Adsorption of methylene blue by biochar prepared using straw mixed with agricultural film

doi:10.19965/j.cnki.iwt.2024-0168

Abstract

Abstract:

In order to explore the effect of agricultural film doping on the structure and adsorption properties of straw biochar materials, the graphitized biochar of SPS600-B was prepared using waste corn straw mixed with polyethylene agricultural film as raw materials and anhydrous potassium carbonate as modifier. The material was characterized by SEM, TEM, BET, XRD and elemental analysis. The adsorption performance and mechanism for methylene blue(MB) by SPS600-B were investigated. The results showed that SPS600-B was highly graphitized with many non-penetrating pore and carbon microsphere structures on its surface, and the specific surface area was 821.96 m²/g. At 25 ℃ and pH=7, the removal rate of 100 mg/L MB by 0.2 g/L SPS600-B reached 93.2%, and the adsorption capacity was 466.2 mg/g. After 5 cycles of adsorption-desorption recycling, the removal rate of MB could still reach 79.4%. The adsorption mechanism revealed that the adsorption process conformed to the quasi-second-order kinetic model and Langmuir model, which was dominated by chemisorption. The adsorption process was affected by pore adsorption, electrostatic attraction, π-π electron interaction and hydrogen bonding. The adsorption behaviour was a spontaneous adsorption reaction.

Key words: straw, agricultural film, biochar, methylene blue, adsorption

摘要：

为了研究农膜掺杂对秸秆生物质炭材料结构和吸附性能的影响，以聚乙烯农膜和玉米秸秆为原料，无水碳酸钾为改性剂，制备了石墨化生物质炭SPS600-B，通过SEM、TEM、BET、XRD、元素分析等对材料进行了表征，考察了其吸附亚甲基蓝（MB）的性能和机理。研究结果表明SPS600-B高度石墨化，表面具有很多不穿透介孔以及碳微球结构，比表面积达到了821.96 m²/g。在25 ℃、pH=7时，0.2 g/L SPS600-B对100 mg/L MB的去除率为93.2%，吸附容量为466.2 mg/g，经过5次解吸附循环利用，去除率仍可达79.4%。吸附机理研究表明：吸附过程符合准二级动力学模型和Langmuir模型，以化学吸附为主。吸附过程受到包括孔吸附作用、π-π电子作用、静电引力作用和氢键作用等的共同影响，吸附行为属于自发的吸热反应。

关键词: 农膜, 秸秆, 生物质炭, 亚甲基蓝, 吸附

CLC Number:

X703

Qingyuan WANG, Yanping ZHANG, Yibing LI, Fen LI. Adsorption of methylene blue by biochar prepared using straw mixed with agricultural film[J]. Industrial Water Treatment, 2025, 45(3): 110-120.

王庆元, 张彦平, 李一兵, 李芬. 农膜-秸秆生物质炭对亚甲基蓝的吸附性能[J]. 工业水处理, 2025, 45(3): 110-120.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2024-0168

https://www.iwt.cn/EN/Y2025/V45/I3/110

Figures/Tables 17

References 32

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样品	比表面积/（m²·g^-1）	总孔容/（cm³·g^-1）	平均孔径/nm
SPS600	9.72	0.048 8	17.441 5
SPS600-B	821.96	0.202 4	6.306 7

样品	比表面积/（m²·g^-1）	总孔容/（cm³·g^-1）	平均孔径/nm
SPS600	9.72	0.048 8	17.441 5
SPS600-B	821.96	0.202 4	6.306 7

样品	C/%	H/%	N/%	O/%	H/C	O/C	（O+N）/C
SPS600	37.84	1.82	0.28	55.51	0.049	1.46	1.47
SPS600-B	48.78	2.21	0.11	44.9	0.045	0.92	0.92

样品	C/%	H/%	N/%	O/%	H/C	O/C	（O+N）/C
SPS600	37.84	1.82	0.28	55.51	0.049	1.46	1.47
SPS600-B	48.78	2.21	0.11	44.9	0.045	0.92	0.92

准一级反应动力学模型			准二级反应动力学模型			颗粒内扩散模型
q _e/（mg·g^-1）	k ₁	R ²	q _e/（mg·g^-1）	k ₂	R ²	K _d1	C ₁	R ²	K _d2	C ₂	R ²	K _d3	C ₃	R ²
429.82	0.025 3	0.937	454.32	0.002 1	0.997	67.45	13.92	0.982	15.47	298.59	0.936	1.75	443.57	0.909

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