Desalination and Water Treatment
·
2024
·
IF 1
Xu Zhang,Fan Yang,Jialing Qin,Huanghu Peng,Zezhou Chen,Lei Che,Shouxin Zhu,Wei Yang
The heterogeneous catalyst of CeO 2 /ZSM5 was applied to hydrolyze Congo red in subcritical water for the first time in the present study. The hydrolysis rate of Congo red could be significantly accelerated by introducing only 5 mg of 5% CeO 2 /ZSM5. The Congo red could be completely hydrolyzed at 220°C for 2 min—a reaction temperature 40°C lower than in the absence of 5% CeO 2 /ZSM5. In addition, the 5% CeO 2 /ZSM5 could be recycled for another run, and its Congo red hydrolysis efficiency and surface morphology showed no obvious change after 3 runs of recycling. The hydrolysis kinetics of Congo red in subcritical water could be well expressed by the Weibull model. The activation energy for hydrolysis of Congo red in subcritical water in the presence of 5% CeO 2 /ZSM5 (104.8 kJ mol –1 ) was much lower than in the absence of 5% CeO 2 /ZSM5 (155.9 kJ mol –1 ). The frequency factors were calculated to be 8.1 × 10 9 and 1.9 × 10 14 min –1 in the presence and absence of 5% CeO 2 /ZSM5, respectively. With these excellent properties, 5% CeO 2 /ZSM5 may prove to be an advantageous catalyst for the hydrolysis of Congo red in textile wastewater, in subcritical water.
研究领域:
环境化学
·
催化化学
·
水处理技术
·
绿色化学
·
反应动力学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Mingyuan Chen,Yaxin Lv,Peilin Wu,Liuyan Dong,Xingquan He,Lili Cui
To obtain highly active electrocatalyst for the whole electrochemical water splitting is of importance to generate hydrogen. Co(OH) 2 is used as electrocatalyst towards OER, however, the performance can be improved further. Usually, to construct the interface and adjust the electronic environment of electrocatalysts are regarded as powerful ways to improve the activity. Herein, CeO 2 -Co(OH) 2 sheets supported on copper foam (CF) are fabricated by electrodeposition method. The morphology and the electron structure of metals are adjusted by changing the molar ratio of Co to Ce, thus, resulting in different electrocatalytic activity. The optimal hybrids of CeO 2 -Co(OH) 2 exhibits lower overpotentials of 188, 269 mV to reach 10 mA cm −2 towards HER and OER, respectively, and good stability. Notably, it is found that the electroactivity is extremely superior to that of bare CF as well as the counterparts in the literature. Also, we try to employ M(OH) 2 (M = Fe, Ni) to substitute Co(OH) 2 to investigate the effect of species of hydroxides on the electron interaction between CeO 2 and hydroxides, the XPS results indicate that Ce and Co shows stronger electron interaction compared to other two control hydroxides. As electrocatalysts for alkaline full water splitting, CeO 2 -Co(OH) 2 requires a cell voltage of 1.62 V to drive 10 mA cm −2 . Experimental results prove the advantages of the electron engineering and morphology control.
研究领域:
材料科学
·
电化学
·
能源化学
·
纳米材料
·
催化化学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Feng Tan,Xiao Jiang,Xianliang Qiao,Daming Sun,Jinsuo Gao,Xie Quan,Jingwen Chen,Suyu Ren,Yi Wang
A diffusive gradients in thin films (DGT) method using a new high-capacity cerium oxide (CeO 2 ) binding gel, for the first time, was developed for measuring dissolved inorganic arsenic in freshwater and seawater . The capacities of the new CeO 2 binding gel were 682 μg and 375 μg for As III and As V , respectively. The masses of As III and As V accumulated by CeO 2 -DGT device increased linearly with time and agreed well with the theoretical value calculated by DGT equation. The arsenic accumulation by CeO 2 -DGT was independent of pH (4.05–9.04) and ionic strength (0.1–750 mM), and common anions including CO 3 2− , SO 4 2− , Cl − and PO 4 3− had no obvious interference. CeO 2 -DGT showed excellent long-term deployment performance in freshwater and synthetic seawater . Field trials with CeO 2 -DGT achieved successfully the time-weighted-average concentrations of total inorganic arsenic in reservoir water (1.38 ± 0.09 μg/L) and coastal seawater (0.45 ± 0.06 μg/L). The results were comparable to those measured by grab sampling. The proposed method was reliable and robust for in-situ measurements of dissolved inorganic arsenic in environmental waters.
研究领域:
环境化学
·
分析化学
·
水环境监测
·
环境地球化学
·
污染生态学
✓ 已验证
DOI
高影响因子
CHEMICAL COMMUNICATIONS
·
2015
·Vol. 51
·期 48
·9785-9788
·
IF 6.834
Chao Wan,Dang-guo Cheng,Fengqiu Chen,Xiaoli Zhan
This communication describes the fabrication of Pt/CeO2 nanotube@SiO2 core–shell catalysts applied to highly efficient water–gas shift reaction, where the initial CO conversion is 30.2% at 250 °C. Pt/CeO2 nanotube@SiO2 core–shell catalysts show outstanding thermal stability, even after accelerated aging under reaction conditions at 450 °C for 6 h, and the morphology is also unchanged after thermal treatment at 800 °C.
研究领域:
材料科学
·
催化化学
·
纳米技术
·
能源化学
·
环境催化
✓ 已验证
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 23
·10393-10401
·
IF 7.79
Xiaodong Hao,Shuai Zhang,Yang Xu,Liangyu Tang,Kazutoshi Inoue,Mitsuhiro Saito,Shufang Ma,Chunlin Chen,Bingshe Xu,Tadafumi Adschiri,Yuichi Ikuhara
Surfactant plays a remarkable role in determining the growth process (facet exposition) of colloidal nanocrystals (NCs) and the formation of self-assembled NC superstructures, the underlying mechanism of which, however, still requires elucidation. In this work, the mechanism of surfactant-mediated morphology evolution and self-assembly of CeO2 nanocrystals is elucidated by exploring the effect that surfactant modification has on the shape, size, exposed facets, and arrangement of the CeO2 NCs. It is directly proved that surfactant molecules determine the morphologies of the CeO2 NCs by preferentially bonding onto Ce-terminated {100} facets, changing from large truncated octahedra (mostly {111} and {100} exposed), to cubes (mostly {100} exposed) and small cuboctahedra (mostly {100} and {111} exposed) by increasing the amount of surfactant. The exposure degree of the {100} facets largely affects the concentration of Ce3+ in the CeO2 NCs, thus the cubic CeO2 NCs exhibit superior oxygen storage capacity and excellent supercapacitor performance due to a high fraction of exposed active {100} facets with great superstructure stability.
研究领域:
材料化学
·
纳米科学
·
催化化学
·
电化学
·
无机功能材料
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 25
·16785-16794
·
IF 4.123
Wei Xia,Jun Zhao,Tao Wang,Li Song,Hao Gong,Hu Guo,Bing Gao,Xiaoli Fan,Jianping He
Polymer networks such as those of epoxy resin, as common protection materials, possess radiolytic oxidation degradation effects under gamma irradiation environment, which have a great accelerating effect on the ageing rate and severely limit their potential applications for metal protection in the nuclear industry. To overcome this, we report a simple scheme of anchoring crystalline ceria nanoparticles onto graphene sheets (CG) and incorporate it into the epoxy resin, followed by thermal polymerization to obtain CeO2/graphene-epoxy nanocomposite coating (CGNS). We had proven that graphene might act as “interwalls” in the epoxy matrix, which will result in space location-obstruct effect as well as absorb the radicals induced by γ-ray irradiation. Moreover, owing to the interconversion of cerium ions between their +3 and +4 states coupled with the formation of oxygen vacancy defects, electron spin resonance (ESR) detection shows that CeO2/graphene (CG) could act as a preferable radical scavenger and achieve better performance in trapping radicals than single graphene based composite. Electrochemical data strongly demonstrate that CeO2/graphene is capable of maintaining the anti-corrosion properties under gamma irradiation environment. Therefore, the designed hybrid CeO2/graphene-epoxy composite can be considered as potential candidates for protective coatings in nuclear industry.
研究领域:
材料科学
·
核工业防护
·
高分子化学
·
纳米复合材料
·
电化学防腐
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Dan Baohui,Mahmood ul Haq,Salah Ud Din,Shabab Hussain,Shao Wenyi,Wu Jingmin,Chi Hanwen,Zhizhen Ye,Liping Zhu
The SF 6 gas in gas-insulated switchgear (GIS) systems decomposes into SO 2 F 2 , SOF 2 , SO 2 , and H 2 S under abnormal conditions such as partial discharge. The detection of these decomposition gases with high sensitivity is essential for the safe operation of GIS devices. Herein, we report the synthesis of cerium oxide and multiwalled carbon nanotube composite (CeO 2 @MWCNTs). The CeO 2 @MWCNTs composite was characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy , X-ray photoelectron spectroscopy, and Brunauer–Emmett–Teller analysis. The CeO 2 @MWCNTs composite sensor provided a response value of 7.7 at 100 ppm of SO 2 F 2 at a low operating temperature (50 °C), and the response and recovery features of the CeO 2 @MWCNTs composite sensor were recorded at 43 and 28 s, respectively. Moreover, the composite sensor exhibited excellent stability after two months. The developed CeO 2 @MWCNTs composite sensor can offer an exceptional platform for gas sensing applications in diverse fields.
研究领域:
材料科学
·
气体传感技术
·
电力设备监测
·
纳米复合材料
·
环境监测
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）