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Utilization of rice husk as a material for production of activated carbon for environmental treatment: A review

AIP Conference Proceedings 2024年第1期3014卷

作者： Ngoc Bich Hoang Thi Kim Ngan Tran Thi Cam Quyen Ngo Lam Van Tan Institute of Environmental Technology and Sustainable Development Nguyen Tat Thanh University Ho Chi Minh City 700000 Vietnam Faculty of Food and Environmental Engineering Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Center of Excellence for Functional Polymers and NanoEngineering Nguyen Tat Thanh University Ho Chi Minh City Vietnam Center of Excellence for Agri-Food Processing and Ecosystem Management Nguyen Tat Thanh University Ho Chi Minh City Vietnam Ben Tre’s Department of Science and Technology Ben Tre Province 86000 Vietnam

Successful utilization of rice husk, which accounts for approximately 20% of weight of rice grain, carries strong implications in reducing agricultural waste and devising cost-effective materials for environmental applications. This review focuses on summarizing approaches to produce activated carbon, an important adsorbent material used in wastewater treatment, from rice husk material. Activated carbon from rice husk has been synthesized by methods such as chemical, physical and physicochemical. Which, physicochemical methods were mainly used with activators such as KOH, NaOH, ZnCl2, HCl, and K2CO3. The structural properties of the materials were analyzed using physical analytical methods. The shape of rice husks activated carbon was the same a honeycomb network, which was typical for the activated carbon. Surface functional groups and crystal structure characteristics were also noted with characteristic functional groups and crystal structures with large specific surface areas. The adsorption capacity of the material has also been specifically reported. Treatment efficiency reached 70% of pollutants such as dyes, heavy metals, phenols and other organic compounds. The kinetic and isothermal models were showing good agreement with the Langmuir, Freundlich and PSO.

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Activated Carbon based Rice Husk for Highly Efficient Adsorption of Methylene Blue: Kinetic and Isotherm

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IOP Conference Series: Materials Science and Engineering 2021年第1期1092卷

作者： T V Tan H T T Nguyen NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Vietnam Center of Excellence for Green Energy and Environmental Nanomaterials Nguyen Tat Thanh University Ho Chi Minh City Vietnam Center of Excellence for Functional Polymers and NanoEngineering Nguyen Tat Thanh University Ho Chi Minh City Vietnam

Agricultural waste is a resource that is renewable and readily available and is used as a precursor to coal synthesis in industry. In this study, agricultural waste from rice husk was used as precursors to prepare activated carbon, which was activated by KOH. The effectivity factors including time contact, concentration, pH solution, and sorbent dosage play an important role in removing MB in water media. Moreover, the MB adsorption efficiency reached over 80 % at a concentration of 50 mg/L, pH 8 within 180 minutes. The kinetic analysis via pseudo-first-order, pseudo-second-order, Bangham, and Temkin model showed that MB adsorption followed pseudo-second-order (R2 = 0.99934). The fitness of equilibrium data to popular isotherm equations such as the Langmuir, Freundlich, Elovich, Temkin and Dubinin-Radushkevich were carried out. Among all tested isotherm models, Langmuir model is the best fitted to equilibrium data (R2 = 0.99924). The results of this study show that activated carbon made from rice husk has the potential to be used to remove the dye in wastewater treatment.

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Porous nanosilica hybrids biocompatible polymer for enhancing anticancer drugs loading efficiency and targeted delivery 9

Porous nanosilica hybrids biocompatible polymer for enhancin...

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9th International Conference of Materials Processing and Characterization, ICMPC 2019

作者： Vo, Uyen Vy Nguyen, Thi Hiep Gallais, Manon Vu-Quang, Hieu Nguyen, Cuu Khoa Lam, Tri Duc Nguyen, Duy Chinh Bach, Long Giang Nguyen, Dai Hai Graduate University of Science and Technology Vietnam Academy of Science and Technology Hanoi Viet Nam Institute of Applied Materials Science Vietnam Academy of Science and Technology Ho Chi Minh city Viet Nam Ho Chi Minh City Viet Nam NTT Institute of Hi-Technology Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Center of Excellence for Functional Polymers and NanoEngineering Nguyen Tat Thanh University Ho Chi Minh City Viet Nam

Porous nanosilica nanoparticles (PNS) is a fascinating candidate for drug delivery systems (DDS) due to its meso-porous structure. However, burst release from the unmodified PNS nanoparticles is remained as a disadvantage of this material. In this study, we aim to produce PNS@Chitosan-PEG, a smart nanoparticles that can control the release of doxorubicin (Dox) dependent on the pH of the environment. The nanoparticles after modification was spherical with size about 65nm ± 15, which revealed by transmission electron microscopy (TEM). The Dox loading efficiency and capacity was 57.81% and 11.79% respectively. In vitro Dox release from PNS@Chitosan-PEG nanoparticles at pH 4.5 is significantly higher than the its release at pH 7.4 (76.4% vs 42.4%). These results suggested that our nanoparticles had showed potential application in cancer therapy. © 2019 Published by Elsevier Ltd.

关键词： Nanoparticles

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Development of Response Surface Methodology for Optimization of Congo Red Adsorption Utilizing Exfoliated Graphite As An Efficient Adsorbent

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Materials Today: Proceedings 2020年 22卷 2341-2350页

作者： Thinh Van Pham Thuan Van Tran Trinh Duy Nguyen Nguyen Thi Hong Tham Phan Thanh Tri Quang Dao Thi To Uyen Nhan Thi Hong Le Dai-Viet N. Vo Nguyen Trung Thanh Long Giang Bach NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Graduate University of Science and Technology Vietnam Academy of Science and Technology Ha Noi City Viet Nam Center of Excellence for Green Energy and Environmental Nanomaterials Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Department of Chemical Engineering Pukyong National University Busan South Korea Ho Chi Minh City University of Technology Vietnam National University-Ho Chi Minh City Ho Chi Minh City 703500 Viet Nam Faculty of Chemical and Natural Resources Engineering Universiti Malaysia Pahang Malaysia Deparment of Environmental Engineering An Giang University Long Xuyen City An Giang Province Viet Nam Center of Excellence for Functional Polymers and NanoEngineering Nguyen Tat Thanh University Ho Chi Minh City Viet Nam

In the present study, we developed an optimization model of CR adsorption onto EG using response surface methodology (RSM) as a statistical tool. The EG was structurally characterized using several techniques such as scanning electron microscope (SEM), estimation of N 2 adsorption/desorption isotherm and plotting of pore size. The EG was used as adsorbent to remove the CR from water. Three variables involving concentration (20-50 mg/L), pH (4-10), adsorption time (0-210 min) were investigated. To find out the optimal condition, we adopted Design Expert software-based RSM for the experimental design, 3D surface plotting, and optimization. The optimal results were found at concentration of 48.3 mg/L, and contact time of 188 min for the highest CR adsorption capacity at 53.423 mg/g. With high compatibility via confirmation test, it is suggested that the RSM can be the suitable method to optimize the adsorption of CR onto EG

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A Simple Route for the Synthesis of Fe/C composite derived from the metal-organic framework MIL-53 (Fe) 9

A Simple Route for the Synthesis of Fe/C composite derived f...

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9th International Conference of Materials Processing and Characterization, ICMPC 2019

作者： Nguyen, Duyen Thi Cam Le, Hanh Thi Ngoc Van Tran, Thuan Nguyen, Oanh Thi Kim Nguyen, Trinh Duy Sy, Do Trung Vo, Dai-Viet N. Lam, Tri Duc Bach, Long Giang Van Thuan, Doan NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Faculty of Pharmacy Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Institute of Hygiene and Public Health Ho Chi Minh City Viet Nam Center of Excellence for Green Energy and Environmental Nanomaterials Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Department of Chemical Engineering Pukyong National University Busan Korea Republic of Institute of Chemistry Vietnam Academy of Science and Technology Hanoi Viet Nam Faculty of Chemical and Natural Resources Engineering Universiti Malaysia Pahang Malaysia Center of Excellence for Functional Polymers and NanoEngineering Nguyen Tat Thanh University Ho Chi Minh City Viet Nam

The Fe/C composite plays the crucial role in various practical applications, therefore, the synthesis of this composite has attracted much attention. Herein, we described the simple method for the synthesis of Fe/C composite derived from the metal-organic framework MIL-53 (Fe). The MIL-53 (Fe) precursor was initially fabricated using the solvothermal strategy, and transformed into porous Fe/C via a direct pyrolysis procedure. Both MIL-53 (Fe)and Fe/C were also characterized using the several techniques to compare the change of crystalline profile, surface chemistry, morphological property, saturation magnetization, pH point of zero charge and surface area among them. The surface areas measured revealed an enormous change from 7.6 m2/g in MIL-53 (Fe) to 196.1 m2/g in Fe/C the Raman spectra also gave evidence of the presence of graphitic carbon in the Fe/C structure. © 2019 Elsevier Ltd.

关键词： Characterization Fe/C composite Metal-organic framework MIL-53 (Fe)

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Removal of Anionic Azo Dye from Aqueous Solution Using the Magnetic NiFe2O4 Decorated-Exfoliated Graphite

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IOP Conference Series: Materials Science and Engineering 2020年第1期991卷

作者： L V Tan N T H Tham P V Thinh NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Vietnam. Center of Excellence for Green Energy and Environmental Nanomaterials Nguyen Tat Thanh University Ho Chi Minh City Vietnam Center of Excellence for Functional Polymers and NanoEngineering Nguyen Tat Thanh University Ho Chi Minh City Vietnam

Environmental issues have recently become more prevalent with the rapid development of global industrialization. Organic dyes, a common pollutant, are compounds which are constituted by benzene rings, making them stable and presenting a pollution source that is harmful to human health. In this study, a new nanocomposite adsorbent was fabricated using exfoliated graphite (EG) and NiFe2O4 and evaluated for adsorption capacity against Congo Red (CR) dye. A number of reaction parameters (pH, CR concentration, dosage and contact time) that affect CR adsorption were considered. The successful synthesis of EG@NiFe2O4 was confirmed by FT-IR analysis. Herein, EG@NiFe2O4 and NiFe2O4 adsorbent with dosage of 0.5 g/L were used to removal 100 mL of CR dye at the concentration of 50 ppm. The results showed that adsorption equilibrium was achieved after 120 min for both adsorbents (EG@NiFe2O4 and NiFe2O4). The optimal working pH for adsorption using EG@NiFe2O4 and NiFe2O4 was 6 and 4 respectively. EG@NiFe2O4 could be reused for up to three times without significant loss of adsorption capacity.

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Carboxymethyl Jackfruit Seed Starch: synthesis, characterization, and influence of reaction parameters

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IOP Conference Series: Materials Science and Engineering 2021年第1期1092卷

作者： C K Van P N T Nguyen T Y N Tran H C Mai T L Tran T Q Nguyen NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Vietnam Center of Excellence for Functional Polymers and NanoEngineering Nguyen Tat Thanh University Ho Chi Minh City Vietnam Department of Chemical Engineering and Processing Nong Lam University Thu Duc district Ho Chi Minh City 700000 Vietnam Agro-Forestry-Fisheries Quality Assurance Department Tien Giang Province Vietnam Center for Agricultural Extension and Services Tien Giang Province Vietnam

Carboxymethyl jackfruit seed starch (CMS) was synthesized under different reaction conditions. The influence of sodium hydroxide concentration, monochloroacetic acid (MCA) concentration, IPA-water ratio, solvent-starch ratio, reaction time, and temperature were evaluated for degree of substitution (DS). Results have shown that the optimal DS of 0.68 was obtained at 50 °C, 90 minutes in solvent-starch ratio and isopropanol-water were 8:1 and 10:0. The ratio of sodium hydroxide and monochloroacetate acid moles to anhydroglucose unit (AGU) moles for the optimal DS were 1 and 1. Scanning electron microscope (SEM) of CMS particles showed the starch grain structure remains the same but the surface appeared many alveolar holes and no longer smooth as MS. Fourier transform infrared spectra (FTIR) of CMS and MS confirmed that carboxymethylation takes place on native starch molecules when the absorption band appears at a wavenumber of 1643 cm−1 corresponding to the vibrations of featured functional C=O group in CMS structure.

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Effect of Wet Milling and Purification Process on Yield and Color of Jackfruit Seed Starch

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IOP Conference Series: Materials Science and Engineering 2020年第1期991卷

作者： V T Thanh V C Khang N P T Nhan D T Nguyen T T B Nhi N T Quoc NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Vietnam Center of Excellence for Biochemistry and Natural Products Nguyen Tat Thanh University Ho Chi Minh City Vietnam Center of Excellence for Functional Polymers and NanoEngineering Nguyen Tat Thanh University Ho Chi Minh City Vietnam Center for Agricultural Extension and Services Tien Giang Province Vietnam

Jackfruit is a common fruit, which grows in Asian areas, including Thailand, India, China and Vietnam. Jackfruit seeds are a by-product of the food industry, and are typically ignored as a source of nutrients in the human diet given their possible application.. Starch production is a conventional ways to take advantage of this by-product source. The wet milling and purification process are the two main processes for extracting and improving the color of starch. Therefore, this research aims to determine the impact of wet milling and purification process on yield and color of starch as well as evaluate some parameters of physicochemical properties in jackfruit seed starch. In this study, the ratio of jackfruit seed:water (1:1, 1:2, 1:3, 1:4 and 1:5) and the time of wet milling (1, 2, 3, 4 and 5 min) are investigated. Three main factors observed in the purification process were the type of solvent (water and ethanol), solvent ratio (1:2, 1:4, 1:6 and 1:8) and the number of purification (1, 2, 3, 4 and 5 times). The result revealed that the ratio of jackfruit seed : water reached the highest starch yield was 1:3 (32.11±1.06%, db) and the time achieved 3 min (40.77±1.25%, db). The selected solvent for purification of starch was ethanol with the ratio of sample : water was 1:4 and the number of purification was two times for the best color. Some of characteristic nutrition values was evaluated, including %protein: 3.8, %ash: 0.08, %carbohydrate 86.99 and %lipid 0.20). The water solubility index and viscosity of starch were contradictory. When the temperature increased, the viscosity of starch decreased but the solubility index increased. Jackfruit seed starch was spherical or semi-oval which was presented by SEM (Scanning Electron Microscope) method.

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Development of Response Surface Methodology for Optimization of Congo Red Adsorption Utilizing Exfoliated Graphite As An Efficient Adsorbent 2

Development of Response Surface Methodology for Optimization...

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2nd International Conference on Materials Manufacturing and Modelling, ICMMM 2019

作者： Van Pham, Thinh Van Tran, Thuan Duy Nguyen, Trinh Thi Hong Tham, Nguyen Thanh Tri Quang, Phan Thi To Uyen, Dao Thi Hong Le, Nhan Vo, Dai-Viet N. Trung Thanh, Nguyen Giang Bach, Long NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Graduate University of Science and Technology Academy of Science and Technology Ha Noi City Viet Nam Center of Excellence for Green Energy and Environmental Nanomaterials Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Department of Chemical Engineering Pukyong National University Busan Korea Republic of Ho Chi Minh City University of Technology Vietnam National University-Ho Chi Minh City Ho Chi Minh City703500 Viet Nam Faculty of Chemical and Natural Resources Engineering Universiti Malaysia Pahang Malaysia Deparment of Environmental Engineering An Giang University An Giang Province Long Xuyen City Viet Nam Center of Excellence for Functional Polymers and NanoEngineering Nguyen Tat Thanh University Ho Chi Minh City Viet Nam

In the present study, we developed an optimization model of CR adsorption onto EG using response surface methodology (RSM) as a statistical tool. The EG was structurally characterized using several techniques such as scanning electron microscope (SEM), estimation of N2 adsorption/desorption isotherm and plotting of pore size. The EG was used as adsorbent to remove the CR from water. Three variables involving concentration (20-50 mg/L), pH (4-10), adsorption time (0-210 min) were investigated. To find out the optimal condition, we adopted Design Expert software-based RSM for the experimental design, 3D surface plotting, and optimization. The optimal results were found at concentration of 48.3 mg/L, and contact time of 188 min for the highest CR adsorption capacity at 53.423 mg/g. With high compatibility via confirmation test, it is suggested that the RSM can be the suitable method to optimize the adsorption of CR onto EG © 2019 Elsevier Ltd.

关键词： Adsorption

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Adsorption behavior of Congo red dye from aqueous solutions onto exfoliated graphite as an adsorbent: Kinetic and isotherm studies 9

Adsorption behavior of Congo red dye from aqueous solutions ...

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9th International Conference of Materials Processing and Characterization, ICMPC 2019

作者： Van Pham, Thinh Van Tran, Thuan Nguyen, Trinh Duy Tham, Nguyen Thi Hong Quang, Phan Thanh Tri Uyen, Dao Thi To Le, Nhan Thi Hong Vo, Dai-Viet N. Thanh, Nguyen Trung Bach, Long Giang NTT Hi-Tech Institute Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Graduate University of Science and Technology Vietnam Academy of Science and Technology Ha Noi City Viet Nam Center of Excellence for Green Energy and Environmental Nanomaterials Nguyen Tat Thanh University Ho Chi Minh City Viet Nam Department of Chemical Engineering Pukyong National University Busan Korea Republic of Ho Chi Minh City University of Technology Vietnam National University-Ho Chi Minh City Ho Chi Minh City703500 Viet Nam Faculty of Chemical and Natural Resources Engineering Universiti Malaysia Pahang Malaysia Deparment of Environmental Engineering An Giang University Long Xuyen City An Giang Province Viet Nam Center of Excellence for Functional Polymers and NanoEngineering Nguyen Tat Thanh University Ho Chi Minh City Viet Nam

Herein, we reported a facile method to fabricate the exfoliated graphite (EG) by Hummer's method via a two-step procedure including intercalation with a mixture of oxidants (H2O2 and H2SO4), and exfoliation using a microwave system. For the adsorption experiments, effect of contact time (0-210 min), initial concentration (20-60 mg/L), pH (4-10), and EG dosage (0.3- 0.7 g/L) were systematically studied. Moreover, the adsorption kinetics (pseudo-first-order, pseudo-second-order, Elovich, and Bangham) and isotherms (Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich) were carried out to elucidate the mechanism of CR adsorption over EG. Due to high porosity (40.95 m2/g) and large maximum adsorption capacity of CR (80.775 mg/g), the EG derived from natural graphite can be an effective adsorbent for CR dye treatment in aqueous solution. © 2019 Published by Elsevier Ltd.

关键词： Adsorption

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