scholarly journals Bentonite and Magnetite Filler-Modified Polyurethane Foam in Fixed Bed Column for the Adsorption of Mercury(II) Ions from Aqueous Solution

2021 ◽  
Vol 10 (1) ◽  
pp. 27-36
Author(s):  
Siti Sarah ◽  
Adisalamun Adisalamun ◽  
Darmadi Darmadi ◽  
Suraiya Kamaruzzaman ◽  
Abrar Muslim ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Polyurethane Foam ◽  
Pore Volume ◽  
Linear Models ◽  
Removal Rate ◽  
Fixed Bed ◽  
Simple Method ◽  
Non Linear

This paper proposed adsorbent development by synthesizing polyurethane foam (PUF) using a simple method, mixing polyol with isocyanate and adding fillers of bentonite and magnetite to the PUF matrix. The study's main objective was to produce a PUF-based adsorbent with high reactivity to remove Hg2+ in wastewater. This bentonite and magnetite filler-modified polyurethane foam (BMPUF) adsorbent was fixed in a bed column for the adsorption of mercury (II) ions from an aqueous solution. The effect of initial Hg2+ concentration on the removal rate and the effect of contact time on adsorption efficiency was investigated. Langmuir, Freundlich, and BET non-linear models were taken into account to determine the best adsorption isotherm fitting and obtain adsorption capacity, intensity, and pore volume. As a result, it followed the non-linear Freundlich model, and the average adsorption capacity and intensity were 0.466 mg/g and 0.923, respectively. The average BET-based pore volume obtained was 0.782 L/mg. The kinetics study showed that the non-linear pseudo-first-order kinetics model was more suitable for describing the Hg2+ adsorption kinetics. The maximum equilibrium adsorption capacity was 1.770 mg/g with the adsorption rate of 0.0013 min-1 based on the non-linear model. The effect of varying bentonite and magnetite ratio on adsorption isotherm and kinetics was also investigated. Overall, the potential application of BMPUF adsorbent in the adsorption of mercury (II) ions was demonstrated in the current study. 

Study on Adsorption of U(VI) From Aqueous Solution by Activated MgO

2017 ◽  
Author(s):  
Qingqing Liu ◽  
Xiaoyan Li
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Removal Rate ◽  
Freundlich Isotherm ◽  
Batch System ◽  
15Mg Dose ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Kinetics Of

The activated MgO was synthesized by microwave homo-precipitator method and characterized by SEM, EDS and FT-IR methods. It was used to adsorption of U(VI) from aqueous solution with batch system. The paper discussed the effect of pH, temperature, contact time, adsorbent dose and initial U(VI) concentration on the adsorption. The results showed that activated MgO has good adsorption capacity for U(VI), the removal rate and equilibrium adsorption capacity reached 83.5% and 84.04mg·g−1 at pH 5.0, 15mg dose and 313K,respectively. The adsorption kinetics of U(VI) onto activated MgO were better fitted with pseudo-second-order kinetic.The adsorption isotherm data were fitted well to Freundlich isotherm model.The thermodynamic parameters showed that the adsorption process is endothermic and spontaneous.

scholarly journals Removal of triphenylmethane dye from aqueous solutions through an adsorption process over waste materials

2020 ◽  
Vol 10 (4) ◽  
pp. 5772-5779
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Dye Removal ◽  
Functional Group ◽  
Adsorption Process ◽  
Removal Rate ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Pseudo Second Order ◽  
Best Fit

Water pollution is the most significant issue due to rapid growing industrial development especially textile dye industry. Therefore, the adsorption process experiment was conducted to determine the removal ability of the adsorbent chosen. The removal rate and adsorption capacity of Phenol red and Cresol were analyzed by using eggshell adsorbent in the adsorption process. The experiment was conducted with parameters of initial concentration, dosage, pH and contact time. Results indicated that the removal rate achieved more than 90% and the adsorption capacity exceeded more than 5 mg/g. The functional group before adsorption process eggshell adsorbent and after adsorption process eggshell adsorbent was analyzed by using FTIR (Fourier Transform Infrared Spectroscopy). The study of adsorption isotherm and kinetics model was carried out to identify the efficiency of the eggshell adsorbent reacting with the dye solution. The adsorption isotherm that applied in this research was Langmuir isotherm, Jovanovic isotherm and Freundlich isotherm. Moreover, Pseudo-first-order and Pseudo-second-order chosen were conducted to determine the kinetic studies. In short, eggshell adsorbent is highly effective on dye removal through adsorption capacity. The functional group of the eggshell adsorbent was found such as alcohols, phenol, alkanes, carbonyls, ester, saturated aliphatic, aldehydes, aromatics, 2°amines and phosphorus. For kinetics study, Freundlich isotherm was analyzed as the best fit isotherm model as it achieved the highest R2 value which is closed to 1 and Pseudo-second-order was analyzed as the best fit kinetic model in this experiment. Therefore, eggshell adsorbent is highly effective in dye removal.

scholarly journals Improvement of aqueous solution coexisting with arsenite and arsenate using iron mixed porous clay pellets in batch and fixed-bed column studies

2019 ◽  
Vol 19 (7) ◽  
pp. 1929-1937 ◽  
Author(s):  
Nguyen Chi Thanh ◽  
Boonchai Wichitsathian ◽  
Chatpet Yossapol ◽  
Watcharapol Wonglertarak ◽  
Borano Te
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Removal Rate ◽  
Fixed Bed ◽  
Polluted Water ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Phosphate Ions ◽  
Pseudo Second Order ◽  
Clay Pellets

Abstract Arsenic-polluted water is a global concern and puts millions of people at risk of developing cancer. The improvement of aqueous solution coexisting with arsenite and arsenate using iron mixed porous clay pellets was investigated in batch and fixed-bed column systems. Batch studies showed that the removal rate occurred in two main phases with an equilibrium time of 52 h. The pseudo-second-order model well described the experimental data. Isotherm data were well fitted by the Langmuir–Freundlich model. The removal efficiency was significantly reduced in alkaline solution and the presence of phosphate ions. The column study revealed that the breakthrough time and saturation time increased with lower feeding flow rate, higher bed height, and lower initial adsorbate concentration. The Thomas model provided good performance for predicting the column experimental data.

scholarly journals Comparative analysis of linear and nonlinear equilibrium models for the removal of metronidazole by tea waste activated carbon

2020 ◽  
Vol 82 (7) ◽  
pp. 1484-1494
Author(s):  
Peter Emmanuel Ebili ◽  
Manase Auta ◽  
Kehinde Shola Obayomi ◽  
Joseph Onyebuchi Okafor ◽  
Muibat Diekola Yahya ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Adsorption Isotherm ◽  
Active Sites ◽  
Linear Models ◽  
Physical Adsorption ◽  
Freundlich Isotherm ◽  
Cost Effective ◽  
Chi Square ◽  
Tea Waste ◽  
Non Linear

Abstract Tea waste was carbonized at 400 °C for 45 min and modified with potassium hydroxide (KOH), to enhance the active sites for the adsorption of antibiotics. The developed tea waste activated carbon (TWAC) was used as a novel eco-friendly and cost-effective adsorbent for metronidazole (MZN) removal from aqueous solution. The textural and surface properties of the adsorbent were determined using Brunauer-Emmett-Teller (BET) and FT-Raman analysis. The BET surface was found to have increased from 24.670 to 349.585 after carbonization and KOH modification. The batch experimental parameters were optimized and equilibrium time was found to be 75 min. Linear and non-linear models were carried out on the adsorption isotherm and kinetics to determine the best fit for the adsorption data. The adsorption equilibrium data were well fitted by the Freundlich isotherm and pseudo-second order models, with higher regression correlation (R2) and smaller chi-square (χ2), as predicted by the non-linear model. The thermodynamic results revealed the adsorption of MZN as spontaneous, physical, and consistently exothermic in character. The activation energy value of 7.610 kJ/mol further revealed that the adsorption process is dominated majorly by physical adsorption. The removal of MZN onto TWAC was best described by the non-linear adsorption isotherm and kinetics model.

Study on the Properties of Carboxyl Functionalized Kapok Fiber on Adsorption of Mercury (II)

2013 ◽  
Vol 791-793 ◽  
pp. 28-31
Author(s):  
Qing Shan Pan ◽  
Dai Qi Li ◽  
Jian Qiang Li ◽  
Wei Liu ◽  
Mei Gui Ma ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Microwave Power ◽  
Contact Time ◽  
Succinic Anhydride ◽  
Removal Rate ◽  
Ion Concentration ◽  
Kapok Fiber ◽  
Pretreatment Time ◽  
Equilibrium Adsorption Capacity

Modified kapok fiber (MKF) was prepared by reacting with succinic anhydride after microwave pretreatment. The preparing conditions (microwave power and pretreatment time) were optimized in this study. And the effects of MKF dosage, PH and contact time on the removal of Hg (II) ion from aqueous solution was studied, the results indicated that when the initial Hg (II) ion concentration was 100mg/L, the adsorption capacity of MKF was high effective with the MKF dose was 5g/L , PH was 4.0 and the contact time was 2h,the equilibrium adsorption capacity of MKF was 19.21 mg/g and the removal rate of Hg (II) ion was 97.13%. All the results indicated that the MKF was a effective adsorbent for removal of Hg (II) ion.

The Adsorption Isotherm Studies of Orange Peel on Pesticide Furadan

2013 ◽  
Vol 477-478 ◽  
pp. 1331-1335
Author(s):  
Guang Fu Xu ◽  
Hui Min Jing ◽  
Rui Xin Guo
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Low Cost ◽  
Agricultural Waste ◽  
Orange Peel ◽  
Maximum Adsorption Capacity ◽  
Attractive Candidate ◽  
Adsorption Data ◽  
Langmuir And Freundlich Models

Orange peel, an agricultural waste available in large quantity in China, was utilized as low-cost adsorbent to remove furadan from aqueous solution by adsorption. Adsorption isotherms were calculated and discussed. Both Langmuir and Freundlich models fitted the adsorption data quite reasonably (R2> 0.98) and the maximum adsorption capacity was 161.29 mg.g-1. The results in this study indicated that orange peel was an attractive candidate for removing furadan from the aqueous solution.

scholarly journals Adsorption of Phenol Red and Remazol Brilliant Blue R by Coconut Shells (Cocos nucifera) and Ambarella Peels (Spondias dulcis)

2020 ◽  
Vol 11 (1) ◽  
pp. 8564-8576
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Removal Rate ◽  
Cocos Nucifera ◽  
Agricultural Waste ◽  
Dye Adsorption ◽  
Brilliant Blue ◽  
Phenol Red ◽  
Remazol Brilliant Blue R ◽  
Coconut Shells

The potential of agricultural waste materials for the removal of synthetic dye, Phenol Red (PR) and Remazol Brilliant Blue R (RBBR) from aqueous solution was investigated. One of the major pollutants of water pollution, dyes, which not only result in enormous damage to the water body but also impact the organism's health, as it is highly toxic and carcinogenic by nature. Agricultural wastes are sustainable adsorbents since they are availability and low cost, which can also replace the traditional activated carbon. Therefore, this study investigated the removal of PR and RBBR from dye solution by adsorption onto the treated adsorbent. Two best out of ten adsorbents were chosen through a screening process using RBBR as a tested dye. Coconut shells (Cocos nucifera) and ambarella peels (Spondias dulcis) were selected as the main adsorbent of this study since they achieved the highest removal rate compared to others. With the selected adsorbent, the experiment was continued to study the effect of different initial dye concentration, adsorbent dosage, contact time, pH, and particle size on dye adsorption. Results show that different parameters can affect the removal rate and adsorption capacity of adsorbent in a different way. The adsorption of dye from aqueous solution onto adsorbent was evaluated using Fourier transform infrared spectroscopy (FTIR) to investigate the functional groups of adsorbent before and after the adsorption process, and it found that the functional group would affect the effectiveness or removal rate and adsorption capacity of adsorbents. The present study indicates that 99.82% of PR with an adsorption capacity of 1.05 mg/g can be removed by 5-gram ambarella peels. While coconut shells had removed 75.78% of RBBR with an adsorption capacity of 7.96 mg/g for 21 hours. The results proved that these agricultural waste were promising materials as an alternative adsorbent for the removal of dye from aqueous solution.

Fabrication of a novel graphene oxide/β-FeOOH composite and its adsorption behavior for copper ions from aqueous solution

2015 ◽  
Vol 44 (22) ◽  
pp. 10448-10456 ◽  
Author(s):  
Tingshun Jiang ◽  
Lu Yan ◽  
Lei Zhang ◽  
Yingying Li ◽  
Qian Zhao ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Copper Ions ◽  
Removal Rate ◽  
Second Order ◽  
Adsorption Behavior ◽  
Kinetics Model ◽  
Pseudo Second Order

A graphene oxide/β-FeOOH composite was prepared and its adsorption capacity was evaluated by Cu2+removal. The adsorption process was well fitted with the pseudo-second-order kinetics model. The removal rate of Cu2+reached 93.8%.

scholarly journals Facile preparation and highly efficient sorption of magnetic composite graphene oxide/Fe3O4/GC for uranium removal

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Aili Yang ◽  
Zhijun Wang ◽  
Yukuan Zhu
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Adsorption Capacity ◽  
High Efficiency ◽  
Removal Rate ◽  
Low Cost ◽  
Hydrothermal Carbonization ◽  
Maximum Adsorption Capacity ◽  
Magnetic Composite ◽  
Order Kinetic

AbstractIn this work, we reported for the first time a novel magnetic composite graphene oxide/Fe3O4/glucose-COOH (GO/Fe3O4/GC) that was facilely prepared from glucose through the hydrothermal carbonization and further combination with graphene oxide (GO). The chemical and structural properties of the samples were investigated. By the batch uranium adsorption experiments, the magnetic composite GO/Fe3O4/GC exhibits an excellent adsorption performance and fast solid–liquid separation for uranium from aqueous solution. GO/Fe3O4/GC (the maximum adsorption capacity (Qm) was 390.70 mg g−1) exhibited excellent adsorption capacity and higher removal rate (> 99%) for U(VI) than those of glucose-COOH (GC) and magnetic GC (MGC). The effect of the coexisting ions, such as Na+, K+, Mg2+, Ca2+, and Al3+, on the U(VI) removal efficiency of GO/Fe3O4/GC was examined. The equilibrium sorption and sorption rate for the as-prepared adsorbents well fit the Langmuir model and pseudo second-order kinetic model, respectively. The thermodynamic parameters (ΔH0 = 11.57 kJ mol−1 and ΔG0 < 0) for GO/Fe3O4/GC indicate that the sorption process of U(VI) was exothermic and spontaneous. Thus, this research provides a facile strategy for the preparation of the magnetic composite with low cost, high efficiency and fast separation for the U(VI) removal from aqueous solution.

Batch and fixed bed column studies on nickel (II) adsorption from aqueous solution by treated polyurethane foam

2015 ◽  
Vol 55 ◽  
pp. 112-118 ◽  
Author(s):  
L. Mangaleshwaran ◽  
A. Thirulogachandar ◽  
V. Rajasekar ◽  
C. Muthukumaran ◽  
K. Rasappan
Keyword(s):  
Aqueous Solution ◽  
Polyurethane Foam ◽  
Fixed Bed ◽  
Column Studies ◽  
Fixed Bed Column
Sign in / Sign up

Export Citation Format

Share Document