JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2024
·
IF 3
Zou Yanyan,Li Yaoqiang,Zhang Jiaqing,Guo Yi,Song Tonglei,Li Kaiyuan,Xu Mingjun
The incineration of a large number of old cables leads to the problem of green recycling and causes a lot of environmental problems. This paper investigates the effect of copper oxide (CuO) capture of chlorine (Cl) in the pyrolysis recycling of polyvinyl chloride (PVC)-based waste cable outer sheath, focusing on the redistribution of the contaminant Cl components under the action of oxygen (O 2 ). Analytical methods such as ion chromatography and diffraction of X-rays are employed to measure and quantify the dynamic changes of the Cl-containing three-phase products during the pyrolysis process. The results indicate that, compared to copper (Cu), the oxidized state of CuO and O 2 -rich conditions can enhance the capture of Cl. With increasing O 2 supply, 1.71–6.33 mass% of gas-phase Cl and 14.52–29.96 mass% of liquid-phase Cl convert into 16.23–36.29 mass% of solid-phase Cl. CuO reacts directly with the PVC component of the outer sheath in a solid–solid reaction, significantly reducing the generation of polluting Cl-containing aromatic compounds in the liquid-phase tar and synergistically facilitating CaCO 3 components to intimately contact with the pyrolysis gas to capture HCl. The originally stable CuCl 2 crystals are oxidized again to enter into cyclic adsorption in the form of CuO under O 2 -rich conditions. Cl is more fixed in the residue and primarily exists in the form of stable and safe CuCl 2 and CaCl 2 metallic compounds. This study has clearly elucidated the efficient in situ green solidification mechanism of Cl during the treatment of cable waste with CuO in the presence of O 2 , providing new recommendations for cable sheath formulations and solid waste management.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2025
·
IF 6.2
Yande Cai,Ze Wang,Jianjun Wang,Songgeng Li
The formation of chloride products in the process for pyrolysis of municipal solid wastes (MSW) with key model components was investigated by Py-GC/MS method. HCl and CH 3 Cl are identified as the most abundant chloride products for the individual pyrolysis of polyvinyl chloride (PVC) or corn straw (CS) in the range of 200–600 °C. For the pyrolysis of CS, a higher temperature is more favorable for the generation of HCl than that of CH 3 Cl. In the PVC pyrolytic products, chlorobenzene (Ph-Cl), benzyl chloride (Ph-CH 2 Cl), and 1-(chloroethyl)benzene (Ph-CHClCH 3 ) are also detected but in extremely low amounts. For the co-pyrolysis of PVC/CS, the formation of CH 3 Cl is significantly promoted. The synergistic effect in the PVC/CS co-pyrolysis process is mainly attributed to the reaction between the HCl derived from PVC and the decomposition products of lignin. The products of Ph-Cl and Ph-CH 2 Cl are mainly generated from the cyclization of Cl-containing chain species. CH 3 Cl and Ph-CHClCH 3 are mainly generated from secondary reactions between HCl and other pyrolytic products. No remarkable synergistic effect is observed on the formations of chlorides in the co-pyrolysis of PVC/PP (polypropylene), while the generation of Ph-CHClCH 3 is significantly enhanced in the co-pyrolysis of PVC/PS (polystyrene).
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Uddin Sk Raihan,Jingqi Zhang,Jingbo Chao,Qing Hu,Frederic Coulon,Xiao Jin Yang
Chlorinated phenols are highly toxic to human and ecosystem and their biological degradation is difficult. In this work, a novel MgAlNi alloy catalyst was developed for rapid chemical degradation of p-chlorophenol (4-CP) in water under mild conditions via in situ hydrodechlorination ( i HDC) without external hydrogen gas supply. A complete conversion of 0.195 mM 4-CP to phenol was achieved within 15 min with a reaction rate constant of 7.65 h −1 , 19.4 times higher than that of the traditional Raney Nickel (AlNi alloy) catalyst. The excellent performance of MgAlNi alloy catalyst is attributed to enhanced H 2 generation by Mg etching, surface self-reconstruction by growth of in situ layered double hydroxide ( i LDH) nanosheets of 0.08–1 nm, exposed active sites of AlNi intermetallic compounds Al 3 Ni 2 and Al 3 Ni. The findings of this study provide new insights into broader applications of nanoconfinement catalysis to environmental remediation and open a new domain of in situ nanoconfinement catalysis ( i NCC).
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Jing Wang,Sisi Fan,Hongmin Duan,Jinming Xu,Yanqiang Huang
Carbon spheres with hierarchical pore structure were successfully synthesized by using strongly basic anion exchange resins exchanged with silicate, followed by pyrolysis in an inert atmosphere and etching silica. As a result of the quaternary ammonium group in the anion exchange resin structure, these carbon spheres were doped with nitrogen. The performance of these carbon spheres in the catalytic dehydrochlorination of 1,2-dichloroethane (EDC) was improved with the increase of calcination temperature, and the carbon sphere 900-900-RC showed the highest conversion rate (96.7%) and a selectivity to vinyl chloride above 99%. The structural and surface properties of N-doped carbon spheres were characterized by scanning electron microscopy, nitrogen sorption, and Raman and X-ray photoelectron spectroscopy. The result of these characterizations further verified that the quaternary nitrogen species are as effective as pyridine nitrogen species in this catalyst.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
IONICS
·
2020
·Vol. 26
·期 8
·3901-3909
·
IF 2.394
Li Mei,Sun Zhongxuan,Guo Dan,Han Wei,Sun Yang,Yang Xiaoguang,Zhang Milin
The electrode reaction of Pr(III) and coreduction of Pb(II) and Pr(III) were studied on an inert W electrode in eutectic LiCl-KCl to extract Pr from molten salt. The electrode process kinetic of Pr(III) on W electrode was firstly explored employing cyclic voltammetry (CV) and Tafel technique, such as the diffusion coefficient of Pr(III) in eutectic LiCl-KCl and the exchange current density ( j 0 ) for Pr(III)/Pr(0) couple and the electrode reaction activation energy. Then, various electrochemical techniques were used to investigate the coreduction of Pb(II) and Pr(III). Four cathode current peaks ascribed to the formation of Pr x Pb y intermetallic compounds were detected, which indicated that the Pr could deposit on pre-deposited Pb film, react with Pb, and form Pr x Pb y intermetallic compounds. Furthermore, the electrolytic products formed by galvanostatic electrolysis were characterized by scanning electron microscopy coupled with energy dispersive X-ray diffraction, which illustrated the formation of PrPb 3 intermetallic compound in LiCl-KCl-PbCl 2 -PrCl 3 melt.
研究领域:
化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Chen-Xuan Li,Chang-Bin Chen,Yun-Jie Wang,Xian-Zhong Fu,Shuo Cui,Jia-Yuan Lu,Jie Li,Hou-Qi Liu,Wen-Wei Li,Tai-Chu Lau
The formation of halogenated disinfection byproducts (DBPs) during organic pollutants degradation in advanced oxidation processes (AOPs) has raised growing concerns globally. However, the detailed roles of chlorine ions (Cl − ) in pollutant degradation by peroxymonosulfate (PMS) alone remain controversial so far. Here, we shed light on the PMS-Cl − -phenol interactions and revealed a previously overlooked pH-dependent phenol transformation pathway. At acidic pH, Cl − significantly accelerated the phenol removal. The Cl − -PMS reaction resulted in abundant reactive chlorine species, which attacked phenol to form 4-chlorophenol and 2, 4-dichlorophenol as the main transformation products. In contrast, the impact of Cl − became negligible at alkaline pH. Raising the pH severely suppressed the phenol chlorination and significantly stimulated generation of singlet oxygen ( 1 O 2 ) for degradation of phenol and the minor formed chlorophenols. The 1 O 2 was resulted from a combined effect of PMS self-decomposition and PMS-benzoquinone interaction at alkaline pH. Our results imply a previously-underestimated impact of Cl − on phenolic compounds degradation in PMS-based AOPs and underscore a potential risk of chlorinated DBPs formation under environmental conditions.
研究领域:
环境科学
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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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2019
·
IF 8.355
Guilin He,Tuqiao Zhang,Feifei Zheng,Cong Li,Qingzhou Zhang,Feilong Dong,Yuan Huang
Fleroxacin (FLE) is an emerging third-generation fluoroquinolone antibacterial agent (FQs) that has been frequently detected in aqueous environments. However, there is a lack of sufficient knowledge regarding the transformation mechanisms of FLE within drinking water distribution systems (DWDSs) when residual chlorine and ClO 2 are present. To address this gap, this study makes the first attempt to explore the kinetics, transformation byproducts and toxicity variations during fleroxacin (FLE, an emergent pollutant) degradation by chlorine and ClO 2 in a pilot-scale DWDSs. The obtained results show that (i) the FLE degradation rate by chlorine was higher than by ClO 2 at pH 7.4 in the pilot-scale DWDSs; (ii) the degradation efficiency of FLE was significantly affected by pH, with FLE degradation by chlorine possessing the highest rate at neutral pH, and the degradation rate was positively correlated with pH (from 6.5 to 9) during the ClO 2 disinfection process; (iii) pipe materials can appreciably affect the relative performance of the FLE degradation efficiency by chlorine and ClO 2 ; (iv) seven and eight intermediates are identified during chlorination and ClO 2 oxidation, respectively, and the cleavage of the piperazine group was the committed step and the main oxidation reaction, and (v) the toxicity assessment demonstrates that the toxicity of FLE chlorination and ClO 2 are both higher than the blank experiment, and ClO 2 disinfection can reduce the potential risk compared to the chlorine disinfection.
研究领域:
环境科学
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公共卫生
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2021
·
IF 8.071
Na Liu,Qing Hu,Chao Wang,Lizhi Tong,Chih-Huang Weng,Longzhen Ding
This study demonstrated that nitrogen-doped carbon materials (NCMs) could effectively catalyze the chlorine elimination process in hexachloroethane (HCA) declorination in sulfide-containing environments for the first time. The k obs values of HCA dechlorination by sulfide in the presence of 10 mg/L NCMs were higher than that of no mediator at pH 7.3 by one or two orders of magnitude. The catalytic capabilities of NCMs on HCA dechlorination were evident in common ranges of natural pH (5.3–8.9) and it could be accelerated by the increase of pH but be suppressed by the presence of dissolved humic acid . Moreover, NCMs exhibited much better catalytic capability on HCA dechlorination compared to the carbon materials, mainly owing to the combined contributions of pyridine N, including enhanced nucleophilic attack to HCA molecule by generating newborn C–S–S and activation of HCA molecule by elongating C–Cl bonds. The functions of pyridine N in micron-sized NCMs with mesopores were better than in nano-sized NCMs on HCA dechlorination. These findings displayed the potential of NCMs, when released into sulfide-containing environments, may significantly increase the dechlorination of chlorinated aliphatic hydrocarbons.
研究领域:
环境科学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2014
·Vol. 119
·期 1
·597-603
·
IF 2.206
Xu Xiaopeng,Chen Si,Wu Bozhen,Ma Meng,Shi Yanqin,Wang Xu
The influence of allantoin (ALL) combined with zinc stearate (ZnSt 2 ), calcium stearate (CaSt 2 ), and ZnSt 2 –CaSt 2 (1:1), respectively, in different mass ratios on thermal stability of poly(vinyl chloride) (PVC) was investigated by Congo red test, discoloration test, and thermogravimetric analysis. The results indicated that ALL behaved as a good long-term thermal stabilizer for PVC, which was attributed to its ability to absorb hydrogen chloride released from the degradation of PVC. Moreover, ALL was able to extend the stabilization time of PVC containing ZnSt 2 –CaSt 2 and postpone “zinc burning.” Fourier transform infrared spectra confirmed that ALL can react with ZnCl 2 to produce an inert complex, which is responsible for postponing “zinc burning.”
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
CHEMOSPHERE
·
2015
·
IF 3.34
Yunfei Zhang,Bo Yang,Yanni Han,Chaojin Jiang,Deli Wu,Jinhong Fan,Luming Ma
In this work, we tested a novel iron metal matrix composite (MMC) synthesized by mechanically introducing quartz sand (SiO 2 ) into an iron matrix (denoted as SiO 2 –Fe MMC). The pseudo-first-order reaction rate constant of the SiO 2 –Fe MMC (initial pH 5.0) for 20 mg/L of 2-chlorophenol (2-CP) was 0.051 × 10 −3 L/m 2 /min, which was even higher than that of some reported Pd/Fe bimetals. This extraordinary high activity was promoted by the quick iron dissolution rate, which was caused by the formation of Fe–C internal electrolysis from carbonization of process control agent (PCA) and the active reinforcement/metal interfaces during the milling process. In addition, pH has slight effect on the dechlorination rate. The SiO 2 –Fe MMC retained relatively stable activity, still achieving 71% removal efficiency for 2-CP after six consecutive cycles. The decrease in dechlorination efficiency can be attributed to the rapid consumption of Fe 0 . A dechlorination mechanism using the SiO 2 –Fe MMC was proposed by a direct electron transfer from Fe 0 to 2-CP at the quartz sand/iron interface.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOM
·
2021
·Vol. 74
·期 1
·213-221
·
IF 2.474
Deng Pan,Li Liang,Jia Yaoqiang,Liu Dachun,Jiang Wenlong,Kong Lingxin
Aluminum chloride (AlCl 3 ) is an effective chlorinating agent and catalyst for the chlorination of low-grade titanium slag to produce titanium tetrachloride in molten salts. In this paper, the chlorination behavior of low-grade titanium slag by anhydrous AlCl 3 in AlCl 3 -NaCl molten salt was investigated. Thermodynamic analysis revealed that aluminum chloride can be an effective agent for low-grade titanium slag, and that the addition of NaCl can form a compound molten salt together with AlCl 3 to prevent the evaporation of AlCl 3 .chlorination experiments were conducted on low-grade titanium slag in AlCl 3 -NaCl molten salt to investigate the effects of temperature and the amounts of aluminum chloride and sodium chloride added. Under optimized experimental conditions, the selective separation of titanium from the titanium slag was effectively achieved, and the extraction rate of titanium reached 79.6%. Other impurity elements in the form of oxides or chlorides remained in the residue. Finally, a reaction mechanism for the extraction of titanium from low-grade titanium slag in AlCl 3 -NaCl molten salt has been proposed.
研究领域:
冶金学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Ziyu Zhuang,Dongdong Li,Jinshun Lei,Dandan Gao,Dewen Zeng
Highly concentrated boron is widespread in salt lake brine and nuclear wastewater. Treatment of these aqueous solutions involves the solubility of extensive boron-containing minerals. Recently, we concentrated on the temperature-dependent solubility of the H3BO3 + salt + water system. Here, we systematically determined the ternary solubility isotherms in the H3BO3 + RbCl + H2O and H3BO3 + NH4Cl + H2O systems at T = (273.15, 298.15, 323.15, 348.15 and 363.15) K, using an isothermal equilibrium method. The results showed that both ternary systems belonged to a simple eutectic case. The solubility isotherms consisted of the solubility branches of H3BO3(cr) and RbCl(cr) or NH4Cl(cr). Using a revised Pitzer–Simonson–Clegg (rPSC) model implemented in the ISLEC software, these ternary solubility data were represented by fitting the interaction parameters between H3BO3 and RbCl and H3BO3 and NH4Cl. With the help of these models, polythermal phase diagrams of the two ternary systems are predicted.
研究领域:
化学
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环境科学
✓ 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）