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INFORMATION ON RESEARCH RESULTS

1. General information

• Project title: Research the ability to treat Cr (VI) in aqueous solution by adsorption process of modified materials recovered from solid waste
• Code number: ĐH2019-TN02-04
• Coordinator: TS. Hoang Le Phuong
• Implementing institution: Thai Nguyen University of Techlonogy
• Duration: from   03/2019 to 02/2021

2. Objective(s)

• Provide the method for modify two types of materials which recovered from solid waste (including corncob and snailshell) to increase the ability to adsorb Cr (VI) in wastewater.
• Evaluate the physical and chemical characteristics of two adsorbents which recovered from solid waste (corncob, snailshell).
• Investigate the Cr(VI) adsorption in aqueous solution using two absorbents.

3. Creativeness and innovativeness

• Research has developed the magnetic adsorbent which recovered from corncob and snail shell by the simple method to adsorb Cr (VI) treatment in wastewater.
• Research has determined the suitable impregnation ratio for each type of materials including corncob and snail shell and identified some important physical and chemical characteristics of the absorbent such as BET surface area, SEM and EDS, the crystalline structures XRD and FTIR functional groups in the adsorbents.
• Research has investigated the factors affecting the Cr(VI) adsorption of magnetic corncob and magnetic snail shell as well as the Cr(VI) adsorption mechanism.

4. Research results

• - Magnetic corncob biochar: suitable impregnation ratio of iron/corncob at 20% (w/w) (MCB20) for removal of Cr(VI) from aqueous solutions. In this study, the MCB20 had an outstanding Cr(VI) removal ability under acidic pH conditions. The physio-chemical properties data indicated that the Fe3+ ions were distributed uniformly on the surface of the corncob biochar. The synthesized magnetic biochar achieved a high magnetization and maintained the structure stability of magnetic particles after contacting with Cr(VI) solution at pH 3.0. The results demonstrated that the maximum adsorption capacity of Cr(VI) by MCB20 significantly increased after magnetization and reached 25.94 mg/g. The Sips and pseudo-second-order models fitted the best to experimental data with excellent correlation coefficients. The main mechanisms contributing to Cr(VI) adsorption onto MCB20 include: electrostatic attraction, anion exchange, and adsorptioncoupled reduction. All adsorption mechanisms between Cr(VI) anions and MCB20 occurred due to the remarkable contribution of Fe3+ ions on the biochar surface after magnetization In this study, the MSS25’s.
• - Magnetic snail shell: suitable impregnation ratio of iron/corncob at 25% (w/w) (MSS25) for removal of Cr(VI) from aqueous solutions. The adsorption capacity of Cr(VI) reached its peak in acidic conditions at pH of 2–3. The physicochemical properties data indicated that CaCO₃ and Fe₃O₄ were distributed uniformly on the MSS25 surface. Our results demonstrated that the maximum adsorption capacity of Cr(VI) by MSS25 significantly increased after magnetization and the Langmuir maximum adsorption capacity of MSS25 was 46.08 mg Cr(VI)/g MSS25 at initial Cr(VI) concentration of 60 mg/L. The pseudo-secondorder model fitted the best to this study’s experimental data. Cr(VI) was adsorbed on MSS25 via ion exchange, electrostatic attraction, and adsorption-coupled reduction. The highly efficient removal of Cr(VI) by MSS25 was helped by large amounts of CaCO₃ and Fe₃O₄ on MSS25.

5. Products

02 SCI articles:

1. ,   ,   ,   ,   ,    and   (2019), “Removal of Cr(VI) from aqueous solution using magnetic modified biochar derived from raw corncob”, New J. Chem, 2019,43, 18663-18672, .
2. Le Phuong Hoang, Thi Minh Phuong Nguyen, Huu Tap Van, Thi Kim Dung Hoang, Xuan Hoa Vu, Tien Vinh Nguyen, N. X. Ca (2020), “Cr(VI) Removal from Aqueous Solution Using a Magnetite Snail Shell”, Water Air Soil Pollut (2020) 231: 28, https://doi.org/10.1007/s11270-020-4406-4.

6. Transfer alternatives, application institutions, impacts and benefits of research results

Impacts and benefits of science and technology and educational-training:

• Contribute to expanding knowledge about recycle of waste for waste treatment, especially knowledge on producing adsorbent from solid waste for wastewater treatment.
• Improve the scientific research ability of lecturers and students.
• Research is a reference for students and teachers specialized in environmental management and engineering, especially in the field of waste recovery, recycling, pollutant adsorption in wastewater.

Impacts and benefits of socio-economic:

• Minimizing the harmful effects causing due to Cr(VI) pollution in wastewater as well as reducing the disposal of solid waste into the environment.
• Helps recover some materials from solid waste.
• Create useful products from solid waste with low cost.