Effects and Mechanisms of Methyl Orange Removal from Aqueous Solutions by Modified Rice Shell Biochar

Waste rice shell (RS) was used for modified biochar preparation via different activation methods. The types of modifiers, impregnation ratio, and pyrolysis temperature have significant effects on the characteristics of biochar and the adsorption capacity of methyl orange (MO). The physical and chemi...

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Bibliographic Details
Published inHuanjing kexue Vol. 40; no. 6; p. 2783
Main Authors Shi, Yue-Yue, Shan, Riu, Yuan, Hao-Ran
Format Journal Article
LanguageChinese
Published China 08.06.2019
Subjects
modified
adsorption
methyl orange (MO)
zinc chloride
rice husk biochar
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Summary:Waste rice shell (RS) was used for modified biochar preparation via different activation methods. The types of modifiers, impregnation ratio, and pyrolysis temperature have significant effects on the characteristics of biochar and the adsorption capacity of methyl orange (MO). The physical and chemical properties of modified biochar and MO adsorption mechanisms were analyzed by N -adsorption, X-ray diffraction (XRD), Fourier infrared spectroscopy (FT-IR), field emission scanning electron microscopy (SEM), thermogravimetric analyzer (TG), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) techniques. The results showed that the modified biochar (named Z2RT400) prepared at 400℃ with a mass ratio of 2:1 (ZnCl :rice shell) had the highest adsorption capacity for MO. Under the following conditions with a solution pH value of 4, adsorbent dosage of 10 mg, initial MO concentration of 2000 mg·L , and reaction time of 420 min, the maximum adsorption capacity of Z2RT400 was 1967.72 mg·g
ISSN:0250-3301
DOI:10.13227/j.hjkx.201811227