Fundamentals of adsorption technology

Pourhakkak, Pouran; Taghizadeh, Ali; Taghizadeh, Mohsen; Ghaedi, Mehrorang; Haghdoust, Sepahdar

doi:10.1016/b978-0-12-818805-7.00001-1

Cited by 80 publications

(47 citation statements)

References 144 publications

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“…The chemical composition of two raw materials was determined by X-ray fluorescence spectroscopy (XRF, S8 Tiger Bruker), see Table 1 . The specific surface area by laser granulometry (MASTERSIZER S) and average particle sizes by BET method [ 35 ] (ASAP 2010, Micrometrics Instrument Corporation, Norcross, GA, USA) of the slag and fly ash were 1154 and 2023 m 2 /kg and 3.8 and 38.4 µm, respectively.…”

Section: Methodsmentioning

confidence: 99%

Influence of the Fly Ash Content on the Fresh and Hardened Properties of Alkali-Activated Slag Pastes with Admixtures

Hita

Criado

2022

Materials

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A study on the influence of the inclusion of slag or fly ash and five types of superplasticizers on the fresh and hardened properties of alkali-activated cements is presented. Three alkali-activated slag formulations with different fly ash content (0, 15, and 30%) in the presence of five admixtures (vinyl copolymer, melamine, and three polycarboxylates with different chain lengths) were assessed for fluidity control and setting adjustment without loss of mechanical properties. Solid sodium metasilicate was used as an alkaline activator. Their fresh and hardened properties were studied through slump, setting time, isothermal calorimetry, mechanical strengths, and porosity tests. The results showed that the increase of fly ash content delayed the reaction and improved workability but reduced compressive strengths. Concerning the admixtures, these maintained fluidity especially for the one based on polycarboxylate with very long chains. The melamine and polycarboxylate with very long chain admixtures did not have a drastic impact on mechanical properties at early ages; even a gain of flexural and compressive strength was noted.

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Section: Methodsmentioning

confidence: 99%

Influence of the Fly Ash Content on the Fresh and Hardened Properties of Alkali-Activated Slag Pastes with Admixtures

Hita

Criado

2022

Materials

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“…Then, adsorption isotherms were constructed for each sample using the Langmuir isotherm demonstrated in Equation (4):

where q m (mg/g) is the maximum adsorption capacity, and K is an empirical constant related to entropy. The equilibrium parameter (R L ) was also calculated using Equation (5) [ 34 , 35 ] to evaluate the suitability of the Langmuir isotherm in this study.

…”

Section: Methodsmentioning

confidence: 99%

Correlation of Phosphorus Adsorption with Chemical Properties of Aluminum-Based Drinking Water Treatment Residuals Collected from Various Parts of the United States

et al. 2022

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Over the past several decades, the value of drinking water treatment residuals (WTRs), a byproduct of the coagulation process during water purification, has been recognized in various environmental applications, including sustainable remediation of phosphorus (P)-enriched soils. Aluminum-based WTRs (Al-WTRs) are suitable adsorbent materials for P, which can be obtained and processed inexpensively. However, given their heterogeneous nature, it is essential to identify an easily analyzable chemical property that can predict the capability of Al-WTRs to bind P before soil amendment. To address this issue, thirteen Al-WTRs were collected from various geographical locations around the United States. The non-hazardous nature of the Al-WTRs was ascertained first. Then, their P adsorption capacities were determined, and the chemical properties likely to influence their adsorption capacities were examined. Statistical models were built to identify a single property to best predict the P adsorption capacity of the Al-WTRs. Results show that all investigated Al-WTRs are safe for environmental applications, and oxalate-extractable aluminum is a significant indicator of the P adsorption capacity of Al-WTRs (p-value = 0.0002, R2 = 0.7). This study is the first to report a simple chemical test that can be easily applied to predict the efficacy of Al-WTRs in binding P before their broadscale land application.

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“…As an adsorbent EC sludge has suitable qualities for adsorption utilization of sludge. Important adsorbent qualities are according to Pourhakkak et al (2021) The magnetite (Fe3O4) and hematite (Fe2O3) are usable as iron-based catalyst and sludge from EC system that uses dissolving Fe anodes consist these materials according to the earlier studies of Gomes et al (2007) and Lineras-Hernandez et al (2009). Also, aluminum oxides are used as catalyst for their chemical inertness, strength, and hardness.…”

Section: Utilization As Adsorbent For Humic Acid Removalmentioning

confidence: 99%

Use of Fe and Al Containing Electrocoagulation Sludge as an Adsorbent and a Catalyst in Water Treatment

Rajaniemi

Heponiemi

et al. 2023

J. Environ. Eng.

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In this study, three different electrocoagulation (EC) sludges were studied as an adsorbent (removal of humic acids) and as a catalyst (catalytic wet peroxide oxidation, CWPO, of bisphenol A (BPA).The sludges originated from electrocoagulation process in which aluminum (Al) and iron (Fe) electrodes were used for the treatment of mining industry wastewater. All the materials were used as dried sludge and as calcined material. The stability of these materials was studied in neutral and alkaline conditions with analysis of the leached iron content in solution.Based on the EC sludge characterization with X-ray fluorescence (XRF), X-ray diffractometer (XRD) and diffuse-reflectance infrared Fourier transform spectroscopy (DRIFT) different forms of Fe occurring in EC sludges were found. The Brunauer-Emmett-Teller (BET) method showed reduced surface area after calcination process. Stability of the sludges was studied in neutral conditions, and the amount of iron leaching was low (<1.4 ppm). Adsorption experiments showed that the removal of humic acids (measured as TOC) was over 50 % in all tested materials in the pH range of 3 -9, and over 92 % with the S3 calcined material in all studied pH range. The calcined samples were catalytically more active than raw material in CWPO of BPA. The highest removal of BPA was 85 % over calcined sludge. Therefore, calcined EC sludges are suitable materials for catalyst and adsorbent use. ManuscriptClick here to access/download;Manuscript;Revised3_17.10.2022_withoutMain novelty of this paper was the finding of sludge modification in the EC process of water treatment through different electrode material and current density. This modification can be made in EC water treatment process, and it may provide low-cost materials to different utilization of EC sludge.

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Fundamentals of adsorption technology

Cited by 80 publications

References 144 publications

Influence of the Fly Ash Content on the Fresh and Hardened Properties of Alkali-Activated Slag Pastes with Admixtures

Influence of the Fly Ash Content on the Fresh and Hardened Properties of Alkali-Activated Slag Pastes with Admixtures

Correlation of Phosphorus Adsorption with Chemical Properties of Aluminum-Based Drinking Water Treatment Residuals Collected from Various Parts of the United States

Use of Fe and Al Containing Electrocoagulation Sludge as an Adsorbent and a Catalyst in Water Treatment

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