Bentonite-hydrochar composite for removal of ammonium from Koi fish tank

Ismadji, Suryadi; Tong, Dong Shen; Soetaredjo, Felycia Edi; Ayucitra, Aning; Yu, Wei; Zhou, Chun Hui

doi:10.1016/j.clay.2015.06.025

Cited by 28 publications

(25 citation statements)

References 30 publications

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“…A bentonite-biochar composite produced from cassava peel and activated with CO 2 at the final pyrolysis stage, presented ~150% greater sorption capacity for NH 4 + than an unmodified biochar (Ismadji et al, 2016). This increase is ascribed to enhanced physical adsorption of…”

Section: -mentioning

confidence: 97%

Biochar modification to enhance sorption of inorganics from water

Sizmur

Fresno

Akgül

et al. 2017

Bioresource Technology

580

163

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Biochar can be used as a sorbent to remove inorganic pollutants from water but the efficiency of sorption can be improved by activation or modification. This review evaluates various methods to increase the sorption efficiency of biochar including activation with steam, acids and bases and the production of biochar-based composites with metal oxides, carbonaceous materials, clays, organic compounds, and biofilms. We describe the approaches, and explain how each modification alters the sorption capacity. Physical and chemical activation enhances the surface area or functionality of biochar, whereas modification to produce biochar-based composites uses the biochar as a scaffold to embed new materials to create surfaces with novel surface properties upon which inorganic pollutants can sorb. Many of these approaches enhance the retention of a wide range of inorganic pollutants in waters, but here we provide a comparative assessment for Cd, Cu, Hg, Pb, Zn, NH, NO, PO, CrO and AsO.

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Section: -mentioning

confidence: 97%

Biochar modification to enhance sorption of inorganics from water

Sizmur

Fresno

Akgül

et al. 2017

Bioresource Technology

580

163

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“…The clay minerals lose a significant part of the adsorption capacity after regeneration. Recently, several approaches for bentonite modification were studied, e.g., incorporation of chitosan [14], calcium alginate [15], activated carbon [16], hydrochar [17], polymerized 4-vinylpyridine [18], magnesite [19], and polyaniline [20] into the bentonite networks to enhance the sorption properties.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Synthesis Method on the Structural Characteristics of Novel Hybrid Adsorbents Based on Bentonite

Sternik

Galaburda

Bogatyrov

et al. 2019

Colloids and Interfaces

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New hybrid composite materials were prepared by polymerization of resorcinolformaldehyde resins in the presence of bentonite with various contents of polymer and water, and then exposed to pyrolysis in an inert atmosphere at 800 • C. The influence of the filler and synthesis method on the morphological, textural and structural characteristics has been described. The materials were characterized using low temperature nitrogen adsorption-desorption, small angle X-ray scattering, scanning electron microscopy, Raman spectroscopy, differential scanning calorimetry (DSC), and thermogravimetry analysis (TGA). The maximal values of the specific surface area of organo-bentonite and carbonized samples were 254 and 200 m 2 /g, respectively, which is much larger than that of the initial bentonite. The TGA and DSC experiments showed changes in the thermal stability of samples depending on their composition. The obtained data could provide a better understanding of the principles of preparing hybrid bentonite-containing composites that may provide an additional incentive to develop advanced technologies.

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“…Bentonite is one kind of clay material which has 2:1 layer structure in which the octahedral sheet is sandwiched between two tetrahedral silica sheets, with water and metal cations existing between the spaces of the layers [5]. The layers are negatively charged and held together by charge-balancing counterions like Ca 2þ and Na þ .…”

Section: Introductionmentioning

confidence: 99%

“…The combination of clay and other materials such as metal oxides and polymers has gained much attention from researchers in recent years. These clay based composite materials have excellent capability for removing various organic and inorganic contaminants [5,7].…”

Section: Introductionmentioning

confidence: 99%