Adsorption of Phenol in Wastewater Using Nano Grapheme Oxide-Chitosan-Bentonite Absorbent

2020 ◽  
Vol 11 (4) ◽  
pp. 368-380
Author(s):  
Alireza Jadid ◽  
Shadab Shahsavari ◽  
Aliakbar Seifkordi ◽  
Ali Vaziri Yazdi
Keyword(s):  
Graphene Oxide ◽  
Adsorption Process ◽  
Removal Rate ◽  
Physical Adsorption ◽  
Phenol Removal ◽  
Phenol Adsorption ◽  
Absorption Isotherm ◽  
Optimum Formulation ◽  
Nano Graphene ◽  
Kinetics Of

Background and Objectives: Contamination of surface and groundwater sources with aromatic compounds such as phenolic compounds is one of the newest environmental problems that humans encountered it today. One of the ways to remove these pollutants is the use of polymeric adsorbents. In this study, chitosan-bentonite-nano-graphene oxide nanosorbent was synthesized to investigate the phenol adsorption. Material and Methods: In this research, experimental design was performed using Design-Expert 7.0 software to investigate the effect of independent variables including nano graphene oxide, chitosan and bentonite on the dependent variable (phenol removal rate). Moreover, phenol absorption isotherm, kinetics and thermodynamics, were also examined. Results: Eventually, the optimum formulation of nano-adsorbent with specifications of 0.1 g of chitosan, 0.18 g of bentonite and 0.07 g of nano-graphene oxide was investigated. Optimal adsorption conditions were also obtained at a concentration of 100 ppm, pH=5 and 45 minutes of absorption time. Conclusion: Finally, it was found that the synthesized nanosorbent follows the Langmuir isotherm, which represents physical adsorption, and also the kinetics of the adsorption process is the diffusion between particles. As a result, it was found that the optimal application of this nano-adsrbent is in wastewaters with a temperature of less than 400 °C.

scholarly journals Removal of Sulfadiazine Using 3D Interconnected Petal-Like Magnetic Reduced Graphene Oxide (MrGO) Nanocomposites

Water ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1933
Author(s):  
Jie Zhong ◽  
Yong Feng ◽  
Jin-Ling Li ◽  
Bin Yang ◽  
Guang-Guo Ying
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Removal Rate ◽  
Physical Adsorption ◽  
Polluted Water ◽  
Adsorption Performance ◽  
Economic Methods ◽  
Reduced Graphene ◽  
Pure Fe3o4 ◽  
Magnetic Reduced Graphene Oxide

Adsorption has been regarded as one of the most efficient and economic methods for the removal of antibiotics from aqueous solutions. In this work, different graphene-based magnetic nanocomposites using a modified solvothermal method were synthesized and employed to remove sulfadiazine (SDZ) from water. The adsorption capacity of the optimal magnetic reduced graphene oxide (MrGO) was approximately 3.24 times that of pure Fe3O4. After five repeated adsorption cycles, the removal rate of SDZ (100 μg/L) by MrGO nanocomposites was still around 89.3%, which was only about a 3% decrease compared to that in the first cycle. Mechanism investigations showed that both chemical and physical adsorption contributed to the removal of SDZ. The excellent adsorption performance and recyclability of MrGO nanocomposites could be attributed to their wonderful 3D interconnected petal-like structures. The MrGO with SDZ could be easily recollected by magnetic separation. The MrGO also exhibited excellent adsorption performance in the purification of real polluted water.

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.

Adsorption Kinetics of Lignite Activated Carbon in Treating Coal Gasification Wastewater

2014 ◽  
Vol 1073-1076 ◽  
pp. 955-959
Author(s):  
Ruo Zheng Li ◽  
Hong Yang ◽  
Xin Jin
Keyword(s):  
Activated Carbon ◽  
Coal Gasification ◽  
Adsorption Process ◽  
Physical Adsorption ◽  
Second Order ◽  
Pseudo Second Order ◽  
Coal Gasification Wastewater ◽  
New Treatment ◽  
Kinetics Of ◽  
Adsorption Activation Energy

Lignite activated carbon was provided through lignite which is treated specially. The adsorption capacity and mechanism of COD from Coal gasification wastewater by lignite activated carbon have been studied.The adsorption capacities of lignite activated carbon at different times were obtained by concentration of COD in the remainder solution. Three simplified kinetic models: pseudo-first-order, pseudo-second-order, intraparticle diffusion equations were adopted to examine the mechanism of the adsorption process. The results showed that the adsorption can be expressed by the pseudo-second-order model. The adsorption balance capacity was obtained as 50.8mg·g-1 (298K), and the adsorption balance capacity decreased with increasing of temperature, which showed that the adsorption process was exothermic. The adsorption activation energy (Ea) was calculated as 5.76kJ·mol-1, and it showed that the adsorption process was Physical adsorption. This study explored new treatment channels for lignite comprehensive utilization..

Removal of Phenol from Aqueous Solutions by Adsorption onto Amine-Modified Fly Ash Cenospheres (FACs)

2014 ◽  
Vol 878 ◽  
pp. 226-233
Author(s):  
Yu Xin Sun ◽  
Jin Zhang
Keyword(s):  
Fly Ash ◽  
Aqueous Solutions ◽  
Adsorption Process ◽  
Photoelectron Spectra ◽  
Adsorptive Capacity ◽  
Phenol Removal ◽  
Solution Ph ◽  
Phenol Adsorption ◽  
X Ray ◽  
Fly Ash Cenospheres

Removal of phenols from waters and wastewaters is an important issue in order to protect public health and environment. In an effort to develop an effective adsorbent for removal of phenol from aqueous solutions, fly ash cenospheres (FACs), the solid wastes generated from a coal-firing power plant, were modified with an amino-terminated organosilicon (γ-aminopropyltriethoxysilane, KH550). Surface properties of the KH550-modified FACs (M-FACs) were characterized by the X-ray diffraction (XRD), the scanning electron microscopy (SEM) and X-ray photoelectron spectra (XPS). The characterized results showed that KH550 was successfully grated on the surface of FACs. The effects of various experimental parameters such as solution pH, adsorbent dose, and temperature upon the phenol adsorption onto M-FACs were evaluated. The results showed solution pH had a major impact on the phenol adsorption onto M-FACs, the optimum phenol removal was observed around pH 7-9. The kinetic studies indicated that the adsorption process was best described by the pseudo-second-order kinetics, suggesting that the mainly phenol adsorption process was predominantly controlled by chemical process. M-FACs presented more than double adsorptive capacity as compared with FACs. The adsorption capacity of the regenerated adsorbents could still be maintained at 83% by the fourth adsorption-desorption cycle.

Adsorption Performance of Pummelo Peel to Rhodamine B

2015 ◽  
Vol 723 ◽  
pp. 697-700
Author(s):  
Xiao Dong Li
Keyword(s):  
Waste Water ◽  
Rhodamine B ◽  
Adsorption Process ◽  
Removal Rate ◽  
Physical Adsorption ◽  
Surface Adsorption ◽  
Isothermal Adsorption ◽  
Film Diffusion ◽  
Adsorption Performance ◽  
Adsorption Condition

The adsorption performance of pummelo peel to Rhodamine B (RhB) was tested to study the adsorption regulation and optimal adsorption condition of pummelo peel to dye waste water. The results showed that the RhB removal rate of 0.4 g pummelo peel to 100 mL 140 mg·L-1 RhB reached above 83 % under the condition of 30 °C, pH 8 and 60 min. The theroretical saturation adsorpion amount of pummelo peel was 133 mg·g-1 at 30 °C. The main adsorption pattern of pummelo peel to RhB was physical adsorption adsorption including external liquid film diffusion, surface adsorption and particle internal diffusion. The isothermal adsorption equation and secondary adsorption rate equation of Langmuir could be used to describe the adsorption process of pummelo peel to RhB.

Electrosorption Desalination by Activated Carbon Fibers Electrode

2012 ◽  
Vol 610-613 ◽  
pp. 1710-1717
Author(s):  
Gui Zhong Zhou ◽  
Xuan Wang ◽  
Zhao Feng Wang ◽  
Shu Qing Pan ◽  
Shao Xiang Li
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Adsorption Process ◽  
Removal Rate ◽  
Physical Adsorption ◽  
Activated Carbon Fiber ◽  
Activated Carbon Fibers ◽  
Initial Concentration ◽  
Total Adsorption ◽  
Scanning Electron

The activated carbon fiber(ACF) electrodes were prepared for electrosorption desalination. The electrodes were analyzed using scanning electron microscope (SEM), and the desalting efficiency was represented by the removal rate of Cl-. As a result, desalting efficiency decreases with increasing initial concentration of Cl-, whereas the total adsorption capacity increases. The most suitable voltage for electrosorption desalination is 1.2 ~ 1.4V. The electrosorption desalination achieves the best results while the distance between two electrodes is 1.0cm. Electrosorption plays a more important role in the adsorption process compared with physical adsorption. The removal rate of Cl- is obviously improved by using ACF electrode modified by HNO3 and KOH and desalination ratio of the electrode treated with KOH is increased by 16.5%. Therefore, the ACF electrode would be suitable for using in the application of electrosorption desalination.

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%.

Thermodynamics of Phenol Adsorption on the Microsphere Based on Starch

2012 ◽  
Vol 550-553 ◽  
pp. 2629-2632 ◽  
Author(s):  
Zong Cheng Miao ◽  
Fang Wang ◽  
Deng Deng ◽  
Lei Wang ◽  
Zhong Jin Li
Keyword(s):  
Adsorption Process ◽  
Physical Adsorption ◽  
Crosslinking Agent ◽  
Soluble Starch ◽  
Enthalpy Change ◽  
Raw Material ◽  
Phenol Solution ◽  
Phenol Adsorption ◽  
Starch Microsphere ◽  
Lower Temperature

In order to purify the wastewater polluted by phenol, the research of the thermodynamics of phenol adsorption on the adsorbent was very important. In this paper, a type of crosslinking starch microsphere (SM) has been synthesized by reversed phrase suspension method with soluble starch as raw material and N, N’-methylenebisacrylamide as crosslinking agent. And then the adsorption thermodynamics of SM toward phenol had been studied, and the adsorption capacity increased with the increasing of concentration of phenol solution, lower temperature ccould accelerate adsorption. The research results showed that the adsorption process was exothermic, could proceed spontaneously, and the adsorption driving force came from the enthalpy change mainly. The thermodynamic parameters of adsorption process showed that the adsorption behavior of SM towards phenol belongs to physical adsorption.

Adsorption of Volatile Phenol in Coking Wastewater by Diatomite

2012 ◽  
Vol 573-574 ◽  
pp. 648-653
Author(s):  
Qi Yuan Gu ◽  
Gen Wu ◽  
Xi Ning Lu
Keyword(s):  
Reaction Temperature ◽  
Contact Time ◽  
Removal Rate ◽  
Phenol Removal ◽  
High Concentration ◽  
Phenol Adsorption ◽  
Volatile Phenol ◽  
Organic Pollutants Removal ◽  
Alkaline Conditions ◽  
Pollutants Removal

Coal process wastewater that discharged from coal conversion processes usually contains volatile phenol in high concentration. As a natural mineral, diatomite demonstrates its excellent adsorption performance especially in organic pollutants removal. Diatomite was used for phenol removal in cokingwastewater by adsorption and the effect of diatomite dosage, contact time, salinity, intitial pH conditon and reaction temperature were investigated. It was observed that the removal rate of phenol increased with an increase in the diatomite dosage and contact time. The solution salinity could inhibit the phenol adsorption onto diatomite slightly by cometitive adsorption. Alkaline conditions were especially favorable for phenol removal. The increased reaction temperature could improve phenol adsorption to a large extent as well.

scholarly journals Removal of Lead Ions From Aqueous Solutions Using Melamine-Modified Nano Graphene Oxide

2021 ◽  
Vol 7 (2) ◽  
pp. 55-65
Author(s):  
Nazanin Parsa ◽  
Hassan Rezai
Keyword(s):  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Order Kinetic ◽  
Pseudo Second Order ◽  
Nano Graphene ◽  
Pb Concentration ◽  
Adsorbent Dose

Today, due to the industrialization of societies, the existence of heavy metals has created many problems for humans, other organisms, and the environment. Lead (Pb) is highly toxic and the second most commonly used metal. The aim of this study was to evaluate the efficiency of melamine-modified nanographene oxide in the removal of Pb from aqueous media. To increase the efficiency of graphene oxide, it was mechanically converted to nano graphene oxide and melamine (4, 2 and 6-triazine, 3, 1 and 5 triamine). Experiments were performed at pH value of 3-8, temperature of 15-50°C, Pb concentration of 5-200 mg/g, adsorbent dose of 0.01-0.06 g, and contact time of 15- 150 minutes. The mechanism of the adsorption process was investigated using two Langmuir and Freundlich isotherm models, pseudo-first order and pseudo-second order kinetic equations, and thermodynamic equations. The results showed that the adsorption rate corresponds to the Freundlich isotherm model and pseudo-second order kinetic equation. Thermodynamic studies also showed that the adsorption process is associated with increasing irregularities and it is endothermic. In constant conditions (pH of 6, contact time of 60 minutes, ambient temperature of 22°C, Pb concentration of 20 mg/L, and adsorbent dose of 0.01 g), the adsorption capacity was 191.65 mg/g. The highest adsorption occurs at the concentration of 5 mg/L and the highest adsorption capacity and removal percentage was observed at a concentration of 200 mg/L, which were 1896.3 mg/g and 98.8%, respectively. Due to the high adsorption capacity, the adsorbent was able to remove lead from the contaminated environment.

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