scholarly journals Amidation modified waste polystyrene foam as an efficient recyclable adsorbent for organic dyes removal

2021 ◽  
Author(s):  
Yanghao Pu ◽  
Zhengfeng Xie ◽  
Hao Ye ◽  
Wei Shi
Keyword(s):  
Organic Dyes ◽  
Condensation Reaction ◽  
Polystyrene Foam ◽  
Efficient Removal ◽  
Langmuir Adsorption ◽  
Waste Polystyrene ◽  
Adsorption Capacities ◽  
Pseudo Second Order ◽  
Recyclable Adsorbent ◽  
Modified Polystyrene

Abstract Modifying environmentally harmful waste polystyrene foam as an efficient recyclable adsorbent for organic dyes is important. Amidation modified polystyrene (PS-SD) was prepared by the Friedel-Crafts reaction and N,N'-dicyclohexylcarbodiimide (DCC) dehydration condensation reaction of waste polystyrene foam. PS-SD had highly efficient removal performance for organic dyes in large volume water sample solutions, and equilibrium was achieved in 0.5 h. The maximum adsorption capacities for Methylene blue (MB) and Congo red (CR) were 881.62 and 1,880.91 mg/g, respectively, at room temperature according to the Langmuir adsorption isotherm (R2 > 0.99). The kinetic data of the two dyes followed pseudo-second-order kinetics. The removal percentage remained high (>85%) after eight filtration-regeneration cycles. Experimental results showed that PS-SD was an excellent adsorbent for water treatment with high recyclability and long life.

One-step synthesis of SnO2-reduced graphene oxide (SOG) composites for efficient removal of organic dyes from wastewater

RSC Advances ◽  
2016 ◽  
Vol 6 (102) ◽  
pp. 100636-100642 ◽  
Author(s):  
Wenzhu Yin ◽  
Huaqiang Cao
Keyword(s):  
Graphene Oxide ◽  
Organic Dyes ◽  
Functionalized Graphene ◽  
High Adsorption ◽  
Efficient Removal ◽  
Functionalized Graphene Oxide ◽  
Adsorption Capacities ◽  
Reduced Graphene ◽  
One Step ◽  
Adsorption Rates

In this work, SnO2 functionalized graphene oxide was shown to possess high adsorption capacities and fast adsorption rates for organic dyes over wide pH ranges. Additionally, the adsorbent could be easily regenerated by washing with ethanol.

scholarly journals Adsorption of Arsenic and Heavy Metals from Solutions by Unmodified Iron-Ore Sludge

2019 ◽  
Vol 9 (4) ◽  
pp. 619 ◽  
Author(s):  
Khai Nguyen ◽  
Bien Nguyen ◽  
Hai Nguyen ◽  
Ha Nguyen
Keyword(s):  
Heavy Metals ◽  
Iron Ore ◽  
Batch Studies ◽  
Mixed Metal ◽  
Langmuir Adsorption ◽  
First Order ◽  
Adsorption Capacities ◽  
Ore Processing ◽  
Pseudo Second Order ◽  
Negative Impacts

Arsenic and heavy-metal-contaminated environments are a major concern due to their negative impacts on exposed people and ecosystems. In this study, sludge from an iron-ore processing area was used as an adsorbent to remove As, Mn, Zn, Cd, and Pb from aqueous solutions. The adsorption capacity of target adsorbates was investigated in batch experiments of both single- and mixed-metal solutions. The batch studies show that the maximum Langmuir adsorption capacities of the heavy metals onto the adsorbent occurred in the order Pb > As > Cd > Zn > Mn, and ranged from 0.710 mg/g to 1.113 mg/g in the single-metal solutions and from 0.370 mg/g to 1.059 mg/g in the mixed-metal solutions. The results of the kinetic experiments are consistent with pseudo-first-order and pseudo-second-order models, with a slightly better fit to the latter. Adsorption performances indicate that iron-ore sludge can simultaneously adsorb multiple metal ions and is a promising adsorbent for the removal of toxic pollutants from water.

Cationic porous organic polymers as an excellent platform for highly efficient removal of pollutants from water

2018 ◽  
Vol 6 (42) ◽  
pp. 20653-20658 ◽  
Author(s):  
Xiaochen Shen ◽  
Si Ma ◽  
Hong Xia ◽  
Zhan Shi ◽  
Ying Mu ◽  
...  
Keyword(s):  
Organic Dyes ◽  
Organic Polymer ◽  
Efficient Removal ◽  
Porous Organic Polymers ◽  
Porous Organic Polymer ◽  
Highly Efficient ◽  
Adsorption Capacities ◽  
Adsorption Rates ◽  
Excellent Selectivity ◽  
Rapid Adsorption

A robust, cationic, porous organic polymer (C-NSANaph-HCP@Br), which exhibits excellent adsorption capacities for organic dyes and Cr2O72− in water with rapid adsorption rates, excellent selectivity and good recyclability, is reported.

Synthesis, Adsorption Behavior of a Maleamic Acid Cross-Linked β- Cyclodextrin Polymer for Removal of Basic Fuchsin in Aqueous Solution

2014 ◽  
Vol 937 ◽  
pp. 9-16
Author(s):  
Xiao Mei Zhang ◽  
Hong Zhan Li ◽  
Man Li Cao ◽  
Chao Yue Chen
Keyword(s):  
Aqueous Solution ◽  
Adsorption Behavior ◽  
Basic Fuchsin ◽  
Order Model ◽  
Kinetics Of Adsorption ◽  
Langmuir Adsorption ◽  
Adsorption Capacities ◽  
Pseudo Second Order ◽  
Maleamic Acid ◽  
Kinetics Of

A crosslinked β-cyclodextrin (β-CD) polymer (PCD) was synthesized by using maleamic acid as a crosslinked agent, and its adsorption behavior for basic fuchsin in aqueous solution was investigated. The adsorption isotherms could be well fitted by the Langmuir adsorption equation. On the basis of the Langmuir analysis, the maximum adsorption capacities were determined to be 33.56 mg·g-1 at 308K. The kinetics of adsorption followed the pseudo-second-order model.

scholarly journals Direct Synthesis of Sodalite from Indonesian Kaolin for Adsorption of Pb2+ Solution, Kinetics, and Isotherm Approach

2019 ◽  
Vol 14 (3) ◽  
pp. 502 ◽  
Author(s):  
Tri Wahyuni ◽  
Didik Prasetyoko ◽  
Suprapto Suprapto ◽  
Imroatul Qoniah ◽  
Hasliza Bahruji ◽  
...  
Keyword(s):  
Direct Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Langmuir Adsorption ◽  
Water Composition ◽  
Adsorption Capacities ◽  
Particle Size Analyzer ◽  
Aging Conditions ◽  
Pseudo Second Order ◽  
Solution Kinetics

Indonesian kaolin was used as precursor for synthesis of sodalite. Synthesis parameters were optimized by varying the Si/Al ratios, stirring and aging conditions, and water composition. X-ray diffraction (XRD), Fourier Transform Infra Red (FTIR), Scanning Electron Microscope-Energy Dispersive X-ray (SEM-EDX), and Particle Size Analyzer (PSA) were used to characterize sodalite. The potential of sodalite as adsorbent for heavy metal Pb2+ ions removal from waste water was investigated in this work. The uptake adsorption capacities of sodalite was 90-100 mg/g from synthesized sodalite crystallized for 24 and 48 hours, and commercial silica. The kinetic of Pb2+ adsorption was a pseudo second order reaction and the adsorption coefficients was followed Langmuir adsorption isotherm. Copyright © 2019 BCREC Group. All rights reserved

scholarly journals Study on the adsorption of Rhodamine B on MoS2/RGO composite

2020 ◽  
Vol 9 (4) ◽  
pp. 57-63
Author(s):  
Trang Phan Thi Thuy ◽  
Tam Truong Thanh ◽  
Vien Vo ◽  
Lien Nguyen Hong
Keyword(s):  
Room Temperature ◽  
Adsorption Process ◽  
Organic Dyes ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Langmuir Adsorption ◽  
Reduced Graphene ◽  
Effects Of Ph ◽  
Pseudo Second Order ◽  
Oxide Composite Material

In this study, MoS2/RGO (reduced graphene oxide) composite material was synthesized and tested for adsorption of RhB in water. The adsorption studies were carried out at room temperature and the effects of pH, amount of adsorbents, concentration of adsorbate and time of adsorption on the adsorption were measured. In addition, the dynamics of the adsorption process was also investigated. The results showed that the MoS2/RGO composite displayed toward RhB with maximum adsorption capacity reaching q = 57.79 mg/g at pH = 3.54 and the adsorption process follows the Langmuir adsorption isotherm with the pseudo-second-order model. Findings from this research indicated that the graphene based semiconductor MoS2/RGO composite could be considered a promising adsorbent for removal of organic dyes from waste waters.

Adsorption of Ni2+ and Cu2+ from Aqueous Solution by Polyethylenimine Impregnation of Metal–Organic Frameworks

NANO ◽  
2020 ◽  
Vol 15 (03) ◽  
pp. 2050029 ◽  
Author(s):  
Dan Wang ◽  
Xinfeng Xiao ◽  
Bo Han ◽  
Weiming Ni ◽  
Yu Gao ◽  
...  
Keyword(s):  
Order Kinetic ◽  
Adsorption Model ◽  
Elution Time ◽  
Langmuir Adsorption ◽  
Langmuir Adsorption Model ◽  
Adsorption Capacities ◽  
Order Kinetic Model ◽  
Metal Organic ◽  
Pseudo Second Order

A series of UiO-66-PEI materials were obtained by impregnating UiO-66 with different amounts of polyethylenimine (PEI) with UiO-66 as the basic skeleton material. The materials were used as adsorbents to remove Ni[Formula: see text] and Cu[Formula: see text] from water. The prepared UiO-66-PEI-30 had good adsorption capacity on Ni[Formula: see text] and Cu[Formula: see text] at 30% PEI. The adsorption of Ni[Formula: see text] and Cu[Formula: see text] with UiO-66-PEI-30 was further studied. The role of eluent types, elution time, concentration and volume on the effect of Cu[Formula: see text] elution was investigated. The adsorption of Ni[Formula: see text] and Cu[Formula: see text] by UiO-66-PEI-30 followed the pseudo-second-order kinetic model and Langmuir adsorption model. The maximum adsorption capacities obtained by Langmuir fitting for Ni[Formula: see text] and Cu[Formula: see text] were 11.54[Formula: see text]mg[Formula: see text]g[Formula: see text] and 24.87[Formula: see text]mg[Formula: see text]g[Formula: see text], respectively. After four desorption/adsorption experiments, UiO-66-PEI-30 still showed good adsorption performance. UiO-66 impregnated with PEI was an adsorbent with adsorption potential.

scholarly journals A Sustainable Natural Clam Shell Derived Photocatalyst for the Effective Adsorption and Photodegradation of Organic Dyes

2021 ◽  
Author(s):  
Hailong Zhang ◽  
Xinxin Yao ◽  
Ting Qu ◽  
Gary Owens ◽  
Liangjun Gao
Keyword(s):  
Organic Dyes ◽  
Low Cost ◽  
Waste Product ◽  
Research Focus ◽  
Clam Shell ◽  
Industry Waste ◽  
Adsorption Capacities ◽  
Pseudo Second Order ◽  
Practical Field ◽  
Dye Solutions

Abstract In response to the increasing desire for modern industries to be both green and sustainable, there has been increasing research focus on the reutilization of natural waste materials to effectively remove and degrade toxic wastewater effluents. One interesting food industry waste product is clam shells. Here a new photocatalytic nanomaterial derived from marine clam shells was successfully prepared and characterized. Thereafter the material was applied for the removal of two target dyes from aqueous solution, where the effect of both catalyst dose and initial dye concentration on adsorption and photocatalysis properties was investigated. The maximum adsorption capacities of methylene blue (100 mg/L) and Congo red (500 mg/L) were 123.45 mg/g and 679.91 mg/g, respectively, where adsorption followed pseudo second order kinetics predominantly via a chemical adsorption process. The photodegradation removal efficiencies of the two dye solutions under visible light irradiation were 99.6% and 83.3% for MB and CR respectively. These results demonstrated that a clam shell catalyst also exhibited excellent degradation performance in a mixed dye solution with strong degradation capability and low cost, making the material a good candidate for practical field remediation of dye contaminated wastewater.

scholarly journals Adsorptive Removal of Cd, Cu, Ni and Mn from Environmental Samples Using Fe3O4-Zro2@APS Nanocomposite: Kinetic and Equilibrium Isotherm Studies

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3209
Author(s):  
Aphiwe Siyasanga Gugushe ◽  
Anele Mpupa ◽  
Tshimangadzo Saddam Munonde ◽  
Luthando Nyaba ◽  
Philiswa Nosizo Nomngongo
Keyword(s):  
Electron Microscopy ◽  
Magnetic Nanomaterials ◽  
Batch Mode ◽  
X Ray ◽  
Freundlich Isotherms ◽  
Adsorption Capacities ◽  
Transmission Electron ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
Wastewater Samples

In this study, Fe3O4-ZrO2 functionalized with 3-aminopropyltriethoxysilane (Fe3O4-ZrO2@APS) nanocomposite was investigated as a nanoadsorbent for the removal of Cd(II), Cu(II), Mn (II) and Ni(II) ions from aqueous solution and real samples in batch mode systems. The prepared magnetic nanomaterials were characterized using X-ray powder diffraction (XRD), scanning electron microscopy/energy dispersion x-ray (SEM/EDX) Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). Factors (such as adsorbent dose and sample pH) affecting the adsorption behavior of the removal process were studied using the response surface methodology. Under optimized condition, equilibrium data obtained were fitted into the Langmuir and Freundlich isotherms and the data fitted well with Langmuir isotherms. Langmuir adsorption capacities (mg/g) were found to be 113, 111, 128, and 123 mg/g for Cd, Cu, Ni and Mn, respectively. In addition, the adsorption kinetics was analyzed using five kinetic models, pseudo-first order, pseudo-second order, intraparticle diffusion and Boyd models. The adsorbent was successfully applied for removal of Cd(II), Cu(II), Mn (II) and Ni(II) ions in wastewater samples.

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