Ibuprofen uptake through dimethyl ethylenediamine modified MOF: optimization of the adsorption process by response surface methodology technique

PPy-Fe3O4/Kaolin was prepared with polypyrrole functionalized magnetic Kaolin by a simple, green, and low cost method to improve the agglomeration and low adsorption capacity of Kaolin. PPy-Fe3O4/Kaolin was employed to remove Hg2+ and the results were characterized by various methods. Relevant factors, including solution pH, dosage of adsorbent, concentration (C0), and temperature (T), were optimized by Response Surface Methodology (RSM) and Central Composite Designs (CCD). The optimal results show that the importance for adsorption factors is pH > T > C0 > dosage, and the optimal adsorption conditions of PPy-Fe3O4/Kaolin are pH = 7.2, T = 315 K, C0 = 50 mg/L, dosage of 0.05 g/L, and the capacity is 317.1 mg/g. The adsorption process conforms to the pseudo-second-order and Langmuir models. Dubinin–Radushkevich model shows that adsorption process is spontaneous and endothermic. Moreover, the adsorption of mercury by PPy-Fe3O4/Kaolin was achieved mainly through electrostatic attraction, pore diffusion, and chelation between amino functional groups and Hg2+. PPy-Fe3O4/Kaolin has excellent reproducibility, dispersity, and chemical stability, and it is easy to be separated from solution through an external magnetic field. The experiments show that PPy-Fe3O4/Kaolin is an efficient and economical adsorbent towards mercury.

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Application of Response Surface Methodology for Optimization of Methylene Blue Removal by Casuarina equitifolia Leaves Powder

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1113.745 ◽

2015 ◽

Vol 1113 ◽

pp. 745-750

Author(s):

Norzila Mohd ◽

Wan Hasnidah Wan Osman ◽

Mohd Shahrul Nizam Salleh ◽

Sarifah Fauziah Syed Draman ◽

Nurul Syahirah Abd Kahar ◽

...

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Response Surface Methodology ◽

Response Surface ◽

Adsorption Process ◽

Coefficient Of Determination ◽

Human Beings ◽

Adsorbent Dosage ◽

Mutagenic Effects ◽

Central Composite

Dye is a type of colorants that are widely used in many industries. Many dyes are toxic in nature with suspected carcinogenic and mutagenic effects that affect aquatic lives and also human beings. Adsorption process is considered as eco-friendly method to remove color from the aqueous solution compared to other established method. In this study, Casuarina Equitifolia leaves were used as an adsorbent. The Response surface methodology (RSM) was employed, using a central composite design (CCD) to optimize the three important variables, i.e., initial dye concentration, pH of the dye solution and adsorbent dosage in order to remove of methylene blue from aqueous solution. From the analysis of variance (ANOVA), the value (>0.8) of the coefficient of determination (R2) was obtained. The optimal condition was established at pH 6.91, 0.1 g adsorbent dosage and 10ppm initial methylene blue concentration. The removal efficiency was found to be 98.80%. From the findings, it shows that Casuarina Equitifolia leaves powder is suitable to be used as an adsorbent in removal of color from aqueous solution.

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Bisphenol S adsorption with activated carbon prepared from corncob: optimization using response surface methodology

International Journal of Chemical Reactor Engineering ◽

10.1515/ijcre-2019-0202 ◽

2020 ◽

Vol 18 (4) ◽

Author(s):

Xiangyang Zhang ◽

Xiuli Han ◽

Chun Chang ◽

Pan Li ◽

Hongwei Li ◽

...

Keyword(s):

Response Surface Methodology ◽

Activated Carbon ◽

Response Surface ◽

Adsorption Process ◽

Order Kinetic ◽

Bisphenol S ◽

Monolayer Adsorption ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Parameters Analysis

AbstractActivated carbon derived from raw corncob (CCAC), which prepared with steam as the activating agent, was used to adsorb bisphenol S (BPS) from aqueous solution. Characterizations of CCAC were measured by using the Brunauer-Emmett-Teller, scanning electron microscopy, and Fourier transform infrared spectroscopy. Adsorption conditions including initial BPS concentration, contact time, adsorbent dosage and pH were optimized by response surface methodology (RSM). The results show that adsorption equilibrium was well described by the Langmuir and Koble–Corrigan models. The maximum monolayer adsorption capacity of BPS was found to be 617.29 mg g−1 at 298 K. Based on the thermodynamic parameters analysis, the BPS adsorption process was turned out to be spontaneous and exothermic. The adsorption process of BPS was well described by the pseudo-second-order kinetic model. It also found that H-bonding, π–π interaction, and electrostatic interaction were the main mechanisms in the process of BPS adsorption onto the CCAC.

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A Study of the Adsorption and Removal of Sb(III) from Aqueous Solution by Fe(III) Modified Proteus cibarius with Mechanistic Insights Using Response Surface Methodology

Processes ◽

10.3390/pr9060933 ◽

2021 ◽

Vol 9 (6) ◽

pp. 933

Author(s):

Xiaojian Li ◽

Renjian Deng ◽

Zhie Tang ◽

Saijun Zhou ◽

Xing Zeng ◽

...

Keyword(s):

Response Surface Methodology ◽

Adsorption Capacity ◽

Response Surface ◽

Adsorption Process ◽

Isotherm Model ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Adsorption Time ◽

Initial Concentration ◽

Adsorbent Dose

Environmental pollution caused by excessive Sb(III) in the water environment is a global issue. We investigated the effect of processing parameters, their interaction and mechanistic details for the removal of Sb(III) using an iron salt-modified biosorbent (Fe(III)-modified Proteus cibarius (FMPAs)). Our study evaluated the optimisation of the adsorption time, adsorbent dose, pH, temperature and the initial concentration of Sb(III). We use response surface methodology to optimize this process, determining optimal processing conditions and the adsorption mechanism evaluated based on isotherm model and adsorption kinetics. The results showed that—(1) the optimal conditions for the adsorption of Sb(III) by FMPAs were an adsorption time of 2.2 h, adsorbent dose of 3430 mg/L, at pH 6.0 and temperature 44.0 °C. For the optimum initial concentration of Sb(III) 27.70 mg/L, the removal efficiency of Sb(III) reached 97.60%. (2) The adsorption process for Sb(III) removal by FMPAs conforms to the Langmuir adsorption isotherm model, and its maximum adsorption capacity (qmax) is as high as 30.612 mg/g. A pseudo-first-order kinetic model provided the best fit to the adsorption process, classified as single layer adsorption and chemisorption mechanism. (3) The adsorption of Sb(III) takes place via the hydroxyl group in Fe–O–OH and EPS–Polyose–O–Fe(OH)2, which forms a new complex Fe–O–Sb and X≡Fe–OH. The study showed that FMPAs have higher adsorption capacity for Sb(III) than other previously studied sorbents and with low environmental impact, it has a great potential as a green adsorbent for Sb(III) in water.

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Optimization of conditions for Cu(II) adsorption on D151 resin from aqueous solutions using response surface methodology and its mechanism study

Water Science & Technology ◽

10.2166/wst.2014.163 ◽

2014 ◽

Vol 69 (12) ◽

pp. 2446-2451 ◽

Cited By ~ 3

Author(s):

Hao Zhang ◽

Chunhua Xiong ◽

Fang Liu ◽

Xuming Zheng ◽

Jianxiong Jiang ◽

...

Keyword(s):

Response Surface Methodology ◽

Aqueous Solutions ◽

Adsorption Capacity ◽

Response Surface ◽

Close Agreement ◽

Adsorption Process ◽

Langmuir Model ◽

Mechanism Study ◽

Batch System ◽

Desorption Study

An experimental study on the removal of Cu(II) from aqueous solutions by D151 resin was carried out in a batch system. The response surface methodology (RSM)-guided optimization indicated that the optimal adsorption conditions are: temperature of 35 °C, pH of 5.38, and initial Cu(II) concentration of 0.36 mg/mL, and the predicted adsorption capacity from the model reached 328.3 mg/g. At optimum adsorption conditions, the adsorption capacity of Cu(II) was 321.6 mg/g, which obtained from real experiments what were in close agreement with the predicted value. The adsorption isotherms data fitted the Langmuir model well, and the correlation coefficient has been evaluated. The calculation data of thermodynamic parameters (ΔG, ΔS, and ΔH) confirmed that the adsorption process was endothermic and spontaneous in nature. The desorption study revealed that Cu(II) can be effectively eluted by 1 mol/l HCl solution, and the recovery was 100%. Moreover, the characterization was undertaken by infrared (IR) spectroscopy.

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