Effect of water onto porous CaO for CO2 adsorption: Experimental and extended isotherm model

Azmi, Nurulhuda; Yusup, Suzana; Sabil, Khalik M.

doi:10.1016/j.jclepro.2017.08.225

Cited by 19 publications

(3 citation statements)

References 39 publications

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“…At 45 °C, the Redlich− Peterson (R 2 = 0.9909; χ 2 = 0.003) equation fits the RHIOB equilibrium data best, while the Sips (R 2 = 0.9258; χ 2 = 0.0053) and Koble−Corrigan (R 2 = 9881; χ 2 = 0.0069) gave equal best fits to WHIOB data. The Redlich−Peterson isotherm constant β values for RHIOB at 45 °C are very close to 1 (Table S2), reducing As(III) adsorption to the Langmuir isotherm, 106,107 suggesting that RHIOB has a homogeneous adsorption surface. This agrees with predominant adsorption on the iron oxide surfaces of the hybrid adsorbent.…”

Section: Resultsmentioning

confidence: 99%

Sustainable Low-Concentration Arsenite [As(III)] Removal in Single and Multicomponent Systems Using Hybrid Iron Oxide–Biochar Nanocomposite Adsorbents—A Mechanistic Study

et al. 2020

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Rice and wheat husks were converted to biochars by slow pyrolysis (1 h) at 600 °C. Iron oxide rice husk hybrid biochar (RHIOB) and wheat husk hybrid biochar (WHIOB) were synthesized by copyrolysis of FeCl3-impregnated rice or wheat husks at 600 °C. These hybrid sorbents were characterized using X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy (SEM), SEM–energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscopy, physical parameter measurement system, and Brunauer–Emmett–Teller (BET) surface area techniques. Fe3O4 was the predominant iron oxide present with some Fe2O3. RHIOB and WHIOB rapidly chemisorbed As(III) from water (∼24% removal in first half an hour reaching up to ∼100% removal in 24 h) at surface Fe–OH functions forming monodentate Fe–OAs(OH)2 and bidentate (Fe–O)2AsOH complexes. Optimum removal occurred in the pH 7.5–8.5 range for both RHIOB and WHIOB, but excellent removal occurred from pH 3 to 10. Batch kinetic studies at various initial adsorbate–adsorbent concentrations, temperatures, and contact times gave excellent pseudo-second-order model fits. Equilibrium data were fitted to different sorption isotherm models. Fits to isotherm models (based on R 2 and χ2) on RHIOB and WHIOB followed the order: Redlich–Peterson > Toth > Sips = Koble–Corrigan > Langmuir > Freundlich = Radke–Prausnitz > Temkin and Sips = Koble–Corrigan > Toth > Redlich–Peterson > Langmuir > Temkin > Freundlich = Radke–Prausnitz, respectively. Maximum adsorption capacities, Q RHIOB 0 = 96 μg/g and Q WHIOB 0 = 111 μg/g, were obtained. No As(III) oxidation to As(V) was detected. Arsenic adsorption was endothermic. Particle diffusion was a rate-determining step at low (≤50 μg/L) concentrations, but film diffusion controls the rate at ≥100–200 μg/L. Binding interactions with RHIOB and WHIOB were established, and the mechanism was carefully discussed. RHIOB and WHIOB can successfully be used for As(III) removal in single and multicomponent systems with no significant decrease in adsorption capacity in the presence of interfering ions mainly Cl–, HCO3 –, NO3 –, SO4 2–, PO4 3–, K+, Na+, Ca2+. Simultaneous As(III) desorption and regeneration of RHIOB and WHIOB was successfully achieved. A very nominal decrease in As(III) removal capacity in four consecutive cycles demonstrates the reusability of RHIOB and WHIOB. Furthermore, these sustainable composites had good sorption efficiencies and may be removed magnetically to avoid slow filtration.

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Section: Resultsmentioning

confidence: 99%

Sustainable Low-Concentration Arsenite [As(III)] Removal in Single and Multicomponent Systems Using Hybrid Iron Oxide–Biochar Nanocomposite Adsorbents—A Mechanistic Study

et al. 2020

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“…CaO-based materials were also investigated for CO 2 capture at low to moderate temperatures. ,, Azmi et al compared commercial CaO and a CaO derived from waste seashell cockle for CO 2 adsorption at 2 °C and pressures up to 36 bar. Moisturizing the commercial-grade and synthesized materials to optimum water content of 32% and 67 wt % increased CO 2 uptake ca.…”

Section: Reactive Adsorbentsmentioning

confidence: 99%

Understanding the Effect of Water on CO₂ Adsorption

2021

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Carbon capture from large sources and ambient air is one of the most promising strategies to curb the deleterious effect of greenhouse gases. Among different technologies, CO2 adsorption has drawn widespread attention mostly because of its low energy requirements. Considering that water vapor is a ubiquitous component in air and almost all CO2-rich industrial gas streams, understanding its impact on CO2 adsorption is of critical importance. Owing to the large diversity of adsorbents, water plays many different roles from a severe inhibitor of CO2 adsorption to an excellent promoter. Water may also increase the rate of CO2 capture or have the opposite effect. In the presence of amine-containing adsorbents, water is even necessary for their long-term stability. The current contribution is a comprehensive review of the effects of water whether in the gas feed or as adsorbent moisture on CO2 adsorption. For convenience, we discuss the effect of water vapor on CO2 adsorption over four broadly defined groups of materials separately, namely (i) physical adsorbents, including carbons, zeolites and MOFs, (ii) amine-functionalized adsorbents, and (iii) reactive adsorbents, including metal carbonates and oxides. For each category, the effects of humidity level on CO2 uptake, selectivity, and adsorption kinetics under different operational conditions are discussed. Whenever possible, findings from different sources are compared, paying particular attention to both similarities and inconsistencies. For completeness, the effect of water on membrane CO2 separation is also discussed, albeit briefly.

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“…Recently, biodiesel was considered as one of the most effective alternative energy source. It was renewable and sustainable as well as biodegradable [2]. Moreover, biodiesel production was safe for environment, non-toxicity and discharging of low level of greenhouse gas [3].…”

Section: Introductionmentioning

confidence: 99%

Development of Sr/Cao catalyst derived from cuttlebone (<i>Sepia officinalis</i>) for biodiesel production

Tomano¹,

Prokaew²,

Boonyuen³

et al. 2020

J Met Mater Miner

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Cuttlebone (Sepia officinalis) was used as a source of calcium oxide for biodiesel catalyst. The objective of this work is to present the bio-based catalyst prepared from cuttlebone. 1, 3, 5 and 10 %wt of strontium was loaded into calcium oxide powder derived from cuttlebone. Structural properties of Sr/CaO catalyst were evaluated by Fourier transform infrared and X-ray diffraction, respectively. There is no change on morphological properties of catalyst between Sr/CaO and pristine CaO. The homogeneous distribution of strontium was confirmed by EDX mapping technique. The specific surface area of powder was estimated to be 10-30 m2Â·g-1. The thermal stability of catalyst was stable up to 300Â°C. Preliminary investigation of catalyst for biodiesel was conducted by transesterification from commercial palm olein and methanol. The research work was successfully supported on bio-based economy project.

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Effect of water onto porous CaO for CO2 adsorption: Experimental and extended isotherm model

Cited by 19 publications

References 39 publications

Sustainable Low-Concentration Arsenite [As(III)] Removal in Single and Multicomponent Systems Using Hybrid Iron Oxide–Biochar Nanocomposite Adsorbents—A Mechanistic Study

Sustainable Low-Concentration Arsenite [As(III)] Removal in Single and Multicomponent Systems Using Hybrid Iron Oxide–Biochar Nanocomposite Adsorbents—A Mechanistic Study

Understanding the Effect of Water on CO₂ Adsorption

Development of Sr/Cao catalyst derived from cuttlebone (<i>Sepia officinalis</i>) for biodiesel production

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Effect of water onto porous CaO for CO2 adsorption: Experimental and extended isotherm model

Cited by 19 publications

References 39 publications

Sustainable Low-Concentration Arsenite [As(III)] Removal in Single and Multicomponent Systems Using Hybrid Iron Oxide–Biochar Nanocomposite Adsorbents—A Mechanistic Study

Sustainable Low-Concentration Arsenite [As(III)] Removal in Single and Multicomponent Systems Using Hybrid Iron Oxide–Biochar Nanocomposite Adsorbents—A Mechanistic Study

Understanding the Effect of Water on CO2 Adsorption

Development of Sr/Cao catalyst derived from cuttlebone (<i>Sepia officinalis</i>) for biodiesel production

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Product

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Understanding the Effect of Water on CO₂ Adsorption