Adsorption of ciprofloxacin hydrochloride by biochar from food waste digestate residues

doi:10.16085/j.issn.1000-6613.2022-1152

Abstract

Abstract:

The biochars were prepared by pyrolysis of food waste digestate residues at five temperatures (400℃, 500℃, 600℃, 700℃ and 800℃), and their morphological characteristics, pore structures and surface functional groups were analyzed to investigate the effect of adsorption of ciprofloxacin hydrochloride (CIP) in aqueous solution. The results showed that the biochar prepared by pyrolysis at 700℃ (DR-700) became loose and porous with rich surface functional groups, better pore structure and microstructure. DR-700 had the best adsorption effect on CIP among the five biochars and could reach 95.09% removal of CIP, which could be used as a good adsorption material. The adsorption of CIP on DR-700 was more in line with the pseudo-first-order kinetic and Freundlich isotherm models, which indicated that physical adsorption might be the main mechanism of CIP adsorption on DR-700, and was more attributed to the rich surface area. In contrast, the simultaneous chemisorption might be due to cation exchange interactions, electrostatic interactions, π-π interactions, hydrophobic and hydrogen bonding interactions. Therefore, the use of biochar prepared by food waste digestate residues had a good adsorption and purification effect on CIP in aqueous solution, which not only provided a new material for the low-cost treatment of antibiotic wastewater, but also provided a new solution to solve the problem of resource utilization of anaerobic fermentation end products of food waste, and had good application potential.

Key words: food waste digestate residues, biochar, adsorption, ciprofloxacin hydrochloride, removal mechanism

摘要：

将餐厨厌氧沼渣在5种温度（400℃、500℃、600℃、700℃和800℃）下热解制备生物炭，解析其形貌特征、孔隙结构以及表面官能团等变化规律，探究其对水溶液中的盐酸环丙沙星（CIP）吸附效果，并通过吸附动力学和等温吸附特性探究其吸附机制。结果表明，在700℃下热解制备的生物炭（DR-700）疏松多孔，表面官能团丰富且具有更好的孔隙结构和微观结构，在所有生物炭中对于CIP的吸附效果最好。吸附去除率可达95.09%，可用作良好的吸附材料。DR-700对于CIP的吸附更符合伪一阶动力学和Freundlich等温线模型，表明物理吸附可能是CIP在DR-700吸附的主要机制，主要归功于丰富的比表面积。而同时存在的化学吸附则可能是由于阳离子交换相互作用、静电相互作用、π-π相互作用、疏水和氢键共同作用。因此，利用餐厨厌氧沼渣热解制备生物炭对水溶液中的CIP具有良好的吸附净化效果，这不但可以为抗生素废水低成本处理提供新的材料，还为解决餐厨垃圾厌氧发酵末端产物的资源化利用问题提供一种新方案，具有良好的应用潜力。

关键词: 餐厨厌氧沼渣, 生物炭, 吸附, 盐酸环丙沙星, 去除机制

CLC Number:

X703

WANG Yu, YU Guangwei, JIANG Ruqing, LI Changjiang, LIN Jiajia, XING Zhenjiao. Adsorption of ciprofloxacin hydrochloride by biochar from food waste digestate residues[J]. Chemical Industry and Engineering Progress, 2023, 42(4): 2160-2170.

王玉, 余广炜, 江汝清, 黎长江, 林佳佳, 邢贞娇. 餐厨厌氧沼渣生物炭吸附盐酸环丙沙星[J]. 化工进展, 2023, 42(4): 2160-2170.

Figures/Tables 16

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沼渣生物炭	热解产率/%	工业分析（质量分数）/%			元素分析（质量分数）/%					H/C	N/C
沼渣生物炭	热解产率/%	灰分	挥发分	固定碳	N	C	H	S	O	H/C	N/C
DR	—	48.05	49.41	2.54	3.49	22.72	3.22	0.39	22.13	1.70	0.13
DR-400	65.97	69.34	26.42	4.25	1.20	13.01	1.30	0.41	14.75	1.20	0.08
DR-500	64.97	70.27	22.62	7.11	1.27	13.85	1.25	0.51	12.85	1.08	0.08
DR-600	62.27	71.86	19.45	8.69	0.91	13.28	0.89	0.52	12.55	0.80	0.06
DR-700	52.23	81.71	16.00	2.29	0.34	8.22	1.09	0.65	8.00	1.59	0.04
DR-800	51.57	84.03	13.48	2.49	0.26	7.71	1.17	0.52	6.31	1.82	0.03

沼渣生物炭	热解产率/%	工业分析（质量分数）/%			元素分析（质量分数）/%					H/C	N/C
沼渣生物炭	热解产率/%	灰分	挥发分	固定碳	N	C	H	S	O	H/C	N/C
DR	—	48.05	49.41	2.54	3.49	22.72	3.22	0.39	22.13	1.70	0.13
DR-400	65.97	69.34	26.42	4.25	1.20	13.01	1.30	0.41	14.75	1.20	0.08
DR-500	64.97	70.27	22.62	7.11	1.27	13.85	1.25	0.51	12.85	1.08	0.08
DR-600	62.27	71.86	19.45	8.69	0.91	13.28	0.89	0.52	12.55	0.80	0.06
DR-700	52.23	81.71	16.00	2.29	0.34	8.22	1.09	0.65	8.00	1.59	0.04
DR-800	51.57	84.03	13.48	2.49	0.26	7.71	1.17	0.52	6.31	1.82	0.03

温度/℃	Freundlich方程			Langmuir方程
温度/℃	K_F	1/n	R²	K_L	Q_max/mg·g^-1	R²
25	8.95	0.3497	0.9904	0.4901	24.57	0.9286
35	10.39	0.3199	0.9630	0.8286	24.17	0.9607
45	10.20	0.3221	0.9604	0.4530	33.46	0.9752

温度/℃	Freundlich方程			Langmuir方程
温度/℃	K_F	1/n	R²	K_L	Q_max/mg·g^-1	R²
25	8.95	0.3497	0.9904	0.4901	24.57	0.9286
35	10.39	0.3199	0.9630	0.8286	24.17	0.9607
45	10.20	0.3221	0.9604	0.4530	33.46	0.9752

生物炭	实际吸附量/mg·g^-1	伪一级动力学方程			伪二级动力学方程
生物炭	实际吸附量/mg·g^-1	k₁/min^-1	q_e/mg·g^-1	R²	k₂/g·(mg·min)^-1	Q_e/mg·g^-1	R²
DR700	11.15	0.066	11.28	0.9912	0.0083	11.92	0.9891