Preparation and characterization of chitosan/clay composite for direct Rose FRN dye removal from aqueous media: comparison of linear and non-linear regression methods

Kausar, Abida; Naeem, Kashaf; Hussain, Tariq; Nazli, Zill-i-Huma; Bhatti, Haq Nawaz; Jubeen, Farhat; Nazir, Arif; Iqbal, Munawar

doi:10.1016/j.jmrt.2018.07.020

Cited by 142 publications

(46 citation statements)

References 47 publications

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“…It was experimented that by enhancing the initial concentration of dye, removal efficiency of dye decreased. These results are comparable with photo-oxidation of Reactive Red 2 and Direct Yellow 12 dyes that decreases with increase in initial dye concentration [31,37]. The results are shown in (figure 5).…”

Section: Effect Of Dye Concentrationsupporting

confidence: 76%

“…The ·OH radicals generated attack the disperse violet 63 framework at different positions like, unsaturation points. In several such attacks the disperse violet 63 get converted into CO 2 and hetero-atoms which are further mineralized [29][30][31][32]. Results showed that degradation rate of disperse violet 63 was enhanced due to hydrogen peroxide.…”

Section: Effect Of H 2 O 2 Concentrationmentioning

confidence: 99%

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UV/H₂O₂, UV/H₂O₂/SnO₂ and Fe/H₂O₂ based advanced oxidation processes for the degradation of disperse violet 63 in aqueous medium

Bokhari

Ahmad

Jilani³

et al. 2020

Mater. Res. Express

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The photodegradation of disperse violet 63 dye was investigated in aqueous solution using UV/H 2 O 2 , UV/H 2 O 2 /SnO 2 and Fenton reagent. The maximum decolorization was achieved in 60 min with 50 mg l −1 of dye concentration. The suitability of each process depends upon dye concentration. The photo degradation is very effective at low dye concentration. The degradation percentage increased by enhancing initial amount of hydrogen peroxide and UV irradiation time. The influence of operational parameters like pH, H 2 O 2 concentration, catalyst amount and dye concentration were investigated. After 60 min reaction time, the maximum decolorization of disperse violet 63 with UV/H 2 O 2, UV/H 2 O 2 /SnO 2 and Fe/H 2 O 2 was 81%, 92.7% and 96.4% respectively. The results indicated that Fenton process had more photocatalytic activity for degradation of disperse violet 63 dye than that of UV/H 2 O 2 and UV/H 2 O 2 /SnO 2 . After 60 min, the comparative decomposition order was Fe/H 2 O 2 >UV/H 2 O 2 /SnO 2 >UV/H 2 O 2. It may be concluded that Fenton process could possibly be used for the remediation of toxic pollutants from textile effluents.

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Section: Effect Of Dye Concentrationsupporting

confidence: 76%

Section: Effect Of H 2 O 2 Concentrationmentioning

confidence: 99%

UV/H₂O₂, UV/H₂O₂/SnO₂ and Fe/H₂O₂ based advanced oxidation processes for the degradation of disperse violet 63 in aqueous medium

Bokhari

Ahmad

Jilani³

et al. 2020

Mater. Res. Express

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“…The pseudo‐first‐order and pseudo‐second‐order kinetic models can be written according to following equations, respectively 41,42 :

\log ((), q_{e} - q_{t}) = \log ((), q_{e}) - \frac{k_{1} . t}{2.303},

\frac{t}{q_{t}} = \frac{1}{k_{2} {q_{e}}^{2}} + \frac{t}{q_{e}},

where q t and q e are adsorption capacities at time t and at equilibrium time (mg/g), respectively; k 1 and k 2 are the rate constants for pseudo‐first‐order and pseudo‐second‐order models; and t is contact time (min). For determining the k 1 and the amount of predicted q e , we can apply a linear form of the pseudo‐first‐order model, in the plot of log( q e − q t ) versus t. Also, k 2 and equilibrium adsorption capacity of the pseudo‐second‐order model can also be calculated by slope of the plot of t/q e versus t. In addition, h = k 2 .q e 2 regards as initial sorption rate 42–44 …”

Section: Resultsmentioning

confidence: 99%

“…To enhance the understanding of the spontaneity nature and heat change of adsorption process, essential thermodynamic parameters such as Gibbs free energy change ΔG (kJ/mol), entropy change ΔS (kJ/mol.K), and enthalpy change ΔH (kJ/mol) should be evaluated. Gibbs free energy change is given by 44,45

Δ G = - italicRTlnK = italicΔH - italicTΔS .

Likewise, the relationship between constant K and temperature can be obtaining by van't Hoff equation:

\ln K = \frac{Δ S}{R} - \frac{Δ H}{RT},

where K (L/mol) is the equilibrium adsorption constant of isotherm fits, R (8.314 J.mol/K) is universal gas constant, and T is the temperature in Kelvin.…”

Section: Resultsmentioning

confidence: 99%

Impact of operating conditions for the continuous‐flow removal of dye effluents in a fixed‐bed reactor using light expanded clay aggregate as a green adsorbent with ultrasound‐assisted desorption

Moradi

Rahimpour

Salehi

et al. 2020

Asia-Pacific J Chem Eng

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The adsorption of Reactive Red 33 dye from aqueous solution onto light expanded clay aggregate (LECA) in a batch mode, fixed-bed reactor has been investigated. The adsorption studies were determined as a function of dye initial concentration, pH, flow rate, temperature, and adsorbent size using response surface methodology. The maximum amount of dye removal (85.11%) was obtained in the optimized conditions (pH = 2, C 0 = 20 mg/L, and T = 20 C; flow rate: 40 L/min and smaller size of LECA granules). Also, highfrequency ultrasound waves have been applied for desorption process which improved the desorption efficiency by 81%. Equilibrium data are fitted well with Langmuir isotherm model and obeyed the Weber-Morris and external diffusion kinetic models. The exothermic nature and negative amount of Gibbs free energy change confirmed the spontaneous nature of this process. The maximum adsorption capacity, q max , as estimated by Langmuir isotherm model was 1.363 mg/g.

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“…The reported techniques showed promising efficiency for endosulfan removal. However, all the techniques are not equal regarding cost and efficiency [19][20][21][22][23]. Some techniques are responsible for secondary pollution and produce toxic degradation intermediate.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and photocatalytic performance of iron molybdate (Fe₂(MoO₄)₃) for the degradation of endosulfan pesticide

Parveen

Bhatti

Ashar

et al. 2020

Mater. Res. Express

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Iron molybdate was prepared via simple solution chemistry method and the photocatalytic degradation of a pesticide (endosulfan) was investigated under visible light irradiation. As-prepared (Fe 2 (MoO 4 ) 3 ) was characterized using scanning electron microscope (SEM), x-ray diffraction (XRD), energy dispersive x-ray spectra (EDX), diffused reflectance spectroscopy (DRS) and Zeta particle sizer techniques. The iron molybdate crystallite size was 36 nm, while grain size was in the range of 160-340 nm. The particles of polymetallic compound were spherical, highly porous and with fluffy texture indicating high surface area. DRS revealed Fe 2 (MoO 4 ) 3 was active under visible region since band gap value calculated was 2.7 eV. Response surface methodology (RSM) was employed for the optimization of photocatalytic activity (PCA) of Fe 2 (MoO 4 ) 3 as a function of catalyst dose, H 2 O 2 dose, solution pH and concentration of endosulfan and up to 77% degradation was achieved at optimum conditions, which was monitored by UV/vis spectroscopy. In response to endosulfan degradation, the chemical oxygen demand (COD) and total organic carbon (TOC) were reduced up to 76% and 67%, respectively. Results revealed that iron molybdate is highly efficient photocatalyst for the degradation of endosulfan under solar light irradiation and could possibly be used for the treatment of endosulfan containing wastewater.

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Preparation and characterization of chitosan/clay composite for direct Rose FRN dye removal from aqueous media: comparison of linear and non-linear regression methods

Cited by 142 publications

References 47 publications

UV/H₂O₂, UV/H₂O₂/SnO₂ and Fe/H₂O₂ based advanced oxidation processes for the degradation of disperse violet 63 in aqueous medium

UV/H₂O₂, UV/H₂O₂/SnO₂ and Fe/H₂O₂ based advanced oxidation processes for the degradation of disperse violet 63 in aqueous medium

Impact of operating conditions for the continuous‐flow removal of dye effluents in a fixed‐bed reactor using light expanded clay aggregate as a green adsorbent with ultrasound‐assisted desorption

Synthesis, characterization and photocatalytic performance of iron molybdate (Fe₂(MoO₄)₃) for the degradation of endosulfan pesticide

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Preparation and characterization of chitosan/clay composite for direct Rose FRN dye removal from aqueous media: comparison of linear and non-linear regression methods

Cited by 142 publications

References 47 publications

UV/H2O2, UV/H2O2/SnO2 and Fe/H2O2 based advanced oxidation processes for the degradation of disperse violet 63 in aqueous medium

UV/H2O2, UV/H2O2/SnO2 and Fe/H2O2 based advanced oxidation processes for the degradation of disperse violet 63 in aqueous medium

Impact of operating conditions for the continuous‐flow removal of dye effluents in a fixed‐bed reactor using light expanded clay aggregate as a green adsorbent with ultrasound‐assisted desorption

Synthesis, characterization and photocatalytic performance of iron molybdate (Fe2(MoO4)3) for the degradation of endosulfan pesticide

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Product

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About

UV/H₂O₂, UV/H₂O₂/SnO₂ and Fe/H₂O₂ based advanced oxidation processes for the degradation of disperse violet 63 in aqueous medium

UV/H₂O₂, UV/H₂O₂/SnO₂ and Fe/H₂O₂ based advanced oxidation processes for the degradation of disperse violet 63 in aqueous medium

Synthesis, characterization and photocatalytic performance of iron molybdate (Fe₂(MoO₄)₃) for the degradation of endosulfan pesticide