富Mn鸢尾生物炭的制备及在类Fenton体系中的应用

doi:10.7503/cjcu20190324

高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (12): 2598.doi: 10.7503/cjcu20190324

富Mn鸢尾生物炭的制备及在类Fenton体系中的应用

牛慧斌¹,顾彦²,张常安^1,²,黄应平^1,²,方艳芬^1,^2,^*()

^1. 三峡大学生物与制药学院
^2. 三峡库区生态环境教育部工程研究中心, 宜昌 443002

收稿日期:2019-06-10 出版日期:2019-12-04 发布日期:2019-12-04
通讯作者: 方艳芬 E-mail:chem_ctgu@126.com
基金资助:
国家自然科学基金(21677086);国家自然科学基金(21972073);国家自然科学基金(21577078);湖北省对外科学合作项目(2018AHB020);湖北省创新群体滚动项目(2015CFA021);三峡大学材料分析检测中心项目资助.

Preparation of Biochar with Mn Enriched in Iris and Its Application in Fenton-like System ^†

Huibin NIU¹,Yan GU²,Changan ZHANG^1,²,Yingping HUANG^1,²,Yanfen FANG^1,^2,^*()

^1. College of Biological and Pharmaceutical Sciences
^2. Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, China Three Gorges University, Yichang 443002, China

Received:2019-06-10 Online:2019-12-04 Published:2019-12-04
Contact: Yanfen FANG E-mail:chem_ctgu@126.com
Supported by:
? Supported by the National Natural Science Foundation of China(21677086);the National Natural Science Foundation of China(21972073);the National Natural Science Foundation of China(21577078);the Hubei Province Foreign Science and Technology Cooperation Project, China(2018AHB020);the Natural Science Foundation for Innovation Group of Hubei Province, China(2015CFA021);the Foundation of Materials Analysis and Testing Center of China Three Gorges University.

摘要/Abstract

摘要：

通过在N₂气氛围下热裂解富集Mn的鸢尾可得到Mn/生物炭(BC)材料, 并按植物叶(Leaf)和根部(Root)分别将其分别命名为BC-L0, BC-L1, BC-L2, BC-R0, BC-R1和BC-R2. 采用扫描电子显微镜(SEM)、能谱分析(EDS)仪、 X射线衍射(XRD)仪、 X射线光电子能谱(XPS)、傅里叶变换红外光谱(FTIR)、原子吸收光谱(AAS)和比表面积分析(BET)仪等对Mn/生物炭材料的Mn含量、化学组成与形貌进行了表征, 发现鸢尾叶部为Mn主要富集部位, 最大富集量为13.0 mg/g, 且Mn以Mn₂O₃薄片存在于生物炭表面. 利用Mn/生物炭与H₂O₂构建了类Fenton体系, 在中性条件下BC-L2-H₂O₂体系对有机污染物罗丹明B(RhB, 3×10 ^-5 mol/L)的降解率达到50%(180 min), 表明该体系具备氧化去除RhB的能力, 并推测了该体系对RhB的催化氧化机理. 结果表明, 先将Mn超富集植物转化为Mn/生物炭材料, 再通过添加H₂O₂能构建具有氧化能力的类Fenton体系, 可用于对有机污染物的降解, 实现“以废治废”的绿色循环思路, 为Mn富集的植物后续处理提供一种新的转化及应用方式.

关键词: 锰污染, 类Fenton体系, 生物炭, 超富集植物, 以废治废

Abstract:

Mn enriched Brazilian iris(Neomarica gracilis) was converted into biochar and its potential application was studied, which provided a new transformation and application method for manganese enriched plant subsequent treatment. The Mn/biochar materials were obtained by pyrolysis of the Mn-rich Brazilian iris in a N₂ atmosphere, and named them as BC-L0, BC-L1, BC-L2, BC-R0, BC-R1 and BC-R2 according to the leaf and root, respectively. SEM/EDS, XRD, XPS, AAS and specific surface area analyzer(S_BET) were employed to characterize the morphology, chemical composition of Mn doped on biochar surface. The results showed that the leaf part of the iris was the main enrichment part of Mn, and the maximum Mn enrichment concentration was 13.0 mg/g. Mn₂O₃ flakes was present on the surface of biochar samples When H₂O₂ was added, the Fenton-like system could be successfully constructed. At 180 min, the degradation rate of RhB(3×10 ^-5 mol/L) in BC-L2/H₂O₂ system reached 50%, indicating that the system can be used to remove organic dyes. Furthermore, the possible catalytic oxidation mechanism of RhB in BC-L2/H₂O₂ system was proposed. The results of this study showed that by converting Mn-enriched plant into Mn/biochar material under suitable thermal cracking conditions, which helped to construct Fenton-like system and degrade toxic organic pollutants. This study provided the green approaching for treatment of cyclic waste treatment.

Key words: Mn pollution, Fenton-like system, Biochar, Super-enriched plant, Waste treatment by waste

中图分类号:

O643

TrendMD:

牛慧斌,顾彦,张常安,黄应平,方艳芬. 富Mn鸢尾生物炭的制备及在类Fenton体系中的应用. 高等学校化学学报, 2019, 40(12): 2598.

Huibin NIU,Yan GU,Changan ZHANG,Yingping HUANG,Yanfen FANG. Preparation of Biochar with Mn Enriched in Iris and Its Application in Fenton-like System ^†. Chem. J. Chinese Universities, 2019, 40(12): 2598.

图/表 5

Table 1 Specific surface area(SBET) and Mn content of biochar samples

Sample	BC-L0	BC-L1	BC-L2	BC-R0	BC-R1	BC-R2
S_BET /(m²·g^-1)	103.51	58.29	76.31	11.26	8.73	10.31
Mn content/(mg·g^-1)	2.7	8.8	13.0	0.06	3.6	3.5

Fig.1 SEM images of biochar samples (A) BC-L0; (B) BC-L1; (C) BC-L2; (D) BC-R0; (E) BC-R1; (F) BC-R2.

Fig.2 XRD patterns of samples(A) , XPS survey(B) and Mn2p(C) spectra of BC-L2 and FTIR(D) spectra of samples a. BC-L0; b. BC-L1; c. BC-L2.

Fig.3 Degradation kinetics of RhB(A) and ·OH generation(B) under different systems Dosage=5.0 mg; [RhB]=3×10-5 mol/L; [H2O2]=6×10-2 mol/L; pH=6.13±0.5; V=40 mL.

Fig.4 Proposed degradation pathways of RhB on BC-L2 surface

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富Mn鸢尾生物炭的制备及在类Fenton体系中的应用

Preparation of Biochar with Mn Enriched in Iris and Its Application in Fenton-like System ^†

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富Mn鸢尾生物炭的制备及在类Fenton体系中的应用

Preparation of Biochar with Mn Enriched in Iris and Its Application in Fenton-like System †

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Preparation of Biochar with Mn Enriched in Iris and Its Application in Fenton-like System ^†