Fabrication of 3D Porous Polyvinyl Alcohol/Sodium Alginate/Graphene Oxide Spherical Composites for the Adsorption of Methylene Blue

2020 ◽  
Vol 20 (4) ◽  
pp. 2205-2213 ◽  
Author(s):  
Ying-Xia Ma ◽  
Xin Li ◽  
Wen-Jie Shao ◽  
Ya-Lan Kou ◽  
Hai-Peng Yang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Sodium Alginate

Removal of methylene blue and Lead (II) via PVA/SA double cross-linked network gel beads loaded Fe3O4@KHA nanoparticles

2021 ◽  
Author(s):  
Niu Yuhua ◽  
Han Xingxing ◽  
Song Jie ◽  
Huang Liangxian
Keyword(s):  
Methylene Blue ◽  
Polyvinyl Alcohol ◽  
Sodium Alginate ◽  
Potassium Humate ◽  
Gel Beads ◽  
Ferroferric Oxide ◽  
Double Cross

Novel magnetic gel beads were successfully fabricated via polyvinyl alcohol (PVA) and sodium alginate (SA) double cross-linked network loaded ferroferric oxide@potassium humate (Fe3O4@KHA) nanoparticles. PVA/SA/Fe3O4@KHA gel beads were found to...

Synthesis and characterization of crosslinked membranes based on sodium alginate/polyvinyl alcohol/graphene oxide for ultrafiltration applications

2021 ◽  
Vol 230 ◽  
pp. 204-218
Author(s):  
Asma Rhimi ◽  
Khira Zlaoui ◽  
Bart Van der Bruggen ◽  
Karima Horchani-Naifer ◽  
Dorra Jellouli Ennigrou
Keyword(s):  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Sodium Alginate ◽  
Synthesis And Characterization

scholarly journals Batch and fixed-bed column study for p-nitrophenol, methylene blue, and U(VI) removal by polyvinyl alcohol–graphene oxide macroporous hydrogel bead

2017 ◽  
Vol 77 (1) ◽  
pp. 91-100 ◽  
Author(s):  
Dan Chen ◽  
Jun Zhou ◽  
Hongyu Wang ◽  
Kai Yang
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Fixed Bed ◽  
Column Experiments ◽  
Maximum Adsorption Capacity ◽  
Fixed Bed Column ◽  
Hydrogel Bead ◽  
Bdst Model ◽  
Adsorption Capacities

Abstract There is an increasing need to explore effective and clean approaches for hazardous contamination removal from wastewaters. In this work, a novel bead adsorbent, polyvinyl alcohol–graphene oxide (PVA-GO) macroporous hydrogel bead was prepared as filter media for p-nitrophenol (PNP), dye methylene blue (MB), and heavy metal U(VI) removal from aqueous solution. Batch and fixed-bed column experiments were carried out to evaluate the adsorption capacities of PNP, MB, and U(VI) on this bead. From batch experiments, the maximum adsorption capacities of PNP, MB, and U(VI) reached 347.87, 422.90, and 327.55 mg/g. From the fixed-bed column experiments, the adsorption capacities of PNP, MB, and U(VI) decreased with initial concentration increasing from 100 to 400 mg/L. The adsorption capacities of PNP, MB, and U(VI) decreased with increasing flow rate. Also, the maximum adsorption capacity of PNP decreased as pH increased from 3 to 9, while MB and U(VI) presented opposite tendencies. Furthermore, the bed depth service Time (BDST) model showed good linear relationships for the three ions' adsorption processes in this fixed-bed column, which indicated that the BDST model effectively evaluated and optimized the adsorption process of PVA-GO macroporous hydrogel bead in fixed-bed columns for hazardous contaminant removal from wastewaters.

scholarly journals Study on the Adsorption of Methylene Blue on Graphene Oxide/ Polyvinyl Alcohol Composite Film 

2021 ◽  
Vol 31 (1) ◽  
pp. 28-32
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Equilibrium State ◽  
Composite Film ◽  
Adsorption Capacity ◽  
Optimum Conditions

With the aim of investigate the adsorption capacity of graphene oxide/polyvinyl alcohol (GO/PVA) polymer (the adsorbent), methylene blue is selected as an object to assess the adsorption capacity. The results showed that, after 93 minutes, the adsorption get the equilibrium state and 86% of methylene blue is adsorbed. Temperature, pH are also studied to find the optimum conditions for the adsorption where by pH 7 has the highest adsorption capacity and in the base environment, the obtained adsorption capacity is very low (<0,15 mg/g).. Repeated this process triple times on the same adsorbent (the adsorbent is treated after using each time), there is still 80% of methylene blue is adsorbed. This make save the money and protect the environment so this material promises to be a suitable alternate for adsorbents.

scholarly journals Denitrification performance of Pseudomonas fluorescens Z03 immobilized by graphene oxide-modified polyvinyl-alcohol and sodium alginate gel beads at low temperature

2020 ◽  
Vol 7 (3) ◽  
pp. 191542 ◽  
Author(s):  
Meizhen Tang ◽  
Jie Jiang ◽  
Qilin Lv ◽  
Bin Yang ◽  
Mingna Zheng ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Low Temperature ◽  
Polyvinyl Alcohol ◽  
Pseudomonas Fluorescens ◽  
Sodium Alginate ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Extracellular Polymeric Substances ◽  
Aerobic Denitrification ◽  
Gel Beads

Improving the effect of microbial denitrification under low-temperature conditions has been a popular focus of research in recent years. In this study, graphene oxide (GO)-modified polyvinyl-alcohol (PVA) and sodium alginate (SA) (GO/PVA–SA) gel beads were used as a heterotrophic nitrification–aerobic denitrification (HN–AD) bacteria ( Pseudomonas fluorescens Z03) carrier to enhance nitrogen removal efficiency levels at low temperatures (6–8°C). The removal efficiency of N H 4     + -N and N O 3       − -N and the variations in concentrations of extracellular polymeric substances (EPS) under different GO doses (0.03–0.15 g l −1 ) were studied. The results indicated that the addition of GO can improve the efficiency of nitrogen removal, and the highest removal efficiency level and highest carbohydrate, protein, and total EPS content levels (50.28 mg, 132.78 mg and 183.06 mg (g GO/PVA–SA gel) −1 , respectively) were obtained with 0.15 g l −1 GO. The simplified Monod model accurately predicted the nitrogen removal efficiency level. These findings suggested that the application of GO serves as an effective means to enhance nitrogen removal by stimulating the activity of HN–AD bacteria.

Graphene oxide encapsulated polyvinyl alcohol/sodium alginate hydrogel microspheres for Cu (II) and U (VI) removal

2018 ◽  
Vol 158 ◽  
pp. 309-318 ◽  
Author(s):  
Xiaofeng Yi ◽  
Fuliang Sun ◽  
Zhenhua Han ◽  
Fuhao Han ◽  
Jiarui He ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Sodium Alginate ◽  
Alginate Hydrogel ◽  
Hydrogel Microspheres
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