Chunjie Yan ◽

Sen Zhou ◽

Wen Ge

Keyword(s):

Rare Earth ◽

Aqueous Solutions ◽

Adsorption Capacity ◽

Adsorption Property ◽

Three Dimensional ◽

Soxhlet Extraction ◽

Rare Earth Ions ◽

Rare Earth Ion ◽

Surface Initiated Polymerization ◽

Insight Into

The recovery of rare earth ions from industrial wastewater has aroused wide concern in recent years. In present work, we synthesized a novel three-dimensional adsorbent (denoted as LF-AA) by grafting loofah fiber with acrylic acid via ultraviolet radiation. The LF-AA was washed by boiling water and subjected to soxhlet extraction with acetone and then fully characterized by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and scanning electron microscopy (SEM). Rare earth ion (Ce(III)) was selected as a model to validate its adsorption property. The saturation adsorption capacity for Ce(III) reaches 527.5 mg/g. Not only was this material highly efficient at adsorbing Ce(III) from aqueous solutions, it also proved to have ideal performance in regeneration; the total adsorption capacity of LF-AA for Ce(III) after six successive cycles decreased only 6.40% compared with the initial capacity of LF-AA. More importantly, the LF-AA can be easily separated from aqueous solutions because of its three-dimensional sponge natural structure. This study provides a new insight into the fabrication of biomass adsorbent and demonstrated that the LF-AA can be used as excellent adsorbent for the recovery of rare earth ions from wastewater.

Download Full-text