Feldspar/titanium dioxide/chitosan as a biophotocatalyst hybrid for the removal of organic dyes from aquatic phases

Yazdani, Maryam Roza; Bahrami, S. Hajir; Arami, Mokhtar

doi:10.1002/app.40247

Cited by 12 publications

(3 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The characteristics of the pollutant, the adsorbent and the water matrix define the interface chemistry [30][31][32]. The pore size distribution plays a key role in NOM uptake, yet electrostatic attraction serves as the secondary controlling factor [17].…”

Section: Water Phmentioning

confidence: 99%

Tailored mesoporous biochar sorbents from pinecone biomass for the adsorption of natural organic matter from lake water

Yazdani

Duimovich

Tiraferri

et al. 2019

Journal of Molecular Liquids

View full text Add to dashboard Cite

Natural organic matter (NOM) raises major issues for drinking water treatment including undesirable taste and color, formation of carcinogenic disinfection by-products, and promotion of microbial regrowth in the water distribution system. As such, mesoporous biochars have been tailored from pine-forestry byproducts for treating NOM and color causing compounds from drinking water sources, such as lakes.Herein, several tailored biochars are fabricated via two procedures: pre-pyrolysis/activation/post-pyrolysis and activation/post-pyrolysis processes, using NaOH and ZnCl 2 activators to improve the surface chemistry and porous structure for higher NOM adsorption. The mesoporous biochars, pristine biochars, and pinecone biomass are characterized via several analysis methods including Brunauer, Emmett and Teller surface area measurement (BET), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). Batch experiments are conducted to study the adsorption isotherm, kinetics and mechanism along with desorption. Characterization revealed effective characteristics of tailored biochars for NOM adsorption including mesoporous structure, remarkable surface area (up to 1470 m 2 /g), high thermal stability, and elevated carbon content. All the tailored biochars showed improved removal capacities for NOM and color compounds from real lake water samples compared with those of the pinecone biomass and pristine biochars. The most promising tailored biochar (herein named as TB-N-I) was developed by NaOH modification via pre-and post-pyrolysis processes. With the lowest optimized dosage (0.25 g/L), TB-N-I removed more than 80 % of both NOM and color from the lake water (chemical oxygen demand (COD):13.4 and color: 53.65 mg/L), superior to the removal capacity of commercial powdered activated carbon (PAC). Acidic conditions significantly favored the adsorption, e.g. NOM removal by TB-N-I from the lake water reached 97 % at pH 2. Nonlinear regression provided a good fit for Freundlich and Sips (r 2 = 0.988 and Δq=0.08) isotherms as well as pseudo-second-order kinetic models. This suggests the heterogeneous distribution of the adsorptive sites at the biochar surface and the multilayer nature of NOM adsorption.Our desorption study revealed that more alkaline solutions resulted in higher NOM desorption (30 mM NaOH ˃ 3 mM NaOH ˃ distilled water), yielding regenerated adsorbents with high re-adsorption capacity.Liquid chromatograph-organic carbon detection (LC-OCD) was used to study the removal of different size fractions of NOM, e.g. complex humic substances and low molar mass acids. Of significant interest, low molar mass (LMM) fraction, which are more hydrophilic and resistant to conventional treatments, were effectively removed. LC-OCD indicated that TB-N-I removed 20% more of the problematic LMM compared with that of PAC. Effective pore size distribution of tailored biochar (TB-N-I) was indicated by BET analysis and was confirmed by LC-OCD results for the adsorption of NOM fractions.

show abstract

Section: Water Phmentioning

confidence: 99%

Tailored mesoporous biochar sorbents from pinecone biomass for the adsorption of natural organic matter from lake water

Yazdani

Duimovich

Tiraferri

et al. 2019

Journal of Molecular Liquids

View full text Add to dashboard Cite

show abstract

“…Chitosan (CTS) is a biopolymer emerging in the adsorption process and is derived from chitin, the second most plentiful natural polymer after cellulose [ 13 , 14 , 15 ]. It has many advantages as a bio-sorbent, such as good adsorption capacity, biodegradability, and biocompatibility [ 15 , 16 , 17 , 18 , 19 ]. As it is extracted from crustacean waste, it is eco-friendly and cost-effective compared to commonly employed adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Chitosan–Zinc(II) Complexes as a Bio-Sorbent for the Adsorptive Abatement of Phosphate: Mechanism of Complexation and Assessment of Adsorption Performance

et al. 2017

Self Cite

View full text Add to dashboard Cite

This study examines zinc(II)–chitosan complexes as a bio-sorbent for phosphate removal from aqueous solutions. The bio-sorbent is prepared and is characterized via Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM), and Point of Zero Charge (pHPZC)–drift method. The adsorption capacity of zinc(II)–chitosan bio-sorbent is compared with those of chitosan and ZnO–chitosan and nano-ZnO–chitosan composites. The effect of operational parameters including pH, temperature, and competing ions are explored via adsorption batch mode. A rapid phosphate uptake is observed within the first three hours of contact time. Phosphate removal by zinc(II)–chitosan is favored when the surface charge of bio-sorbent is positive/or neutral e.g., within the pH range inferior or around its pHPZC, 7. Phosphate abatement is enhanced with decreasing temperature. The study of background ions indicates a minor effect of chloride, whereas nitrate and sulfate show competing effect with phosphate for the adsorptive sites. The adsorption kinetics is best described with the pseudo-second-order model. Sips (R2 > 0.96) and Freundlich (R2 ≥ 0.95) models suit the adsorption isotherm. The phosphate reaction with zinc(II)–chitosan is exothermic, favorable and spontaneous. The complexation of zinc(II) and chitosan along with the corresponding mechanisms of phosphate removal are presented. This study indicates the introduction of zinc(II) ions into chitosan improves its performance towards phosphate uptake from 1.45 to 6.55 mg/g and provides fundamental information for developing bio-based materials for water remediation.

show abstract

“…At pH < pH PZC , the favorable adsorption to Cr(VI) anions by strong electrostatic attraction 47 ensures higher adsorption efficiency than at pH > pH PZC . Moreover, as shown in Supplementary Table S3 , the final pH increases after the adsorption of Cr(VI) at pH < pH PZC , which is ascribed to protonic and electronic consumption during the adsorption and reduction of Cr(VI) by CS/MGO composites 48 . The reduction process is given as the following reactions.…”

Section: Resultsmentioning

confidence: 98%

Fabrication of chitosan/magnetite-graphene oxide composites as a novel bioadsorbent for adsorption and detoxification of Cr(VI) from aqueous solution

Zhang

et al. 2018

Sci Rep

View full text Add to dashboard Cite

By utilizing the synergistic effect of chitosan (CS), magnetite (Fe3O4) particles, and graphene oxide (GO), a series of efficient and eco-friendly chitosan/magnetite-graphene oxide (CS/MGO) composites were fabricated through a facile chemical route. First, Fe3O4 particles were chemically deposited on the surface of GO to fabricate MGO hybrid. Then, chitosan was attached on MGO sheets, assembling to CS/MGO composites. According to the results of characterization, the covalent Fe-O-C bonds, electrostatic attraction, and hydrogen bonding between GO, Fe3O4, and chitosan ensure excellent structural stability and physico-chemical properties. The adsorption of Cr(VI) onto CS/MGO composites was also carried out under various conditions (content of CS, pH, initial concentration, contact time, and temperature). The CS/MGO composites possess high removal capacity for Cr(VI) from aqueous solution. Moreover, results also suggested that the CS/MGO composites had a strong reducing action for Cr(VI). When adsorption occurred, Cr(VI) and Cr(III) were simultaneously removed by CS/MGO composites. In addition, CS/MGO composites could retain good Cr(VI) removal efficiency after reuse over five cycles. CS/MGO composites are expected to have potential applications as easily regenerative bioadsorbents for Cr(VI) polluted water cleanup.

show abstract

Feldspar/titanium dioxide/chitosan as a biophotocatalyst hybrid for the removal of organic dyes from aquatic phases

Cited by 12 publications

References 36 publications

Tailored mesoporous biochar sorbents from pinecone biomass for the adsorption of natural organic matter from lake water

Tailored mesoporous biochar sorbents from pinecone biomass for the adsorption of natural organic matter from lake water

Chitosan–Zinc(II) Complexes as a Bio-Sorbent for the Adsorptive Abatement of Phosphate: Mechanism of Complexation and Assessment of Adsorption Performance

Fabrication of chitosan/magnetite-graphene oxide composites as a novel bioadsorbent for adsorption and detoxification of Cr(VI) from aqueous solution

Contact Info

Product

Resources

About