Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Ge Zhang,Huifen Yang,Tong Zhao,Xuan Li,Yichen Zhou,Song Guo
The thermal adsorption residue (TDR) from oil sludge co-contaminated soil was employed to remove As(III), Zn(II), Cu(II), Cd(II) in aqueous solution. The results showed that the TDR could efficiently neutralize the acid and adapt to the extensive pH. The adsorption of four heavy metals on TDR could be divided into three stages. The maximum adsorption capacity were 86.59, 249.07, 339.88, 322.86 mg·g −1 for As(III), Zn(II), Cu(II), Cd(II), respectively. The coexistence of Zn(II)/Cu(II)/Cd(II) could promote As(III) removal but As(III) led to decreasing of Zn(II)/Cu(II)/Cd(II) adsorption capacity in binary system. There was a significant competitive adsorption on TDR among the three cations which followed the selectivity sequence of Cu(II)>Zn(II)>Cd(II). The SEM-EDS, XRD, FTIR and XPS analyses demonstrated that the As(III) was removed via formation of Ca-As precipitation, and the Zn(II), Cu(II), Cd(II) were removed through precipitating as hydroxides/carbonates/silicates combining with ion exchange. Specially, the Cu(II) mainly precipitated in the form of Cu 4 (SO 4 )(OH) 6 ⋅2H 2 O and Cu 4 (OH) 6 SO 4 under sulfuric acid solution environment. Overall, this study indicates the potential of TDR as a cost-effective adsorbent in acid heavy metals contaminated wastewater treatment .
研究领域:
环境科学
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土壤修复
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
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IF 10.652
Yiyi Li,Xuelei Duan,Weiguo Song,Linge Ma,Jinder Jow
The reaction mechanisms of potassium glycine (KG)–CO 2 absorption, thermal desorption and mineralization desorption with CaO were studied based on the contents of carbamate, bicarbonate/carbonate, and KG/protonated KG analyzed by 13 C-quantitative nuclear magnetic resonance ( 13 C qNMR). KG as the absorbent shows the CO 2 absorption efficiency up to 76% which has 57% due to the bicarbonate/carbonate formation and 43% due to the carbamate formation. Mineralization has a higher CO 2 desorption efficiency of 59% than that of thermal desorption (47%), and the results also indicate that carbamate is less stable under mineralization than under heat although both processes show the similar profiles as a function of pH value for carbamate and bicarbonate/carbonate. A new mechanism has been proposed to explain carbamate increasing with significantly decreasing bicarbonate/carbonate at the early stage of mineralization desorption while the other mechanisms reported in literatures have also been confirmed in this study.
研究领域:
化学工程
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环境科学
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Kaineng Huang,Yi He,Xingyu Li,Yuanjiang Pan,Yuanji Gao
Herein, a new strategy is employed to build a controllable thermal-coupled charge ionization (TCCI) device to elucidate the desorption–ionization mechanism of plasma ion sources. Efficient synergistic desorption and ionization are achieved within the TCCI device by independently controlling the desorption temperature and plasma charges. The TCCI device efficiently ionizes samples using abundant free electrons, charges, and active species from arc plasma. The coexistence of free electrons and hydroxide radicals confers redox capability to the TCCI system, implying the presence of a unified redox mechanism even when the arc plasma is transmitted through a metal conductor over a distance. In addition, molecular ions of the analytes facilitate the differentiation between primary and secondary amines during their analysis. Notably, the TCCI device enables a switch between hard and soft ionization by adjusting the thermal desorption temperature. At high temperatures (>400 °C), the TCCI device exhibits hard ionization characteristics, producing fragment ions beneficial for isomer discrimination. The TCCI mass spectrometry exhibits robust performance in terms of sensitivity and accuracy for detecting antibiotics and sterols in saline solutions, achieving linearity with correlation coefficients ≥0.99 and excellent reproducibility. The successful analysis of seven pharmaceuticals and four sterols in complex matrices using the TCCI device demonstrates its excellent salt and matrix tolerance. Overall, the TCCI device, with its independent control over thermal desorption and arc plasma, achieves efficient synergistic desorption and ionization, overcoming limitations in existing ionization technologies and contributing to the study of gas-phase ion dynamics and mechanisms.
研究领域:
分析化学
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质谱学
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等离子体科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2025
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IF 6.1
Sifang Wu,Feng Xu,Yong Wu,Chenlu Wang,Wenqing Gao,Renlu Han,Jiancheng Yu,Keqi Tang
Portable mass spectrometers have played an important role in the rapid field detection of drugs; however, interference from matrix components, such as salts, solvents, and other metabolites, often leads to high rates of false positives and false negatives, making it challenging to meet the requirements for rapid field detection. To mitigate these challenges, a solvent-assisted thermal desorption ionization source has been developed, which enables rapid screening, improved accuracy and quantitative MS analysis. This ionization source is designed to allow the introduction of sample solution into the thermal desorption chamber with coaxial solvent and gas flows. The sample is introduced into a closed high-temperature thermal desorption chamber by the coaxial gas flow, where it is rapidly vaporized, enabling a concentrated ionization and avoiding chemical interferences from the environment. The use of both a solvent flow and a guiding gas flow in the new ion source design effectively reduces the sample deposition on the inner surface of the glass liner in the thermal desorption chamber and minimize cross contamination and the interferences from salts in the sample, a significant 1.8–5 fold enhancement in the signal intensity of the drug was observed, and accommodates a large sample volume injection for a significantly increased sensitivity, repeatability, and accuracy of MS detection. By integrating this novel solvent-assisted thermal desorption ionization source with a portable mass spectrometer and employing a selected ion monitoring (SIM) mode, the linear dynamic ranges of detection for ketamine, cocaine, and morphine in the hair matrix have shown to be 1–20 ng/mg, with R 2 > 0.99. The recovery rates for the three tested illicit drugs are all within the range of 92.28 %–104.66 %. Both intra-day and inter-day precision remain to be below 10 %, indicating high measurement accuracy and stability. The limit of detection (LOD) for ketamine, cocaine, and morphine at 0.2 ng/mg has also been achieved, which is significantly better than those by using conventional methodologies. The technique developed through this study provides a reliable tool for in situ rapid analysis of illicit drugs in hair.
研究领域:
分析化学
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法医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
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IF 9.038
Chuyuan Huang,Xianfeng Chen,Bihe Yuan,Hongming Zhang,Sheng Shang,Qi Zhao,Huaming Dai,Song He,Ying Zhang,Yi Niu
Flame propagation characteristics of wood dust deflagration and suppression mechanism of ultrafine powders are investigated systematically. The deflagration reaction intensity of wood dust increases firstly and then decreases with the increase in dust cloud concentration. This is due to factors such as oxygen supply, positive feedback among flame characteristic parameters. Thus, there is an equivalent dust concentration for greatest deflagration intensity. Nano-sized ultrafine zirconium hydroxide (Zr(OH) 4 ) and silicon dioxide (SiO 2 ) powder are introduced to suppress wood dust deflagration at the equivalent concentration. It is found that Zr(OH) 4 has a suppression effect of endothermic decomposition to generate zirconia (ZrO 2 ), dilution of oxygen and absorption of free radicals; while SiO 2 exerts suppression effect due to its high melting point and heat absorption. The suppression performance of Zr(OH) 4 is better than that of SiO 2 . This is because that Zr(OH) 4 and ZrO 2 have a catalytic carbonization effect. It can not only improve thermal stability of wood particles by catalyzing production of high-temperature resistant residuals, but also promote the formation of catalytic sites to reduce crystallite size of carbon layer on wood particles surface, weakening heat and mass transfer between particles.
研究领域:
安全工程
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燃烧学
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粉尘爆炸防控
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材料化学
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热力学
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2025
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IF 6.7
Mingze Jiao,Jia Chen,Lulu Yang,Qinyuan Hong,Yiqi Feng,Wenjun Huang,Bing Pei,Qianxuan Zhang,Qingyan Fu,Zan Qu,Naiqiang Yan,Haomiao Xu
Accurate detection of trace atmospheric mercury is critical for toxicological assessment and environmental protection. However, achieving parts per billion-level sensitivity with high selectivity between gaseous elemental mercury (Hg0) and oxidized mercury (Hg2+) remains a significant challenge. Here, we present a novel dual-channel enrichment trap system that selectively captures Hg0 by using a layered Au-MXene (Ti3C2Tx) composite as the sorption trap. This composite demonstrates exceptional selectivity for Hg0, with a selectivity ratio of up to 76.7 over Hg2+, and achieves 99.7% ± 0.3% (n = 3) sorption efficiency for ppb-level Hg0 within 30 min at room temperature. Complete desorption is achieved in just 90 s at 300 °C, demonstrating a response time of 45 s for Hg0 detection through the dual-electrothermal Hg0 channel. The Au–Ti3C2Tx preconcentration cartridge exhibits excellent moisture resistance, high-temperature stability, and long-term durability. Density functional theory (DFT) calculations reveal that the built-in electric field at the Au–Ti3C2Tx interface accelerates electron transfer, reducing preconcentration and regeneration times. This technology integrates seamlessly with the cold vapor atomic absorption spectrophotometer (CVAAS) method to form a mercury dual-channel continuous emission measurement system (Hg DCEMS), ensuring highly selective and precise trace Hg0 detection. This advancement provides a device for accurately measuring the Hg0 concentration, enabling better mercury pollution control.
研究领域:
环境分析化学
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大气污染控制
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材料科学
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传感器技术
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重金属检测
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TOXICOLOGICAL AND ENVIRONMENTAL CHEMISTRY
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2019
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IF 0.971
Ronghui Yuan,Fang Huang,Jun Jiang,Jinfei Huang,Chang Su
Simulated with small environmental chambers, the emission characteristics of total volatile organic compounds from plastic runway surfaces were investigated by thermal desorption–gas chromatography–mass spectrometry. This quantitative approach was validated using a dynamic recovery experiment, and the variation of emission factors from mixed-type plastic surfaces was determined. Also, the photodegradation of volatile organic compounds in chambers was introduced to decrease the background interference.
研究领域:
环境科学
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分析化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Wenwen Zhang,Xiaodong Li,Jialun Shen,Zongquan Sun,Xuefei Zhou,Fasheng Li,Fujun Ma,Qingbao Gu
In-situ thermal desorption (ISTD) has attracted increasing attention owing to the efficient removal of organic contaminants from contaminated sites. However, it is poorly understood that whether and to what extent contamination degradation occurs upon oxygenation of reduced Fe-bearing clay minerals (RFC) in the subsurface during ISTD. In this study, we evaluated the mechanism of contaminant degradation upon oxygenation of reduced clay minerals during the ISTD. Reduced nontronite (rNAu-2) and montmorillonite (rSWy-3) were selected as RFC models. Results showed that thermal treatment during ISTD could significantly enhance phenol degradation, which increased from 25.8 % at 10 °C to 74.4 % at 70 °C in rNAu-2 and from 17.7 % at 10 °C to 49.8 % at 70 °C in rSWy-3. Correspondingly, the cumulative •OH at steady-state ([•OH] ss ) increased by 3.7 and 1.5 times, respectively. The acceleration of Fe(II) oxidation with increasing temperature could be mainly responsible for [•OH] ss generation, which degrades phenol. Moreover, thermal treatment improved the fast oxidation of trioctahedral entities Fe(II)Fe(II)Fe(II) (TOF) and the slow oxidation of dioctahedral entities Fe(II)Fe(II) (DTF 1 ), AlFe(II) (DAF 1 ), and Fe(II)Fe(III) (DTF 2 ). Our study suggests that the overlooked degradation progress of phenol by oxygenation of RFC during ISTD, and it could be favorable for contaminant degradation during remediation.
研究领域:
环境科学
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化学工程
·
土壤化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CONTAMINANT HYDROLOGY
·
2021
·
IF 3.188
Jia Li,Changfan He,Xingtao Cao,Hong Sui,Xingang Li,Lin He
The efficiencies of thermal desorption and oxidation process in engineering soil remediation are to some extent limited due to the huge loss of heat to the soil or underground water or mass transfer resistance in the soil. To enhance the oxidation and improve the energy utilization. Herein, the thermal desorption process and the oxidation process (by ozone) are combined together to remediate the organic contaminated model soil (take the 2,4-dimethylaniline (2,4-DMA) as pollutant). Results show that this hybrid process could not only reduce the thermal desorption temperature (as low as 50–90 °C), but also improve the oxidation efficiency significantly, even achieving 100% degradation of 2,4-DMA in less than 10 min in the soil. It is found that the remediation efficiency by the hybrid process is also highly dependent on different operational parameters, including the heating temperature, ozone concentration, especially the moisture content in the soil. The results suggest that a proper content of water in the soil is beneficial for the degradation of pollutants by the hybrid process. Finally, the degradation kinetics and mechanisms of 2,4-DMA in the soil by the hybrid process has been primarily discussed. These findings suggest that the low temperature enhanced chemical oxidation process would be a promising method for future remediation of organic contaminated soil due to its relatively low energy consuming and high removal efficiency in shorter time.
研究领域:
环境工程
·
土壤学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Sheng Li,Xin Yu,Liming Liu,Liqin Zhou,Zhaowei Jia,Jianmin Chen,Zhongxing Zhao,Zhenxia Zhao
Synchronous boosting adsorption and desorption efficiency is a great challenge for CO 2 adsorption capture, especially for metal–organic frameworks (MOFs) having high adsorption uptakes. Herein, a novel “self-supporting foam” strategy is proposed to fabricate a thermally conductive MOFs@boron nitride nanosheets (BNNS) composite foam (MOFs@BNNS-PEI) via polyethyleneimine (PEI) cross-linkage. The “rebar” BNNS and the “aggregate” MOFs are packed against each other to form a self-supporting structure, effectively reducing the reliance on polymers to maintain high MOFs loading. Furthermore, this approach enables the successful fabrication of three different types of typical MOFs, including HKUST-1, MIL-100(Fe), and ZIF-8. This unique design maintains a high specific surface area (SSA) of the MOFs foam and generates nitrogen-rich microporosity contributing to CO 2 adsorption. Additionally, PEI serves as a thermal bridge to reduce the interfacial thermal resistance between BNNS and MOFs, accelerating the thermal desorption of CO 2 within the MOFs foam. Benefiting from these advantages, the MOFs@BNNS-PEI exhibits a higher CO 2 adsorption capacity (1.35–1.42 times that of pure MOFs) and a significant increase in the desorption rate for CO 2 (5.0–5.7 times that of pure MOFs). Thus, the thermally conductive MOFs foam can be a viable option for efficient CO 2 capture in practical applications.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Zhixin Chen,Yijie Wang,Liming Hu
Thermal desorption technology can effectively remediate fuels-contaminated clayey soil. However, the microscopic mechanism for the contaminant desorption on clay is still unclear, especially with the existence of water on clay surfaces. In this study, a combination method including TGA experiments, multi-phase and multi-component kinetic models, and MD simulation was proposed to reveal the thermal desorption mechanism of n -dodecane in unsaturated clay. Results showed that the thermal desorption behavior of the free nonaqueous phase liquid (NAPL) and the adsorbed phase of n -dodecane or water could be identified by the multi-phase and multi-component kinetic models based on the desorption process rate obtained by thermogravimetric analysis (TGA) experiments. The activation energy of the NAPL phase (49–69.9 kJ/mol) was lower than the adsorbed phase (90 kJ/mol). The activation energy of the NAPL phase had the same linear relationship with its mass on kaolinite and montmorillonite , while adsorbed phase only existed on the kaolinite surface. MD simulation showed that water demonstrated competitive adsorption with n -dodecane on montmorillonite surfaces and prevented the formation of the adsorbed phase while having little influence on the n -dodecane adsorption on kaolinite surface, which agrees well with the kinetic analysis of the TGA experiments. With the combination of macroscopic experimental analysis and microscopic molecular simulation, it can be concluded that the mass of the NAPL phase limited the desorption behavior, while the interaction between the clay mineral surface and n -dodecane was the key factor that dominated the thermal desorption behavior of the adsorbed phase. The presented results provide new insight into the desorption mechanism of hydrocarbon on clay minerals, which is of significance for the design of thermal desorption remediation.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Yipeng Liu,Rui Feng,Yuyao Zhao,Xiaoya Guo,Jinghan Ding,Sibi Liu,Yijin Wang,Jinmeng Zhu,Xuanhua Li
Solar-driven sorption-based atmospheric water harvesting (SS-AWH) offers promise for addressing global freshwater scarcity. However, the SS-AWH heavily relies on favorable and sustained solar irradiation; yet real-world solar irradiation exhibits significant spatiotemporal fluctuations, limiting its sustainable application, as non/low-light conditions sharply reduce water productivity. This constraint is fundamentally due to the singleness of the water release pathway via photothermal desorption. Here, a novel dual-mode bio-based Janus aerogel (DBJA) is presented, enabling efficient, all-weather, multi-scenario atmospheric water harvesting via selectively solar-driven and compression-activated water release. The Janus structure optimizes mass/heat transfer between hygroscopic and photothermal domains, achieving the most balanced adsorption–desorption kinetics and compression-recovery strength for solar-mechano symbiosis. Under favorable sunlight, DBJA demonstrates a competitive water release efficiency of 1.32 g g −1 day −1 outdoors. Crucially, without solar irradiation, DBJA achieves a total water productivity of 12.80 g g −1 over 5-cycle adsorption-compression with 98% volume recovery and is stable within 50 cycles. Enhanced physical inlay and multiple chemical interactions ensure limited leakage of Li + ions during compression, and the collected water easily conforms to the World Health Organization (WHO) drinking water standards. This work provides a flexible approach for sustainable atmospheric water harvesting beyond solar reliance through multi-mode synergy and gradient architecture.
研究领域:
材料科学
·
环境工程
·
化学工程
·
可再生能源
·
纳米技术
·
可持续技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）