Swelling and kinetic investigations of basic blue-3 sorption by polyacrylamide/Gum Arabic hybrid hydrogel in aqueous medium

Abstract Removal of noxious dyes from waste water is highly desirable for the safety of humans, aquatic life and natural environment. The issue was addressed in the present work by one pot fabrication of polyacrylamide/Gum Arabic (pAAm/GA) composite hydrogel which was applied as sorbent for basic blue-3 (BB3) eradication. The synthesis of the material was confirmed by scanning electron microscopy (SEM), Fourier Transformed Infrared (FTIR) spectroscopy and thermo gravimetric analysis (TGA). Besides, the same techniques also evidenced BB3 uptake by the hydrogel. In distilled water, the swelling capacities of the hydrogel was investigated at pH 7 and the nature of water diffusion into the hydrogel was probed from the resultant data. The composite hydrogel reached equilibrium point in 24 h after which no appreciable water absorption occurred. The adsorption of BB3 by the hybrid material was comprehensively investigated which involved the effect of contact time, temperature and pH on the sorption capacity of the hybrid sorbent. The obtained data fitted well into pseudo second order kinetic model and the adsorption took place in three consecutive kinetic phases. Moreover, sorption thermodynamics revealed non spontaneous and endothermic nature of BB3 sorption accompanied with increase in degree of order.

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Application of radiation grafted waste polypropylene fabric for the effective removal of Cu (II) and Cr (III) ions

Journal of Polymer Engineering ◽

10.1515/polyeng-2021-0177 ◽

2022 ◽

Vol 0 (0) ◽

Author(s):

Md. Nabul Sardar ◽

Nazia Rahman ◽

Shahnaz Sultana ◽

Nirmal Chandra Dafader

Keyword(s):

Adsorption Capacity ◽

Metal Ion ◽

Aqueous Media ◽

Thermo Gravimetric Analysis ◽

Ion Concentration ◽

Gravimetric Analysis ◽

Order Kinetic ◽

Polypropylene Fabric ◽

Alternative Material ◽

Waste Polypropylene

Abstract This study focuses on the adsorption of hazardous Cr (III) and Cu (II) ions from aqueous solution by applying modified waste polypropylene (PP) fabric as an adsorbent. Pre-irradiation technique was performed for grafting of sodium styrene sulfonate (SSS) and acrylic acid (AAc) onto the PP fabric. The monomer containing 8% SSS and 16% AAc in water was used. Graft yield at 30 kGy radiation dose was 390% when 4% NaCl was added as additive. The prepared adsorbent was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermo-gravimetric analysis (TGA) and dynamic mechanical analyzer (DMA). The influences of different parameters including pH, contact time, temperature and initial metal ion concentration were also investigated. The equilibrium adsorption data were better fitted to the Langmuir isotherm model with maximum monolayer adsorption capacity 384.62 mg/g for Cr (III) and 188.68 mg/g for Cu (II) ions. The kinetic data were better explained by pseudo first-order kinetic model having good matching between the experimental and theoretical adsorption capacity. The adsorption process was spontaneous, endothermic and thermodynamically feasible. Furthermore, investigation of desorption of metal ions and reuse of the adsorbent suggesting that the adsorbent is an efficient and alternative material in the removal of Cr (III) and Cu (II) from aqueous media.

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Preparation of grafting copolymer of acrylic acid onto loess surface and its adsorption behavior

Water Science & Technology ◽

10.2166/wst.2020.359 ◽

2020 ◽

Vol 82 (4) ◽

pp. 673-682

Author(s):

Fengqin Tang ◽

Di Gao ◽

Li Wang ◽

Yufeng He ◽

Pengfei Song ◽

...

Keyword(s):

Acrylic Acid ◽

Adsorption Capacity ◽

Removal Rate ◽

Vinyl Pyrrolidone ◽

Mineral Particle ◽

Gravimetric Analysis ◽

Order Kinetic ◽

Experimental Conditions ◽

Order Kinetic Model ◽

Grafting Copolymer

Abstract Loess is a typical natural mineral particle distributed widely around the world, and it is inexpensive, readily accessible, and harmless to the environment. In this study, loess was modified by surface grafting copolymerization of functional monomers, such as acrylic acid, N-vinyl pyrrolidone, and N,N-methylenebisacrylamide as a cross-linking agent, which afforded a novel loess-based grafting copolymer (LC-PAVP). After being characterized by scanning electron microscopy, thermal gravimetric analysis and Fourier-transform infrared spectroscopy, its adsorption capacity and mechanism of removing lead ions (Pb2+) were investigated. With the study of the optimal experimental conditions, it was demonstrated that the removal rate of Pb2+ by LC-PAVP can reach up to 99.49% in 60 min at room temperature. It was also found that the kinetic characteristics of the adsorption capacity due to the pseudo-second-order kinetic model and the thermodynamics conformed well with the Freundlich model. In summary, as a lost-cost and eco-friendly loess-based adsorbent, LC-PAVP is a good potential material for wastewater treatment.

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Removal of Cadmium from Contaminated Water Using Coated Chicken Bones with Double-Layer Hydroxide (Mg/Fe-LDH)

Water ◽

10.3390/w12082303 ◽

2020 ◽

Vol 12 (8) ◽

pp. 2303

Author(s):

Saif S. Alquzweeni ◽

Rasha S. Alkizwini

Keyword(s):

Heavy Metals ◽

Agitation Speed ◽

Hydroxyl Groups ◽

Order Kinetic ◽

Hydrogen Binding ◽

Aquatic Life ◽

Surface Precipitation ◽

Chicken Bone ◽

Wide Range ◽

Order Kinetic Model

Occurrence of heavy metals in freshwater sources is a grave concern due to their severe impacts on public health and aquatic life. Cadmium (Cd2+) is one of the most dangerous heavy metals, and can cause serious diseases even at low concentrations. Hence, a wide range of treatment technologies exist, such as nanofiltration and biological reactors. In this context, the present investigation aims at the development of a new adsorption medium, made from chicken bones coated with iron (Fe) and magnesium (Mg) hydroxides, to remove cadmium from water. This novel chicken bone functional substance was manufactured by applying layered double hydroxides (LDH) into the chicken bones. Initially, the new adsorption medium was characterized using Fourier-transform infrared spectroscopy (FTIR technology), then it was applied to remove cadmium from water under different conditions, including pH of water (3–7.5), agitation speed (50–200 rpm), adsorbent dose (1–20 g per 100 mL), and contact time (30–120 min). Additionally, the reaction kinetics were studied using a pseudo-first order kinetic model. The results obtained from the present study proved that the new adsorption medium removed 97% of cadmium after 120 min at an agitation speed of 150 rpm, pH of 5, and adsorption dose of 10 g per 100 mL. The results also showed that the new adsorption medium contains a significant number of functional groups, including hydroxyl groups. According to the outcomes of the kinetic study, the mechanism of removing metal is attributed to surface precipitation, ion exchange, complexation, hydrogen binding between pollutants, and the LDH-chicken bone substance.

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One-Step Preparation of Chitosan-Based Magnetic Adsorbent and Its Application to the Adsorption of Inorganic Arsenic in Water

Molecules ◽

10.3390/molecules26061785 ◽

2021 ◽

Vol 26 (6) ◽

pp. 1785

Author(s):

Zhe Jiang ◽

Nian Li ◽

Pei-Ying Li ◽

Bo Liu ◽

Hua-Jie Lai ◽

...

Keyword(s):

Adsorption Process ◽

Thermo Gravimetric Analysis ◽

Arsenic Concentration ◽

Inorganic Arsenic ◽

Batch Adsorption ◽

Gravimetric Analysis ◽

Order Kinetic ◽

Magnetic Adsorbent ◽

Adsorption Model ◽

One Step

Chitosan is a kind of biodegradable natural polysaccharide, and it is a very promising adsorber material for removing metal ions from aqueous solutions. In this study, chitosan-based magnetic adsorbent CMC@Fe3O4 was synthesized by a one-step method using carboxymethyl chitosan (CMC) and ferric salts under relatively mild conditions. The Fe3O4 microspheres were formed and the core–shell structure of CMC@Fe3O4 was synthesized in the meantime, which was well characterized via SEM/TEM, XRD, VSM, FT-IR, thermo gravimetric analysis (TGA), XPS, size distribution, and zeta potential. The effects of initial arsenic concentration, pH, temperature, contact time, and ionic strength on adsorption quantity of inorganic arsenic was studied through batch adsorption experiments. The magnetic adsorbent CMC@Fe3O4 displayed satisfactory adsorption performance for arsenic in water samples, up to 20.1 mg/g. The optimal conditions of the adsorption process were pH 3.0, 30−50 °C, and a reaction time of 15 min. The adsorption process can be well described by pseudo-second-order kinetic model, suggesting that chemisorption was main rate-controlling step. The Langmuir adsorption model provided much higher correlation coefficient than that of Freundlich adsorption model, indicating that the adsorption behavior is monolayer adsorption on the surface of the magnetic adsorbents. The above results have demonstrated that chitosan-based magnetic adsorbent CMC@Fe3O4 is suitable for the removal of inorganic arsenic in water.

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Gum Arabic-Magnetite Nanocomposite as an Eco-Friendly Adsorbent for Removal of Lead(II) Ions from Aqueous Solutions: Equilibrium, Kinetic and Thermodynamic Studies

Separations ◽

10.3390/separations8110224 ◽

2021 ◽

Vol 8 (11) ◽

pp. 224

Author(s):

Ismat H. Ali ◽

Mutasem Z. Bani-Fwaz ◽

Adel A. El-Zahhar ◽

Riadh Marzouki ◽

Mosbah Jemmali ◽

...

Keyword(s):

Electron Microscopy ◽

Aqueous Solutions ◽

Contact Time ◽

Gum Arabic ◽

Ion Concentration ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Transmission Electron ◽

Order Kinetic Model ◽

Langmuir Isotherm Model

In this study, a gum Arabic-magnetite nanocomposite (GA/MNPs) was synthesized using the solution method. The prepared nanocomposite was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), and thermogravimetric analysis (TGA). The prepared composite was evaluated for the adsorption of lead(II) ions from aqueous solutions. The controlling factors such as pH, contact time, adsorbent dose, initial ion concentration, and temperature were investigated. The optimum adsorption conditions were found to be 0.3 g/50 mL, pH = 6.00, and contact time of 30 min. The experimental data well fitted the pseudo-second-order kinetic model and the Langmuir isotherm model. The maximum adsorption capacity was determined as 50.5 mg/g. Thermodynamic parameters were calculated postulating an endothermic and spontaneous process and a physio-sorption pathway.

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Preparation of Ca/Al-Layered Double Hydroxides/Biochar Composite with High Adsorption Capacity and Selectivity toward Cationic Dyes in Aqueous

BULLETIN OF CHEMICAL REACTION ENGINEERING AND CATALYSIS ◽

10.9767/bcrec.16.2.10211.244-252 ◽

2021 ◽

Vol 16 (2) ◽

pp. 244-252

Author(s):

Risfidian Mohadi ◽

Neza Rahayu Palapa ◽

Aldes Lesbani

Keyword(s):

Adsorption Capacity ◽

Surface Area ◽

Cationic Dyes ◽

Order Kinetic ◽

Aquatic Life ◽

Adsorption Study ◽

Order Kinetic Model ◽

Mutagenic Effects ◽

Double Hydroxide ◽

Double Hydroxides

Widely reports have evaluated the use of biochar (BC) composites to layered double hydroxide (LDH) to adsorb dyes from wastewater. However, its applicability for adsorbing a mixture of cationic dyes such as Malachite green (MG), Rodhamine-B (Rh-B), and Methylene blue (MB), which causes carcinogenic and mutagenic effects on aquatic life, has not been studied. In this work, we compared the performance of CaAl-LDH/BC adsorbent with or without the addition of BC in the adsorption of cationic dyes. The adsorption study was prepared in a batch system using various temperatures, concentrations, and also contact time. The results of the characterization of Ca/Al-Biochar composite showed the unique diffraction of XRD pattern, and also showed two characteristics of starting materials. Surface area analysis by BET method showed Ca/Al-Biochar composite has a higher surface area than starting material. The results of the adsorption study of MG showed that Ca/Al-Biochar follows the pseudo-second-order kinetic model. The adsorption capacity of MG on Ca/Al-Biochar was up to 71.429 mg/g and shows selectivity toward MG in an aqueous solution. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Removing lead ions from aqueous solutions by the thiosemicarbazide grafted multi-walled carbon nanotubes

Water Science & Technology ◽

10.2166/wst.2017.198 ◽

2017 ◽

Vol 76 (2) ◽

pp. 302-310 ◽

Cited By ~ 2

Author(s):

Ying Zhou ◽

Jingang Yu ◽

Xinyu Jiang

Keyword(s):

Carbon Nanotubes ◽

Aqueous Solutions ◽

Adsorption Process ◽

Lead Ions ◽

Maximum Adsorption Capacity ◽

Gravimetric Analysis ◽

Order Kinetic ◽

Order Kinetic Model ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

A novel multi-walled carbon nanotubes (MWCNTs) material functionalized with thiosemicarbazide was synthesized successfully and used to remove lead ions from aqueous solutions. The technologies of Fourier Transform Infrared Spectroscopy, scanning electron microscopy and thermal gravimetric analysis were used to characterize the structure and properties of thiosemicarbazide grafted MWCNTs. The adsorption conditions, such as pH, contact time and temperature, were investigated. The results showed pH affected the adsorption process greatly, and the adsorption process reached equilibrium within 60 min. The maximum adsorption capacity was 42.01 mg/g. The adsorption process fitted well with the pseudo-second-order kinetic model and the Langmuir model. The thermodynamic parameters indicated the adsorption process was endothermic and spontaneous in nature.

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Synthesis of a new magnetic nanocomposite hydrogel based on poly(vinyl acetate-co-maleic anhydride)/melamine for efficient dye removal

Journal of Elastomers & Plastics ◽

10.1177/0095244318824380 ◽

2019 ◽

Vol 52 (1) ◽

pp. 70-89 ◽

Cited By ~ 1

Author(s):

Hanieh Rezazadeh ◽

Peyman Najafi Moghadam ◽

Saeideh Ehsanimehr ◽

Amir Reza Fareghi

Keyword(s):

Maleic Anhydride ◽

Vinyl Acetate ◽

Magnetic Nanocomposite ◽

Order Kinetic ◽

Nanocomposite Hydrogel ◽

Solution Ph ◽

One Pot ◽

X Ray ◽

Order Kinetic Model ◽

Magnetic Nanocomposite Hydrogel

In this work, we fabricated a novel magnetic nanocomposite hydrogel based on poly(vinyl acetate- co-maleic anhydride)/melamine. A simple one-pot method was applied to fabricate the nanocomposite, and its adsorption capacity was investigated using Congo red (CR) dye. Then, the effects of a variety of parameters such as adsorbent dosage, solution pH, initial dye concentration, and contact time on the efficiency of the adsorbent were evaluated. The optimal adsorption of CR on the adsorbent was observed at pH 5 with 10 mg adsorbent and 10 mg L−1 initial dye concentrations where the adsorption efficiency reached above 90%. The Langmuir model was applied for fitting the adsorption isotherm of CR obtained on the proposed nanocomposite hydrogel, and it was observed that the adsorption process most probably followed a pseudo-second-order kinetic model. The obtained results showed that the proposed nanocomposite adsorbent could be used in water treatment. It was characterized with different techniques including X-ray diffraction, Fourier transform infrared spectroscopy, field-emission scanning electron microscopy, vibrating sample magnetometer, and energy dispersive X-ray.

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Sorption Behavior of Methylene Blue From Aqueous Solution By Using PVA/SA/Kaolin Composite

Issue 4 - Journal of Science and Technology ◽

10.46243/jst.2020.v5.i4.pp199-213 ◽

2020 ◽

pp. 199-213

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Metal Ion ◽

Physical Adsorption ◽

Thermo Gravimetric Analysis ◽

Blue Dye ◽

Sorption Behavior ◽

Gravimetric Analysis ◽

Order Kinetic ◽

Batch Mode

This research shows a method of elimination of methylene blue from aqueous solutions using PVA/SA/Kaolin Composite. The prepared was characterized by Fourier transform infra red spectroscopy (FTIR), X-Ray diffractogram (XRD), Thermo gravimetric analysis (TGA) and Scanning electron microscopic (SEM). Furthermore, the analyses of batch mode experiments were performed to study the experimental important parameters such as pH, metal ion concentrations, adsorbent dosages and contact time are discussed. From the experimental data, the adsorption isotherms are well described by Langmuir and Freundlich model, the adsorption of methyleneblue was fitted with Freundlich isotherm confirms the physical adsorption phenomena involved in this process. The kinetic parameter was correlated with the pseudo-second-order kinetic model. From the results, it was concluded that the material of PVA/SA/Kaolin Composite is an excellent adsorbent for the removal of methylene blue dye from aqueous solution.

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Nano-SiO2/DBN: An efficacious and reusable catalyst for one-pot synthesis of tetrahydrobenzo[b]pyran derivatives

10.21203/rs.3.rs-240450/v1 ◽

2021 ◽

Author(s):

Maryam Mehravar ◽

Bi Bi Fatemeh Mirjalili ◽

Elaheh Babaei ◽

Abdolhamid Bamoniri

Keyword(s):

Thermo Gravimetric Analysis ◽

Reaction Times ◽

Reusable Catalyst ◽

Gravimetric Analysis ◽

Thermo Gravimetric ◽

One Pot ◽

Short Reaction Time ◽

X Ray ◽

High Yields ◽

Exposed Surface Area

Abstract Background: The nano-sized particles enhance the exposed surface area of the active part of the catalyst, thereby increasing the contact between precursors and catalyst considerably. In this study, nano-SiO2/1,5-diazabicyclo[4.3.0]non-5-en was synthesized, characterized and used as a heterogeneous nanocatalyst for the synthesis of tetrahydrobenzo[b]pyran derivatives. Fourier Transform Infrared Spectroscopy, Field Emission Scanning Electron Microscopy, Brunauer–Emmett–Teller plot, Energy Dispersive X-ray Spectroscopy and Thermo Gravimetric Analysis were used to discern nano- SiO2/1,5-diazabicyclo[4.3.0]non-5-en.Results: Tetrahydrobenzo[b]pyrans were synthesized by using nano- SiO2/1,5-diazabicyclo[4.3.0]non-5-en via one-pot three-component condensation of malononitrile, aldehydes and dimedone in H2O/EtOH at 60 °C. The results indicate that tetrahydrobenzo[b]pyrans were synthesized in good to high yields and short reaction times.Conclusions: The fundamental privileges of this method are short reaction time, plain procedure, recyclability of catalyst and high yields of products.

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