生物质基活性炭对环丙沙星的吸附性能研究

doi:10.3969/j.issn.0253-2417.2020.04.010

摘要/Abstract

摘要：

以玉米芯为原料制备生物质基活性炭，研究其对环丙沙星（CIP）的吸附性能。采用响应面分析法Box-Behnken design模型对吸附条件进行优化，得到最佳吸附工艺条件：吸附时间537 min，吸附剂用量0.46 g/L，pH值为4.92。吸附实验结果表明：活性炭对环丙沙星的吸附能力随着温度的升高而增大，吸附过程符合Redlich-Peterson和Sips等温吸附模型；热力学参数表明活性炭对环丙沙星的吸附是自发进行的、吸热的、熵增的吸附过程；Elovich吸附动力学模型能够更好地描述活性炭对环丙沙星的吸附动力学行为；298 K时，活性炭吸附环丙沙星的最大饱和吸附量为238.01 mg/g，表明生物质基活性炭对废水中的环丙沙星有较好的吸附效果。

关键词: 活性炭, 玉米芯, 环丙沙星, 响应面法, 吸附

Abstract:

The activated carbon derived biomass waste corncob was investigated for the adsorption of antibiotic ciprofloxacin(CIP) from aqueous solution.The Box-Behnken design(BBD) of response surface methodology was used to optimize the operating conditions, the optimum adsorption conditions were found to be adsorption time of 537 min, adsorbent dosage of 0.46 g/L and pH 4.92. The results showed that the equilibrium adsorption amount of ciprofloxacin increased with the increase of temperature, and the adsorption equilibrium data were found to fit the Redlich-Peterson model and Sips model well. The thermodynamic parameters revealed the adsorption process of CIP on activated carbon was a spontaneous, endothermic and increasing entropy process.The Elovich model could perfectly describe the adsorption process of ciprofloxacin on activated carbon.At 298 K, the maximum adsorption capacity of ciprofloxacin was 238.01 mg/g, indicating that the corncob-based activated carbon was a promising adsorbent for the removal of ciprofloxacin from aqueous solution.

Key words: activated carbon, corncob, ciprofloxacin, response surface methodology, adsorption

中图分类号:

TQ35

张婷婷,韩秀丽,刘莹,董春玲,常春. 生物质基活性炭对环丙沙星的吸附性能研究[J]. 林产化学与工业, 2020, 40(4): 71-78.

Tingting ZHANG,Xiuli HAN,Ying LIU,Chunling DONG,Chun CHANG. Adsorption Characteristics of Ciprofloxacin by Biomass-based Activated Carbon[J]. Chemistry and Industry of Forest Products, 2020, 40(4): 71-78.

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参考文献 15

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编号 No.	X₁ 吸附时间/min adsorption time	X₂ 吸附剂用量/(g·L^-1) adsorbent dosage	X₃ pH值 pH value	吸附量(q_t)/(mg·g^-1) adsorption capacity
1	-1(120)	-1(0.4)	0(5.5)	114.23
2	+1(600)	-1(0.4)	0(5.5)	153.42
3	-1(120)	+1(0.6)	0(5.5)	110.05
4	+1(600)	+1(0.6)	0(5.5)	144.80
5	-1(120)	0(0.5)	-1(3)	118.24
6	+1(600)	0(0.5)	-1(3)	145.81
7	-1(120)	0(0.5)	+1(8)	106.22
8	+1(600)	0(0.5)	+1(8)	145.24
9	0(360)	-1(0.4)	-1(3)	145.9
10	0(360)	+1(0.6)	-1(3)	138.42
11	0(360)	-1(0.4)	+1(8)	131.67
12	0(360)	+1(0.6)	+1(8)	127.77
13	0(360)	0(0.5)	0(5.5)	148.14
14	0(360)	0(0.5)	0(5.5)	146.66
15	0(360)	0(0.5)	0(5.5)	146.12
16	0(360)	0(0.5)	0(5.5)	148.42
17	0(360)	0(0.5)	0(5.5)	145.78

方差来源 sources	平方和 sum of squares	自由度 df	均方差 mean square	F值 F value	P值 P value	显著性 significant
模型model	3682.81	9	409.20	90.71	< 0.0001	**
X₁	2468.59	1	2468.59	547.24	< 0.0001	**
X₂	73.08	1	73.08	16.20	0.0050	*
X₃	175.50	1	175.50	38.91	0.0004	**
X₁X₂	4.93	1	4.93	1.09	0.3307
X₁X₃	32.78	1	32.78	7.27	0.0308	*
X₂X₃	3.20	1	3.20	0.71	0.4272
X₁²	579.41	1	579.41	128.44	< 0.0001	**
X₂²	91.76	1	91.76	20.34	0.0028	*
X₃²	173.31	1	173.31	38.42	0.0004	**
残差residual	31.58	7	4.51
失拟项lack of fit	25.89	3	8.63	6.06	0.0571
纯误差pure error	5.69	4	1.42
总和sum	3714.39	16

模型model	参数parameter	298 K	308 K	318 K
朗谬尔 Langmuir	q_m/(mg·g^-1)	187.05	209.93	230.05
	K_L/(L·mg^-1)	0.3838	1.2541	1.5460
	R²	0.8926	0.8618	0.8474
	χ²	7.9408	13.6173	21.3988
弗罗因德利希 Freundlich	K_F/(mg·g^-1·(L·mg^-1)^1/n)	93.43	119.06	129.88
	1/n	0.1392	0.1220	0.1255
	R²	0.9616	0.9535	0.9602
	χ²	4.0140	7.2644	8.4017
雷德利希-彼得松 Redlich-Peterson	A/(L·g^-1)	179.38	625.79	963.55
	B	1.5240	4.3665	6.2555
	g	0.9056	0.9159	0.9098
	R²	0.9983	0.9934	0.9974
	χ²	0.1208	0.7573	0.3654
Sips模型 Sips model	q_ms/(mg·g^-1)	238.01	269.23	299.51
	K_s/(L·mg^-1)	0.1753	0.4066	0.4103
	m	0.4092	0.3568	0.3498
	R²	0.9905	0.9842	0.9903
	χ²	0.6995	1.9880	1.5718

模型model		298 K	308 K	318 K
准一级动力学 pseudo first-order kinetics	k₁/min^-1	0.0531	0.0678	0.0733
	q_cal/(mg·g^-1)	142.43	164.40	179.85
	R²	0.7017	0.6942	0.6960
准二级动力学 pseudo second-order kinetics	k₂×10⁴/(g·mg^-1·min^-1)	5.6134	6.2679	6.3000
	q_exp/(mg·g^-1)	154.92	178.19	193.68
	q_cal/(mg·g^-1)	150.03	172.28	188.01
	R²	0.8800	0.8882	0.8966
叶洛维奇方程 Elovich	α/(mg·g^-1·min^-1)	32.9422	49.0526	58.9315
	β/(g·mg^-1)	0.0515	0.0484	0.0460
	R²	0.9962	0.9976	0.9951
颗粒内扩散模型 intraparticle diffusion model	$ {k_{{\rm{t}}1}}{\rm{/(mg}} \cdot {{\rm{g}}^{ - 1}} \cdot {\min ^{ - \frac{1}{2}}})$	8.7392	10.1206	10.7331
	C₁	48.08	61.76	71.34
	R	0.9940	0.9678	0.9472
	$ {k_{{\rm{t}}2}}{\rm{/(mg}} \cdot {{\rm{g}}^{ - 1}} \cdot {\min ^{ - \frac{1}{2}}})$	2.8622	2.9697	3.0232
	C₂	93.96	115.23	130.43
	R	0.9879	0.9915	0.9685
	$ {k_{{\rm{t}}3}}{\rm{/(mg}} \cdot {{\rm{g}}^{ - 1}} \cdot {\min ^{ - \frac{1}{2}}})$	1.0633	1.1449	1.3306
	C₃	129.93	151.50	162.67
	R	0.9544	0.9562	0.9974

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