Synthesis of Zeolite 4A from Kaolin and Its Adsorption Equilibrium of Carbon Dioxide

Wang, Peng; Sun, Qi; Zhang, Yujiao; Cao, Jun

doi:10.3390/ma12091536

Cited by 40 publications

(27 citation statements)

References 26 publications

(36 reference statements)

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“…Hysteresis loop for this zeolite is classified as H3.The abrupt closure of the hysteresis loop at a relative pressure P/P° of 0.45 is due to the breakage of the liquid nitrogen meniscus at this relative pressure followed by emptying of the pores. Similar results were reported for zeolite A obtained from fly ash (Volli and Purkait, 2015) and from kaolin (Wang et al, 2019). The external area surface was 7.7 m 2 /g and the surface calculated by the use of the BET equation was 19.7 m 2 /g; the difference between these values gives a relatively high micropore area of 12 m 2 /g.…”

Section: Resultssupporting

confidence: 82%

“…The medium strong band at 560 cm -1 corresponds to the vibrations of the secondary building units (double 4-rings) (Flanigen et al, 1974). Similar values of FTIR bands are reported for both commercial zeolite 4A and zeolite synthesized from kaolin (Wang et al, 2019) a b Fig. 6, FTIR spectrum of zeolite A obtained from AlW at the pilot-scale…”

Section: Resultssupporting

confidence: 75%

“…According to the XRD, SEM and FTIR studies, the as-obtained zeolite exhibits crystalline, structural and morphological characteristics similar to those of zeolites prepared from both commercial reagents (Hashemian et al, 2013;Kugbe et al, 2009;Radulović et al, 2013) and other types of wastes (Anuwattana and Khummongkol, 2009;Ayele et al, 2015Ayele et al, , 2016Chareonpanich et al, 2011;Wang et al, 2019).…”

Section: Resultsmentioning

confidence: 66%

See 2 more Smart Citations

Zero-waste process for the transformation of a hazardous aluminum waste into a raw material to obtain zeolites

López‐Delgado¹,

Robla²,

Padilla³

et al. 2020

Journal of Cleaner Production

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A potential route to minimize the environmental impact of industrial activities is, among other approaches, the use of hazardous wastes as less-common raw materials for the preparation of other materials. Realistic technologies for waste management should include simple and lowcost processes as well as the nonproduction of new wastes. Thus, the total conversion of a type of hazardous aluminum waste into zeolite was achieved at the pilot-scale (200 l autoclave reactor) under mild hydrothermal operating conditions. In a one-step process, 3.2 tons of zeolite, 76.4 Nm 3 of ammonia and 105.9 Nm 3 of hydrogen can be produced per ton of aluminum waste. The process does not generate other wastes. The recycling of process effluents (mother liquor and rinse water), along with the process gases capture and its subsequent commercialization, would increase the environmental impact and the economic yield. The obtained Linde type-A zeolite, exhibited structural, textural and morphological characteristics similar to those of zeolites prepared from commercial reagents. A conceptual design for zero-waste process is proposed. The sustainable process developed can contribute to reduce the high environmental impact of aluminum industry waste, and contribute to the circular economy by converting a hazardous waste into a raw material.

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Section: Resultssupporting

confidence: 82%

Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 66%

See 1 more Smart Citation

Zero-waste process for the transformation of a hazardous aluminum waste into a raw material to obtain zeolites

López‐Delgado¹,

Robla²,

Padilla³

et al. 2020

Journal of Cleaner Production

View full text Add to dashboard Cite

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“…Zeolites are effective for purifying water and gases [51][52][53]. There are numerous works on their production using coal ash [54][55][56][57][58].…”

Section: Adsorption By Zeolites Synthesized From Rice Husksmentioning

confidence: 99%

Remediation of Potential Toxic Elements from Wastes and Soils: Analysis and Energy Prospects

et al. 2019

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The aim of this study is to evaluate the application of the main hazardous waste management techniques in mining operations and in dumping sites being conscious of the inter-linkages and inter-compartment of the contaminated soils and sediments. For this purpose, a systematic review of the literature on the reduction or elimination of different potential toxic elements was carried out, focusing on As, Cd and Hg as main current contaminant agents. Selected techniques are feasible according to several European countries’ directives, especially in Spain. In the case of arsenic, we verified that there exists a main line that is based on the use of iron minerals and its derivatives. It is important to determine its speciation since As (III) is more toxic and mobile than As (V). For cadmium (II), we observed a certain predominance of the use of biotic techniques, compared to a variety of others. Finally, in mercury case, treatments include a phytoremediation technique using Limnocharis flava and the use of a new natural adsorbent: a modified nanobiocomposite hydrogel. The use of biological treatments is increasingly being studied because they are environmentally friendly, efficient and highly viable in both process and energy terms. The study of techniques for the removal of potential toxic elements should be performed with a focus on the simultaneous removal of several metals, since in nature they do not appear in isolation. Moreover, we found that energy analysis constitutes a limiting factor in relation to the feasibility of these techniques.

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“…These two stages (adsorption and regeneration) are composed of four steps: adsorption, depressurization, purge, and repressurization. The process operates cyclically; when one column adsorbs, the other is regenerated, and then the stages are reversed [12,14,20,21,[25][26][27][28]. The mathematical model of the PSA process is described by Partial Differential Equations (PDE), and, to solve these equations, initial and boundary conditions are necessary.…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Separation of the H2O/H2SO4 and H2O/C2H5OH Mixtures: A Simulated and Experimental Study

et al. 2020

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Adsorption processes are characterized by their kinetics and equilibrium isotherms described by mathematical models. Nowadays, adsorption with molecular sieves is a method used to separate certain elements or molecules from a mixture and produce hydrogen, nitrogen, oxygen, ethanol, or water treatment. This study had two main objectives. The first one was focused on the use of different natural (Clinoptilolite-S.L. Potosi, Clinoptilolite-Puebla, and Heulandite-Sonora) and synthetic (Zeolite Type 3A) adsorbents to separate the mixtures H 2 O/H 2 SO 4 and H 2 O/C 2 H 5 OH. It was determined that both Zeolite Type-3A and Heulandite-Sonora have greater adsorption capacity in a shorter time compared with the Clinoptilolites at different temperatures. The second objective was the simulation of a pressure swing adsorption process to dehydrate ethanol using the parameters obtained from Zeolite Type 3A (with maximum adsorption capacity). Several configurations were considered to calculate the appropriate nominal values for the optimal process. The results illustrate that the purity of ethanol is increased when the following parameters are considered in the adsorption process: a high pressure, a constant temperature between 100 and 120 • C, a feed composition near the azeotropic point with lower water content, and a purge pressure near the vacuum. Finally, the results show that it is possible to take advantage of the length of the absorber bed in order to reduce the energy costs by increasing the ethanol production as well as complying with the international purity standards.

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Synthesis of Zeolite 4A from Kaolin and Its Adsorption Equilibrium of Carbon Dioxide

Cited by 40 publications

References 26 publications

Zero-waste process for the transformation of a hazardous aluminum waste into a raw material to obtain zeolites

Zero-waste process for the transformation of a hazardous aluminum waste into a raw material to obtain zeolites

Remediation of Potential Toxic Elements from Wastes and Soils: Analysis and Energy Prospects

Adsorption and Separation of the H2O/H2SO4 and H2O/C2H5OH Mixtures: A Simulated and Experimental Study

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