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29 April 2022 Study on the adsorptive property of HNO3-modified almond shell biochar for methylene blue
Baochuan Qi, Dan Feng, Jiangwei Shang, Weihong Chen
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Proceedings Volume 12255, 2022 International Conference on Optoelectronic Information and Functional Materials (OIFM 2022); 122551I (2022) https://doi.org/10.1117/12.2638742
Event: 2022 International Conference on Optoelectronic Information and Functional Materials (OIFM 2022), 2022, Chongqing, China
Abstract
To enhance the adsorption and removal performance of the biochar, a late-model HNO3 modified almond shell biochar for methylene blue (MB) removal was prepared. The biochar before and after modification was characterized by BET, SEM, FTIR, and XRD, and the adsorption properties of MASB for MB were studied by adsorption kinetics and isothermal adsorption experiments. The results showed that the specific surface, pore-volume, and oxygen-containing functional groups increased after nitric acid modification. Orthogonal experimental results have shown that the optimal MASB was prepared under HNO3 concentration of 0.02mol/L, the ratio of solid to liquid of 1:30 and modification time of 2h, with a BET surface area of 262.47m2 /g; under the conditions of 25°C, initial MB mass concentration of 50mg/L, initial pH of 10 and MASB dosage of 4g/L, the theoretical maximum adsorption capacity of MB sorption onto MASB was 72.62mg/g; The obtained results showed that the adsorption of MB by MASB followed the pseudo-second-order kinetic and Langmuir adsorption isotherm model.
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Baochuan Qi, Dan Feng, Jiangwei Shang, and Weihong Chen "Study on the adsorptive property of HNO3-modified almond shell biochar for methylene blue", Proc. SPIE 12255, 2022 International Conference on Optoelectronic Information and Functional Materials (OIFM 2022), 122551I (29 April 2022); https://doi.org/10.1117/12.2638742
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KEYWORDS
Adsorption
Diffusion
FT-IR spectroscopy
Solids
Liquids
Oxidation
Scanning electron microscopy
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