Adsorption characteristics of methylene blue onto agricultural wastes lotus leaf in bath and column modes

2011 ◽  
Vol 64 (3) ◽  
pp. 654-660 ◽  
Author(s):  
Xiuli Han ◽  
Wei Wang ◽  
Xiaojian Ma
Keyword(s):  
Methylene Blue ◽  
Fixed Bed ◽  
Isotherm Models ◽  
Column Experiments ◽  
Fixed Bed Column ◽  
Lotus Leaf ◽  
Bed Height ◽  
Column Adsorption ◽  
Equilibrium Data ◽  
Leaf Powder

The adsorption potential of lotus leaf to remove methylene blue (MB) from aqueous solution was investigated in batch and fixed-bed column experiments. Langmuir, Freundlich, Temkin and Koble–Corrigan isotherm models were employed to discuss the adsorption behavior. The results of analysis indicated that the equilibrium data were perfectly represented by Temkin isotherm and the Langmuir saturation adsorption capacity of lotus leaf was found to be 239.6 mg g−1 at 303 K. In fixed-bed column experiments, the effects of flow rate, influent concentration and bed height on the breakthrough characteristics of adsorption were discussed. The Thomas and the bed-depth/service time (BDST) models were applied to the column experimental data to determine the characteristic parameters of the column adsorption. The two models were found to be suitable to describe the dynamic behavior of MB adsorbed onto the lotus leaf powder column.

Adsorption of methylene blue by phoenix tree leaf powder in a fixed-bed column: experiments and prediction of breakthrough curves

Desalination ◽  
2009 ◽  
Vol 245 (1-3) ◽  
pp. 284-297 ◽  
Author(s):  
Runping Han ◽  
Yu Wang ◽  
Xin Zhao ◽  
Yuanfeng Wang ◽  
Fuling Xie ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Column Experiments ◽  
Fixed Bed Column ◽  
Leaf Powder ◽  
Tree Leaf

Batch and fixed-bed column adsorption of tetrabromobisphenol A onto metal organic resin: equilibrium, kinetic and mechanism studies

2020 ◽  
Vol 44 (29) ◽  
pp. 12771-12778
Author(s):  
Zhongmin Feng ◽  
Zhenghao Zhu ◽  
Ting Sun
Keyword(s):  
Fixed Bed ◽  
Tetrabromobisphenol A ◽  
Column Experiments ◽  
Fixed Bed Column ◽  
Column Adsorption ◽  
Metal Organic ◽  
Organic Resin ◽  
Contaminated Waters

MORs were prepared through fabricating MOFs and resin for effective TBBPA removal in fix-bed column experiments from contaminated waters.

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.

Continuous fixed bed adsorption of Cu(II) by halloysite nanotube–alginate hybrid beads: an experimental and modelling study

2014 ◽  
Vol 70 (2) ◽  
pp. 192-199 ◽  
Author(s):  
Yanyan Wang ◽  
Xiang Zhang ◽  
Qiuru Wang ◽  
Bing Zhang ◽  
Jindun Liu
Keyword(s):  
Adsorption Capacity ◽  
Flow Rate ◽  
Fixed Bed ◽  
Halloysite Nanotubes ◽  
Fixed Bed Column ◽  
Factors Affecting ◽  
Bed Height ◽  
Column Adsorption ◽  
Fixed Bed Adsorption ◽  
Adsorption Desorption

We used natural resources of halloysite nanotubes and alginate to prepare a novel porous adsorption material of organic–inorganic hybrid beads. The adsorption behaviour of Cu(II) onto the hybrid beads was examined by a continuous fixed bed column adsorption experiment. Meanwhile, the factors affecting the adsorption capacity such as bed height, influent concentration and flow rate were investigated. The adsorption capacity (Q0) reached 74.13 mg/g when the initial inlet concentration was 100 mg/L with a bed height of 12 cm and flow rate of 3 ml/min. The Thomas model and bed-depth service time fitted well with the experimental data. In the regeneration experiment, the hybrid beads retained high adsorption capacity after three adsorption–desorption cycles. Over the whole study, the new hybrid beads showed excellent adsorption and regeneration properties as well as favourable stability.

Adsorption of methylene blue from aqueous solution by jackfruit (Artocarpus heteropyllus) leaf powder: A fixed-bed column study

2009 ◽  
Vol 90 (11) ◽  
pp. 3443-3450 ◽  
Author(s):  
Md. Tamez Uddin ◽  
Md. Rukanuzzaman ◽  
Md. Maksudur Rahman Khan ◽  
Md. Akhtarul Islam
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Fixed Bed ◽  
Fixed Bed Column ◽  
Column Study ◽  
Leaf Powder

Waste Fungal Biomass for Mercury Biosorption – Column Studies

2007 ◽  
Vol 20-21 ◽  
pp. 623-626
Author(s):  
Lenka Svecova ◽  
Martin Kubal ◽  
Eric Guibal
Keyword(s):  
Fungal Biomass ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Inert Material ◽  
Column Experiments ◽  
Batch Experiments ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Bed Height

Granulated Tolypocladium biomass (industrial waste) was tested as mercury biosorbent in continuous mode (fixed bed column). Supplied material contained approx. 70% of fungal biomass and 30% of inert material (diatomaceous earth). Prior to column experiments, batch sorption was also performed. The results of batch experiments were compared to our previous results obtained for powdered biomass (100% biomass material) and an important drop of sorption capacity was observed. For column experiments, the bed height and flow rate were kept constant and the influence of both initial mercury concentration and bead size was investigated. The Adams Bohart, the Thomas and the Yoon and Nelson models were used for the characterization of breakthrough curves.

scholarly journals Kinetics, Equilibrium, and Thermodynamic Studies on Adsorption of Methylene Blue by Carbonized Plant Leaf Powder

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
V. Gunasekar ◽  
V. Ponnusami
Keyword(s):  
Methylene Blue ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Plant Leaf ◽  
Aqueous Effluent ◽  
Effects Of Ph ◽  
Equilibrium Data ◽  
Leaf Powder ◽  
Best Fitting ◽  
Pseudo Second Order

Carbon synthesized from plant leaf powder was employed for the adsorption of methylene blue from aqueous effluent. Effects of pH (2, 4, 6, 8, and 9), dye concentration (50, 100, 150, and 200 mg/dm3), adsorbent dosage (0.5, 1.0, 1.5, and 2.0 g/dm3), and temperature (303, 313, and 323 K) were studied. The process followed pseudo-second-order kinetics. Equilibrium data was examined with Langmuir and Freundlich isotherm models and Langmuir model was found to be the best fitting model with highR2and low chi2values. Langmuir monolayer adsorption capacity of the adsorbent was found to be 61.22 mg/g. From the thermodynamic analysis, ΔH, ΔG, and ΔSvalues for the adsorption of MB onto the plant leaf carbon were found out. From the values of free energy change, the process was found out to be feasible process. From the magnitude of ΔH, the process was found to be endothermic physisorption.

scholarly journals Statistical Optimization and Modeling of Methylene Blue Adsorption Onto Graphene Oxide in Batch and Fixed-Bed Column

2018 ◽  
Vol 5 (1) ◽  
pp. 21-34
Author(s):  
Habib Koolivand ◽  
Afsaneh Shahbazi
Keyword(s):  
Experimental Data ◽  
Methylene Blue ◽  
Graphene Oxide ◽  
Fixed Bed ◽  
Second Order ◽  
Batch Adsorption ◽  
Fixed Bed Column ◽  
Column Adsorption ◽  
Pseudo Second Order ◽  
Real Wastewater

The batch and fixed-bed column adsorption of methylene blue (MB), a widely used toxic dye, onto graphene oxide (GO) was investigated in this study. GO was synthesized using modified Hummers method and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). Response surface methodology (RSM) was employed to optimize batch and fixed-bed column adsorption of MB. Batch adsorption experiments were carried out by central composite design (CCD) with three input parameters including initial MB concentration (C0: 50-350 mg/L), GO dosage (D: 0.05-0.7 g/L), and pH (pH: 3-9). The adsorption capacity of GO for MB removal in the optimum level of factors (C0: 50 mg/L, D: 0.05 g/L, and pH: 8.5) was predicted by the model to be 700 mg/g. Adsorption kinetic data were tested using pseudo-first order, pseudo-second order, and intraparticle diffusion models. The kinetic experimental data was well fitted with pseudo-second order kinetic model (R2=1). The adsorption of MB onto GO demonstrated that Langmuir model (R2=0.999) could better fit the adsorption data than the Freundlich model (R2=0.914). Thermodynamic parameters including enthalpy (ΔH), Gibbs free energy (ΔG), and entropy (ΔS) were also investigated. Positive value of ΔH and negative value of ΔG indicated the endothermic and spontaneous nature of the adsorption. The positive value of ΔS also showed increased randomness at the solid/liquid interface during the adsorption of MB onto GO. The real wastewater experiment at optimum conditions showed high performance of adsorbent in the presence of other ions. Fixed-bed column experiments were designed using a three-factor, three-level Box-Behnken design (BBD) to investigate the single and combined effects of influent concentration (Cinf: 50-200 mg/L), flow rate (Q: 0.25-0.8 mL/min), and bed height (BH: 3-7 cm). MB removal from GO in the optimum levels of factors (Cinf: 51 mg/L, BH: 5.7 cm, and Q: 0.25 mL/min) was predicted by the model to be 86% (qe=459.3 mg/g). Fixed-bed experimental data were also fitted well to the Thomas and BDST models. The results showed that GO can be used as an efficient adsorbent for batch and fixed-bed adsorption of cationic dyes from synthetic and real wastewater.

scholarly journals FIXED-BED COLUMN ADSORPTION OF FLUOROQUINOLONE ANTIBIOTIC FROM AQUEOUS SOLUTION ONTO SUGARCANE BAGASSE BIOCHAR

2020 ◽  
Vol 58 (3A) ◽  
pp. 93
Author(s):  
Linh Thuy Nguyen ◽  
Thuy Thi Pham ◽  
Hanh Thi Nguyen ◽  
Hoai Thu Dang ◽  
Khai Manh Nguyen ◽  
...  
Keyword(s):  
Sugarcane Bagasse ◽  
Flow Rate ◽  
Fixed Bed ◽  
Column Experiment ◽  
Maximum Adsorption Capacity ◽  
Fixed Bed Column ◽  
Initial Concentration ◽  
Bed Height ◽  
Column Adsorption ◽  
Fluoroquinolone Antibiotic

The ability of the agricultural residue of sugarcane bagasse to serve as an absorbent material used to remove Ciprofloxacin, one of strong Fluoroquinolone antibiotic from aqueous solutions in fixed-bed columns was investigated. The properties of biochar sugarcane bagasse were characterized using scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectroscopy before and after modification. The results of fixed bed column experiment showed that the shape of the removal efficiency of CIP and exhaustion time was dependent on bed height, flow rate and initial concentration. The maximum adsorption capacity qo predicted from Thomas modelreached 0.955mg/g at the flow rate of 1mL/min, initial concentration of 15mg/L and bed height of 6cm. From Yoon-Nelson equation, 3.38 minutes was the time required for 50% exhaustion of 12cm bed height column with the flow rate 2mL/min and concentration 15mg/L. Thomas and Yoon-Nelson models were in good agreement with the experimental breakthrough curve data.

scholarly journals Penerapan kolom adsorpsi seri dengan adsorben sekam padi pada penyisihan logam seng (Zn) dari air tanah

2021 ◽  
Vol 12 (1) ◽  
pp. 19-26
Author(s):  
Shinta Indah ◽  
Denny Helard ◽  
Dian Ramadhan
Keyword(s):  
Rice Husk ◽  
Fixed Bed ◽  
Column Height ◽  
Rice Husks ◽  
Fixed Bed Column ◽  
Continuous Adsorption ◽  
Bed Height ◽  
Column Adsorption ◽  
In Series ◽  
Original Size

To increase the performance of continuous adsorption with rice husks as adsorbent in Zn removal from groundwater, a series of fixed bed column was applied. The experiments were carried out at the acrylic columns having diameter of 7 cm, column height of 19.5 cm, bed height of 13.5 cm and flow rate of 2 gpm/ft2 (310 mL/minute) for 540 minutes. The number of columns used were 3 columns arranged in series and the rice husk used were in their original size (1-2 mm). The influent concentration of Zn metal was 7.62 mg/L. The results showed that the use of column adsorption in series increased the removal efficiency of Zn by rice husks, from 33.21% using 1 column to 51.70% with 3 columns. The adsorption capacity of Zn obtained when using 3 columns in series was 3.542 mg/g. In addition, the use of adsorption columns in series can also prolong the saturation of the adsorbent, thereby extending its service life. The overall research results demonstrated that column the adsorption in series with rice husk as an adsorbent has the potential to be applied to remove heavy metals from groundwater.

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