污泥基FeCa-ALE复合材料对磷酸盐的吸附机制

doi:10.16085/j.issn.1000-6613.2024-0557

化工进展 ›› 2025, Vol. 44 ›› Issue (4): 2365-2373.DOI: 10.16085/j.issn.1000-6613.2024-0557

污泥基FeCa-ALE复合材料对磷酸盐的吸附机制

王沛淦¹(), 李乐利², 谢颂专³, 宋冰冰¹, 孔巧平¹(), 刘改革³, 麻微微¹, 施雪卿¹

^1.青岛理工大学环境与市政工程学院，山东青岛 266520
^2.青岛日报报业集团, 山东青岛 266101
^3.临沂矿业集团菏泽煤电有限公司郭屯煤矿, 山东菏泽 274700

收稿日期:2024-04-03 修回日期:2024-08-31 出版日期:2025-04-25 发布日期:2025-05-07
通讯作者: 孔巧平
作者简介:王沛淦（2000—），男，硕士研究生，研究方向为环保功能材料研发与应用以及工业废水污染与控制。E-mail：wpeigan@163.com。
基金资助:
青岛西海岸新区科技计划科技惠民专项(2024-17);山东省自然科学基金青年基金(ZR2021QE272);山东省高等学校青创科技支持计划(2022KJ164)

Phosphate adsorption mechanism of sludge-based FeCa-ALE composite material

WANG Peigan¹(), LI Leli², XIE Songzhuan³, SONG Bingbing¹, KONG Qiaoping¹(), LIU Gaige³, MA Weiwei¹, SHI Xueqing¹

^1.School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, Shandong, China
^2.Qingdao Daily Newspaper Group, Qingdao 266101, Shandong, China
^3.Guotun Coal Mine of Linyi Mining Group Heze Coal and Electricity Co. Ltd. , Heze 274700, Shandong, China

Received:2024-04-03 Revised:2024-08-31 Online:2025-04-25 Published:2025-05-07
Contact: KONG Qiaoping

摘要/Abstract

摘要：

磷酸盐的过度排放会造成水体富营养化，对水环境安全构成极大威胁，而磷作为一种不可再生资源，具有重大的回收价值。为获得成本低廉、性能优异的吸附剂，有效回收废水中的磷酸盐，采用高温碳酸钠法从剩余污泥中提取类藻酸盐多聚物（alginate-like exopolymers，ALE），制备了FeCa-ALE水凝胶复合材料。利用扫描电子显微镜（SEM）、X射线光电子能谱（XPS）及傅里叶变换红外光谱（FTIR）等表征手段对FeCa-ALE微观形貌及官能团特性进行了分析。静态吸附实验表明，FeCa-ALE对磷酸盐表现出良好的吸附性能，且pH为9时的最大吸附量为15.92mg/g。拟二级动力学模型、Elovich动力学模型和Freundlich等温模型能很好地描述FeCa-ALE对磷酸盐的吸附过程，说明该吸附过程以非均相化学吸附为主。在实际水环境条件下的吸附性能测试表明，绿色环保、易生物降解的FeCa-ALE在一定程度上可抵抗盐度抑制效应，可用于实际废水中磷酸盐的去除。

关键词: 类藻酸盐多聚物, 磷酸盐, 吸附动力学, 吸附热力学, 吸附机理

Abstract:

Excessive discharge of phosphate will cause eutrophication of water body and pose a great threat to water environment safety. As a non-renewable resource, phosphate has significant recycling value. In order to obtain an adsorbent with low cost and excellent performance to effectively recover phosphate from wastewater, alginate-like exopolymers (ALE) was extracted from the residual sludge by high-temperature sodium carbonate method, and FeCa-ALE hydrogel composite was constructed. The microstructure and functional group characteristics of FeCa-ALE were analyzed by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). Static adsorption experiments showed that FeCa-ALE had good adsorption performance for phosphate, and the actual maximum adsorption capacity was 15.92mg/g at pH of 9. Pseudo-second-order kinetics, Elovich kinetic and Freundlich isotherm model could well describe the adsorption process of FeCa-ALE with respect to phosphate, indicating that the adsorption process was mainly dominated by heterogeneous chemical adsorption. The test of adsorption performance under the real water environment showed that FeCa-ALE with the characteristic of environmentally friendly and biodegradable, could resist the salinity inhibition effect to some extent and remove phosphate from real wastewater.

Key words: alginate-like exopolymers, phosphates, adsorption kinetics, adsorption thermodynamics, adsorption mechanism

中图分类号:

X703.1

王沛淦, 李乐利, 谢颂专, 宋冰冰, 孔巧平, 刘改革, 麻微微, 施雪卿. 污泥基FeCa-ALE复合材料对磷酸盐的吸附机制[J]. 化工进展, 2025, 44(4): 2365-2373.

WANG Peigan, LI Leli, XIE Songzhuan, SONG Bingbing, KONG Qiaoping, LIU Gaige, MA Weiwei, SHI Xueqing. Phosphate adsorption mechanism of sludge-based FeCa-ALE composite material[J]. Chemical Industry and Engineering Progress, 2025, 44(4): 2365-2373.

图/表 13

参考文献 17

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样品	C/%	O/%	Fe/%	Ca/%	Mg/%	P/%	N/%
ALE	79.97	9.57	—	—	—	1.93	8.53
FeCa-ALE	77.73	10.25	0.91	0.99	—	1.72	8.40
FeCa-ALE-P	77.02	10.42	0.74	0.85	—	2.41	8.56

样品	C/%	O/%	Fe/%	Ca/%	Mg/%	P/%	N/%
ALE	79.97	9.57	—	—	—	1.93	8.53
FeCa-ALE	77.73	10.25	0.91	0.99	—	1.72	8.40
FeCa-ALE-P	77.02	10.42	0.74	0.85	—	2.41	8.56

吸附剂	准一级动力学模型			准二级动力学模型			Elovich动力学模型
吸附剂	k₁/min^-1	R²		k₂/g‧(mg‧min)^-1	R²		α/mg·(g·min)^-1	β/g·mg^-1	R²
FeCa-ALE	0.0150	0.90		0.0013	0.93		1.2337	0.3747	0.94

吸附剂	准一级动力学模型			准二级动力学模型			Elovich动力学模型
吸附剂	k₁/min^-1	R²		k₂/g‧(mg‧min)^-1	R²		α/mg·(g·min)^-1	β/g·mg^-1	R²
FeCa-ALE	0.0150	0.90		0.0013	0.93		1.2337	0.3747	0.94

参数	数值
k_d1/mg·(g·min^0.5)^-1	0.7394
C₁/mg·g^-1	2.4299
R²	0.9772
k_d2/mg·(g·min^0.5)^-1	0.0726
C₂/mg·g^-1	13.0559
R²	0.8328
k_d3/mg·(g·min^0.5)^-1	0.0014
C₃/mg·g^-1	15.0348
R²	1

污泥基FeCa-ALE复合材料对磷酸盐的吸附机制

Phosphate adsorption mechanism of sludge-based FeCa-ALE composite material

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参考文献 17

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吸附等温模型	参数	数值
吸附等温模型	参数	25℃	30℃	35℃
Langmuir等温吸附模型	q_m/mg·g^-1	16.28	16.67	16.90
	K_L/L·mg^-1	0.0270	0.0300	0.0323
	R²	0.9718	0.9660	0.9640
Freundlich等温吸附模型	K_F/(mg·g^-1)·(mg·L^-1)^-1/ⁿ	1.8184	2.0996	2.3027
	1/n	0.3946	0.3745	0.3618
	R²	0.9866	0.9725	0.9764
Temkin等温吸附模型	A/mg^1-ⁿ ·L ⁿ ·g^-1	0.3698	0.4090	0.4523
	B	3.1803	3.2545	3.2708
	R²	0.9803	0.9736	0.9764

吸附剂	最大吸附量/mg·g^-1	实验条件			参考文献
吸附剂	最大吸附量/mg·g^-1	溶液pH	温度/℃	吸附剂投加量/g·L^-1	参考文献
污泥生物炭（SDBC）	0.58	5	25	8.0	[13]
复合珊瑚结构材料	9.44	8	25	1.0	[14]
锆-海藻酸盐复合微球（Zr@AlgBent）	30.25	4	30	2.0	[15]
La基生物炭（La-BC）	60.11	3	45	2.0	[16]
FeCa-ALE	16.28	9	25	0.5	本文

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