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Kausar, Ayesha; Ahmad, Ishaq; Lam, Tran Dai
2024 Pure and Applied Chemistry
AbstractImmense research efforts on graphene or graphene oxide have led to the formation of unique nanocarbon derived nanomaterials. Graphene and graphene oxide have been reinforced in polymeric matrices to form high performance nanocomposites. Significant applications of polymer nanocomposites with graphene or graphene oxide were experiential for nanofiber formation and ensuing membranes. This overview highlights design, essential features, and potential of graphene or graphene oxide derived nanocomposite nanofibrous membranes for water remediation permeation towards contaminates, salts, toxins, microbials, and other separation purposes. Here, polymer filled graphene or graphene oxide nanocomposites have been processed into nanofibers using appropriate techniques such as electrospinning, wet spinning, template method, etc. Afterwards, polymer/graphene and polymer/graphene oxide nanofiber nanocomposites were applied to form the nanocomposite membranes using appropriate techniques like solution processing, casting methods, infiltration, etc. Consequently, high performance membranes have been researched for technological purposes, especially water management competence. Future research on polymer/graphene nanofibrous membranes may lead to highly efficient systems for commercial and industrial level uses.
Pham, Thi Nam; Nguyen, Thi Thom; Huynh, Le Thanh Nguyen; Le, Viet Hai; Nguyen, Thi Kim Ngan; Nguyen, Tuan Anh; Shuib, Raa Khimi; Tran, Dai Lam; Nguyen, Tuan Anh
2024 Pure and Applied Chemistry
AbstractThe use of graphene (GE) as a conductive additive for activated carbon (AC) electrode in capacitive deionization (CDI) has attracted much attention due to its high electrical conductivity. However, self-agglomeration by π–π interactions between individual GE sheets required the use of high content to ensure an efficient conductive network in the electrode, which limited its practical application. This work proposed an approach to reduce the GE content in the fabrication of biomass-based activated carbon electrode for CDI application. The stacking effect of GE sheets is inhibited when GE sheets functionalize with oxygen groups via acid treatment under ultrasonic condition. This helps to reduce GE content to less than 2 wt% in the fabrication of CDI electrodes. The electrode fabricated using 2 wt% treated GE (T-GE) achieved the superior capacitance of 54 F/g, twice that of the pristine AC. The desalination process using as-prepared electrodes was evaluated by batch-mode CDI system with the initial NaCl solution of 2000 ppm and 3000 ppm at various applied voltages. The AC/T-GE 2 % electrode showed excellent performance with a desalination capacity greater than 10 mg/g, and reached an adsorption rate of 1.93 mg/g.min in both solutions under an applied voltage 1.2 V.
Doan, Nhuan N.; Nguyen, Ha T.; Nguyen, Luan T.; Tran, Lam D.; Phan, Tuan D.; Nguyen, Tien A.; Nguyen, Linh T. T.
2024 Pure and Applied Chemistry
AbstractIn this study, the plant biomass from the phytoremediation was recovered, prepared, and investigated catalytic ability for the α-pinene isomerization. The results show that the Fe_loaded AAL biochar can catalyze the isomerization of a-pinene, with the α-pinene conversion of 90.5 % and the selectivities for monocyclic terpenes (limonene, terpinolene and γ-terpinene) of 57.1 %, bicyclic terpene (camphene) of 24.6 %. Iron in the plant biomass from phytoremediation is considered a decisive factor that heightened the conversion of α-pinene and the yield of isomers. This research has initially opened up a new application for the plant biomass absorbing heavy metal from the phytoremediation stage to resolve contaminants efficiently.
Nguyen, Oanh H.; Nguyen, Huy T. A.; Nguyen, Luon Tan; Do, Nga H. N.; Tran, Lam Dai; Tran, Viet T.; Le, Phung K.; Le, Kien A.
2024 Pure and Applied Chemistry
AbstractBiomass-based aerogels are of interest due to their abundant precursors, ease of functionalization, eco-friendliness, low cost, and effectiveness in dye-contaminated water treatment. Coconut pith (CP) known as a by-product after coconut processing is a sponge-like and lightweight material discarded in large volumes. For the first time, carbon micro-particles resulting from two-step treatment and pyrolysis of CP have been successfully incorporated with chitosan to produce aerogel composites by high-speed homogenization and freeze-drying. After pretreatment, holocellulose content and crystallinity index of the recovered CP pulp are respectively 75.4 and 58.6 % along with a solid recovery rate of 27.5 %. Characteristic properties of the aerogel composites are featured by their density as low as 15.23–28.17 mg/cm3, remarkably high porosity of 98.17–99.05 %, and Young’s modulus of 1.64–12.23 kPa. Synergistic effects of the porous network, electrostatic interactions between both amine groups in chitosan and carbon surface with methyl orange (MO) cause the as-fabricated aerogel composites to achieve an extremely high adsorption capacity of 454.13 mg/g and removal efficiency of 92.32 % at initial MO concentration of 500 mg/L. Therefore, the CP-derived carbon/chitosan aerogel composites synthesized from a feasible procedure exhibit their great potential in enhancing the value of coconut waste and dealing with dye-contaminated water pollution by simple and economical adsorption.
Bui, Van Cuong; Pham, Thi Lan; Nguyen, Thi Lam; Tran, Thi Kim Chinh; Le, Thi My Hanh Le; Vu, Xuan Minh; Le-Deygen, Irina M.; Nguyen, Chau Anh; Mai, Thanh Tung; Shuib, Raa Khimi
2024 Pure and Applied Chemistry
AbstractThis study aims to synthesize inclusion complex derived from sorafenib (Sor) and hydroxypropyl-β-cyclodextrin (HPβCD) (denoted as [Sor-HPβCD]). The complex of Sor with HPβCD has been synthesized in a mixed solvent of H2O-DMSO, with a DMSO volume fraction of 80 %. The results of FTIR, DSC, and UV–Vis analysis have demonstrated the success of complex formation: the intensity of some characteristic peaks for the Sor binding decreased after complex formation, indicating that a part of the guest molecule has entered the cavity of the HPβCD molecule. This is further supported by the DSC analysis results, showing the transformation of the complex’s crystalline form to an amorphous form. The phase solubility diagram study also indicates that the solubility of Sor significantly increases, approximately 7 times higher than pure Sor, after complex formation. The results of the cell growth inhibition activity test in a water environment show that the complex inhibits the growth of Hep-G2 cells with an IC50 value of 62.4 μg/mL, while pure Sor does not exhibit activity as it is practically insoluble in water.
Nguyen, Thien Vuong; Do, Truc Vy; Hoang, Thu Ha; Nguyen, Tuan Anh; Lu, Le Trong; Le, Thi Mat; Pham, Thanh Minh; Shuib, Raa Khimi; Tran, Dai Lam
2024 Pure and Applied Chemistry
AbstractThe purpose of this work is to fabricate the advanced organic antibacterial coating containing the strong photocatalytic nanomaterials. For this purpose, firstly the TiO2–Ag hybrid nanoparticles are synthesized by chemical reduction method. Then, the antibacterial coating based on acrylic polyol, polyisocyanate, and these TiO2–Ag hybrid nanoparticles has been prepared. Mechanical properties show that the optimal content of TiO2–Ag hybrid nanoparticles in the coating matrix is 2 wt%, with its abrasion resistance of 166.2 L/mil; impact strength of 195 kg cm; adhesion of size #1 and relative hardness of 0.78. In addition, FE-SEM analysis shows that the nanocomposite coating has a tight structure with homogeneous dispersion of TiO2–Ag nanoparticles in the polymer matrix. The paint film has good antibacterial activity and has great application prospects. Data from the antibacterial test indicates that in the presence of an acrylic polyurethane coating containing 2 wt% TiO2–Ag, the number of viable Escherichia coli decreased from 3.4 × 105 CFU/ml to 1.5 × 102 CFU/ml after 24 h of culture.
Musin, Lenar I.; Akhmadullin, Renat M.; Gizutdinov, Karim R.; Nigmatullina, Lilya Sh.; Lopukhov, Leonid V.; Zaripova, Anna N.; Nigamatullin, Dinar D.; Spiryagin, Valerii V.; Le, Huu Quynh Anh; Pham, Thi Nam; Dao, My Uyen; Lai, Hong Dung; Hoang, Hien Y
2024 Pure and Applied Chemistry
AbstractThis study presents a short communication on exploring, for the first time, a simple approach for the selective and highly effective synthesis of tricaproin by synergistically combining silicon tripolyphosphate and phosphoric acid in the catalytic esterification of glycerol with caproic acid. Results reveal that within the initial hour of the synthesis, the conversion in the presence of the proposed mixture achieved an efficiency of 62.99 %, whereas this figure for individual catalysts only modestly stopped at 27.50 and 11.74 %, respectively. Furthermore, the inherent shortcomings in the tricaprion synthesis, such as catalyst deactivation, resinification of the reaction solution, and generation of numerous by-products, were successfully addressed. The structure of the resultant tricaproin and the possible absence of undesired by-products were confirmed by NMR, mass spectrometry, FT-IR, and TLC. The optimal conditions for the synthesis were also investigated. The study not only contributes a practical and selective synthetic approach for tricaproin but also paves the way for exploring novel avenues to enhance the efficiency of the catalytic esterification.
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