Surface Modification of Fly Ash by Thermal Activation: A DR/FTIR Study

Katara, Stuti

doi:10.9734/irjpac/2014/4287

Cited by 7 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Three small peaks between 2θ = 27°and 2θ = 38°reveal the presence of faujasite, cancrinite, and mullite phases. Furthermore, a wide peak at 2θ = 43°reveals a sodalite phase, followed by a small peak of quartz at 2θ = 76° (Katara et al 2013;Musyoka et al 2011; et al 2011). Treatment of raw OFA with mixture of acids washed out almost all the minerals, as most of the tiny peaks do not exist further, as shown in Figure 2 for FA-AC.…”

Section: Resultsmentioning

confidence: 99%

Adsorption kinetics and modeling of H₂S by treated waste oil fly ash

Aslam

Hussein

Shawabkeh

et al. 2018

Journal of the Air & Waste Management Association

View full text Add to dashboard Cite

Waste oil fly ash (OFA) collected from disposal of power generation plants was treated by physicochemical activation technique to improve the surface properties of OFA. This synthesized material was further used for potential hydrogen sulfide (H 2 S) adsorption from synthetic natural gas. The raw OFA was basically modified with a mixture of acids (20% nitric acid [HNO 3 ] and 80% phosphoric acid [H 3 PO 4 ]), and it was further treated with 2 M potassium hydroxide (KOH) to enhance the surface affinity as well as surface area of synthesized activated carbon. Correspondingly, it enhanced the adsorption of H 2 S. Crystallinity, surface morphology, and pore volume distribution of prepared activated carbon were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) analyses. Fourier transform infrared (FTIR) study was also performed to identify the functional groups during different synthesis stages of modified activated carbon. The Langmuir, Freundlich, Sips, and dual-site Langmuir (DSL) models were used to study the kinetic and breakthrough behavior of H 2 S adsorption over alkali-modified activated carbon. Modeling results of isotherms indicated that OFA has dual sites with high and low affinity for H 2 S adsorption. The Clark model, Thomas model, and Yoon-Nelson model were used to examine the effects of flow rate and inlet concentration on the adsorption of H 2 S. Maximum uptake capacity of 8.5 mg/g was achieved at 100 ppm inlet concentration and flow rate of 0.2 L/min.Implications: Utilization of worthless oil fly ash from power plant is important not only for cleaning the environment but also for solid waste minimization. This research scope is to eradicate one pollutant by using another pollutant (waste ash) as a raw material. Chemical functionalization of synthesized activated carbon from oil fly ash would lead to attachment of functional groups of basic nature to attract the acidic H 2 S. Such type of treatment can enhance the uptake capacity of sorbent several times.

show abstract

Section: Resultsmentioning

confidence: 99%

Adsorption kinetics and modeling of H₂S by treated waste oil fly ash

Aslam

Hussein

Shawabkeh

et al. 2018

Journal of the Air & Waste Management Association

View full text Add to dashboard Cite

show abstract

“…FTIR spectra of TFA and Sr/TFA show a broad band between 3000-3600cm -1 ,which is attributed to -O-H Recent Advances in Petrochemical Science stretching vibration of surface silanol groups (Si-OH), [5]. A peak centered at 1608-1617cm -1 , present in all samples is assigned to bending mode (δo-H) of water molecule (Figure 1a) [6]. A small peak around 2830cm -1 is assigned to -C-H stretching vibration of organic contaminants present in TFA [7].…”

Section: Resultsmentioning

confidence: 97%

Biodiesel Production by Methanolysis of Soybean Oil over Sro Loaded Coal Fly Ash

Rani¹

2018

RAPSCI

View full text Add to dashboard Cite

Coal fly ash is converted into an efficient solid base catalyst by suitable mechanical and thermal activation followed by deposition of 15 wt% strontium carbonate to generate catalytic active sites. The activity of the catalyst was tested for biodiesel production by soybean oil methanolysis (transesterification). The physico-chemical properties of catalyst were investigated by N 2 adsorption-desorption study, FTIR and SEM analytical techniques. The catalyst could be easily regenerated and reused up to three reaction cycles with almost similar efficiency.

show abstract

“…The addition of PVA would not change the mineral composition of GBFS/fly ash geopolymer and had nothing to do with the form of PVA. Quartz, hematite, mullite, calcite, and fly ash of GBFS did not participate in the reaction and constituted the main crystal structure [ 31 , 32 ]. This indicated that the addition of PVA had no significant impact on the reaction process of geopolymer, and no new phases were produced, which mainly existed as reinforcing phases in geopolymer.…”

Section: Resultsmentioning

confidence: 99%

Improving the Mechanical Properties of Fly Ash-Based Geopolymer Composites with PVA Fiber and Powder

et al. 2022

View full text Add to dashboard Cite

In this work, polyvinyl alcohol (PVA) fiber and powder were added to geopolymer composites to toughen fly ash-based geopolymer, and their different toughening mechanisms were revealed. Firstly, different contents of active granulated blast furnace slag (GBFS) were added to the geopolymer to improve the reactivity of the GBFS/fly ash-based geopolymer, and the best ratio of GBFS and fly ash was determined through experiments testing the mechanical properties. Different contents of PVA powders and fibers were utilized to toughen the geopolymer composites. The effect of the addition forms and contents of PVA on the mechanical properties, freeze–thaw cycle resistance, and thermal decomposition properties of geopolymer composites were systematically studied. The results showed that the toughening effect of PVA fiber was better than that of PVA powder. The best compressive strength and flexural strength of geopolymer composites toughened by PVA fiber were 41.11 MPa and 8.43 MPa, respectively. In addition, the composition of geopolymer composites was explored through microstructure analysis, and the toughening mechanisms of different forms of PVA were explained. This study provided a new strategy for the toughening of geopolymer composites, which can promote the low-cost and efficient application of geopolymer composites in the field of building materials.

show abstract

Surface Modification of Fly Ash by Thermal Activation: A DR/FTIR Study

Cited by 7 publications

References 0 publications

Adsorption kinetics and modeling of H₂S by treated waste oil fly ash

Adsorption kinetics and modeling of H₂S by treated waste oil fly ash

Biodiesel Production by Methanolysis of Soybean Oil over Sro Loaded Coal Fly Ash

Improving the Mechanical Properties of Fly Ash-Based Geopolymer Composites with PVA Fiber and Powder

Contact Info

Product

Resources

About

Surface Modification of Fly Ash by Thermal Activation: A DR/FTIR Study

Cited by 7 publications

References 0 publications

Adsorption kinetics and modeling of H2S by treated waste oil fly ash

Adsorption kinetics and modeling of H2S by treated waste oil fly ash

Biodiesel Production by Methanolysis of Soybean Oil over Sro Loaded Coal Fly Ash

Improving the Mechanical Properties of Fly Ash-Based Geopolymer Composites with PVA Fiber and Powder

Contact Info

Product

Resources

About

Adsorption kinetics and modeling of H₂S by treated waste oil fly ash

Adsorption kinetics and modeling of H₂S by treated waste oil fly ash