SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chengfang Zhang,Zhenyu Song,Chao Li,Qinglong Liu,Jingchun Tang
In the actual polluted environment, the composite pollution system was usually composed of heavy metals and organic pollutants, especially Cr(VI) and chlorophenols often co-existed in industrial wastewater. In this study, a composite material consisting of multilayer graphene carbon shells coated with nZVI (gBC@nZVI) with various excellent properties was applied to deal with the composite system of Cr(VI) and 2,4-dichlorophenol (2,4-DCP) coexisting in the wastewater, and the intrinsic mechanism for the simultaneous removal of heavy metals and organic pollutants was systematically investigated. The results showed that in the composite pollution system (Cr(VI) = 20 mg/L, 2,4-DCP = 15 mg/L), complete removal of Cr(VI) could be achieved in 60 min, while 2,4-DCP achieved 95.2 % removal, with the contribution of oxidative degradation being 76.4 %. It was found that during the efficient adsorption and reduction of Cr(VI) by gBC@nZVI, the generation of the metastable intermediate Cr(V) was verified by probe compounds, electron spin resonance and UV–visible spectroscopy, and further experiments demonstrated that the generation of •OH was closely related to Cr(V) and promoted the oxidative degradation of the coexisting 2,4-DCP. Quenching experiments with the addition of specific scavengers indicated that •OH was the active species directly dominating the oxidative degradation of 2,4-DCP, whereas Cr(V) was indirectly involved in the degradation of 2,4-DCP by promoting the generation of •OH. In addition, the increase of solution pH negatively affected the degradation of 2,4-DCP in the composite polluted system, mainly due to the hindered generation of •OH in the alkaline environment. This work provided theoretical support for the promising application of gBC@nZVI in real environments contaminated with a combination of Cr(VI) and chlorophenols.
研究领域:
环境科学
·
水处理技术
·
污染控制
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Chengfang Zhang,Jingchun Tang,Feilong Gao,Chen Yu,Song Li,Honghong Lyu,Hongwen Sun
The defects of easy agglomeration and oxidation of nano zero valent iron (nZVI) limit its large-scale application in industry, especially in the field of environmental remediation. In this study, the iron nanoparticles encapsulated by graphene nano-shells which anchored on the surface of carbon substrate (nZVI@gBC) were synthesized by a one-step carbothermal reduction method aided by Tetrahydrofuran. When the mass ratio of carbon source to iron source is 2:3 and the carbothermic reduction temperature is 700 °C, stabilized nZVI @gBC can be successfully synthesized with a high iron loading rate of 32.5%. The multilayer graphene shell can effectively prevent the rapid passivation and agglomeration of the nZVI core, and the electronic interaction between the iron nanoparticles core and the graphene carbon shell further enhances the catalytic activity and stability of nZVI@gBC. Therefore, due to the unique structure of graphene nano-shells, nZVI@gBC can be stably stored in the air for more than 80 days. In addition, nZVI@gBC exhibited superior catalytic activity in the experiment of removing 2,4-dichlorophenol (2,4-DCP) in groundwater as a persulfate activator. Notably, both the electron paramagnetic resonance (EPR) and quenching tests showed that SO 4 •− , •OH, O 2 •− and 1 O 2 were both involved in the degradation process of 2,4-DCP, and SO 4 •− were the major active species. Simultaneously, three possible degradation pathways of 2,4-DCP were deduced by GC/MS, which were caused by dechlorination, dehydrogenation or carbon–carbon bond cleavage under the attack of SO 4 •− , •OH, O 2 •− and 1 O 2 . Besides, nZVI@gBC can use the dissolved oxygen in the liquid to generate hydroxyl radicals to effectively remove 2,4-DCP without persulfate. This kind of multifunctional nZVI@gBC may become a promising iron-carbon catalyst for large-scale applications in the field of environmental remediation.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2021
·
IF 3.196
Chenglu Zhang,Lu Zhang,Yuqing Li,Zhixuan Ren,Lu Li,Yanpeng Zhang,Yizheng Li,Cui Liu
A novel 1,8 - naphthalimide - ebselen fluorescent probe BPHN was synthesized. BPHN has great fluorescence properties: high quantum yield (0.5932), large Stokes shift (125 nm) and remarkable stability at wide pH range (5–11). The results of fluorescence spectroscopy experiments show that BPHN can recognize H 2 S selectively and sensitively. BPHN exhibits low LOD (0.129 μM) and fast response (90 s). The potential of BPHN as a biosensor for H 2 S was demonstrated by imaging of exogenous H 2 S in living cells. BPHN can also detect H 2 S qualitatively and quantitatively in actual water samples.
研究领域:
生物化学
·
医学检测
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
LABORATORY INVESTIGATION
·
2022
·
IF 5.502
Ruo-Peng Liang,Xiao-Xue Zhang,Jie Zhao,Rong-Tao Zhu,Wei-Jie Wang,Qin-Wei Lu,Yu-Ling Sun
Ubiquitin-specific protease 3 (USP3), a kind of cysteine protease, is a crucial family member of deubiquitinating enzymes. USP3 is aberrantly expressed in several tumors, which may contribute to cancer progression. However, the role of USP3 in gallbladder cancer (GBC) is still unknown. In the current study, we detected the expression of USP3 in GBC tissues, measured its contribution to the cell proliferation in GBC progression, and further studied the underlying mechanism of USP3 in GBC through pyruvate kinase L/R (PKLR; a kind of glycolytic enzyme). We found that the expression of USP3 in GBC tissues were higher than that of adjacent tissues, and the protein levels of USP3 and PKLR were positively correlated. Additionally, overexpressed USP3 significantly promoted cell proliferation in vitro and tumor growth in vivo, while the silencing of USP3 inhibited proliferation and tumor growth. Glycolysis in GBC cells ws promoted by the USP3 overexpression and inhibited bye USP3 downregulation. Moreover, the loss of USP3 promoted the ubiquitination and weakened the stability of PKLR. Results of the rescue assay confirmed that PKLR knockdown suppressed USP3-induced oncogenic activity in USP3 overexpressed GBC cells. These findings imply that USP3 is an essential positive regulator in GBC progression, and USP3-PKLR plays a vital role in the progression and metabolism of GBC. Ubiquitin-specific protease 3 (USP3), a cysteine protease, is deubiquitinating enzyme. USP3 is aberrantly expressed in several types of tumors. The authors show that USP3 is an important positive regulator in gallbladder cancer progression, and that pyruvate kinase L/R plays a key role in the progression of GBC.
研究领域:
肿瘤学
·
分子生物学
·
癌症生物学
·
细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Chengfang Zhang,Dong Wang,Qinglong Liu,Jingchun Tang
Nanoscale zero-valent iron (nZVI) can react with molecular oxygen to produce reactive oxygen species, but very low yield limits its widespread use. In this study, the effect of ligand-citric acid (CA) addition on the dissolved oxygen (DO) activation for in-situ generation of ROS and subsequent 2,4-DCP degradation by graphene carbon layer coated nZVI composites (GBC@nZVI) was systematically investigated. It was found that the introduction of CA significantly increased the ROS production and resulted in the generation of OH, O 2 − and 1 O 2 with values of 2.1, 2.3, and 1.5 times higher than that in systems without CA, respectively. Ligand CA could enhance the degradation of adsorbed 2,4-DCP over a wide pH range. The CA addition resulted in a significant increase in the degradation of 2,4-DCP from 40.8 % to 79.9 % and a significant decrease in the adsorption from 51.1 % to 19.1 % compared to the system without CA. This phenomenon can be attributed to the fact that the incorporation of CA promoted the efficient recycling of Fe(II)/Fe(III) in the surface-bound state from the iron oxide film on the GBC@nZVI which enhanced the generation of interfacial ROS using DO, and further facilitated the degradation of adsorbed 2,4-DCP rather than immobilization by adsorption alone. On the other hand, the formation of Fe(Ⅲ)-CA complexes with high stability provides enough soluble Fe(II) to produce more ROS in solution via the oxygen reduction. Furthermore, the graphene carbon layer is able to act as an electron conductor to promote the efficient transfer of electrons except to inhibiting the rapid oxidation of Fe 0 . The study not only reveals the promotion effect of ligand-CA addition on the in-situ generation of ROS from nZVI activated dissolved oxygen, but also provides a simple and green strategy for the removal of electron-rich aromatic pollutants from water pollution.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）