Applications and interfaces of halloysite nanocomposites

Mineralogy and Physico-Chemical Data of Two Newly Discovered Halloysite in China and Their Contrasts with Some Typical Minerals

“…A near zero potential was also detected on the Hal-SY when pH was close to 2.0, considering that this sample contains some dickite, the relatively higher surface potential is reasonable due to the relatively higher cation exchange capacity of this sample. In the pH value of 7.0~10.0, the Zeta potential of all of the samples tend to be in the range −60~−45 mV, especially the samples Hal-LF, Hal-CX, and Hal-TL, which were similar to previous results [6,15]. There is a slight increase at pH = 8, which can be attributed to the interior aluminoxane surface (IEP 9) [48].…”

“…The atomic ratios of SiO 2 to Al 2 O 3 in all of these Hal samples were varied in the range 1.11~1.26, rather than the theoretical 2.0, indicating that the [SiO 4 ] tetrahedral sheet may contain some other positive ions (e.g., Al, Fe, Ti), which have substituted the normal Si sites and yielded some isomorphic or isomeric minerals. The main impurity in halloysite was Fe 3+ (which existed as hematite or maghemite, and even partly substitute positions of Al 3+ in the octahedral sheet [15,43]), Ca 2+ and K + (which often coordinates with oxygen atoms on the edge of the polyhedrons to compensate the excessive electronic charges, these cations may be exchangeable, or existed in the form of carbonates that cannot contribute to the cation exchange). The Hal-AU, Hal-SY and Hal-TL had a trace amount of Ti content, indicative of the anatase (TiO 2 ) impurity [44].…”

“…Based on the hollow nanotubular morphology, large surface area, high porosity, non-toxicity, good thermal stability and biocompatibility, as well as adjustable surface properties of halloysite mineral [13][14][15]. Significant attention has been focused on the application of halloysite into many fields in these years, such as the applications in chemically blocked and controlled release [16][17][18][19][20][21], biomimetic nanoreactors [22][23][24], medicine carrier and biological antibacterial materials [25][26][27], catalysis supports [28][29][30][31][32], hydrogen storage matrix [33][34][35], food packaging applications [36], mineral templates and other functional materials [37][38][39].…”

Hierarchical MoS2 intercalated clay hybrid nanosheets with enhanced catalytic activity

“…To improve the properties of MMT, the pillaring process is often performed, which involves exchanging the interlayer cations with organic or inorganic cations. Various mineral composite materials are used widely in catalysis, energy storage, and wastewater treatment together with supporting minerals such as kaolinite [26][27][28], halloysite [29][30][31][32][33][34], attapulgite [35][36][37], talc [38], expanded perlite [39], and tailings [40][41][42]. MoS 2 and most MoS 2 composites are hydrophobic and cannot be dispersed in water.…”

Thin-walled nanoscrolls by multi-step intercalation from tubular halloysite-10 Å and its rearrangement upon peroxide treatment

“…With the preparation of halloysite nanocomposites/hybrids novel types of materials with desirable properties can be generated. Zn/TiO 2 oxides deposited on the halloysite surface represent anti-microbial properties [5], and can be used as photocatalysts for the removal of organic (and with additional surface treatment NO x ) pollutants [14]. The tubular morphology enables its use as a container for corrosion inhibitors [3,5].…”