Processes
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2023
·Vol. 11
·期 4
·1075
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IF 3.5
Zhaochen Huang,Guoqiang Huang
Usually, the ion implantation gases used in semiconductor production are required to be extremely high in purity. Due to the presence of trace CO2in electronic special gas BF3, the quality of the material is significantly affected, which makes it crucial to impose control on CO2content. Unlike a series of blank adsorbents reported in other studies, the zinc-loaded adsorbents prepared in this study are intended for the adsorption of CO2from CO2/BF3. Firstly, the materials were characterized by XRD, BET, SEM-EDS and TG-DSC analysis, etc., and the breakthrough curves of the adsorbents as obtained under different preparation conditions were investigated at 20 °C and 200 kPa. The results show that the adsorption performance reached the optimal level when the activation temperature was 450 °C and a 13X molecular sieve was impregnated by 0.15 mol/L Zn(NO3)2. Moreover, compared with the Zn-13X, the breakthrough time was reduced to 69% and 44% in two adsorption cycles, respectively. Finally, FTIR was used to reveal the adsorption mechanism of the carbonates produced by CO2adsorption. It was found that the adsorption performance was affected by the irreversible reduction in the number of active sites due to the continuous formation of polydentate carbonate during adsorption and regeneration.Keywords:CO2adsorption;13X molecular sieve;carbonate species
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Xuanwen Xu,Guoqiang Huang,Shuai Qi
Adsorbents including CuCl 2 -AC, CuCl 2 -13X, Cu(NO 3 ) 2 -AC and Cu(NO 3 ) 2 -13X were prepared to remove trace phosphine from recycled hydrogen in the Siemens process of producing polysilicon , and adsorptive mechanisms were determined by X-ray diffraction and intermittent breakthrough experiments. CuCl 2 could disperse better on supporters than Cu(NO 3 ) 2 , and it existed in its original form. However, Cu(NO 3 ) 2 decomposed into copper oxide or basic cupric nitrate, and showed conspicuous thermal aggregation effect after calcination . Interactive effects between cupric components and supporters varied form species to species and deactivated the reactivity of CuCl 2 and Cu(NO 3 ) 2 in different degree, which resulted in disparities of adsorbents’ performances. CuCl 2 -AC and Cu(NO 3 ) 2 -AC had better performances than CuCl 2 -13X and Cu(NO 3 ) 2 -13X because cupric components were deactivated more when loaded on 13X zeolite. Chemical transformation of phosphine made adsorbents’ surface renewable, and the renewed rate depended on the reactivity of cupric components. All of adsorbents showed significant recoveries of efficiencies in intermittent experiments.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 14
·8792-8803
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IF 4.036
Shi-Jie Li,Xiang-Yu Yang,Li-Sheng Deng,Yong-Chun Fu,Ming-Jun Pang,Ti Dong,Yi-Song Yu,Ling-Na Su,Shang Jiang
In this research, the core objective is to explore the effect of super-absorbent polymer material (poly(sodium acrylate)) on the heat storage performance of magnesium sulfate and to investigate the heat transfer behavior of 13X-zeolite, nano-aluminum oxide (nano-Al2O3) and poly(sodium acrylate) modified magnesium sulfate in a reactor. Finally it provides support for future material and reactor design. All characterizations and performance tests were done in the laboratory and a numerical simulation method was used to investigate the heat transfer behavior of the reactor. Through hydrothermal treatment, bulk MgSO4·6H2O was changed into nanoparticles (200–500 nm) when composited with poly(sodium acrylate), 13X-zeolite and nano-Al2O3. Among these materials, MgSO4·6H2O shows the highest activation energy (36.8 kJ mol−1) and the lowest energy density (325 kJ kg−1). The activation energy and heat storage energy density of nano-Al2O3 modified composite material MA-1 are 28.5 kJ mol−1 and 1305 kJ kg−1, respectively. Poly(sodium acrylate) modified composite material, MPSA-3, shows good heat storage energy density (1100 kJ kg−1) and the lowest activation energy (22.3 kJ mol−1) due its high water-absorbing rate and dispersing effect. 13X-zeolite modified composite material MZ-2 shows lower activation energy (32.4 kJ mol−1) and the highest heat storage density (1411 kJ kg−1), which is 4.3 times higher than that of pure magnesium sulfate hexahydrate. According to the heat transfer numerical simulation, hygroscopic additives could prominently change the temperature distribution in the reactor and efficiently release heat to the thermal load side. The experimental and numerical simulation temperatures are similar. This indicates that the result of the numerical simulation is very close to the actual heat transfer behavior. This reactor could output heat at around 50 °C and absorb heat in the range of 100–200 °C. All these results further prove the strategy that thermochemical nanomaterial synthesis technology combined with material-reactor heat transfer numerical simulation is feasible for future material and reactor design.
研究领域:
材料科学
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能源工程
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化学工程
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DOI
PubMed
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2024
·
IF 3
Zou Yanyan,Pau Dennis,Yi Linlin,Li Yaoqiang,Li Kaiyuan
13X zeolite–calcium oxide (CaO) composite capture agent application in the pyrolysis recovery of polyvinyl chloride (PVC)-based waste cables was investigated in this research to elucidate the agent’s efficiency in capturing chlorine (Cl) and carbon (C) during pyrolysis. The 13X zeolite–CaO mixture is subjected to separate pyrolysis of the PVC-based cable outer sheath in experimental furnaces of simulated solar-powered and thermogravimetry. Subsequently, a range of spectroscopic techniques are employed to quantitatively analyze the gaseous and solid products resulting from the pyrolysis process. Through X-ray fluorescence, total carbon, and other analyses, the research outcomes demonstrated that the capture agent exhibits superior Cl and C capture performance compared to using a single agent for plastic pyrolysis. The yield of Cl element in the solid residue has increased significantly by 130–140% under the presence of optimized composite capture agent. By determining the dynamic changes of gaseous and solid products during the cable outer sheath pyrolysis, the influence of the capture agent on the redistribution and transformation mechanisms of Cl and C elements was identified, and it was found that contaminating volatiles were well immobilized in the solid residue. This research provides a new solution for efficient Cl and C capture in the pyrolysis recovery of waste cables and determines the fixation and transformation mechanisms of Cl and C elements by the composite capture agent, indicating a potential for feasible and sustainable resource utilization of waste cables.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2024
·
IF 4.8
Qing Sun,Jiao Yan,Xiaofang Hu,Jiale Yu,Jian Zhang,Jiawei Sheng
A facile urea-assisted hydrothermal method was developed for synthesizing Co(Ca)-silicate nanosheets@13X (CoCa-13X) as catalyst materials for peroxymonosulfate activation. Urea gradually dissolves 13X to form the silicate anion, and anchors Co 2+ ions to the surface of 13X, while introducing Ca 2+ ions to form in situ Co/Ca-silicates. The degradation efficiency and reusability of the compound catalyst for metronidazole (MNZ) were investigated. The results demonstrated that at an initial concentration of 25 mg/L, the CoCa-13X-PMS system exhibited excellent catalytic degradation performance towards MNZ, and the degradation rate reached 99.52 % within 5 min. Furthermore, the CoCa-13X-PMS system maintained high catalytic activity against various organic pollutants and even at high concentrations of pollutants (up to 30 mg/L). Free radical quenching experiments revealed simultaneous participation of SO 4 • – and 1 O 2 in the oxidation process simultaneously. Additionally, the degradation mechanism and pathway of MNZ were studied and proposed, along with evaluation of biotoxicity associated with its degradation intermediates. This method offers a novel strategy for synthesizing silica zeolite-based cobalt catalysts with exceptional PMS activity for removal of organic pollutants.
研究领域:
环境科学
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催化材料
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DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 25
·13728-13738
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IF 2.936
Yongxian Zhou,Wei Chen,Pengfei Wang,Yimin Zhang
The low contact efficiency, large mass transfer resistance and high operational cost of traditional 13X molecular sieve particle adsorbents (MSPs) have greatly limited their application in deep purification of trace oxygenated compounds from gaseous olefins. Herein, we successfully fabricated dense and thin 13X molecular sieve membranes on a porous α-Al2O3 tube (MSCMs) by a combination of 3-aminopropyl triethoxy silane (APTES) surface modification and vacuum pre-coating sol technology for purifying the above impurities. By a solid–solution transformation process, 13X molecular sieve membranes on MSCMs that were continuous and integral without any cracks, pinholes or other defects, and mainly composed of 1–1.5 μm regular 13X crystals with a thickness of 5–6 μm have been achieved. The purification performance of the MSPs, non-APTES functionalized MSCMs (nMSCMs) and MSCMs was evaluated by dynamic adsorption of N2 or C2H4 feed flow containing dimethyl ether, methanol and propanal impurities at room temperature. The results demonstrated that both the nMSCMs and MSCMs could deeply purify the trace amounts of the three oxygenated compounds to below 1 × 10−6 (mol mol−1) from gaseous olefins at an initial concentration of 20 × 10−6 (mol mol−1), exhibiting much more excellent purification performance than that of MSPs. In particular, the breakthrough times of MSCMs for dimethyl ether, methanol and propanal were 7 h, 32 h and 51 h in a N2 system, and 12.1 h, 53 h and 90 h in a C2H4 system. The cumulative adsorption amounts of MSCMs for dimethyl ether, methanol and propanal were 12.108 mg g−1, 35.812 mg g−1 and 103.129 mg g−1 in a N2 system, and 25.88 mg g−1, 94.19 mg g−1 and 256.26 mg g−1 in a C2H4 system, respectively. The regeneration experiment also indicated that the MSCMs had a more stable structure and a longer lifetime. The excellent purification performance of MSCMs could be attributed to the continuous 13X molecular sieve layers without non-adsorption interfacial voids. Hence, the MSCMs have great potential for future industrial application of trace oxygenated compound removal from gaseous olefins.
研究领域:
化学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
POLYMER BULLETIN
·
2014
·Vol. 71
·期 11
·2981-2997
·
IF 1.491
Li Mei,Li Gu,Fan Yifei,Jiang Juan,Ding Qian,Dai Xin,Mai Kancheng
To improve the photo-oxidation degradation resistance and antimicrobial ability of ZnO-filled polypropylene random copolymer (PPR), 13X zeolite particles supported with nano-ZnO with different morphologies were prepared and used to manufacture filled PPR composites. The formation of ZnO with different morphologies on the surface of 13X zeolite was proved by atomic absorption spectroscopy, scanning electron microscope, UV–vis spectra, and fluorescence spectra. The results indicated that the photo-oxidation degradation resistance of nano-ZnO-supported 13X zeolite-filled PPR composites is higher than that of PPR composites filled by the same content of pure nano-ZnO. Antimicrobial experiment results show that nano-ZnO-supported 13X zeolite-filled PPR composites exhibit higher antimicrobial properties than ZnO-filled PPR composites prepared by directly adding nano-ZnO into PPR matrix for Staphylococcus aureus and Escherichia coli . The addition of nano-ZnO-supported 13X zeolite particles increases the crystallization temperature, but has no influence on the melting behavior of PPR composites.
研究领域:
材料科学
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高分子化学
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微生物学
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DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
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2017
·Vol. 32
·期 22
·4232-4240
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IF 1.673
Mei Li,Lijun Wu,Zishou Zhang,Kancheng Mai
To improve the antimicrobial properties of ZnO, ZnO-supported 13X zeolite (X-ZnO) was prepared via the facile chemical method. Antimicrobial activities of X-ZnO and ZnO were tested against Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria. X-ZnO showed noticeable antimicrobial activities against E. coli and S. aureus under visible light conditions, especially against E. coli. The minimum inhibitory concentration (MIC) of X-ZnO against E. coli was 0.12–0.24 mg/mL. However, there were still much bacteria alive in the nano-ZnO suspensions at the same concentration. To elucidate the antimicrobial activities of X-ZnO, the average concentration of the total reactive oxygen species (ROS) and Zn2+ ions released from X-ZnO and nano-ZnO were quantitatively analyzed. The obtained results indicated that the average concentration of ROS produced by supported ZnO was much higher than that of nano-ZnO. And the released Zn2+ ions from X-ZnO and nano-ZnO suspensions were much lower than the MIC of Zn2+. Thus, it is believed that the production of ROS in X-ZnO and nano-ZnO suspensions resulted in the difference of antibacterial activities.
研究领域:
材料科学
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微生物学
·
光催化
✓ 已验证
DOI
高影响因子
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