磷酸三丁酯脱色活性炭热解再生研究

doi:10.19964/j.issn.1006-4990.2023-0099

Abstract

Abstract:

The effect of regeneration temperature，regeneration time，and regeneration frequency on the regeneration efficiency of waste activated carbon（WAC） was studied by high-temperature pyrolysis method，using methylene blue adsorption amount and iodine value as evaluation indicators，using powdered activated carbon（WAC） decolorized with tributyl phosphate（TBP） as the materials.The experimental results showed that the optimal regeneration condition of activated carbon was 500 ℃ for 90 min.After the fourth regeneration，the adsorption properties of 82% methylene blue and 67% iodine could be recovered.The weight loss，heat absorption and heat release of activated carbon during pyrolysis were analyzed by TG-DSC，and the activated carbon before and after regeneration were characterized by the specific surface area and aperture analyzer，FT-IR，SEM and other testing methods to verify its regeneration effect.This research gave a comprehensive analysis of the pyrolysis mechanism of spent activated carbon，which provided theoretical guidance for the pyrolysis regeneration of decolorized activated carbon from TBP in a wet phosphoric acid purification process.

Key words: wet-process phosphoric acid, TBP, waste activated carbon, thermal regeneration

CLC Number:

TQ424.1

ZHANG Ying, LI Jun, JIN Yang, HUANG Meiying. Study on pyrolysis regeneration of activated carbon for Tributyl phosphate decolorization[J]. Inorganic Chemicals Industry, 2024, 56(1): 59-66.

Figures/Tables 9

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Table 1

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样品名称	亚甲基蓝质量浓度/（mg∙L^-1）	q_exp/ （mg∙g^-1）	拟一级动力学模型			拟二级动力学模型
样品名称	亚甲基蓝质量浓度/（mg∙L^-1）	q_exp/ （mg∙g^-1）	q_e/（mg∙g^-1）	k₁/min^-1	R²	q_e/（mg∙g^-1）	k₂/（g∙mg^-1∙min^-1）	R²
PAC	100	49.89	49.785	0.164	0.952	49.90	0.211	0.999
	200	99.74	99.462	0.074	0.645	99.90	0.034	0.999
	300	149.71	149.66	0.032	0.839	150.83	0.005	0.999
	400	199.58	202.51	0.008	0.376	216.92	0.001	0.928
	500	249.39	245.21	0.046	0.720	253.81	0.001	0.999
RAC-500-90	100	49.78	48.61	0.167	0.492	49.88	0.021	0.999
	200	99.66	97.36	0.030	0.995	100.40	0.005	0.999
	300	149.04	136.78	0.041	0.889	151.75	0.002	0.999
	400	198.15	187.05	0.036	0.954	204.08	0.001	0.997
	500	244.11	231.01	0.027	0.989	255.75	0.002	0.998

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Study on pyrolysis regeneration of activated carbon for Tributyl phosphate decolorization

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