Quan Wan

• PhD
• CAS

The interaction between aluminum (hydr)oxides and inorganic substances has received widespread attention in the fields of ore deposit geochemistry, mineral processing, and environmental protection [...]

This research delved into the influence of mesoporous silica’s surface charge density on the adsorption of Cu²⁺. The synthesis of mesoporous silica employed the hydrothermal method, with pore size controlled by varying the length of trimethylammonium bromide (CnTAB, n = 12, 14, 16) chains. Gas adsorption techniques and transmission electron microsc...

The widespread utilization of plastic products ineluctably leads to the ubiquity of nanoplastics (NPs), causing potential risks for aquatic environments. Interactions of NPs with mineral surfaces may affect NPs transport, fate and ecotoxicity. This study aims to investigate systematically the deposition and aggregation behaviors of carboxylated pol...

The direct discharge of rare earth wastewater causes the waste of resources and heavy metal pollution. This paper compared the adsorption behaviors of lanthanide ions on bentonite under sulfate and nitrate systems by examining the factors affecting the adsorption, such as adsorption time, pH, background electrolyte concentration, and initial rare e...

This research delved into the influence of mesoporous silica's surface charge density on the adsorption of Cu ²⁺ . The synthesis of mesoporous silica employed the hydrothermal method, with pore size controlled by varying the length of trimethylammonium bromide (C n TAB, n = 12,14,16) chains. Gas adsorption techniques and transmission electron micro...

Many surface processes of clay minerals require in-depth understanding of their surface electrical properties, such as surface charge density, surface potential distribution, etc. In this paper, electrostatic force microscopy (EFM) and Kelvin probe force microscopy (KPFM) were used to study the surface charge densities, surface potentials, electric...

The enrichment process of rare earth elements in ion-adsorbed rare earth ores and bauxite is potentially related to the adsorption of rare earth elements by gibbsite. In this paper, lanthanum and yttrium were selected as surrogates of light rare earth elements and heavy rare earth elements, respectively. The effects of adsorption time, solution pH,...

The ubiquitous nanoplastics (NPs) in the environment are emerging contaminants due to their risks to human health and ecosystems. The interaction between NPs and minerals determines the environmental and ecological risks of NPs. In this study, the deposition behaviors of carboxyl modified polystyrene nanoplastics (COOH-PSNPs) with goethite (α-FeOOH...

Adsorption of nanoparticles on minerals affects the fate and transport of nanoparticles directly and is of great significance to many fields, including research into ore deposits, geochemistry, the environment and mineral materials. Whereas many previous studies have been conducted under the equilibrium pH and low solid (mineral) to liquid (nanopar...

Organic matter (OM) in shales occurs as nanometer-sized intercalations with clay minerals that are termed as clay-organic nanocomposites; however, the OM occurrence in nanocomposites at different stages of maturation is still unclear, and the co-evolution process of OM and clay under burial is not well understood. To reveal the variation of OM occu...

The coexistence of heavy metals and organics in industrial wastewater is prevalent, and the removal of these toxic pollutants concurrently is of one of the greatest concerns facing wastewater treatment. In this study, a series of Al-incorporated magadiite (AlMagx, x represents nominal Si/Al ratio) were synthesized hydrothermally and investigated fo...

Enrichment of As and Au at the overgrowth rims of arsenian pyrite is a distinctive feature of Carlin-type gold ores. Revealing distribution of such key elements in high resolution is of fundamental importance yet often proves challenging. In this study, repeated non-oxidative acid etching of ore samples from Shuiyindong gold deposit was applied to...

Nanoplastics (NPs) are emerging contaminants in the environment, where the transport and fate of NPs would be greatly affected by interactions between NPs and minerals. In the present study, the interactions of two types of polystyrene nanoplastics (PSNPs), i.e., bare-PSNPs and carboxylated PSNPs-COOH, with iron (hydr)oxides (hematite, goethite, ma...

The elimination of iodide (I-) from water is a tough subject due to its low adsorption tendency and high mobility. In this work, MCM-41/Ag2O nanomaterials were prepared, characterized, and employed to adsorb I- from water. The Ag2O nanoparticles were dispersed homogeneously in the pores or at the surface of the MCM-41 support, and the Ag2O nanopart...

Halloysite/Ag2O (Hal/Ag2O) nanomaterials were prepared by growing Ag2O nanoparticles on the surface of nanotubular halloysite using silver nitrate solution under alkaline conditions. The nanomaterials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and N2 adsorption. Good dispersion of Ag2O nanoparticles with...

The pyrolytic behavior of organic matter inside nanopores was studied by simultaneous thermogravimetric/differential scanning calorimetry analyzer coupled with Fourier transform infrared spectroscopy (STA/TG-FTIR). Nanoporous silica was prepared by a hydrothermal method using long-chain alkyl quaternary ammonium bromide (C n TAB, n = 12, 14) as a t...

The efficient removal of iodide (I⁻) from water is challenging to accomplish because of the large size and low charge of I⁻. In this study, halloysite/Ag2O composites were prepared, characterized, and used to remove I⁻ from water. The Ag2O nanoparticles primarily resided in the lumen of halloysite in the composites, whose amount and size can be rea...

Pyrite nanomaterials show an excellent performance in remediating Cr(VI) contaminated wastewater. However, the high surface reactivity makes them easy to agglomerate to reduce their removal efficiency for Cr(VI). In this study, a novel hexapod-like pyrite nanosheet clusters material was successfully synthesized via a facile hydrothermal method with...

Low-pressure N 2 adsorption (LPNA) could provide quantitative data for characterizing the pores in gas shale. However, the inconsistencies of outgas temperature have caused significant deviations in LPNA experiments. To explore the effects of outgas temperature on pore characteristics, two shale samples of Lower Cambrian Niutitang formation from No...

Herein, a novel hexapod-like pyrite nanosheets mineral cluster was prepared via a facile hydrothermal method. Compared with classical homogeneous Fenton processes, this catalyst possessed a higher adsorption capacity and catalytic activity to ciprofloxacin (20 mg/L), which could be completely degraded within 10 min at pH 4.0. •OH was the main react...

While engineered nanoparticles are widely used and maybe eventually released into the environment, natural nanoparticles are also commonly found in the Earth system. Nanoparticles may critically affect the geochemical migration of associated elements and pose potential threats to the ecological environment. It is necessary to establish an accurate...

Dear Colleagues, Nanotubular and nanofibrous clay minerals, such as halloysite, chrysotile, palygorskite, sepiolite, etc., have been attracting more and more research attention, because of their unique one-dimensional structure, easily regulated properties and diverse applications. This Special Issue entitled "Nanotubular and nanofibrous clay mine...

The organic carbon in shale has been proved to be a significant hydrocarbon source in two occurrences of discrete OM and organic-clay composites. Although the evolution of OM-hosted pores has been investigated by extensive research, the evolution of nanopores in discrete OM and organic-clay composites under additional stress is still unclear. In th...

The occurrences of gold as lattice-bound ionic Au ⁺ and nanoparticulate Au ⁰ inclusions, collectively termed “invisible gold” in pyrite have long been recognized as a most important characteristic of Carlin-type gold...

Nanoscience and nanotechnology study the properties of materials within the range 0 [...]

Sorption between nanoparticles (NPs) and minerals may critically affect the migration of associated elements as well as the environmental impact of NPs. Since illite is widely present in soil, sediment, and water, we have experimentally investigated the sorption behavior of citrate-coated gold nanoparticles (AuNPs) as model NPs on illite under diff...

Naturally occurring porous minerals as adsorbents for the remediation of environmental pollution has been one of the hot topics in environmental science and material science. In this study, the adsorption of iodate (IO3⁻) on two nanosized tubular halloysite samples (HBHal and SCHal, from Hubei and Sichuan Province, China, respectively) were investi...

Immobilization of iodide (I⁻) from groundwater and soils is a challenging subject due to the large size and low charge of I⁻. Clay minerals and (hydr)oxides generally exhibit very low adsorption capacity due to anion exclusion or weak attraction. For the first time, the adsorption of I⁻ by chrysotile bundles (Chry-B) was investigated and a characte...

Adsorption by nanoporous media is critically involved in many fundamental geological and geochemical processes including chemical weathering, element migration and enrichment, environmental pollution, etc. Yet, the adsorption behavior of metal ions on nanoporous materials has not been systematically investigated. In this study, MCM-41 material with...

Nanocubic pyrite (FeS2) crystals with exposed (100) crystal faces and sizes of 100–200 nm were successfully synthesized via a facile hydrothermal method using greigite (Fe3S4) as the iron precursor and thiourea (NH2CSNH2) as the sulfur source. When the concentration of thiourea was 40 mmol/L, both pyrite and hematite were observed in the as-prepare...

As the two important components of shale, organic matter (OM) and clay minerals are usually thought to strongly influence the hydrocarbon generation, enrichment and exploitation. The evolution process of OM and clay minerals as well as their interrelationship over a wide range of thermal maturities are not completely clear. Taking Yanchang (T3y), L...

Substantial knowledge gap still exists in understanding Stöber silica’s confusing microporosity. In this work, we utilized simultaneous thermal analysis coupled with Fourier transform infrared spectroscopy to characterize Stöber silica samples prepared with various post-treatments including water or ethanol washing and drying at different temperatu...

Sorption of nanoparticles on mineral surfaces has been well recognized for its environmental implication. For certain gold ore deposits, sorption of gold nanoparticles (AuNPs) on pyrite may constitute a critical step in the metallogenesis process, yet it has not been adequately investigated. In this work, we synthesized negatively charged, positive...

In organic-rich gas shales, clay minerals and organic matter (OM) have significant influences on the origin, preservation, and production of shale gas. Because of the substantial role of nanoscale pores in the generation, storage, and seepage of shale gas, we examined the effects of clay minerals and OM on nanoscale pore distribution characteristic...

Nanogeology is a subject that is a combination of geology and nanoscale science, and it has been a frontier field in recent years. It is also a new subject with the features of intersectionality and multidisciplinary. Digging deeper into geological problems and nanoscale phenomena helps better revealing the more essential mechanisms and processes i...

Nanogeoscience is a highly comprehensive and overlapping subject, with combination of nanotechnology and geoscience. It is hard to partition nanogeoscience into single discipline of the classical sense. Its research objects mainly include nanomaterials and nanopores, which are widely distributed on the earth and have diverse causes and obvious scal...

Nano-micron-sized spheroidal aggregates of FeS2 has been found from the Laozuoshan gold deposit, Heilongjiang Province, NE China. There are diversified morphology, some as large or small girdles, and some as paragenesis of aggregates through cementation. Most of such aggregates distribute at the edge of pyrrhotite before metasomatized by arsenopyri...

Montmorillonite, a kind of nano-mineral, is potentially useful for a cigarette additive because of its catalytic capability and non-toxicity. In this research, we used thermogravimetric analysis combined with Fourier transform infrared spectroscopy spectrometry (TGA-FTIR) to study the effect of montmorillonite content to the pyrolysis and combustio...

Nanoscale pore characteristics are crucial in assessing the resource potential of gas shales. Although the Niutitang formation was widely deposited in the upper Yantze Platform, South China and has been recognized as a promising shale gas reservoir, there lacks substantial breakthrough in the exploitation of shale gas from the Niutitang formation....

Titanium pillared montmorillonite was prepared by the sol-gel method with the precursor of isopropyl titanate. Subsequently, the Ti-pillared montmorillonite was modified by γ-Aminopropyltriethoxysilane (APTES) in three solvents with different polarities. Combining with X-ray diffraction pattern, Fourier transform infrared spectroscopy, thermal anal...

The sorption of gold nanopartilces (AuNPs) with diameters of 16 or 39 nm on the surface of pyrite (80-100 or 140-160 mesh) was experimentally studied by systematically evaluating the effects of atmosphere, pH, reaction time and particle sizes on the sorption behavior. We have found that oxidation of pyrite plays a critical role in the sorption proc...

Nanogeosciences are the international frontier field for the recent cross-development of geosciences and nanotechnology, also are the combination of nanometer and earth. It is possible to research the morphology, structures, and components of the earth on a nanoscale and further reveal the nanoscale information recorded by the substances on the ear...

Puzzling aspects of the microporous structure of Stöber silica, including inconsistencies in the BET specific surface area and the long measurement time required for N2 adsorption, hinder further research on and potential applications of this material. In this work, Stöber silica samples prepared using systematic and detailed post-treatment methods...

Nanoscience and technology is the science of studying substance characteristics with the grain size ranging from 0. I nm to 100 nm. Nano-particles are at the nano scale, which possess surface and interface effect, small size effect, macroscopic quantum tunneling and quantum size effect and other special physical and chemical properties. Nano scienc...

Nanogeochemistry is an interdisciplinary field evolving from combination of nanotechnology and geochemistry. It studies formation and special properties of the ubiquitous naturally-occurring nanomaterials as well as their impacts on geo- chemical processes. This paper briefly reviews the origin and recent research progresses of nanogeochemistry. So...

Controversial reports regarding Stöber silica's microporosity and specific surface area remain in the literature despite its decades of widespread applications. In this work, Stöber silica samples prepared with controlled reaction time and post-synthesis washing/drying conditions were characterized by nitrogen adsorption at 77 K, transmission elect...

Three different silica filler materials were thermally treated in order to effect dehydration, dehydroxylation, and rehydroxylation. Samples were characterized by thermogravimetry (TG), pycnometry, elemental analysis, and scanning electron microscopy (SEM). For all fillers, our results indicate incremental removal of silanol groups at higher heatin...

Background: The hierarchically ordered structure of hard biological tissues is believed to be a critical feature contributing to their outstanding mechanical properties. We have developed ordered composites with a colloidal-crystalline filler arrangement. Objectives: To evaluate the effects of filler pretreatment, silanization, resin, and initiator...

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Background: We previously manipulated silanol density of silica fillers through decontamination, dehydration/dehydroxylation, and rehydroxylation. The hypothesis is that optimized surface preparation can enhance silanization efficiency. Objectives: To evaluate the effects of filler pretreatments on the silanization of three submicron silica fille...

Methods to prepare dental composites with a periodic filler arrangement were developed following a strategy of colloidal crystallization. The aims of this study were to determine the influence of suspension medium, silane treatment and amine additive on colloidal particle redispersion and subsequent ordering, and to evaluate the effect of filler or...

Particle size has been shown to have significant effects on the mechanical and physical properties of particle-reinforced composites. However, most studies focus on experiments; few numerical simulations are available. The reason is that in traditional periodic unit cells or representative volume elements (RVEs), the particle diameter has a linear...

Salt-induced polymer gelation and nanocrystal fabrication in a polymer−salt system of Pluronic surfactant L35 (E11P16E11) and saturated CdCl2 aqueous solution were studied by means of small-angle X-ray scattering (SAXS), wide-angle X-ray diffraction (WAXD), and transmission electron microscopy (TEM). The symbols E11 and P16 denote the ethylene oxid...

Giant, hollow and spherical polyoxomolybdate nanomolecules, which represented the largest inorganic molecule so far, was prepared from the slow decomposition of an unstable precursor compound MoO2(OH)(OOH) in the presence of PEO-containing triblock copolymer gels or concentrated polyethylene oxide (PEO) homopolymer solutions. SAXS and TEM measureme...

A polymer-mediated synthetic pathway to a polyoxomolybdate nanomaterial is investigated in this work. Block copolymers or homopolymers containing poly(ethylene oxide) (PEO) are mixed with a MoO2(OH)(OOH) aqueous solution to form a golden gel or viscous solution. As revealed by synchrotron X-ray scattering measurements, electron microscopy, and othe...

A highly ordered, porous nanoscale network structure of polyoxomolybdate was prepared from the slow decomposition of an unstable precursor compound MoO(2)(OH)(OOH) in the presence of PEO-containing triblock copolymer gels or semidilute/concentrated poly(ethylene oxide) (PEO) homopolymer solutions. Small-angle X-ray scattering (SAXS) and wide-angle...

Static and dynamic light scattering experiments were performed to characterize the copolymer of tetrafluoroethylene (TFE) and perfluoromethyl vinyl ether (PMVE). Solvents of perfluoro-2-butyltetrahydrofuran (FC-75) and Flutec PP11 (PP11) were used to dissolve the TFE-PMVE copolymer. By taking advantage of the solvent properties of FC-75 and PP11, h...