Synthesis of merlinoite from Chinese coal fly ashes and its potential utilization as slow release K-fertilizer

Li, Jing; Zhuang, Xinguo; Font, Oriol; Moreno, Natàlia; Vallejo, V. Ramón; Querol, Xavier; Tobías, Aurelio

doi:10.1016/j.jhazmat.2013.11.063

Cited by 69 publications

(43 citation statements)

References 33 publications

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“…Iron was found to be the major fragment of these heated fly ash materials. Similar composition results have been reported on analysis of heavy oil fly ash[6,23]. Acetylene gas was used as a carbon co-precursor along with Ar as a carrier gas.…”

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confidence: 58%

Formation of Carbon Nanotubes from Carbon-Rich Fly Ash: Growth Parameters and Mechanism

Salah

Alghamdi

Memić

et al. 2015

Materials and Manufacturing Processes

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Fly ash is a byproduct, generated due to the use of heavy oil or coal as a fuel in power plants. Recently, carbon rich fly ash is found to have ideal compositions as a catalyst and precursor for carbon nanotubes (CNTs) growth by the chemical vapor deposition method. The existing methods have a limitation on producing CNTs in a large scale. In this work the parameters effecting the growth of CNTs of fly ash were investigate. These include temperature, gas pressure, growth time and gas flow rate. The produced samples were characterized by different techniques. Consistent results is demonstrated in terms of CNTs uniformity, conversion, and lengths as produced under optimized values. The optimum values provide multiwalls CNTs with diameters in the 20-40nm range. Raman spectrum shows G and D bands (the G/D intensity ratio ~ 1.4). The as-grown CNTs displayed peaks of sp 2 and sp 3 carbons in the XPS spectrum with intensity ratio 7.5 eV.Two small bands are also observed at 288.2 and 290.5 eV, which could be assigned to -COO group and π-π* transition carbon. A proposed mechanism for CNTs growth is also presented. The goal of this method is to develop a large scale production of CNTs using fly ash for various applications.

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supporting

confidence: 58%

Formation of Carbon Nanotubes from Carbon-Rich Fly Ash: Growth Parameters and Mechanism

Salah

Alghamdi

Memić

et al. 2015

Materials and Manufacturing Processes

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“…Because the pore size of the zeolite W crystal structures is about 4.8 Å and the hydrated ionic radius of the potassium ion is 3.8 Å, after modification, the zeolite has a large adsorption capacity and a strong selectivity for the potassium ion. Zeolite W has extensive application prospects in the fields of slow‐release potash and seawater etraction . Hence, many studies have been published on the synthesis of zeolite W. For example, the synthesis of K‐W zeo‐lites via hydrothermal alkaline treatment of fly‐ash has been reported .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Zeolite W from Potassic Rocks Activated by KOH Sub‐molten Salt Method

Zhao

Zhang

et al. 2018

Crystal Research and Technology

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Potassic rocks are decomposed to active amorphous material via KOH sub‐molten salt method. Zeolite W is successfully synthesized using amorphous precursor from potassic rocks as raw material. Effects of reaction temperature, reaction time, mass concentration of KOH and mass ratio of KOH‐to‐ore on the decomposition of potassic rocks are investigated. X‐ray powder diffraction (XRD) is used to characterize the precursors and as‐prepared zeolites. The results indicate that the active amorphous precursor is obtained in KOH sub‐molten salt medium with 75% alkali mass concentration and an alkali‐to‐ore mass ratio of 3.5:1 at 200 °C for 7 h. The exchange capacities of modified zeolite W in KCl solution and simulated seawater are 156.8 mgK+/g and 38.39 mgK+/g, respectively. After synthesis of zeolite W, the mother liquor can be recycled.

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“…It has been investigated in wide applications such as membrane for gas separation, catalyst support, fertilizer in agriculture eld, and ion-exchange material. [23][24][25][26][27] However, K-MER has never been reported as an adsorbent to remove Cs + and Sr 2+ cations. Thus, the objective of this work is to synthesize a highly effective K-MER for Cs + and Sr 2+ removal and then to focus on an evaluation of the inuence of coexisting cations (Na + , K + , Ca 2+ , Mg 2+ ) on the Cs + adsorption behavior in water medium.…”

Section: Introductionmentioning

confidence: 99%

Highly effective K-Merlinoite adsorbent for removal of Cs⁺ and Sr²⁺ in aqueous solution

et al. 2017

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Synthesis of merlinoite from Chinese coal fly ashes and its potential utilization as slow release K-fertilizer

Cited by 69 publications

References 33 publications

Formation of Carbon Nanotubes from Carbon-Rich Fly Ash: Growth Parameters and Mechanism

Formation of Carbon Nanotubes from Carbon-Rich Fly Ash: Growth Parameters and Mechanism

Synthesis of Zeolite W from Potassic Rocks Activated by KOH Sub‐molten Salt Method

Highly effective K-Merlinoite adsorbent for removal of Cs⁺ and Sr²⁺ in aqueous solution

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Synthesis of merlinoite from Chinese coal fly ashes and its potential utilization as slow release K-fertilizer

Cited by 69 publications

References 33 publications

Formation of Carbon Nanotubes from Carbon-Rich Fly Ash: Growth Parameters and Mechanism

Formation of Carbon Nanotubes from Carbon-Rich Fly Ash: Growth Parameters and Mechanism

Synthesis of Zeolite W from Potassic Rocks Activated by KOH Sub‐molten Salt Method

Highly effective K-Merlinoite adsorbent for removal of Cs+ and Sr2+ in aqueous solution

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Product

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Highly effective K-Merlinoite adsorbent for removal of Cs⁺ and Sr²⁺ in aqueous solution