Silicate-modified oiltea camellia shell-derived biochar: A novel and cost-effective sorbent for cadmium removal

Cai, Tong; Liu, Xiaoli; Zhang, Jiachao; Tie, Baiqing; Lei, Ming; Wei, Xiangdong; Peng, Ou; Du, Huihui

doi:10.1016/j.jclepro.2020.125390

Cited by 137 publications

(27 citation statements)

References 44 publications

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“…6A, the retention efficiency of Cd(II) by HMB increased from 47.17% to 98.30% with the solution pH enhanced from 2.0 to 8.0, while the removal efficiency reduced from 91.50 to 65.47% with increased adsorption/desorption recycles. Ion exchange with Na + , coordination with π electrons (C=C), surface precipitation (CdSiO 3 , CdCO 3 , or Cd 2 SiO 4 ), and complexation with oxygen groups (O=C-O and Si-O) were the predominant sorption processes of Cd(II) using silicate functionalized oiltea camellia shell biochar (Cai et al 2021). The elimination capacity of MgCl 2 functionalized biochar (MBC) to Cd(II) was 763.12 mg/g, which was 11.15 times greater than the capacity of pristine biochar.…”

Section: Heavy Metal Ionsmentioning

confidence: 99%

Biochar for the removal of contaminants from soil and water: a review

Qiu

Liu

Ling

et al. 2022

Biochar

381

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Biochar shows significant potential to serve as a globally applicable material to remediate water and soil owing to the extensive availability of feedstocks and conducive physio-chemical surface characteristics. This review aims to highlight biochar production technologies, characteristics of biochar, and the latest advancements in immobilizing and eliminating heavy metal ions and organic pollutants in soil and water. Pyrolysis temperature, heat transfer rate, residence time, and type of feedstock are critical influential parameters. Biochar’s efficacy in managing contaminants relies on the pore size distribution, surface groups, and ion-exchange capacity. The molecular composition and physical architecture of biochar may be crucial when practically applied to water and soil. In general, biochar produced at relatively high pyrolysis temperatures can effectively manage organic pollutants via increasing surface area, hydrophobicity and microporosity. Biochar generated at lower temperatures is deemed to be more suitable for removing polar organic and inorganic pollutants through oxygen-containing functional groups, precipitation and electrostatic attraction. This review also presents the existing obstacles and future research direction related to biochar-based materials in immobilizing organic contaminants and heavy metal ions in effluents and soil. Graphical Abstract

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Section: Heavy Metal Ionsmentioning

confidence: 99%

Biochar for the removal of contaminants from soil and water: a review

Qiu

Liu

Ling

et al. 2022

Biochar

381

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“…Therefore, the Cd adsorption on the biochar surface was enhanced, confirmed by the decreases of the relative ratio of silicate from 27.46 to 21.97% after Cd adsorption in Si 2p X-ray photoelectron spectroscopy (XPS) spectra (Figure S10). , …”

Section: Resultsmentioning

confidence: 99%

Copyrolysis of Recycled Plastics and Biomass Reduces Biochar Bioavailable Silicon Production and Cadmium Phytotoxicity

et al. 2022

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Plastic-biomass copyrolysis is often used to recycle solid waste and obtain highly aromatic biochar, which can be used for pollutant adsorption. Bioavailable silicon in derived biochar is of great importance to stabilize and alleviate phytotoxicity of soil heavy metal. However, the exact role of plastic-biomass copyrolysis in biochar bioavailable silicon is not well understood. Copyrolysis of different plastics with silicon-containing biomass (such as rice straw) was carried to investigate transformation of silicon in biochar. It was found that biomass inherent alkaline carbonate (such as K2CO3) reacted with silicon to form K2SiO3, and its dissolution led to a high amount of bioavailable silicon in biochar. In the meantime, copyrolysis of heteroatom-containing plastics (such as polyvinyl chloride and triphenyl phosphate) with biomass inhibited K2SiO3 formation in a dose-dependent manner, which mainly involves the capture of biomass inherent K2CO3 to drive new biochar mineral (KCl and K3PO4) formation. Lack of K2SiO3 formation reduced the bioavailable silicon content of copyrolyzed biochar and simultaneously decreased the Brunauer–Emmett–Teller surface area because of consumption of K2CO3 (porogen). It was also revealed that plastic-biomass copyrolysis reduced Cd stabilization capacity of its derived biochar. Moreover, according to wheat seed germination experiments, copyrolyzed biochar exhibited weak capacity to reduce Cd phytotoxicity. These crucial findings highlight the complex nature of using copyrolyzed biochar.

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“…The methyl group, existing in PDMS, nicely showed up with two prominent bands, at 1258 cm −1 (CH 3 asymmetry bend) and at 1410 cm −1 (CH 3 symmetric bend) (the same chemistry was found according to their infrared spectra). After flame treatment, the prominent peaks at 1327, and 1588 cm −1 were referred to the D peak and G peak of graphene, 37 whereas the signals for methyl group reduced significantly. It can be inferred that partial degradation and carbonization occurred in the flame‐heating process of PDMS.…”

Section: Resultsmentioning

confidence: 99%

Straightforward fabrication of robust and healable superhydrophobic steel mesh based on polydimethylsiloxane

Wang

Xie

Chen

et al. 2022

J of Applied Polymer Sci

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A straightforward and scalable strategy was presented for the fabrication of superhydrophobic stainless steel mesh (SSM) by depositing with polydimethylsiloxane (PDMS) to perform the hydrophobic effect. After the thermal processing with a flame for seconds, the PDMS coated steel mesh demonstrated excellent integration of superhydrophobic/superoleophilic properties. Besides, the resultant SSM showed efficient separation ability of water‐in‐oil emulsion. Furthermore, the surfaces also exhibited excellent tolerance to various chemical, UV irradiated and strongly friction‐resistant against sandpaper (50 g of force for 1000 cm). More strikingly, the damaged surfaces losing its superhydrophobicity can be simply healed by reapplying flame heat to the worn area. This straightforward and healable synthetic strategy for the manufacture of superhydrophobic SSM offers potential applications in large‐scale oil/water separation.

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Silicate-modified oiltea camellia shell-derived biochar: A novel and cost-effective sorbent for cadmium removal

Cited by 137 publications

References 44 publications

Biochar for the removal of contaminants from soil and water: a review

Biochar for the removal of contaminants from soil and water: a review

Copyrolysis of Recycled Plastics and Biomass Reduces Biochar Bioavailable Silicon Production and Cadmium Phytotoxicity

Straightforward fabrication of robust and healable superhydrophobic steel mesh based on polydimethylsiloxane

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