Removal of lithium and uranium from seawater using fly ash and slag generated in the CFBC technology

Kalak, Tomasz; Tachibana, Yu

doi:10.1039/d0ra09092a

Cited by 8 publications

(14 citation statements)

References 56 publications

(69 reference statements)

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“…60 [Cl – ] T = 6.1 × 10 –1 M. [U] T = 4.2 × 10 –7 M. [CO 2 (g)] T = 8.9 × 10 –3 M (Fujii, 2017). 72 This calculation result was compatible with those in refs ( 3 ) and ( 4 ).…”

Section: Resultssupporting

confidence: 91%

“…The largest maximum adsorption capacity of U using slag (S) in the latest literature has been reported and its value is 56.7 mg/g of adsorbent. 4 However, it can be easily expected that the amorphous structures of S and FA make it difficult to individually collect U from seawater. It can be considered that H 1.6 Mn 1.6 O 4 with the largest maximum adsorption capacity of Li shows much lower adsorption ability for anionic V and U species in seawater.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the industrial demand for Li is now growing year by year. Basically, the variety of industrial applications leads to an increase in the demand for Li, for instance, Li 2 CO 3 in secondary batteries, glass ceramics, cement, and aluminum, LiOH in grease, CO 2 absorption, mining, and pH adjusters in pressurized water reactors, Li metal in primary batteries, pharmaceuticals, and aluminum alloys, elastomers, another pharmaceutical, and n -butyllithium in agrochemicals, and Li specialties in electric materials and other pharmaceuticals and agrochemicals. − Especially, from the viewpoints of environmental preservation and the reduction of CO 2 emissions in recent years, it has been imperative to introduce zero-emission vehicles, including electric automobiles and portable electric devices equipped with reusable batteries. According to the latest literature, the proportion of the total consumption of Li used for Li secondary batteries was ca.…”

Section: Introductionmentioning

confidence: 99%

“…As with U recovery from seawater, many researchers have attempted to collect economically U in seawater using the following various types of adsorbents: (1) inorganic materials (inorganic adsorbents (IAs) [adsorption capacity (AC)/(mg of U/g of adsorbent) = 6 × 10 –3 to 8.50 × 10 2 (in water), = 7 × 10 –3 (in seawater)], , nanostructured carbons (NCs) [AC = 6 × 10 –3 to 1.932 × 10 3 (in water), = 2 × 10 –3 to 3.4 (in seawater)], − and mesoporous silica adsorbents [AC = 8 × 10 –3 to 2.77 × 10 2 (in water), = 3 × 10 –2 to 1 × 10 –1 (in seawater) − ]; (2) organic materials (radiation-induced graft polymerization-prepared adsorbents (RIGPAs) [AC = 3 × 10 –3 to 9.24 × 10 2 (in water), = 6 × 10 –4 to 5 (in seawater)] − and atom-transfer radical polymerization-prepared adsorbents (ATRPAs) [AC = 2 –1.79 × 10 2 (in water), = 6 × 10 –1 to 5.2 (in seawater)], − polymer adsorbents prepared by neither RIGPs nor ATRPs (PAs) [AC = 1.7 × 10 –2 to 5.50 × 10 2 (in water), = 4.2 × 10 –3 to 2.81 × 10 1 (in seawater) − ]; (3) inorganic–organic hybrid materials (metal–organic frameworks (MOFs) [AC = 0 to 8.40 × 10 2 (in water)], , covalent organic frameworks (COFs) [AC = 5.0 × 10 1 to 2.11 × 10 2 (in water)], , and porous-organic polymers (POPs) [AC = 4.0 × 10 1 to 3.04 × 10 2 (in water), = 2 (in seawater) , ]; (4) biomaterials [proteins engineered genetically for high affinity and their connected materials (BMs)] [AC = 1 (mg-U/g-adsorbent) and 100 (pmol/bead) (in water), = 9.2 × 10 –3 (in seawater) , ]; and (5) waste materials [fly ash (FA): AC = 2.13 × 10 1 , slag (S): AC = 5.67 × 10 1 (in seawater)] . These summarized data imply that all adsorption reactions between U and their adsorbents are significantly blocked by other substances in seawater.…”

Section: Introductionmentioning

confidence: 99%

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Chromatographic Purification of Lithium, Vanadium, and Uranium from Seawater Using Organic Composite Adsorbents Composed of Benzo-18-Crown-6 and Benzo-15-Crown-5 Embedded in Highly Porous Silica Beads

2022

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The use of the composite adsorbents composed of benzo-15-crown-5 (abbreviated as BC15) and benzo-18-crown-6 (BC18) for the simultaneous recovery of vanadium (V), uranium (U), and lithium (Li) from seawater has been proposed for industrial applications. The adsorption and desorption behavior of these elements on BC15 and BC18 has been examined in various types of aqueous solutions over a wide temperature range. As a result, it was shown that BC15 and BC18 have sufficient adsorption ability for the simultaneous recovery of V, U, and Li from seawater. Moreover, it was seen that the distribution coefficients ( K d ) of V decrease with an increase in [HCl] T (subscript T: total concentration), indicating that the anionic V species such as H 2 V 4 O 13 4– are exponentially changed into the cationic V species such as V 3+ , VO 2+ , and VO 2 + under the condition [HCl] T = 1.0 M, and the complexation reactions between BC15 (or BC18) and the initial V structures are inhibited. Besides, it was reasonably shown that the adsorption mechanism is the path through the electrostatic interaction between the anionic V species such as H 2 V 4 O 13 4– , and the −C–O–C– single bond that the electron density is eccentrically located in ether functional groups in crown ether rings in BC15 and BC18 (or the −C–OH single bond that the electron density is eccentrically located in bisphenol A in BC15 and BC18). Then, the chromatography experiment of V, U, and Li on BC15 (or BC18) at 298 K was carried out by flowing seawater, 1.0 × 10 –2 M HCl, and 1.0 M HCl in sequence. The first peak of V can be separated from the plateau of Li and the first and second peaks of U in the case of the BC15 system. The recovery ratios of V and U were more than 80%. On the other hand, entirely overlapping chromatograms were obtained in the case of the BC18 system, and accordingly, the recovery ratios of V and U were much lower. In short, the separation efficiency of V with BC15 is more pre-eminent than that with BC18. Judging from these results, the durability of BC15 was finally assessed for industrial applications, that is, the aforementioned chromatography experiment was repeatedly carried out to check whether V, U, and Li were stably and mutually separated from seawater or not. The evidence that the recovery performances of V, U, and Li from seawater do not decrease at all after at least five cycle tests was provided. This indicates that this information will be valuable for the development of a practical chromatographic technology to simultaneously recover V, U, and Li from seawater.

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“…60 [Cl – ] T = 6.1 × 10 –1 M. [U] T = 4.2 × 10 –7 M. [CO 2 (g)] T = 8.9 × 10 –3 M (Fujii, 2017). 72 This calculation result was compatible with those in refs ( 3 ) and ( 4 ).…”

Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Chromatographic Purification of Lithium, Vanadium, and Uranium from Seawater Using Organic Composite Adsorbents Composed of Benzo-18-Crown-6 and Benzo-15-Crown-5 Embedded in Highly Porous Silica Beads

2022

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“…The MSW is disposed of on the same day through closed collection and transportation. In urban areas, waste is collected by community's resident committees, property management companies, and waste cleaning companies, and then transferred to a local storage center [27]. Incineration is a primary treatment for hazardous waste and industrial waste in China.…”

Section: Current Situation Of Mswm In Chinamentioning

confidence: 99%

Transformation of Solid Waste Management in China: Moving towards Sustainability through Digitalization-Based Circular Economy

et al. 2022

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In China, environmental pollution due to municipal solid waste (MSW) over-generation is one of the country’s priority concerns. The increasing volume and complexity of the waste poses serious risks to the environment and public health. Currently, the annual growth of MSW generation is estimated to be approximately 8–10% and will increase to 323 million metric tons (Mt) by 2030. Based on the secondary data collected from a literature survey, this article critically evaluates the recent progress of MSW management (MSWM) in China and offers new insights into the waste sector in the era of Industry 4.0. This helps decision makers in China to plan a smooth transition nationwide to a circular economy (CE) in the waste sector. It is evident that digitalization is a driving force for China to move towards low-carbon development strategies within the framework of CE. Through digitalization, the waste sector has promoted prevention, reduction, reuse, and recycling (3Rs) of waste before waste disposal in landfills. A proper implementation of digitalization-based waste recycling has contributed to an efficient cooperation between the government and private sector, increased job opportunities, and promoted the conservation of resources. It is anticipated that this work not only contributes to the establishment of an integrated MSWM system in China, but also improves local MSWM through digitalization in the framework of a CE.

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Preparation of nitrogen-enriched pine sawdust-based activated carbons and their application for copper removal from the aquatic environment

et al. 2022

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In this research study, compressed pellets of pine wood sawdust were carbonized at a temperature of 600 °C and then physically activated at 800 °C to obtain activated carbons (ACs). Then, some of the samples were enriched with nitrogen by reaction with urea at 300 °C. The AC samples prepared in this way were examined for the removal of Cu(II) in adsorption processes. Pine wood sawdust is waste resulting from processing in the wood industry and is a promising material to be reused for metal ions recovery. For this purpose, firstly, the AC was characterized using several analytical methods, including ash content, elemental composition, TGA, specific surface area and pore diameter (BET), pore size distribution (BJH), micropore volume, the content of surface acidic and basic functional groups, pH, FTIR and SEM morphology. Secondly, these materials before and after modification with nitrogen were used in experiments on the adsorptive removal of Cu(II) ions from aqueous solutions. The influence of parameters, such as initial pH, adsorbent dosage, initial Cu(II) concentration and contact time on the process, was investigated. Thirdly, adsorption kinetics and sorption isotherms were analyzed. According to the research results, it was reported that maximum sorption efficiency was equal to 99.9 and 99.8% at pH 5 for activated carbon AC (TK6AF1/2) and nitrogen-modified activated carbon NMAC (TK6MAF1/2), respectively. This proves that the examined waste materials exhibit satisfactory sorption properties in relation to Cu(II) ions and can be used as low-cost adsorbents in industrial wastewater treatment processes. These studies are in line with current global trends in sustainable and circular economy. Future research may focus on performing adsorption processes of copper and other metals at various temperatures as well as dynamic flow, studying metal ion competition, performing regeneration to reuse the adsorbents, carrying out realistic wastewater studies and cost estimation of entire processes on a laboratory and industrial scale.

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Removal of lithium and uranium from seawater using fly ash and slag generated in the CFBC technology

Abstract: Fly ash and slag were produced as a result of the incineration of municipal sewage sludge using the circulating fluidized bed combustion (CFBC) technology and were examined for the simultaneous recovery of lithium and uranium from seawater in batch adsorption experiments.

Cited by 8 publications

References 56 publications

Chromatographic Purification of Lithium, Vanadium, and Uranium from Seawater Using Organic Composite Adsorbents Composed of Benzo-18-Crown-6 and Benzo-15-Crown-5 Embedded in Highly Porous Silica Beads

Chromatographic Purification of Lithium, Vanadium, and Uranium from Seawater Using Organic Composite Adsorbents Composed of Benzo-18-Crown-6 and Benzo-15-Crown-5 Embedded in Highly Porous Silica Beads

Transformation of Solid Waste Management in China: Moving towards Sustainability through Digitalization-Based Circular Economy

Preparation of nitrogen-enriched pine sawdust-based activated carbons and their application for copper removal from the aquatic environment

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