scholarly journals Effect of calcination temperature on the catalytic performance of CoFe2O4/Nitrogen doped sludge based activated carbon in activation of peroxymonosulfate for degradation of coking wastewater

2018 ◽  
Vol 238 ◽  
pp. 03009
Author(s):  
Yongkang Tao ◽  
Lihua Li ◽  
Lixiong Ren ◽  
Yu Liang ◽  
Xin Wang
Keyword(s):  
Activated Carbon ◽  
Calcination Temperature ◽  
Removal Rate ◽  
Polymer Network ◽  
Catalytic Performance ◽  
Coking Wastewater ◽  
Nitrogen Doped ◽  
Catalytic Activities ◽  
Toc Removal ◽  
First Time

A novel supported heterogeneous magnetic catalyst CoFe2O4/N-doped sludge based activated carbon (CoFe2O4/N-SAC) was prepared by polymer network gel method for the first time. The physicochemical properties of the materials were characterized by means of XRD, SEM, TEM, VSM and XPS techniques. The prepared catalyst is applied to the heterogeneous activation of peroxymonosulfate for degradation of coking wastewater, and the effect of calcination temperature on the catalytic activity was investigated. The result reveals that the catalyst shows the highest catalytic activities under the calcination temperature is 800 °C with the TOC removal rate of coking wastewater is 84.31%.

scholarly journals Optimization of catalytic wet oxidating fulvic acid with zero-valent copper chitosan activated carbon ball as the catalyst

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Chaofei Song ◽  
Yue Lv ◽  
Xia Qin ◽  
Chengrui Guo ◽  
Jiaxin Cui ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Fulvic Acid ◽  
Removal Rate ◽  
Influence Factors ◽  
Copper Ion ◽  
Correlation Coefficients ◽  
Processing Parameters ◽  
Catalytic Performance ◽  
Catalytic Wet Oxidation ◽  
Toc Removal

AbstractThe degradation efficiency of fulvic acid (FA) was investigated in the catalytic wet oxidation process (CWPO) by zero-valent copper chitosan activated carbon ball (ZVC/CTS-ACB). Characterization of ZVC/CTS-ACB shows that zero-valent copper was loaded successfully on the chitosan activated carbon. Plackett–Buiman (PB) design and response surface methodology (RSM) were employed to determine the influence factors and the optimum processing parameters. The model was well fitted to the actual data and the correlation coefficients of R2 and R2-adj were 0.9359 and 0.9039, respectively. Under the obtained optimum conditions for FA degradation: temperature = 94 °C and pH 3.8, the average FA removal by three replicate experiments was 93.02%, which has a high consistency to the RSM optimal target response of 93.86%. The comparison of catalytic performance showed that the addition of catalyst ZVC/CTS-ACS could increase the removal rate of FA, color number (CN) and TOC by 93.6%, 83.5% and 81.9% respectively. The high TOC removal rate indicated the good performance of the catalyst to FA mineralization. Additionally, the ICP analysis of copper ion leaching was only 0.08 mg/l after 5 repeated recycles of the catalyst, demonstrating the high stability of ZVC/CTS-ACB that is beneficial for the actual application.

Catalytic Wet Oxidating Fulvic Acid By Zero-Valent Copper Chitosan Activated Carbon Ball: Plackett-Buiman Design and Response Surface Modeling Optimization

2021 ◽  
Author(s):  
Chaofei Song ◽  
Yue Lv ◽  
Xia Qin ◽  
Jiaxin Cui ◽  
Chengrui Guo ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Fulvic Acid ◽  
Response Surface ◽  
Removal Rate ◽  
Catalytic Performance ◽  
High Catalytic Activity ◽  
Catalytic Wet Oxidation ◽  
Experimental Conditions ◽  
Statistical Tool ◽  
Average Maximum

Abstract In this paper, the active component zero-valent copper (ZVC) supported by chitosan activated carbon ball (CTS-ACB) (i.e. ZVC/CTS-ACS catalyst) was successfully prepared. The characterization results showed obvious characteristics of activated carbon and zero-valent copper. The catalyst was used to degrade fulvic acid (FA) in catalytic wet oxidation(CWO) system. The two significant factors acidity and temperature were found with the statistical tool Plackett-Buimanhe(PB) in CWO for FA removal. Then the response surface methodology(RSM) model was used to optimize the experimental conditions in order to obtain the optimal FA removal rate. With the optimal experimental parameters, that is, a temperature of 94°C and an acidity of 3.8, the average maximum removal rate of FA was 93.02%, which was in agreement with the expected result of the model 93.86%, indicating that the model is well established. The comparison of catalytic performance showed that the addition of catalyst ZVC / CTS-ACS could increase the removal rate of FA, colour number(CN) and TOC by 93.6%, 83.5% and 81.9% respectively. The utilization of ZVC can greatly increase the mineralization rate of FA , which indicates the high catalytic activity and minerazation of the catalyst.

scholarly journals Catalytic Performance of Nitrogen-Doped Activated Carbon Supported Pd Catalyst for Hydrodechlorination of 2,4-Dichlorophenol or Chloropentafluoroethane

Molecules ◽  
2019 ◽  
Vol 24 (4) ◽  
pp. 674 ◽  
Author(s):  
Haodong Tang ◽  
Bin Xu ◽  
Meng Xiang ◽  
Xinxin Chen ◽  
Yao Wang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Liquid Phase ◽  
Gas Phase ◽  
Nitrogen Doping ◽  
Catalyst Surface ◽  
Catalytic Performance ◽  
Atomic Ratio ◽  
Pd Catalyst ◽  
Nitrogen Doped ◽  
The Stability

Nitrogen-doped activated carbon (N-AC) obtained through the thermal treatment of a mixture of HNO3-pretreated activated carbon (AC) and urea under N2 atmosphere at 600 °C was used as the carrier of Pd catalyst for both liquid-phase hydrodechlorination of 2,4-dichlorophenol (2,4-DCP) and gas-phase hydrodechlorination of chloropentafluoroethane (R-115). The effects of nitrogen doping on the dispersion and stability of Pd, atomic ratio of Pd/Pd2+ on the surface of the catalyzer, the catalyst’s hydrodechlorination activity, as well as the stability of N species in two different reaction systems were investigated. Our results suggest that, despite no improvement in the dispersion of Pd, nitrogen doping may significantly raise the atomic ratio of Pd/Pd2+ on the catalyst surface, with a value of 1.2 on Pd/AC but 2.2 on Pd/N-AC. Three types of N species, namely graphitic, pyridinic, and pyrrolic nitrogen, were observed on the surface of Pd/N-AC, and graphitic nitrogen was stable in both liquid-phase hydrodechlorination of 2,4-DCP and gas-phase hydrodechlorination of R-115, with pyridinic and pyrrolic nitrogen being unstable during gas-phase hydrodechlorination of R-115. As a result, the average size of Pd nanocrystals on Pd/N-AC was almost kept unchanged after liquid-phase hydrodechlorination of 2,4-DCP, whereas crystal growth of Pd was clearly observed on Pd/N-AC after gas-phase hydrodechlorination of R-115. The activity test revealed that Pd/N-AC exhibited a much better performance than Pd/AC in liquid-phase hydrodechlorination of 2,4-DCP, probably due to the enhanced stability of Pd exposed to the environment resulting from nitrogen doping as suggested by the higher atomic ratio of Pd/Pd2+ on the catalyst surface. In the gas-phase hydrodechlorination of R-115, however, a more rapid deactivation phenomenon occurred on Pd/N-AC than on Pd/AC despite a higher activity initially observed on Pd/N-AC, hinting that the stability of pyridinic and pyrrolic nitrogen plays an important role in the determination of catalytic performance of Pd/N-AC.

scholarly journals Advanced treatment of biologically treated coking wastewater by persulfate oxidation with magnetic activated carbon composite as a catalyst

2018 ◽  
Vol 77 (7) ◽  
pp. 1891-1898 ◽  
Author(s):  
Xiulan Song ◽  
Chao Wang ◽  
Meiqin Liu ◽  
Miao Zhang
Keyword(s):  
Activated Carbon ◽  
Carbon Composite ◽  
Gas Chromatography Mass Spectrometry ◽  
Advanced Treatment ◽  
Coking Wastewater ◽  
Green Catalyst ◽  
Persulfate Oxidation ◽  
Magnetic Activated Carbon ◽  
Toc Removal ◽  
First Order Kinetics

Abstract Advanced treatment of biologically treated coking wastewater (BTCW) using persulfate (PS) oxidation with magnetic activated carbon composite (CuFe2O4:AC w/w ratio of 1:1.5, denoted as 1.5-MACC) as a green catalyst was evaluated at ambient temperature (30 °C). Effects of PS (K2S2O8) and 1.5-MACC doses on PS decomposition and total organic carbon (TOC) removal in BTCW were also studied during 360 min. The results showed that the 1.5-MACC/PS system has a much better performance on TOC removal in BTCW than only 1.5-MACC or PS system. PS decomposition and TOC removal follow first-order kinetics in the 1.5-MACC/PS system. The optimum condition of the 1.5-MACC/PS system to treat BTCW is with a K2S2O8 dose of 4 g L−1 and 1.5-MACC dose of 5 g L−1. Under this condition, TOC in the PS oxidation effluent is 20.4 mg L−1 with a removal efficiency of 85.4%. TOC removal is a synergistic effect of adsorption and oxidation. TOC oxidation is due to the generation of ·SO4− via the activation of PS by CuFe2O4 impregnated AC. The gas chromatography–mass spectrometry (GC-MS) analysis revealed that phenol compounds and esters were removed significantly by the 1.5-MACC/PS system. When 1.5-MACC was used for the fourth time in the 1.5-MACC/PS system, the removal ratio of TOC was still over 62.2% in 360 min reaction. Thus, the 1.5-MACC/PS system has a potential practical application in treatment of BTCW.

Activated carbon from nitrogen rich watermelon rind for high-performance supercapacitors

RSC Advances ◽  
2016 ◽  
Vol 6 (64) ◽  
pp. 59333-59342 ◽  
Author(s):  
Ru-Juan Mo ◽  
Yang Zhao ◽  
Min Wu ◽  
Hong-Mei Xiao ◽  
Shigenori Kuga ◽  
...  
Keyword(s):  
Activated Carbon ◽  
High Performance ◽  
Carbon Materials ◽  
Nitrogen Doped ◽  
Watermelon Rind ◽  
Biomass Materials ◽  
Nitrogen Doped Carbon ◽  
First Time

Nitrogen rich biomass materials was selected as precursor of nitrogen-doped carbon materials for supercapacitor for the first time.

scholarly journals Adsorption of COD in Coking Wastewater on Nitric Acid-Modified Blue Coke Activated Carbon

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Xu Jiang ◽  
Xinzhe Lan ◽  
Yonghui Song ◽  
Xiangdong Xing
Keyword(s):  
Activated Carbon ◽  
Nitric Acid ◽  
Removal Rate ◽  
Nitric Acid Concentration ◽  
Oxygen Demand ◽  
Coking Wastewater ◽  
Order Kinetic ◽  
Acid Modification ◽  
Order Kinetic Model ◽  
Cod Removal Rate

The blue coke activated carbon (BAC) modified by nitric acid at different concentrations was used as an adsorbent to remove COD from coking wastewater. Characterization of BAC was performed using N2 adsorption/desorption techniques, scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), and Boehm titration. The results showed the Brunner–Emmet–Teller (BET) specific surface area and iodine value of BAC became higher after modification, and the adsorption capacity of BAC for coking wastewater was effectively improved with nitric acid modification. The optimal nitric acid concentration for modification was 3 mol/L (BAC-N3), which had more acid functional group contents than unmodified. The chemical oxygen demand (COD) removal rate was to reach 77.05% when 4 g BAC-N3 was added into 50 mL coking wastewater in 120 min with a shaking speed of 100 rpm at 25°C. Langmuir model could better describe equilibrium adsorption data by BAC-N3, and the kinetic study showed that the adsorption process was best fitted by the pseudo-second-order kinetic model.

Pilot Scale Study on Advanced Treatment of Coking Wastewater with Biological Activated Carbon Technology

2014 ◽  
Vol 1073-1076 ◽  
pp. 995-999
Author(s):  
Jin Li ◽  
Guang Hua Wang ◽  
Wen Bing Li ◽  
Zheng Zhu ◽  
Yin An Zhu
Keyword(s):  
Activated Carbon ◽  
Removal Rate ◽  
Pilot Scale ◽  
Operating Conditions ◽  
Laboratory Scale ◽  
Advanced Treatment ◽  
Coking Wastewater ◽  
Biological Activated Carbon ◽  
Scale Test ◽  
Cod Removal Rate

This paper reports about a pilot-scale feasibility study of Advanced Treatment of Coking Wastewater with Biological Activated Carbon technology based on the better experimental data of laboratory scale test .The self-designed of the Biological Activated Carbon Aerated tower was based on the optimal operating conditions of the results obtained from laboratory scale test.The removal efficiency to pollutants of efficient compound bacterium is estimated in biological activated carbon process through the variation of COD concentration, chromaticity, and Contrast the total ion chromatogram and UV absorbance spectrum of effluent and inflow.The results of the pilot-scale test show that BAC technology may be a suitable option for the advanced treatment of Coking Wastewater. the efficient degrading strains can reproduce on the activated carbon quickly.Concentrations of COD and chromaticity in outflow water were at a lower level (with COD about 60mg/L and chromaticity about 50 degree), the average COD removal rate greater than 50% and chromaticity removal rate greater than 70%.

Synthesis of a flower-like Zr-based metal–organic framework and study of its catalytic performance in the Mannich reaction

RSC Advances ◽  
2015 ◽  
Vol 5 (25) ◽  
pp. 19273-19278 ◽  
Author(s):  
Yi Luan ◽  
Yue Qi ◽  
Zhaokui Jin ◽  
Xiong Peng ◽  
Hongyi Gao ◽  
...  
Keyword(s):  
Mannich Reaction ◽  
Metal Organic Framework ◽  
Catalytic Performance ◽  
Catalytic Activities ◽  
Metal Organic ◽  
The Mannich Reaction ◽  
First Time ◽  
Organic Framework

UiO-66-(COOH)2 with flower-like morphology was synthesized for the first time and its heterogeneous Brønsted acidic catalytic activities have been studied.

A Study on Advanced Treatment for Coking Wastewater with Biological Activated Carbon Based on Efficient Degrading Flora

2012 ◽  
Vol 581-582 ◽  
pp. 1129-1132 ◽  
Author(s):  
Guang Hua Wang ◽  
Xue Qin Liu ◽  
Wen Bing Li ◽  
Yun Zhou Lu ◽  
Ming Dong Sun
Keyword(s):  
Waste Water ◽  
Activated Carbon ◽  
Removal Efficiency ◽  
Removal Rate ◽  
Cod Removal ◽  
Advanced Treatment ◽  
Coking Wastewater ◽  
Biological Activated Carbon ◽  
Removal Ratio ◽  
Cod Removal Rate

The removal efficiency of degrading flora which has been constructed is investigated in biological carbon process through the variation of COD and chromaticity. The results show that the efficient degrading strains can reproduce on the activated carbon quickly；the biological activated carbon reactor，in which degrading flora to coking waste water are inoculated，is adopted to carry out the treatment of wastewater，in such a way the COD and chromaticity in outflow water can remain at a lower level (with COD about 50mg/L and chromaticity about 50 degree). The average COD removal rate is 71% and the chromaticity removal ratio is 95%.

Preparation of Mo-Fe/SiO2 and Catalytic Selective Oxidation of p-Xylene

2011 ◽  
Vol 396-398 ◽  
pp. 782-785
Author(s):  
Yan Qiu Huang ◽  
Zi Li Liu ◽  
Jie Liu ◽  
Zu Zeng Qin ◽  
Jin Wen Wang ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Calcination Temperature ◽  
Selective Oxidation ◽  
Sol Gel ◽  
Catalytic Performance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Catalytic Activities

The preparation of Mo–Fe/SiO2 catalysts by sol-gel method, catalytic selective oxidations of p-xylene to terephthalaldehyde over the Mo–Fe/SiO2 catalyst, and the effects of the supported metal on the catalytic activities were investigated. The catalysts were characterized by thermal analysis, X-ray diffraction, and Fourier transform infrared spectroscopy. Results show that the presence of Fe enhances the catalytic performance of Mo–Fe/SiO2 on the selective oxidation of p-xylene. The addition of the optimal concentration of 15% Fe results in 53.2% conversion and 33.3% selectivity. The optimal calcination temperature of the Mo–Fe/SiO2 catalyst was 500 °C.

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