Fluoride removal performance of highly porous activated alumina

Yu, Changming; Liu, Lin; Wang, Xiao Dong; Fu, Jiarui; Wu, Yi-nan; Chen, Feng; Wu, Yu; Shen, Jun

doi:10.1007/s10971-022-05722-2

Cited by 11 publications

(4 citation statements)

References 40 publications

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“…Considering the washing and drying effects on porosity, the same raw hindered‐crystallization stage gel materials were deliberately treated by conventional air drying [ 15b ] and SC drying. [ 28 ] The air‐dried xerogel (Figure 1H) contracted and existed in close‐packed forms due to surface tension from solvent evaporation, and consequently, the mesopores were smaller than those in Figure 1F but relatively uniform (≈12 nm, Figure S8, Supporting Information). Meanwhile, with a nearly non‐surface tension SC drying method, the aerogel preserved its interconnected structure like the as‐synthesized condition; therefore, the pore was large, and the distribution was dispersive, ranging from mesopores to macropores region (Figure 1I).…”

Section: Resultsmentioning

confidence: 99%

“…To reinforce the conclusion that the MOF gel was the self‐assembled supramolecular polymer [ 28 ] instead of particles via aggregation, [ 16 ] the gel in the hindered‐crystallization stage was subjected to reported consecutive TEM specimen preparation procedures (Figures S9 and S10, Supporting Information). [ 15d ] Prior to solvent washing, the as‐synthesized gel showed polymer‐like configurations.…”

Section: Resultsmentioning

confidence: 99%

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Sequential Sol‐Gel Self‐Assembly and Nonclassical Gel‐Crystal Transformation of the Metal‐Organic Framework Gel

Schott

et al. 2023

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Metal‐organic framework (MOF) gel, an emerging subtype of MOF structure, is unique in formation and function; however, its evolutionary process remains elusive. Here, the evolution of a model gel‐based MOF, UiO‐66(Zr) gel, is explored by demonstrating its sequential sol‐gel self‐assembly and nonclassical gel‐crystal transformation. The control of the sol‐gel process enables the observation and characterization of structures in each assembly stage (phase‐separation, polycondensation, and hindered‐crystallization) and facilitates the preparation of hierarchical materials with giant mesopores. The gelation mechanism is tentatively attributed to the formation of zirconium oligomers. By further utilizing the pre‐synthesized gel, the nonclassical gel‐crystal transformation is achieved by the modulation in an unconventional manner, which sheds light on crystal intermediates and distinct crystallization motions (“growth and splitting” and “aggregation and fusion”). The overall sol‐gel and gel‐crystal evolutions of UiO‐66(Zr) enrich self‐assembly and crystallization domains, inspire the design of functional structures, and demand more in‐depth research on the intermediates in the future.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Sequential Sol‐Gel Self‐Assembly and Nonclassical Gel‐Crystal Transformation of the Metal‐Organic Framework Gel

Schott

et al. 2023

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“…Adsorption is a common method for the removal of F – . Activated Al 2 O 3 and activated MgO are the most widely used materials due to their good activity, high specific surface area, and excellent adsorption properties. , However, Al 2 O 3 would increase the concentration of aluminum in water, which could be harmful to human health. Activated MgO is an excellent adsorbent with nontoxicity, a large specific surface area, and numerous structural defects.…”

Section: Introductionmentioning

confidence: 99%

Deep Removal of Fluoride by Highly Activated Magnesium Oxide

Cao,

Zhong,

Zhang

et al. 2024

ACS EST Water

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Activated MgO was prepared from calcination of alkaline magnesium carbonate for the removal of a low concentration of fluorion. MgO calcinated at 500 °C showed the highest adsorption capacity and fastest adsorption rate for fluorion. The removal rate of F − reached 98.35% with the maximum adsorption capacity of 19.3 mg•g −1 with an initial F − concentration of 20 mg/L in a wide range of pH. The adsorption of F − by MgO is less affected by Cl − , CO 3 2− , and HCO 3 − . SO 4 2− and NO 3 − have a negative effect on the adsorption of F − on activated MgO. The adsorption process of F − on MgO follows the proposed secondorder kinetic model and Langmuir isotherm model. The adsorption of F − on activated MgO has two stages. Surface and intraparticle diffusion are the rate limiting steps in the first and second stage, respectively. FTIR and XPS results of MgO and used MgO inferred that O−H•••F bonds formed between F − and MgO during the defluorination process.

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“…Activated aluminum (AA), a white, hardened granular substance, formed through the dehydroxylation of aluminum hydroxide, is commonly utilized in water filtration [31][32][33] for the removal of arsenic and fluorine in potable water and may serve as a potential substrate amendment that could increase anionic nutrient retention [34]. Activated aluminum has a high porosity, surface area, and anion affinity, and is relatively inexpensive due to its use in many products across various industries [35][36][37][38]. To date, AA has been utilized in the horticultural industry as a slow-release P fertilizer, and a patented process was developed in which AA is impregnated with P to provide a more controlled release mechanism to support plant growth [39,40].…”

Section: Introductionmentioning

confidence: 99%

Reducing Anion Nutrient Leaching Losses from a Short-Cycle Container-Grown Crop (Tagetes patula) Using Activated Aluminum

et al. 2023

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Short-cycle horticulture crops often rely on fertigation to provide immediately available nutrients. This practice poses an environmental threat when nutrients, particularly phosphorus, leach from containers and enter waterways. One method that could be used to reduce the loss of phosphorus and other key anions from horticultural crops is incorporating activated aluminum into container substrates. This study investigates the incorporation of three rates of activated aluminum into a pine bark substrate, and the effects this amendment may have on the container leachate nutrient content and the growth of a popular short-cycle crop (Tagetes patula, French marigold). The addition of activated aluminum reduced the cumulative mass of phosphorus in container leachate by 69–96% compared to a standard pine bark substrate. The growth index and subjective plant quality scores of Tagetes were equivalent between the activated aluminum-amended substrates and pine bark only substrates, in all cases, producing a salable, quality crop. This study demonstrates that incorporating activated aluminum into container substrates is an effective way to reduce phosphorus loss to the environment without sacrificing crop quality.

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Fluoride removal performance of highly porous activated alumina

Cited by 11 publications

References 40 publications

Sequential Sol‐Gel Self‐Assembly and Nonclassical Gel‐Crystal Transformation of the Metal‐Organic Framework Gel

Sequential Sol‐Gel Self‐Assembly and Nonclassical Gel‐Crystal Transformation of the Metal‐Organic Framework Gel

Deep Removal of Fluoride by Highly Activated Magnesium Oxide

Reducing Anion Nutrient Leaching Losses from a Short-Cycle Container-Grown Crop (Tagetes patula) Using Activated Aluminum

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