Fabrication of zirconium-pillared montmorillonite porous ceramic as adsorbents for Cr 3+ removal and recycling

Ma, Hongwen; Hei, Ya-ni; Li, Hua; Guo, Yingyan; Yang, Yuzhu; Chen, Yu; Qiao, Xianrong

doi:10.1016/j.ceramint.2016.06.130

Cited by 20 publications

(3 citation statements)

References 26 publications

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“…Besides, in the low-2θ-angle region (below 10°) of XRD patterns (Figure S4), the raw MMT showed a basal spacing (d 001 ) of 1.44 nm, while the d 001 value for Zr-MMT increased to 1.67 nm, implying the successful intercalation of Zr 4+ (in the form of Zr 4+ polyhydroxy-cations) into the interlayers of MMT. 67,68 These results of TEM and XRD indicated that the structure of MMT was unchanged by the ion exchange of Zr 4+ , and only the interlayer spacing was enhanced. Moreover, in the XRD pattern of Zr-MMT (Figure S3), no peaks for ZrO 2 were observed, implying that the introduced Zr 4+ did not exist as ZrO 2 but as a new interlayer species (Zr 4+ polyhydroxycations).…”

Section: ■ Results and Discussionmentioning

confidence: 93%

Strong Oxophilicity of Zr Species in Zr⁴⁺-Exchanged Montmorillonite Boosted Meerwein–Ponndorf–Verley Reduction of Renewable Carbonyl Compounds

Song

Xie²,

Xue

et al. 2022

ACS Sustainable Chem. Eng.

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Meerwein−Ponndorf−Verley (MPV) reduction of biomass-derived carbonyl compounds is a greatly promising route for biomass valorization. Robust, facile-prepared, and cost-effective inorganic Zr-based catalysts for this transformation remain highly desirable. Herein, Zr-containing montmorillonite (denoted as Zr-MMT) was constructed by the ion exchange of Zr 4+ with the interlayer cations of montmorillonite (MMT). Very interestingly, as an inorganic catalyst, the prepared Zr-MMT showed high catalytic activity for MPV reduction of various biomass-derived carbonyl compounds. Systematic investigations revealed that the excellent performance of Zr-MMT predominantly originated from more positively charged Zr species ([Zr x (OH) y (H 2 O) n ] (4x−y)+ ), which could boost the activation of the carbonyl group and simultaneously promote the hydrogen transfer process assisted by suitable basic sites on MMT. Notably, the preparation of Zr-MMT avoided the utilization of surfactants or expensive organic ligands, and the prepared Zr-MMT showed better or comparable catalytic performance than most reported Zr-containing catalysts, significantly enabling it to be more practical.

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Section: ■ Results and Discussionmentioning

confidence: 93%

Strong Oxophilicity of Zr Species in Zr⁴⁺-Exchanged Montmorillonite Boosted Meerwein–Ponndorf–Verley Reduction of Renewable Carbonyl Compounds

Song

Xie²,

Xue

et al. 2022

ACS Sustainable Chem. Eng.

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“…For that reason, the research studies have been concentrated on the mitigation of Cr +6 levels through cutback to the lesser venomous Cr +3 . Nevertheless, Cr +3 is effortlessly re-oxidized to the perilous Cr +6 on its exposure to the oxidative environment [ 69 ], and so, the Cr +3 should also be eliminated.…”

Section: Hazardous and Toxic Ions Of Heavy Metals As Pollutants In Industrial Wastewatermentioning

confidence: 99%

A State-of-the-Art Review on Innovative Geopolymer Composites Designed for Water and Wastewater Treatment

Luhar

Abdullah

et al. 2021

Materials

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There is nothing more fundamental than clean potable water for living beings next to air. On the other hand, wastewater management is cropping up as a challenging task day-by-day due to lots of new additions of novel pollutants as well as the development of infrastructures and regulations that could not maintain its pace with the burgeoning escalation of populace and urbanizations. Therefore, momentous approaches must be sought-after to reclaim fresh water from wastewaters in order to address this great societal challenge. One of the routes is to clean wastewater through treatment processes using diverse adsorbents. However, most of them are unsustainable and quite costly e.g. activated carbon adsorbents, etc. Quite recently, innovative, sustainable, durable, affordable, user and eco-benevolent Geopolymer composites have been brought into play to serve the purpose as a pretty novel subject matter since they can be manufactured by a simple process of Geopolymerization at low temperature, lower energy with mitigated carbon footprints and marvellously, exhibit outstanding properties of physical and chemical stability, ion-exchange, dielectric characteristics, etc., with a porous structure and of course lucrative too because of the incorporation of wastes with them, which is in harmony with the goal to transit from linear to circular economy, i.e., “one’s waste is the treasure for another”. For these reasons, nowadays, this ground-breaking inorganic class of amorphous alumina-silicate materials are drawing the attention of the world researchers for designing them as adsorbents for water and wastewater treatment where the chemical nature and structure of the materials have a great impact on their adsorption competence. The aim of the current most recent state-of-the-art and scientometric review is to comprehend and assess thoroughly the advancements in geo-synthesis, properties and applications of geopolymer composites designed for the elimination of hazardous contaminants viz., heavy metal ions, dyes, etc. The adsorption mechanisms and effects of various environmental conditions on adsorption efficiency are also taken into account for review of the importance of Geopolymers as most recent adsorbents to get rid of the death-defying and toxic pollutants from wastewater with a view to obtaining reclaimed potable and sparkling water for reuse offering to trim down the massive crisis of scarcity of water promoting sustainable water and wastewater treatment for greener environments. The appraisal is made on the performance estimation of Geopolymers for water and wastewater treatment along with the three-dimensional printed components are characterized for mechanical, physical and chemical attributes, permeability and Ammonium (NH4+) ion removal competence of Geopolymer composites as alternative adsorbents for sequestration of an assortment of contaminants during wastewater treatment.

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“…Consequently, there are few reports on the removal of Cr(III) from aqueous solution as opposed to Cr(VI) compounds. The few studies were motivated by the fact that Cr(III) can be transformed to Cr(VI) under specific conditions (Lesaoana, Pakade, & Chimuka, 2019; Li et al, 2017; Ma et al, 2016). Chemical precipitation of Cr(III) as Cr(OH) 3 remains one of the commercially viable methods for its removal (Lu, Xu, Yang, Hao, & Cheng, 2017; Mella, Glanert, & Gutterres, 2015).…”

Section: Introductionmentioning

confidence: 99%

A comparative study of acid‐treated, base‐treated, and Fenton‐like reagent‐treated biomass for Cr(VI) sequestration from aqueous solutions

Nchoe

Ntuli

Klink

et al. 2020

Water Environment Research

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A wide variety of biomass materials have been used for the removal of toxic chromium(VI) by biosorption. The current study investigated the efficacy of Macadamia nutshells treated with sodium hydroxide, nitric acid, and the Fenton‐like reagent in the removal of Cr(VI). The adsorbents were characterized by FTIR, SEM, TGA, and elemental analysis. Effects of functional parameters influencing the adsorption of Cr(VI), solution pH (pH 1–11), contact time (5–250 min), concentration of adsorbent (1–10 g/L), and adsorbate concentration (10–200 mg/L) were investigated. The optimum conditions for biosorption were pH 1.4, adsorbent dose of 5 g/L, and 160 min of contact time. In all cases, the base‐treated adsorbent displayed superior performance compared to others, with highest percent removal of 98%. The adsorbate–adsorbent interactions were better explained by the Freundlich isotherm and the pseudo‐first‐order rate model. The Macadamia‐based adsorbents are potentially useful for Cr(VI) removal from aqueous solutions. Practitioner points Three different chemical activators were investigated for the modification of Macadamia surface. The base‐treated material exhibited the highest specific surface area of 12.1 m2/g. The Cr(VI) adsorption performance for the base‐treated material dwarfed the other materials. Excellent Cr(VI) removal efficiency in the presence of competitors was achieved.

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Fabrication of zirconium-pillared montmorillonite porous ceramic as adsorbents for Cr 3+ removal and recycling

Cited by 20 publications

References 26 publications

Strong Oxophilicity of Zr Species in Zr⁴⁺-Exchanged Montmorillonite Boosted Meerwein–Ponndorf–Verley Reduction of Renewable Carbonyl Compounds

Strong Oxophilicity of Zr Species in Zr⁴⁺-Exchanged Montmorillonite Boosted Meerwein–Ponndorf–Verley Reduction of Renewable Carbonyl Compounds

A State-of-the-Art Review on Innovative Geopolymer Composites Designed for Water and Wastewater Treatment

A comparative study of acid‐treated, base‐treated, and Fenton‐like reagent‐treated biomass for Cr(VI) sequestration from aqueous solutions

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Fabrication of zirconium-pillared montmorillonite porous ceramic as adsorbents for Cr 3+ removal and recycling

Cited by 20 publications

References 26 publications

Strong Oxophilicity of Zr Species in Zr4+-Exchanged Montmorillonite Boosted Meerwein–Ponndorf–Verley Reduction of Renewable Carbonyl Compounds

Strong Oxophilicity of Zr Species in Zr4+-Exchanged Montmorillonite Boosted Meerwein–Ponndorf–Verley Reduction of Renewable Carbonyl Compounds

A State-of-the-Art Review on Innovative Geopolymer Composites Designed for Water and Wastewater Treatment

A comparative study of acid‐treated, base‐treated, and Fenton‐like reagent‐treated biomass for Cr(VI) sequestration from aqueous solutions

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Product

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Strong Oxophilicity of Zr Species in Zr⁴⁺-Exchanged Montmorillonite Boosted Meerwein–Ponndorf–Verley Reduction of Renewable Carbonyl Compounds

Strong Oxophilicity of Zr Species in Zr⁴⁺-Exchanged Montmorillonite Boosted Meerwein–Ponndorf–Verley Reduction of Renewable Carbonyl Compounds