Designing nanoarchitecture for environmental remediation based on the clay minerals as building block

Manipulation of the halloysite clay nanotube lumen for environmental remediation: a review

“…With the rise of nanoscience in recent decades, the manipulation or modification of various clay minerals to prepare advanced environmental remediation materials has become a research hotspot. [2][3][4] Halloysite is a polymorph of kaolinite. Unlike the 1-D nano-platy kaolinite, halloysite usually exhibits a 2-D nanotubular morphology due to the curling of the 1 : 1 (TO) unit layer (Fig.…”

Efficient Negative Photochromism by the Photoinduced Migration of Photochromic Merocyanine/Spiropyran in the Solid State

“…Organophilic clay, which has cationic surfactants in the interlayer space of the smectite group of clay minerals, is regarded as a unique platform of hydrophobic character . Mixing an organophilic clay with a mesoporous silica containing MC was reported to achieve efficient negative photochromism of SP/MC, where the organophilic clay accommodated the hydrophobic colorless isomer (SP). , The diffusion of SP is thought to be affected by the differences in the structural characteristics of organophilic clays; the application of various organophilic clays to accommodate SP differently is worth investigating in order to design the negative photochromism through the photoinduced migration.…”

“…Mixing an organophilic clay with a mesoporous silica containing MC was reported to achieve efficient negative photochromism of SP/MC, where the organophilic clay accommodated the hydrophobic colorless isomer (SP). , The diffusion of SP is thought to be affected by the differences in the structural characteristics of organophilic clays; the application of various organophilic clays to accommodate SP differently is worth investigating in order to design the negative photochromism through the photoinduced migration. Molecular diffusion of organic dyes in organophilic clays is thought to depend on the molecular structure of the surfactants through the hydrophobicity and the packing in the interlayer space. ,, Longer and larger number of alkyl chains led higher hydrophobicity of organophilic clays , so that dioctadecyldimethylammonium (2C18 shown in Figure a)-exchanged clays have been used extensively for many applications including adsorption/separation, catalyst’s support, and so on. ,, In addition to the expansion of the interlayer space and the hydrophobicity, the states of the surfactants affect the diffusion of guest species . In the present study, an organophilic clay modified with dioleyldimethylammonium ions (DODA, shown in Figure a) , was used.…”

S-Carvone Formulation Based on Granules of Organoclay to Modulate Its Losses and Phytotoxicity in Soil

“…Specifically, organoclays, which are the nanohybrid materials resulting from the intercalation of a surfactant or other organic cations or polymers [29][30][31] into the interlayer of swelling clay minerals, are among the most studied pesticide sorbents [32,33]. The exchange of hydrated, inorganic cations for organic ones changes the original hydrophilic surfaces of clays to hydrophobic, yielding materials with wide environmental applications and biocompatibility to be used in cosmetics, pharmaceutics, and medicine [29,[34][35][36][37]. For example, clays can be selectively modified to sorb a particular pesticide, choosing the chemical characteristics of the modifier [29,38,39].…”

“…For example, clays can be selectively modified to sorb a particular pesticide, choosing the chemical characteristics of the modifier [29,38,39]. Accordingly, organoclays show exceptional properties to be used as filters for water decontamination [40], soil amendments for contaminant immobilization [41], or supports for the slow release of agrochemicals [35]. In organoclay-based pesticide formulations, the pesticide availability is controlled, minimizing undesirable transport losses, reducing possible toxicity on non-target organisms, and preventing extensive dissipation of the agrochemical [42].…”