Modifying cellulose with metaphosphoric acid and its efficiency in removing brilliant green dye

Silva, Fabrícia de Castro; Silva, Marcia Maria Fernandes da; Lima, Luciano Clécio Brandão; Osajima, Josy Anteveli; Filho, Edson Cavalcanti da Silva

doi:10.1016/j.ijbiomac.2018.03.089

Cited by 28 publications

(8 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At the pH values higher than pHpzc, the surface charge was negative and attracted positively charged dye while at lower pH values, the surface charge was positive and attracted negatively charged dye. 32,33 It was found that the final pH of the solutions at the end of the adsorption was found to be 7.5 after the initial pH of 5 for SW500, and about 10.8 for SW800 in all the studied initial pHs., Before the pH pzc , the adsorption efficiencies of BG and MG for SW500 were as low as expected because of electrostatic repulsion. As seen in Figure 4, the adsorption efficiencies of BG were above 98% for SW500 after the initial pH of 5 (final solution pH 7.5 for SW500).…”

Section: Effect Of Ph On Bg and Mg Removalmentioning

confidence: 91%

Sandpaper Wastes as Adsorbent for the Removal of Brilliant Green and Malachite Green Dye

Coşkun

Aksuner

Yanık

2019

ACSi

View full text Add to dashboard Cite

Sandpaper wastes were used as adsorbent after pyrolysis at 500 °C and calcination at 800 °C for the removal of brilliant green and malachite green cationic dye from an aqueous solution. The effects of the pH, the adsorbent dose, the contact time, and the initial dye concentration on the removal efficiencies were investigated. The isotherm studies were conducted by using the Langmuir, Freundlich, and Dubinin-Radushkevich models, and thermodynamic studies were also performed. The adsorption of the Brilliant green and malachite green were found to comply with the Langmuir isotherm model and the Freundlich isotherm model, respectively. The thermodynamic studies showed that the adsorption of dyes were endothermic. The E values obtained from the Dubinin-Radushkevich isotherm showed that the adsorption mechanism was chemical in nature. Furthermore, the three kinetic models (pseudo first-order, pseudo second-order, and intraparticle diffusion) were investigated. It was found that the pseudo second-order kinetic model fitted well for adsorption of dyes.

show abstract

Section: Effect Of Ph On Bg and Mg Removalmentioning

confidence: 91%

Sandpaper Wastes as Adsorbent for the Removal of Brilliant Green and Malachite Green Dye

Coşkun

Aksuner

Yanık

2019

ACSi

View full text Add to dashboard Cite

show abstract

“…The zero-charge point (PCZ) is the pH value at which the adsorption of potential-determining ions (H + and OH -) are equal. To determine the PCZ, the methodology proposed by Silva et al (2018) [23] and Hassan et al (2019) [24] with modifications. The tests consisted of the addition of 20 mg of the adsorbent (100 µm) in 20 mL of aqueous solution of NaCl 0.1 mol•L -1 , under different conditions of initial pH (3.5; 4; 5; 6; 7; 8; 9; 10; 11), adjusted with 3 M HCl or NaOH solutions.…”

Section: Determination Of the Zero-charge Point (Phpcz)mentioning

confidence: 99%

“…Cellulose acquires a positive charge that, by electrostatic attraction, binds to negatively charged dyes [30,31,47]. In order to prove this behavior on the surface of cellulose as a function of pH, a preliminary study of the acid-base behavior of the surface of these adsorbents in an aqueous medium was carried out by determining the PCZ [23,24] as shown in Figure 3D.…”

Section: Influence Of Ph On the Adsorption Capacity Of Bacterial Cellmentioning

confidence: 99%

Removal of Remazol Black B dye using bacterial cellulose as an adsorbent

et al. 2021

View full text Add to dashboard Cite

Effluents from textile processes, when discarded of inappropriately, have been shown to be a major environmental concern. In this way, different methods can be used, among them adsorption is an economical and efficient technique in the removal of dyes. Therefore, we propose to analyze the adsorptive capacity of bacterial cellulose (CB) against effluents containing the dye Remazol Black B (RBB). CB was produced by the bacterium Gluconacetobacter hansenii and characterized by the techniques of FTIR, DRX, TGA / DTG and pH (PCZ). The RBB removal tests were initially performed at different pHs. From the best experimental condition, new tests were performed at temperatures of 30, 40, 60 and 100 ± 2 °C, 150 rpm, pH 3.5, using 0.5 g of adsorbent in the concentrations of dye from 25 to 65 mg•L -1 . The kinetic study showed that the system balance was achieved in 80 minutes. The experimental data were better described by the pseudosecond order model. The equilibrium results showed that the experimental data fit the Langmuir model (qmax 17.513 mg•g -1 ). The thermodynamic parameters of adsorption showed that the process is exothermic, not spontaneous and also presented low system randomness. The activation energy (Ea) was 23.8 kJ•mol -1 characterizing physical adsorption. The residual water was not toxic to animal or microbial cells. Bacterial cellulose proved to be a good low-cost adsorbent, easy to acquire and which can be used in the adsorption process.

show abstract

“…Apart from these, several studies revolve around the use of different chemical materials to modify CNCs and utilize them as adsorbents for water purification. [67][68][69][70][71][72] An investigation was conducted by Rafieian et al, [42] involving the preparation and characterization of a membrane, consisting of (3 aminopropyl)triethoxysilane or APTESmodified CNC (MCNC) and a nonwoven substrate at the bottom for removing heavy metals like copper ions present in water. It was observed that MCNC was responsible for the improvement of fouling resistance and water flux of the polyethersulfone (PES)/MCNC membrane and increased efficiency in metal ion removal.…”

Section: Removal Of Heavy Metal Ionsmentioning

confidence: 99%

Nanocellulose as a sustainable material for water purification

et al. 2020

View full text Add to dashboard Cite

The demand for purified water has been increasing day by day. More feasible technologies, including membrane filtration, adsorbents, and so forth have emerged out to be more efficient and cheaper over conventional industrial methods. Nanocellulose, being biodegradable, nontoxic, and sustainable nanofiller exhibits excellent mechanical properties, high aspect ratio, high surface area, and more importantly tunable surface chemistry; is a potential candidate to be employed for water purification. Composite membranes and films for water filtration, constituting of biopolymers have gathered immense interest lately. Compared with its unmodified form, the functionalized NC enhances the compatibility with the matrix and readily forming strong network structures; essential for the formation of channels for better adsorption of impurities and higher water flux. This review highlights some of the recent studies dedicated to making and testing of nanofiltration membranes prepared using nanocellulose and its different functionalized derivatives.

show abstract

Modifying cellulose with metaphosphoric acid and its efficiency in removing brilliant green dye

Cited by 28 publications

References 58 publications

Sandpaper Wastes as Adsorbent for the Removal of Brilliant Green and Malachite Green Dye

Sandpaper Wastes as Adsorbent for the Removal of Brilliant Green and Malachite Green Dye

Removal of Remazol Black B dye using bacterial cellulose as an adsorbent

Nanocellulose as a sustainable material for water purification

Contact Info

Product

Resources

About