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Scope and Application of Bionanotechnology for the Bioremediation of Emerging Contaminants Generated as Industrial Waste Products
Published in Naveen Dwivedi, Shubha Dwivedi, Bionanotechnology Towards Sustainable Management of Environmental Pollution, 2023
Md Shahid Alam, Surabhi Rode, Harry Kaur, Sapna Lonare, Deena Nath Gupta
Materials with greater porosity have significant applications for the development of nanoparticles. Among the several materials, silica-based nanoparticles have excellent potential as they degrade several classes of pesticides. The silica-based nanoparticles are employed to immobilize catalytic species such as enzymes. This adsorbent has a greater range of potential due to its flexibility, porosity, and stability. Silica nanoparticles (SiNPs) possess a larger surface area and are functionalized by conjugating with different biochemical entities. SiNPs are employed either as nanosheets or in the form of spheres. Owing to larger surfaces, the tailoring of enzyme loading densities dramatically aids in the remediation of environmental contaminants such as pesticides. Researchers have designed mesoporous silica with desirable pore diameter, particle morphology, and size for several catalytic reactions. Different entities can be associated with SiNPs, such as enzymes or microorganisms, to degrade the environmental contaminants.
Polymer Silica Nanocomposite Gel Electrolytes for Lithium-Ion Batteries
Published in Prasanth Raghavan, Fatima M. J. Jabeen, Polymer Electrolytes for Energy Storage Devices, 2021
Akhila Das, Anjumole P. Thomas, Neethu T. M. Balakrishnan, Nikhil Medhavi, Jou-Hyeon Ahn, Fatima M. J. Jabeen, Prasanth Raghavan
Methacrylate was used as an organic modifier for mesoporous silica particles synthesized from TEOS, as shown in Figure 10.7 [51]. The report reveals that the non-porous silica particles block Li+-ion transport. Thus, mesoporous silica was synthesized through surfactant-assisted synthesis. The polymeric electrolyte membrane was fabricated by electrospinning of PAN. followed by soaking in 5 wt.% of methacrylate-modified mesoporous silica ( MA-SiO2 ) and with nonporous silica particles, as morphological studies illustrated in Figure 10.8. The dried membrane was soaked in a 1.15 M LiPF6 in ethylene carbonate/ethyl methyl carbonate (EC/DMC) solvent to form a gel polymer electrolyte and showed a room temperature ionic conductivity of 1.1 × 10−3 and 1.8 × 10−3 S cm−1 for non porous and mesoporous silica incorporated electrolyte membranes respectively. The cell was fabricated with graphite as the anode and LiNi1/3Col/3Mn1/3O2 as the cathode, separated with PAN/silica polymer gel electrode delivered an initial charge capacity of ~180 mAh g−1.
Metals, Metal Oxides, and Their Composites—Safety and Health Awareness
Published in Vijay B. Pawade, Paresh H. Salame, Bharat A. Bhanvase, Multifunctional Nanostructured Metal Oxides for Energy Harvesting and Storage Devices, 2020
Mesoporous Si is a family of synthetically designed silica in colloidal form wherein an array of highly ordered and mesoscale (2–50 nm) pores are generated by way of the self-assembling (templating) technique of amphiphiles, especially micelles derived from emulsifying agents. Decomposition of silicates thermally around the surfactant molecules by templating them facilitates the formation of mesoporous SiO2 with a highly ordered network of pores. Mesoporous silica is used preferentially as drug-delivery carriers, by virtue of its distinct properties attributed to a highly ordered pore network, controllable pore sizes and volumes, large and functional surface area, which holds a huge potential as a candidate for drug loading, delivery, and its controlled release. Moreover, mesoporous-SiO2 is used to deposit several nanocrystals to get rid of the core material toxicity. Mesoporous SiO2-based materials with an array of highly ordered pores have been synthesized and characterized thoroughly so far [374].
Dual-particles functionalized hybrid biosorbent based on a facile etching-loading method for Pb2+ adsorption
Published in The Journal of The Textile Institute, 2023
Xiaoyan Hu, Leigen Liu, Xibo Hao, Jin Tao
Currently, mesoporous silica is investigated intensively and adopted in a wide variety of applications including adsorption, nanoreactor and protein separation. Owing to high surface area, high hydrothermal stability and easy-modified surface, mesoporous silica is considered a promising functional adsorbent and have attracted considerable attention in various applications of efficient adsorption. Gupta and colleagues synthesized a maltodextrin functionalized SBA-16 mesoporous silica for selective adsorption of heavy metal ions including Cd2+, Zn2+, and Cu2+ from aqueous solution, and the adsorbent shown high values of adsorption capacity for Cd2+ (575.53 mg/g), Zn2+ (564.67 mg/g), and Cu2+ (509.73 mg/g), respectively (Gupta & Pathak, 2021).
A heterogeneous mesoporous catalyst based on anchored copper: Schiff base complex into SBA-15 for the synthesis of benzimidazoles from orthoesters
Published in Inorganic and Nano-Metal Chemistry, 2022
Ghasem Rezanejade Bardajee, Shohreh Hekmat, Aseyeh Ghaedi, Farideh Goudarzi
Porous materials with high surface area and very diverse content have been regarded fascinating resources for numerous technological applications due to their porous and morphological features. Since the introduction of mesoporous silica materials by Stucky and coworkers in 1998, some of them are used as heterogeneous catalyst.[1,2] Special attentions have been focused on SBA-15 due to its wide applications as stationary phases for liquid chromatography, supports for immobilizing of biomolecules, agents for polymers reinforcement and templates for the synthesis of materials.[2,3] Mesoporous materials are mainly demanding in this context because they have uniform pores of nanoscale dimensions and plenty of well-distributed active sites, which could help the distribution of large reactant molecules through the pore channels. A varied variety of organic transformations that contain large substrate molecules, such as the acid-or base-catalyzed reactions, synthesis organic compound, and size- and shape-selective isomerization are completed very efficiently over these materials with nanoscale porosity.[4,5]
Synthesis of Adsorbents with Anion Exchange and Chelating Properties for Separation and Recovery of Precious Metals – A Review
Published in Solvent Extraction and Ion Exchange, 2020
The anion-exchange groups introduced onto inorganic matrices attract much attention due to the high capacity, reusability, and relatively attractive price of such materials. Awual et al.[59] proposed a composite adsorbent based on mesoporous silica-bearing ligands derived from 5-tert-butyl-2-hydroxybenzaldehyde thiosemicarbazone (THTB) shown in the Figure 9a. The synthesis procedure involved obtaining mesoporous silica via a templating method, where copolymer of ethyleneoxide-b-propyleneoxide-b-ethyleneoxide was used as a soft template during sol-gel synthesis of the silica support. Then, the THTB functionalities were introduced indirectly, through prior polarization of the matrix using dilauryl dimethyl ammonium bromide. The so-obtained inorganic/organic material possessed an extraordinary affinity towards Pd(II) ions attributed to two main factors. Firstly, the availability of functionalities was ensured by the ordered hexagonal structure of silica matrix pores, here shown in Figure 10. Secondly, the presence of multiple N, O, and S chelating atoms allowed the complexation of Pd(II) through the mechanism displayed in Figure 9b. As the result, the so-prepared composite allowed not only to remove Pd(II) from solutions in HCl at pH 3.5 (capacity reached 178 mg Pd g–1), but also to detect palladium, by observing changes in the appearance of the yellow color of the material.[59]