污泥生物炭/凹凸棒土的制备及其吸附性能研究

doi:10.19964/j.issn.1006-4990.2022-0435

Abstract

Abstract:

Sludge biochar/attapulgite（SBC/ATP） was prepared by slow co-pyrolysis of attapulgite（ATP） and sewage sludge（SS），and the adsorption performance of methylene blue（MB） was studied.The micromorphology and physicochemical properties of sludge biochar and its composites were analyzed by scanning electron microscopy，X-ray diffraction spectroscopy，infrared spectroscopy，X-ray photoelectron spectroscopy.The effects of pyrolysis temperature and raw material ratio on the adsorption properties of sludge biochar/attapulgite were investigated，and the effects of adsorbent dosage，pH，initial concentration and adsorption time on MB removal rate were investigated.The experimental results showed that the maximum adsorption capacity of SBC/ATP_（50%） prepared at 500 ℃ was 53.74 mg/g when the dosage was 1.2 g/L，pH was 11，the initial concentration of MB solution was 100 mg/L，and the adsorption time was 180 min.The adsorption of MB by SBC/ATP_（50%） was more in line with Langmuir isotherm model and quasi second-order kinetic model，indicating that the adsorption process was mainly monolayer adsorption controlled by chemical adsorption.

Key words: attapulgite, sludge biochar, compound material, methylene blue, adsorbent

CLC Number:

O643

GAO Fei, DONG Liangfei, GE Yulong, TANG Yuanyuan, LI Fen. Study on preparation of sludge biochar/attapulgite and its adsorption properties[J]. Inorganic Chemicals Industry, 2023, 55(5): 91-99.

Figures/Tables 16

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样品	Langmuir等温线模型			Freundlich等温线模型
样品	K_L	Q_m	R²	K_F	n	R²
SBC	0.243 0	21.852 3	0.991 5	9.862 6	0.520 9	0.931 8
SBC/ATP_（20%）	0.113 2	45.743 0	0.996 0	11.282 8	0.675 7	0.935 9
SBC/ATP_（50%）	0.141 3	53.735 8	0.994 8	13.029 8	0.895 1	0.936 2
SBC/ATP_（80%）	0.722 3	13.050 7	0.992 1	6.694 7	0.561 3	0.949 3

样品	准一级动力学			准二级动力学			颗粒内扩散
样品	Q_e	K₁	R²	Q_e	K₂	R²	K_i1	C₁	R₁²	K_i2	C₂	R₂²	K_i3	C₃	R₃²
SBC	1.389 7	0.034 8	0.985 9	0.118 6	0.065 2	0.999 7	1.630 4	6.189 8	0.988 6	0.858 9	9.341 6	0.984 6	0.053 4	14.741 6	0.987 8
SBC/ATP_（20%）	0.901 1	0.019 1	0.930 7	0.076 9	0.074 1	0.999 8	1.697 3	8.217 8	0.981 1	1.127 5	10.183 7	0.978 3	0.057 5	16.183 7	0.981 7
SBC/ATP_（50%）	1.175 8	0.022 5	0.957 8	0.080 7	0.078 7	0.999 8	2.611 2	9.415 7	0.987 1	1.285 6	12.842 6	0.975 0	0.050 1	19.842 6	0.985 6
SBC/ATP_（80%）	0.806 1	0.018 9	0.915 6	0.136 8	0.085 3	0.999 7	1.305 6	6.109 5	0.987 4	0.522 9	8.555 2	0.982 1	0.059 3	11.555 2	0.984 3

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Study on preparation of sludge biochar/attapulgite and its adsorption properties

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