Characterization and optimization of spectrophotometric colour removal from dye containing wastewater by Coagulation-Flocculation

Obiora-Okafo, Ifeoma Amaoge; Onukwuli, Okechukwu Dominic

doi:10.2478/pjct-2018-0054

Cited by 28 publications

(14 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The applicability of thermally activated sodium persulfate (SPS) for the degradation of Acid Blue 92 (AB92) from its aqueous solution was investigated. The effects of pH (3)(4)(5)(6)(7)(8)(9)(10)(11), temperature (298-333 K), contact time (15-75 min), SPS concentration (0.05-0.5 mM), and initial AB92 concentrations (50-400 mg/L) on the degradation of AB92 were examined. The AB92 disintegration kinetics was studied.…”

Section: Resultsmentioning

confidence: 99%

“…The effects of different parameters such as pH (3, 5, 7, 9, and 11), contact time (10,20,40,60, and 80 min), dye concentration (50,75,100,150, and 200 mg/L), SPS concentration (0.05, 0.07, 0.09, 0.3, and 0.5 mM), and temperature (313, 323, 333, 343 and 353 K) on AB92 degradation were studied. Initially, the initial AB92 dye concentration, SPS concentration, pH, and temperature were set to be constant at 200 mg/L, 0.07 mM, 3, and 333 K, respectively.…”

Section: Experimental Procedures and Analysismentioning

confidence: 99%

“…Several techniques have been employed for the elimination of dyes from polluted waters including coagulation-flocculation [9,10], chemical treatment [11], oxidation [12,13], adsorption [14][15][16][17][18][19][20][21][22] and photocatalytic degradation [23][24][25][26][27][28][29][30][31][32][33][34][35]. Adsorption is the most widely used because of its simplicity, low cost and adsorption recovery properties in removing contaminants [36].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The application of thermally activated persulfate for degradation of Acid Blue 92 in aqueous solution

2019

View full text Add to dashboard Cite

Thermally activated persulfate (TAP) was applied for the degradation of Acid Blue 92 (AB92) dye in its aqueous solution. The effects of pH (3-11), temperature (298-333 K), contact time (15-75 min), sodium persulfate (SPS) concentration (0.05-0.5 mM) and initial AB92 concentration (50-400 mg/L) on the degradation of AB92 using TAP were examined. The initial and residual AB92 concentrations were determined spectrophotometrically at the wavelength of 260 nm and the dye mineralization was examined via the total organic carbon analysis. In addition, the chemical oxygen demand was also measured. The activation energy (E a) of AB92 degradation was calculated as 17.38 kJ mol −1 based on the Arrhenius equation. Maximum degradation efficiency of 86.47% was reached after 75 min of treatment at a pH of 5, AB92 concentration of 200 mg/L, SPS concentration of 0.5 mM and temperature of 333 K. The degradation efficiency declined with the addition of different sodium chloride concentrations and organic radical scavengers. AB92 degradation was reduced from 86.5 to 74%, 65, and 59.1% using ethylenediaminetetraacetic acid, tert-butanol, and ethanol, respectively. A kinetic model was also developed to estimate the pseudo-first-order constants as a function of the main operational parameters (initial dye concentration and TAP concentration). Decolorization rate constants (k) of 0.0009, 0.001, 0.0012, 0.0014, and 0.0018 min −1 were obtained at 303, 308, 313, 328, and 333 K, respectively, using the Langmuir-Hinshelwood kinetic model. The results obtained indicate that the TAP degradation process has great potential for the reduction of azo dyes in aqueous environments.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Experimental Procedures and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The application of thermally activated persulfate for degradation of Acid Blue 92 in aqueous solution

2019

View full text Add to dashboard Cite

show abstract

“…Therefore, wastewaters containing this type of dyes were highlighted as one of the most important threatening factors in environmental and public health [2,5]. Different studies have reported that there are several methods for removing dyes from textile wastewaters, including the application of photodecomposition [6], electrolysis [7,8], adsorption [9][10][11][12][13][14][15][16][17][18], oxidation [19], biodegradation [20], combined sonochemical and adsorption [21], coagulation-flocculation [22,23], etc.…”

Section: Introductionmentioning

confidence: 99%

Acid Dye Removal from Aqueous Solution by Using Neodymium(III) Oxide Nanoadsorbents

et al. 2020

View full text Add to dashboard Cite

In the current work, neodymium oxide (Nd2O3) nanoparticles were synthesized and characterized by means of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The major aim/investigation of this research was to fit/model and optimize the removal of Acid Blue 92 (AB92) dye from synthetic effluents (aqueous solutions) using the adsorption process based on neodymium oxide (Nd2O3) nanoparticles. To optimize the adsorption conditions, central composite design (CCD) based on response surface methodology (RSM) was applied. The effects of pH (3–9), adsorbent dosage (0.1–1 g/L), initial concentration of AB92 (100–300 mg/L), and contact time (10–100 min) on the adsorption process were investigated. Apart from equilibrium and kinetic experiments, thermodynamic evaluation of the adsorption process was also undertaken. The adsorption process was found to have the best fitting to Langmuir isotherm model and pseudo-second-order kinetic equation. Also, the process was found to be spontaneous and favorable with increased temperature. The optimal conditions found were: pH = 3.15, AB92 concentration equal to 138.5 mg/L, dosage of nanoadsorbent equal to 0.83 g/L, and 50 min as contact time, which resulted in 90.70% AB92 removal. High values for the coefficient of determination, R2 (0.9596) and adjusted R2 (0.9220) indicated that the removal of AB92 dye using adsorption can be explained and modeled by RSM. The Fisher’s F-value (25.4683) denotes that the developed model was significant for AB92 adsorption at a 95% confidence level.

show abstract

“…Coagulation is an indispensable part of traditional water treatment technology and plays an important role in removing turbidity, Chroma, and pathogenic microorganisms (Obiora-Okafo & Onukwuli, 2018;Oraeki, Skouteris, & Ouki, 2018). At present, the main research directions of coagulation technology are to develop new coagulants, optimize process parameters, and develop coagulation-based combined treatment process.…”

Section: Coagulationmentioning

confidence: 99%

Emerging pollutants—Part II: Treatment

Liu

Zhang

Chang

2019

Water Environment Research

View full text Add to dashboard Cite

Recently, emerging pollutants (EPs) have been frequently detected in urban wastewater, surface water, drinking water, and other water bodies. EPs mainly usually include pharmaceuticals and personal care products, endocrine-disrupting chemicals, antibiotic resistance genes, persistent organic pollutants, disinfection by-products, and other industrial chemicals. The potential threat of EPs to ecosystems and human health has attracted worldwide attention. Therefore, how to treat EPs in various water bodies has become one of the research priorities. In this paper, some research results on treatment of EPs published in 2018 were summarized.

show abstract

Characterization and optimization of spectrophotometric colour removal from dye containing wastewater by Coagulation-Flocculation

Cited by 28 publications

References 24 publications

The application of thermally activated persulfate for degradation of Acid Blue 92 in aqueous solution

The application of thermally activated persulfate for degradation of Acid Blue 92 in aqueous solution

Acid Dye Removal from Aqueous Solution by Using Neodymium(III) Oxide Nanoadsorbents

Emerging pollutants—Part II: Treatment

Contact Info

Product

Resources

About