Efficient Removal of Cr (VI) with Biochar and Parameters Optimized by Response Surface Methodology

Peng, Hao; Guo, J.

doi:10.20944/preprints202103.0193.v1

Cited by 5 publications

(2 citation statements)

References 30 publications

(52 reference statements)

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“…The highest residual (difference between actual and predicted) is 2.93 for the CIP removal of 88.35%. In a plot of externally studentized residuals against predicted shown in Figure S2(c), the residuals were randomly distributed between +3.00 and −3.00, indicating that the CCD model successfully established the relationship between the independent variable and the CIP removal [68]. Overall, the diagnostic plot results agree with the coefficient of determination values of the model.…”

Section: Model Fitting and Analysis Of Variance (Anova)supporting

confidence: 63%

Enhanced Ciprofloxacin Removal from Aqueous Solution Using a Chemically Modified Biochar Derived from Bamboo Sawdust: Adsorption Process Optimization with Response Surface Methodology

Wakejo

Meshesha

Kang

et al. 2022

Adsorption Science & Technology

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Contamination of water by ciprofloxacin has become a significant concern due to its adverse health effects and growing evidence of antimicrobial-resistant gene evolution. To this end, a chemically modified bamboo biochar was prepared from bamboo sawdust to effectively remove ciprofloxacin (CIP) from an aqueous solution. Under similar adsorption conditions, the modified bamboo biochar (MBC) has an excellent CIP removal efficiency (96%) compared to unmodified bamboo biochar (UBC) efficiency (45%). Thus, MBC was used in batch adsorption experiments, and the process was optimized with the central composite design (CCD) framework of response surface methodology (RSM). Sorption process parameters such as initial CIP concentration, pH, adsorbent dose, and contact time were studied and found to have a significant effect on CIP removal. The optimal CIP removal (96%) was obtained at MBC dose (0.5 g L-1), CIP initial concentration (20 mg L-1), pH (7.5), and contact time (46 min). The adsorption kinetic data were well described by the pseudo-second-order model ( R 2 = 0.999 ), and both Langmuir ( R 2 = 0.994 ) and Freundlich ( R 2 = 0.972 ) models gave the best fit in CIP adsorption isotherm analysis. The maximum monolayer adsorption capacity of the MBC was 78.43 mg g-1 based on the Langmuir isotherm model. These results suggest that CIP adsorption was mainly controlled by chemisorption. Moreover, the CIP adsorption process was endothermic and spontaneous. Overall, MBC is a low-cost, efficient, and recyclable adsorbent for eliminating emerging contaminants such as ciprofloxacin from an aqueous solution.

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Section: Model Fitting and Analysis Of Variance (Anova)supporting

confidence: 63%

Enhanced Ciprofloxacin Removal from Aqueous Solution Using a Chemically Modified Biochar Derived from Bamboo Sawdust: Adsorption Process Optimization with Response Surface Methodology

Wakejo

Meshesha

Kang

et al. 2022

Adsorption Science & Technology

View full text Add to dashboard Cite

show abstract

“…spectrophotometer (UNICO, Model 1200) at 560 nm, in which 1,5-diphenyl carbazide interacted with Cr(VI) to create a red violet color complex after 10 minutes in a highly acidic solution of pH≈1. Using the following equation [Peng et al, 2021], the removal efficiency of Cr(VI) was estimated:…”

Section: Methodsmentioning

confidence: 99%

A Novel Rotating Fixed Bed Batch Reactor for Hexavalent Chromium Reduction

Sayed¹,

Alturki²,

Farag³

et al. 2022

J. Ecol. Eng.

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Hexavalent chromium reduction using iron powder has the advantages of being efficient and capable of degrading pollutants, as well as inexpensive and simple to procure. The performance of a new rotating fixed-bed batch reactor in treating aqueous solutions containing chromium hexavalent ions with iron powder was investigated. Two magnets were covered with iron powder and coupled with an isolated stainless-steel shaft in a new agitator design. Variables such as time, initial hexavalent chromium content, iron powder dose, rotational speed, and pH were investigated in order to discover the optimum chromium removal approach. The analysis of variance (ANOVA) was used to determine the experimental kinetics. Contact time of 21 minutes, initial Cr(VI) concentration of 30 ppm, iron powder dosage of 10 g, rpm of 276 and pH of 3 were determined to be the optimal conditions for removing hexavalent chromium.

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Efficient reduction of vanadium (V) with biochar and experimental parameters optimized by response surface methodology

Peng,

Wang,

Guo

et al. 2024

Sci Rep

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Water pollution deteriorates ecosystems and has a great threaten to the environment. The environmental benefits of wastewater treatment are extremely important to minimize pollutants. Here, the biochar purchased from the related industry was used to treat the wastewater which contained high concentration of vanadium (V). The concentration of vanadium was measured by the IC-OES and the results showed that 96.1% vanadium (V) was reduced at selected reaction conditions: the mass ratio of biochar to vanadium of 5.4, reaction temperature of 90 °C, reaction time at 60 min and concentration of H2SO4 of 10 g/L, respectively. Response surface methodology confirmed that all the experimental parameters had positive effect on the reduction of vanadium (V), which could improve the reduction efficiency of vanadium (V) as increased. The influence of each parameter on the reduction process followed the order: A (Concentration of H2SO4) > C (mass ratio of biochar to vanadium) > B (mass ratio of biochar to vanadium). Especially, the mass ratio of biochar to vanadium and concentration of H2SO4 had the greatest influence on the reduction process. This paper provides a versatile strategy for the treatment of wastewater containing vanadium (V) and shows a bright tomorrow for wastewater treatment.

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Efficient Removal of Cr (VI) with Biochar and Parameters Optimized by Response Surface Methodology

Cited by 5 publications

References 30 publications

Enhanced Ciprofloxacin Removal from Aqueous Solution Using a Chemically Modified Biochar Derived from Bamboo Sawdust: Adsorption Process Optimization with Response Surface Methodology

Enhanced Ciprofloxacin Removal from Aqueous Solution Using a Chemically Modified Biochar Derived from Bamboo Sawdust: Adsorption Process Optimization with Response Surface Methodology

A Novel Rotating Fixed Bed Batch Reactor for Hexavalent Chromium Reduction

Efficient reduction of vanadium (V) with biochar and experimental parameters optimized by response surface methodology

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