Polyethyleneimine-impregnated alkali treated waste bamboo powder for effective dye removal

Abstract In this study, the polyethyleneimine (PEI) modified waste bamboo powder (WBP-Na-PEI) was successfully prepared and applied to adsorbing Congo red (CR) dye from aqueous solution. The obtained materials were characterized by field emission scanning electron microscope, X-ray diffraction, Fourier transform-infrared, and thermogravimetric analysis. The results showed that WBP-Na-PEI(1.8 K-5) was synthesized successfully and PEI uniformly covered the WBP-Na-PEI(1.8 K-5) surface. In the process of adsorption, four kinds of influencing factors were discussed, and the adsorption mechanisms such as kinetics, isotherm, thermodynamics were explored. The maximum adsorption capacity of WBP-Na-PEI(1.8 K-5) was 992.94 mg·g−1 at 298 ± 1 K, and the removal efficiency was over 98%. Pseudo-first-order, pseudo-second-order and intra-particle diffusion models were studied, the results showed that the adsorption process conformed to the pseudo-second-order model, and the rate of this process was controlled by many steps. Furthermore, the removal efficiency of the adsorption kinetics reached 85% within 10 minutes. The results of the isotherm model and thermodynamics showed that the adsorption process was consistent with the Langmuir model and was mainly a spontaneous chemical endothermic process of monolayer. And the removal efficiency of the adsorbent reached 93% at the concentration of 400 mg/L, which can be expected to have a broad prospect in the treatment of CR industrial wastewater.

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Application of Scallop shell-Fe3O4 nanoparticles for the removal of Cr(VI) from aqueous solutions

Water Science & Technology ◽

10.2166/wst.2017.120 ◽

2017 ◽

Vol 75 (10) ◽

pp. 2369-2380 ◽

Cited By ~ 5

Author(s):

Azita Mohagheghian ◽

Robabeh Vahidi-Kolur ◽

Melina Pourmohseni ◽

Jae-Kyu Yang ◽

Mehdi Shirzad-Siboni

Keyword(s):

Removal Efficiency ◽

Fe3o4 Nanoparticles ◽

Maximum Adsorption Capacity ◽

X Ray Diffraction ◽

Scallop Shell ◽

Order Model ◽

Adsorbent Dosage ◽

X Ray ◽

Intra Particle Diffusion ◽

Pseudo Second Order

In this study, removal of Cr(VI) by Scallop shell-Fe3O4 nanoparticles was investigated with variation of pH, adsorbent dosage, initial Cr(VI) concentration, ionic strength and temperature. Coating of Fe3O4 nanoparticles onto Scallop shell was identified by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. The maximum adsorption was observed at pH 3. Removal efficiency of Cr(VI) was increased with increasing adsorbent dosage, but was decreased with increasing initial Cr(VI) concentration and temperature. Removal efficiency of Cr(VI) was decreased in the presence of sulfate and carbonate ions. Adsorption kinetic study revealed that a pseudo-second order model better described the removal data than a pseudo-first order model and an intra-particle diffusion model. Maximum adsorption capacity was estimated to be 34.48 mg/g. Thermodynamic studies indicated that adsorption of Cr(VI) onto Scallop shell-Fe3O4 nanoparticles occurred via an exothermic (ΔH = −320.88 KJ mol−1) process. Adsorption efficiency of Cr(VI) by Scallop shell-Fe3O4 nanoparticles was maintained even after eight successive cycles.

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Application of activated bentonite for the removal of direct and reactive dye from aqueous solutions

Chemical Industry and Chemical Engineering Quarterly ◽

10.2298/ciceq171025012z ◽

2019 ◽

Vol 25 (4) ◽

pp. 341-351

Author(s):

Aleksandar Zdravkovic ◽

Novica Stankovic ◽

Nebojsa Ristic ◽

Goran Petkovic

Keyword(s):

Aqueous Solutions ◽

Dye Adsorption ◽

Bentonite Clay ◽

Reactive Dye ◽

Second Order ◽

Intra Particle Diffusion ◽

Naoh Solution ◽

Activated Bentonite ◽

Endothermic Process ◽

Pseudo Second Order

The aim of this study was to determine adsorptive properties of acid activated bentonite clay for the removal of Direct Red 173 (DR 173) and Reactive Red 22 (RR 22) dyes from aqueous solutions. Raw and modified clay were characterized by the following methods: Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRPD), and scanning electron microscopy (SEM). The efficiency of activated clay adsorption was investigated depending on process parameters: the adsorbent dose, pH, temperature, initial dye concentration, and contact time. Experimental data were analyzed by Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm as well as kinetic models of pseudo-first order, pseudo-second order and intra-particle diffusion. The process of dye adsorption was best described by Langmuir, Temkin, and Dubinin-Radushkevich isotherm (R2 > 0.97). Pseudo-second order model (R2 > 0.99) had the highest correlation with the obtained kinetic results. The positive value of ?H? indicated that adsorption of dyes by activated bentonite clay is endothermic process. The activated bentonite exhibited good regenerative ability in the 0.1 M NaOH solution. Maximum adsorption capacities of acid activated bentonite clay at 25?C for DR 173 and RR 22 dyes were 356.65 and 109.58 ?mol g-1, respectively.

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Removal of acetaminophen (ACT) from aqueous solution by using nanosilica adsorbent: experimental study, kinetic and isotherm modeling

Pigment & Resin Technology ◽

10.1108/prt-06-2019-0057 ◽

2020 ◽

Vol 49 (1) ◽

pp. 55-62

Author(s):

Akbar Eslami ◽

Zahra Goodarzvand Chegini ◽

Maryam Khashij ◽

Mohammad Mehralian ◽

Marjan Hashemi

Keyword(s):

Removal Rate ◽

Synthesis Method ◽

Freundlich Isotherm ◽

Second Order ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

X Ray Diffraction ◽

Content Type ◽

Bet Analysis ◽

Pseudo Second Order

Purpose A nanosilica adsorbent was prepared and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and BET. Design/methodology/approach The optimum conditions for the highest adsorption performance were determined by kinetic modeling. The adsorbent was used for the adsorption of acetaminophen (ACT), and the parameters affecting the adsorption were discussed like pH, initial concentration, contact time and adsorbent dosage. The adsorbent have been characterized by SEM, XRD and BET analysis. The kinetic models including pseudo-first-order and pseudo-second-order with Langmuir and Freundlich isotherm models were applied to investigate the kinetic and isotherms parameters. Findings The adsorption of ACT increased to around 95% with the increase of nanosilica concentration to 30 g/L. Moreover, the adsorption process of ACT follows the pseudo-second-order kinetics and the Langmuir isotherm with the maximum adsorption capacity of 609 mg/g. Practical implications This study provided a simple and effective way to prepare of nanoadsorbents. This way was conductive to protect environmental and subsequent application for removal of emerging pollutants from aqueous solutions. Originality/value The novelty of the study is synthesizing the morphological and structural properties of nanosilica-based adsorbent (specific surface area, pore volume and size, shape and capability) and improving its removal rate through optimizing the synthesis method; and studying the capability of synthesis of nanosilica-based adsorbent for removal of ACT as a main emerging pharmaceutical water contaminant.

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A Facilely Synthesized Tourmaline-Biochar Composite For Enhanced Removal of Cr (VI) From Aqueous Solution

10.21203/rs.3.rs-728034/v1 ◽

2021 ◽

Author(s):

Qi Lu ◽

Siyi Huang ◽

Xiaorui Ma

Keyword(s):

Aqueous Solution ◽

Pyrolysis Temperature ◽

Adsorption Property ◽

Energy Dispersive Spectrometer ◽

Maximum Adsorption Capacity ◽

X Ray Diffraction ◽

Adsorption Mechanisms ◽

Monolayer Adsorption ◽

Initial Ph ◽

Pseudo Second Order

Abstract A tourmaline-biochar composite (TMBC) was facilely synthesized to effectively remove Cr (Ⅵ) from aqueous solution. The effects of different ratio (TM: BC) and pyrolysis temperature on TMBC adsorption performance were compared for optimal condition of TMBC preparation. The TMBC samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) and scanning electron microscope-energy dispersive spectrometer (SEM-EDS). The kinetics and thermodynamics were analyzed to investigate the sorption mechanism for removal of Cr (VI). The results showed that the proper pyrolysis temperature was 650℃, and the ratio of TM and BC was 1:3. SEM results showed that there are many pores in the biochar structure, which is helpful for tourmaline dispersion. The adsorption kinetics was fitted well by the pseudo-second-order model, indicating the sorption is related to chemical absorption. Freundlich adsorption isotherms suggested monolayer adsorption between Cr (Ⅵ) and TMBC, and the maximum adsorption capacity of TMBC for Cr (Ⅵ) was 53.10 mg/g at initial pH 4.0, which is more than twice higher than pristine TM (17.85 mg/g). Such adsorption mechanisms included water automatically polarized, ion exchange and electrode adsorption, among which the automatic polarization of water caused by tourmaline was the unique adsorption property of TMBC. So TMBC composite can be used as an economic adsorbent in the remediation of heavy metal pollution in water.

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Fabrication of magnetic lignin-based adsorbent for removal of methyl orange dye from aqueous solution

BioResources ◽

10.15376/biores.16.3.5436-5449 ◽

2021 ◽

Vol 16 (3) ◽

pp. 5436-5449

Author(s):

Chao Cao ◽

Lupeng Shao ◽

Lucian A. Lucia ◽

Yu Liu

Keyword(s):

Aqueous Solution ◽

Methyl Orange ◽

Influence Factors ◽

Maximum Adsorption Capacity ◽

X Ray Diffraction ◽

Adsorption Mechanisms ◽

Equilibrium Data ◽

Pseudo Second Order ◽

Methyl Orange Dye ◽

Adsorption Desorption

Magnetic lignin-based adsorbent (MLA) was successfully fabricated to remove methyl orange dye from aqueous solution. The synthesized MLA was characterized by means of Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), N2 adsorption-desorption, scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). In the process of adsorption, influence factors and recycling performance were considered, and the adsorption mechanisms such as isotherm and kinetics were investigated. The result showed that the equilibrium data was consisted with the Langmuir model with a maximum adsorption capacity of 85.0 mg/g. The adsorption kinetics followed a pseudo-second-order model. Based the adsorption performance, MLA showed good recyclability. Therefore, these results demonstrate that MLA could offer a great potential as an efficient and reusable adsorbent in the wastewater treatments.

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Removal of Cesium and Strontium From Radioactive Wastewater by Prussian Blue Nanorods

10.21203/rs.3.rs-1200891/v1 ◽

2022 ◽

Author(s):

Chuqing Yao ◽

Yaodong Dai ◽

Shuquan Chang ◽

Haiqian Zhang

Keyword(s):

Prussian Blue ◽

Photoelectron Spectroscopy ◽

Adsorption Process ◽

Maximum Adsorption Capacity ◽

X Ray Diffraction ◽

X Ray ◽

Radioactive Wastewater ◽

Pseudo Second Order ◽

Co Precipitation ◽

Solvothermal Methods

Abstract In this work, novel Prussian blue tetragonal nanorods were prepared by template-free solvothermal methods for removal of radionuclide Cs and Sr. It was worth that Prussian blue nanorods exhibited the better adsorption performance than co-precipitation PB or Prussian blue analogue composites. Thermodynamic analysis implied that adsorption process was spontaneous and endothermic which was described well with Langmuir isotherm and pseudo-second-order equation, the maximum adsorption capacity of PB nanorod was estimated to be 194.26 mg g-1 and 256.62 mg g-1 for Cs+ and Sr2+. The adsorption mechanism of Cs+ and Sr2+ was studied by X-ray photoelectron spectroscopy, X-ray diffraction and 57Fe Mössbaure spectroscopy, the results revealed that Cs+ entered in PB crystal to generate a new phase, the most of Sr2+ was trapped in internal crystal and the other exchanged Fe2+. Furthermore, the effect of co-existing ions and pH for PB adsorption process were also investigated. The results suggest that PB nanorods were outstanding candidate for removal of Cs+ and Sr2+ from radioactive wastewater.

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Treatment of effluent from fertilizer industry by adsorption on willow sawdust-removal of Ni(II) and Cd(II) from the effluent

Ion Exchange Letters ◽

10.35933/iel.2021.13.001 ◽

2021 ◽

pp. 1-12

Author(s):

Raafia Najam ◽

Syed Muzaffar Ali Andrabi

Keyword(s):

Aqueous Solution ◽

Adsorption Process ◽

Low Cost ◽

Second Order ◽

Maximum Adsorption Capacity ◽

Solution Ph ◽

The World ◽

Pseudo Second Order ◽

Almost All ◽

Willow Tree

Sawdust of willow has been investigated as an adsorbent for the removal of Ni(II), and Cd(II) ions from aqueous solution. Since willow tree is widely grown in almost all parts of Kashmir, it can be a common most easily available, sustainable, low cost adsorbent for the treatment of wastewaters in this part of the world where growing industrialization is affecting water quality like elsewhere in the world. Therefore, it is worthwhile to investigate the potential of sawdust of willow tree as an adsorbent for the removal of Ni(II) and Cd(II) ions from aqueous solution as a first step. Batch experiments were conducted to study the effect of some parameters such as contact time, initial concentration of metal ions, solution pH and temperature. Langmuir and Freundlich models were employed for the mechanistic analysis of experimental data obtained. Results reveal that in our system adsorption follows the Langmuir isotherm. The maximum adsorption capacity of Ni(II) and Cd(II) were found to be 7.98 and 7.11 mg/g respectively at optimum conditions. The pseudo-ﬁrst-order and pseudo-second-order models were employed for kinetic analysis of adsorption process. The adsorption process follows pseudo-second-order kinetics. The efficacy of the adsorbent in the treatment of effluent from fertilizer factory has been investigated and the results have been found encouraging.

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Removal of Cadmium (II) from Aqueous Medium Using Vigna radiata Leave Biomass: Equilibrium Isotherms, Kinetics and Thermodynamics

Zeitschrift für Physikalische Chemie ◽

10.1515/zpch-2018-1223 ◽

2019 ◽

Vol 233 (5) ◽

pp. 669-690

Author(s):

Khalida Naseem ◽

Zahoor H. Farooqi ◽

Robina Begum ◽

Muhammad Zia Ur Rehman ◽

Aiman Shahbaz ◽

...

Keyword(s):

Aqueous Medium ◽

Vigna Radiata ◽

Adsorption Process ◽

Second Order ◽

Polluted Water ◽

Maximum Adsorption Capacity ◽

Physical Interaction ◽

Biosorption Process ◽

Langmuir Isotherm Model ◽

Pseudo Second Order

Abstract In the present study, a novel biosorbent Vigna radiata leaves biomass (L. biomass) was utilized for cadmium (II) extraction from aqueous medium. Cadmium (II) free and cadmium (II) loaded L. biomass was analyzed by Fourier transform infrared (FTIR) spectroscopy. Adsorption of cadmium (II) from aqueous medium was studied under various conditions such as adsorbent dose, agitation time, pH and temperature of the medium to optimize the process variables. Different models including Langmuir, Freundlich, Temkin and Dubinin–Radushkevich (DR) were used to elaborate the insight of adsorption process. Best interpretation of biosorption process was given by Langmuir model. Value of maximum adsorption capacity (qm) calculated from Langmuir isotherm model was found to be 13.44 mg/g. Results indicated the establishment of physical interaction between cadmium (II) ions and functional groups of L. biomass. Kinetic study for adsorption of cadmium (II) ions on L. biomass was done by applying pseudo first order, pseudo second order, elovich and intra-particles diffusion models. Biosorption process best followed the pseudo second order kinetics. Value of standard Gibbs energy (ΔG°) and standard enthalpy change (ΔH°) showed the feasibility, spontaneity and endothermic nature of adsorption process. Percentage removal efficiency of L. biomass for cadmium (II) was successfully maintained for four cycles. Biomass has a potential to be used as an efficient adsorbent for the removal of cadmium (II) from different polluted water samples.

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Equilibrium, Kinetic and Thermodynamic Studies of Biosorption of Methylene Blue on Goethite Modified Baobab Fruit Pod (Adansonia Digitata L.)

Journal of Applied Sciences and Environmental Management ◽

10.4314/jasem.v24i7.16 ◽

2020 ◽

Vol 24 (7) ◽

pp. 1229-1243

Author(s):

A.H. Alabi ◽

E.O. Oladele ◽

A.J.O. Adeleke ◽

F.C. Oni ◽

C.A. Olanrewaju

Keyword(s):

Methylene Blue ◽

Kinetic Data ◽

Second Order ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Adansonia Digitata ◽

Adsorption Data ◽

Freundlich Adsorption Isotherm ◽

Intra Particle Diffusion ◽

Pseudo Second Order

Methylene Blue (MB) was adsorbed from aqueous solution using Baobab (Adansonia digitata L.) fruit pod and its goethite modified form. Adsorbents were characterized using Fourier Transform-Infra Red (FTIR) spectroscopy and Scanning Electron Microscopy (SEM). Batch experiments were conducted at room temperature (26.8 °C) and the adsorption data were fitted using Langmuir, Freundlich, Temkin and Dubinin- Radushkevich isotherms. Also, kinetic data was fitted using Pseudo-first order, pseudo-second order, Elovich and intra-particle diffusion models. Goethite modified baobab (GMB) appeared to have a coarse microporous surface with smoother surface and larger pore volumes compared to unmodified baobab (UB). The –C=O band was observed at 1631 and 1636 cm-1 for UB and GMB. The –OH band was observed at 3447.00 cm-1 and 3442 cm-1 for UB andGMB respectively. Langmuir model was suitable for describing the adsorption data of UB with R2 of 0.9293 while Temkin model was best for fitting adsorption data of MB on GMB with R2 of 0.9691. However, maximum adsorption capacity was obtained with Freundlich adsorption isotherm (15.4253 and 43.1301 mg/g for UB and GMB respectively). The maximum biosorption were 8.98 mg/g and 9.86 mg/g for UB and GMB respectively at pH 10. Pseudo-second-order kinetic model best fitted the kinetic data with R2 values of 0.9968 and 0.9993 for UB and GMB, ΔHo values were 83.123 KJ/mol and 361.094 KJ/mol for UB and GMB, while ΔSo values were 3.084 J/mol/ K and 1.765 J/mol/K for UB and GMB respectively. GMB adsorbed more of MB than UB and the process was endothermic. Keywords: Biosorption, Goethite, Baobab, Isotherms, Methylene blue.

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Equilibrium and kinetics studies of Direct blue 71 adsorption from aqueous solutions using modified zeolite

Adsorption Science & Technology ◽

10.1177/0263617416684836 ◽

2017 ◽

Vol 36 (1-2) ◽

pp. 80-94 ◽

Cited By ~ 5

Author(s):

Nezam Mirzaei ◽

Amir Hossein Mahvi ◽

Hooshyar Hossini

Keyword(s):

Low Cost ◽

Second Order ◽

Maximum Adsorption Capacity ◽

X Ray Diffraction ◽

Modified Zeolite ◽

X Ray ◽

Direct Blue ◽

Equilibrium And Kinetics ◽

Pseudo Second Order ◽

Direct Blue 71

This study deals with the application of Iranian zeolite as a low cost adsorbent for the removal of the Direct blue 71 (DB 71) from colored solution. Important parameters including equilibrium and contact time, initial dye concentration, effect of pH, and zeolite dosage were evaluated. Maximum dye removal was obtained at about 99.8% for 25 mg/L at 120 min of equilibrium. Higher adsorption efficiency of direct dye was obtained at higher dose and acidic pH. To analyze the adsorption equilibrium and kinetic, Langmuir, Freundlich, and Temkin isotherms as well as four kinetic models encompassing pseudo first-order, pseudo second-order, intraparticle diffusion, and Elovich were evaluated. The Langmuir isotherm ( R2 = 0.995) and pseudo second-order models, gave the best fit to equilibrium experimental data. In Langmuir analysis, the maximum adsorption capacity (qm) by 13.66 mg/g was determined. Finally, the characteristics of zeolite including both natural and modified, such as compositions, surface morphology by X-ray diffraction technique (XRD), X-ray fluorescence (XRF), and scanning electron microscopy (SEM) were obtained. According to XRF analysis, it was demonstrated that Al2O3 and SiO2 are the most part of natural and modified zeolite. Furthermore, the clinoptilolite was determined as the significant crystalloid phase by XRD pattern.

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