scholarly journals REMOVAL OF Ni2+ FROM AQUEOUS SOLUTION BY ADSORPTION ONTO TEA WASTE–DERIVED ACTIVATED CARBON

2018 ◽  
Vol 54 (4B) ◽  
pp. 251
Author(s):  
Long Giang Bach
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Polynomial Regression ◽  
Raw Material ◽  
Regression Equations ◽  
Optimum Conditions ◽  
Tea Waste ◽  
Order Polynomial ◽  
Efficient Adsorbent ◽  
Central Composite

Activated carbon from a locally available and widespread tea waste source was fabricated, characterized and used as an efficient adsorbent for the removal of Ni2+ from aqueous solutions. The response surface methodology (RSM) and central composite design (CCD) were used to investigate the effect of the essential variables including initial concentration, adsorbent dosage and pH solution on the absorption of Ni2+. The order polynomial regression equations–based model has been developed and found to be statistically significant by values of the coefficients of determination (R2) closer than 1.0 and the P–values < 0.0001 from analysis of variance (ANOVA). Based on the predicted optimum conditions, actual experiment was employed to obtain the maximum percentage of Ni2+ removal efficiency (96.6 %). There is no doubt that the use of tea waste as abundant raw material for the preparation of activated carbon to remove Ni2+from aqueous solutions by five times with negligible change is a promising way.

scholarly journals Enzymatically hydrolysed molasses and sodium citrate as new potentials for the improvement of canthaxanthin batch synthesis by Dietzia natronolimnaea HS-1: A statistical media optimisation 

2014 ◽  
Vol 32 (No. 4) ◽  
pp. 326-336 ◽  
Author(s):  
S.M.T. Gharibzahedi ◽  
S.H. Razavi ◽  
M. Mousavi
Keyword(s):  
Yeast Extract ◽  
Polynomial Regression ◽  
Dry Weight ◽  
Regression Equations ◽  
Media Formulation ◽  
Order Polynomial ◽  
The Media ◽  
Quadratic Effects ◽  
Experimental Values ◽  
Central Composite

Response surface methodology-central composite rotatable design (RSM-CCRD) was applied to explore the optimum media formulation for maximising canthaxanthin (CTX) biosynthesis by Dietzia natronolimnaea HS-1. The effects of three variables of enzymatically hydrolysed molasses (EHM) (16.6&ndash;33.4 g/l), sodium (Na)-citrate (21.64&ndash;28.36mM), and yeast extract (6.32&ndash;9.68 g/l) concentrations on the production of CTX, total carotenoid (TCT), and biomass dry weight (BDW) were appraised. The results showed that the quadratic effects of EHM, yeast extract, and Na-citrate contents in terms of second-order polynomial regression equations (R<sup>2 </sup>= 0.968&ndash;0.986), respectively, had the most significant effects on the produced TCT and CTX. The predicted maximum accumulation of BDW (8.88 g/l), TCT (7.24 mg/l), and CTX (6.40 mg/l) under the optimum concentrations of the media variables (26.16 g/l EHM, 8.29 g/l yeast extract, and 25.86mM Na-citrate) was very close to the experimental values determined in batch experiments. The high BDW content suggested EHM and Na-citrate as very promising feedstocks for CTX bioproduction by the bacterium studied.

Simultaneous ultrasonic-assisted removal of malachite green and safranin O by copper nanowires loaded on activated carbon: central composite design optimization

RSC Advances ◽  
2015 ◽  
Vol 5 (70) ◽  
pp. 57021-57029 ◽  
Author(s):  
Mostafa Roosta ◽  
Mehrorang Ghaedi ◽  
Arash Asfaram
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Central Composite Design ◽  
Design Optimization ◽  
Malachite Green ◽  
Copper Nanowires ◽  
Ultrasonic Assisted ◽  
Ultrasound Assisted ◽  
Safranin O ◽  
Central Composite

The present study investigates the simultaneous ultrasound-assisted adsorption of malachite green (MG) and safranin O (SO) dyes from aqueous solutions by ultrasound-assisted adsorption onto copper nanowires loaded on activated carbon (Cu-NWs-AC).

scholarly journals Mespilus germanica (MG) and Tribulus terrestris (TT) Used as Biosorbents for Lead Removal from Aqueous Solutions: Adsorption Kinetics and Mechanisms

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Majid Ehteshami ◽  
Hamidreza Zolfaghari ◽  
Marjan Salari ◽  
Ehsan Teymouri
Keyword(s):  
Aqueous Solutions ◽  
Correlation Coefficient ◽  
Lead Removal ◽  
Tribulus Terrestris ◽  
Optimum Conditions ◽  
Effective Parameters ◽  
Lead Adsorption ◽  
Proposed Model ◽  
Central Composite ◽  
Solution Volume

Today, most countries around the globe are facing water resources restrictions, and it is predicted freshwater resources will be more valuable than oil wells in the next century. In the present study, the ability of lead removal using both powders of Mespilus germanica (MG) and Tribulus terrestris (TT) seeds and optimization of the adsorption process have been investigated. Four main parameters were selected for experimental design, namely, pH, time of contact, the ratio of adsorbent to solution volume, and initial concentration of lead in solution, and the optimization of effective parameters on lead adsorption was performed based on central composite design (CCD) under response surface methodology (RSM). According to the statistical results, the proposed model for MG and TT is confirmed with 0.95 and 0.96 correlation coefficient and 0.92 and 0.94 adjusted correlation coefficient, respectively. The results of parameter optimization also showed that both adsorbents have the acceptable ability to adsorb lead from aqueous solutions. Under the optimum conditions with the initial lead concentration of 10 mg/l, MG powder had better performance in lead adsorption of 96.04%, and TT powder also had an acceptive performance of 93.20%. Moreover, the MG and TT adsorbents have the most accordance with the Freundlich and D-R isotherms, respectively.

scholarly journals Sequestration of hexavalent chromium from aqueous solutions by activated carbon derived from Macadamia nutshells

2016 ◽  
Vol 75 (1) ◽  
pp. 196-206 ◽  
Author(s):  
V. E. Pakade ◽  
O. B. Nchoe ◽  
L. Hlungwane ◽  
N. T. Tavengwa
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Hexavalent Chromium ◽  
Activated Carbons ◽  
Cost Effective ◽  
Sorption Process ◽  
Freundlich Model ◽  
Optimum Parameters ◽  
Effective Removal ◽  
Efficient Adsorbent

The purpose of this study was to investigate the feasibility of activated carbons prepared from Macadamia nutshells as an efficient adsorbent for the removal of hexavalent chromium (Cr(VI)) from aqueous solutions. The activated carbon was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), CHNS analyzer and Brunauer–Emmett–Teller (BET). For effective removal of Cr(VI), the optimum parameters found were pH 2, 120 min of contact time and 0.2 g of sorbent. The adsorption data fitted well into the Freundlich model, suggesting a multilayer sorption process. The results demonstrated that Macadamia activated carbon could be used as cost-effective biosorbent for the treatment of aqueous solutions contaminated by Cr(VI) with an adsorption capacity of 22.3 mg g−1. The mode of removal involved adsorption and reduction of Cr(VI) to Cr(III).

Removal of Cu2+ from Aqueous Water by Adsorption onto the Efficient and Recyclable Durian Shell-Derived Activated Carbon

2018 ◽  
Vol 876 ◽  
pp. 46-51 ◽  
Author(s):  
Long Giang Bach ◽  
Dai Viet Nguyen Vo ◽  
Nguyen Duy Trinh ◽  
Van Thi Thanh Ho ◽  
Van Thuan Tran
Keyword(s):  
Activated Carbon ◽  
Langmuir Model ◽  
Raw Material ◽  
P Value ◽  
Optimal Conditions ◽  
Considerable Decrease ◽  
Maximum Capacity ◽  
Monolayer Adsorption ◽  
Confirmation Test ◽  
Order Polynomial

We investigated the use of durian shell-derived activated carbon (DSAC) for the removal of Cu2+. To determine the optimal condition for Cu2+ removal, the response surface methodology (RSM) was used to establish a second-order polynomial model with variables such as Cu2+ concentration (Ci), adsorbent dosage (dDSAC) and pH. With R2 = 0.9847 and P-value < 0.0001, the model was proved to be statistically significant. The RSM based confirmation test revealed that the removal of Cu2+ was maximum (99.6%) at optimal conditions: Ci = 61.6 mg/L, dDSAC = 5.0 g/L and pH = 5.2. Based on calculated R2, data fitness for adsorption isotherms were positioned as follows: Langmuir > Tempkin > Freundlich. In other words, monolayer adsorption was the most favorable behavior with maximum capacity of 76.92 mg/g from Langmuir model. Interestingly, DSAC was reused at least five times without a considerable decrease of Cu2+ removal efficiency. Therefore, durian shell can be used as a highly effective, reusable and promising raw material to fabricate the activated carbon.

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