Optimization of boron adsorption from desalinated seawater onto UiO-66-NH2/GO composite adsorbent using response surface methodology

The current study aimed to optimize Cd(II) removal from aqueous solutions by a composite adsorbent (BCB) prepared from Alternanthera philoxeroides (AP) biochar (BC) and bentonite (BE) using response surface methodology (RSM). The results showed that the loading of BE did not significantly change the microstructure of BC but increased the number of functional groups. The X-ray diffraction (XRD) analysis showed that precipitation was the primary mechanism of Cd(II) adsorption. The adsorption behavior for Cd(II) fitted the Freundlich model. The pH, adsorbent dosage, and initial Cd(II) concentration were the main influencing factors affecting Cd(II) adsorption. There were significant interactions between pH and adsorbent dosage, adsorbent dosage, and initial concentration. The optimum adsorption conditions for Cd(II) with the maximum adsorption level of 89.4% were: 6.55 pH, 0.04 g adsorbent dosage, and 68.7 mg∙L-1 initial concentration. Overall, the BCB exhibited great potential as an efficient sorbent for the Cd(II) removal from aqueous solutions.

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Efficient removal of cationic dye mixtures from water using a bio-composite adsorbent optimized with response surface methodology

Carbohydrate Polymers ◽

10.1016/j.carbpol.2018.07.080 ◽

2018 ◽

Vol 200 ◽

pp. 305-320 ◽

Cited By ~ 8

Author(s):

Swastika Choudhury ◽

Samit Kumar Ray

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Cationic Dye ◽

Efficient Removal ◽

Composite Adsorbent

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Process Optimization Study of Zn2+ Adsorption on Biochar-Alginate Composite Adsorbent by Response Surface Methodology (RSM)

Water ◽

10.3390/w11020325 ◽

2019 ◽

Vol 11 (2) ◽

pp. 325 ◽

Cited By ~ 10

Author(s):

Subrata Biswas ◽

Manisha Bal ◽

Sushanta Behera ◽

Tushar Sen ◽

Bhim Meikap

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Metal Ion ◽

Ion Concentration ◽

Quadratic Model ◽

Effective Parameters ◽

Composite Adsorbent ◽

Independent Variables ◽

Optimization Study ◽

Adsorbent Dose

A novel biochar alginate composite adsorbent was synthesized and applied for removal of Zn2+ ions from aqueous solution. Kinetics, equilibrium and thermodynamic studies showed the suitability of the adsorbent. From a Langmuir isotherm study, the maximum monolayer adsorption capacity of the composite adsorbent was found to be 120 mg/g. To investigate the effect of process variables like initial Zn2+ concentration (25–100 mg/L), adsorbent dose (0.4–8 g/L) and temperature (298–318 K) on Zn2+ adsorption, response surface methodology (RSM) based on a three independent variables central composite design of experiments was employed. A quadratic model equation was developed to predict the relationship between the independent variables and response for maximum Zn2+ removal. The optimization study reveals that the initial Zn2+ concentration and adsorbent dose were the most effective parameters for removal of Zn2+ due to higher magnitude of F-statistic value which effects to a large extent of Zn2+ removal. The optimum physicochemical condition for maximum removal of Zn2+ was determined from the RSM study. The optimum conditions are 43.18 mg/L initial metal ion concentration, 0.062 g adsorbent dose and a system temperature of 313.5 K. At this particular condition, the removal efficiency of Zn2+ was obtained as 85%.

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