ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2020
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IF 7.864
Meihui Ren,Haijun Zhang,Yun Fan,Dan Wang,Rong Cao,Yuan Gao,Jiping Chen
Thiourea can effectively inhibit the formation of highly toxic chlorinated aromatics in postcombustion zone. However, the inhibition mechanism was still not adequately understood. In this study, naphthalene was adopted as a model aromatic compound to investigate the inhibition effect and mechanism of thiourea on the formation of chlorinated aromatics via electrophilic chlorination over Cu and Fe chlorides. Thiourea addition resulted in the reductions of 77.6–99.8% and 36.4–98.1% in the yield of polychlorinated naphthalenes from naphthalene chlorination mediated by CuCl2 and FeCl3 at 150–300 °C, respectively. The inhibition efficiency of chlorination presented a decreasing tendency with increasing reaction temperature and O2 content in flue gas. X-ray diffraction analysis revealed that the thiourea-induced reduction of highly active Cu (II) and Fe (III) chlorides to less active Cu (I) and Fe (II) chlorides was a primary mechanism for inhibiting aromatic chlorination. [thiourea–Cu]+ complex generated during the reduction process could be transformed into CuS and Cu2S, and isomeric reaction product NH4SCN could react with Cu2+ to produce Cu(SCN)2 and then also form Cu sulfides, suggesting sulfidization of Cu chloride was another important inhibition mechanism. Chlorination inhibition induced by the volatile decomposition products of thiourea might only play a minor role.
研究领域:
环境科学
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化学工程
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催化
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燃烧化学
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产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
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2020
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IF 7.246
Hongping He,Mei Sun,Deli Wu,Guanglan Di,Xunchang Fei
Heterogeneous Fenton dominated by ·OH is limited in its application, as pre-acidification is required to maximize the generation amount and redox potential of ·OH. It is thus featured to consume resources and generate pollutants. In this study, both CuS/H 2 O 2 and Cu 2 S/H 2 O 2 are found to show better performances under close-to-neutral condition (pH 5.0 to 9.0) than acidic condition (pH 3.0) when degrading a model contaminant, sulfamethazine (SMZ), because ·OH does not play a major role in both systems. The Cu valence-dependent catalytic mechanisms are responsible for the varied kinetics between CuS/H 2 O 2 and Cu 2 S/H 2 O 2 . In CuS/H 2 O 2 , Cu(III) and 1 O 2 contribute to the SMZ degradation, and their contributions are pH-dependent. In Cu 2 S/H 2 O 2 , Cu(III) is responsible for the degradation regardless of the pH. Both systems with optimal performances under neutral condition are advantageous as pre-acidification can be avoided. In addition, air sparging induces additional 16% SMZ degradation in Cu 2 S/H 2 O 2 under acidic condition, because the sparged O 2 reacts with dissolved Cu(I). The more O 2 reacts with the dissolved Cu(I), the less generated Cu(III) is ineffectively depleted. Air sparging is readily applicable to different operations, thus its combination with Cu 2 S/H 2 O 2 potentially benefits the development of environmentally-friendly treatment process for industrial wastewater .
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
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2024
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IF 6.7
Mengfan Mao,Yexin Zu,Yating Zhang,Yongzhen Qiu,Yue Lin,Fang Luo,Zuquan Weng,Cuiying Lin,Bin Qiu,Zhenyu Lin
Halide perovskites have emerged as a highly promising class of photoelectric materials. However, the application of lead-based perovskites has been hindered by their toxicity and relatively weak stability. In this work, a composite material comprising a lead-free perovskite cesium copper iodide (CsCu2I3) nanocrystal and a metal–organic framework (MOF-801) has been synthesized through an in situ growth approach. The resulting composite material, denoted as CsCu2I3/MOF-801, demonstrates outstanding stability and exceptional optoelectronic characteristics. MOF-801 may serve a dual role by acting as a protective barrier between CsCu2I3 nanocrystals and the external environment, as well as promoting the efficient transfer of photogenerated charge carriers, thereby mitigating their recombination. Consequently, CsCu2I3/MOF-801 demonstrates its utility by providing both stability and a notably high initial photocurrent. Leveraging the inherent reactivity between H2S and the composite material, which results in the formation of Cu2S and structural alteration, an exceptionally sensitive photoelectrochemical sensor for H2S detection has been designed. This sensor exhibits a linear detection range spanning from 0.005 to 100 μM with a remarkable detection limit of 1.67 nM, rendering it highly suitable for precise quantification of H2S in rat brains. This eco-friendly sensor significantly broadens the application horizon of perovskite materials and lays a robust foundation for their future commercialization.
研究领域:
材料科学
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分析化学
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环境科学
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生物传感器
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
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2025
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IF 7.7
Sainan Sun,Jiahong Pan,Jialu Pan,Xinyi Shen,Jiahui Liu,Ziyi Guo,Chenyi Wang,Yanqing Cong,Shi-Wen Lv
Nowadays, water pollution issues caused by antibiotics and heavy metals have become a focus of global concern, and it is greatly significant to develop effective methods to remove heavy metal and organic contaminant from wastewater. Herein, newly-designed Cu 2 S/ZnIn 2 S 4 p-n heterojunction with internal electric field is constructed by using epitaxial growth strategy. Importantly, lattice well-matched heterointerface between Cu 2 S and ZnIn 2 S 4 presents very low charge transfer resistance. Under the mediation of internal electric field, the generation and separation of photogenerated carriers are effectively improved, and the formation of hollow structure enhances visible light absorption capability. Benefiting from these changes, photogenerated electrons and holes can be directly involved in tetracycline (TC) degradation and Cr(VI) reduction, avoiding intermediate reaction processes. Under visible light illumination, thus, Cu 2 S/ZnIn 2 S 4 composite shows superb performance in the treatment of wastewater containing both antibiotic and Cr(VI). The removal efficiencies of TC and Cr(VI) are as high as 96.7 % and 94.1 % within 32 min, respectively. Interestingly, Cr(VI) reduction over Cu 2 S/ZnIn 2 S 4 is a stepwise process, and Cr(VI) is first reduced to Cr(V) and then transformed into Cr(III). Notably, Cr(V) with strong oxidation ability as transition intermediate can further promote antibiotic degradation.
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2025
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IF 2.5
Zhenglong Zhou,Dinghan Liu,Bing Yang,Jigang Wu,Rui Li
Cadmium indium sulfide (CdIn2S4), a widely used n-type semiconductor, has been considered a promising photoanode material for photoelectrochemical (PEC) water splitting due to its excellent light response characteristics and suitable energy levels. However, its application in the PEC field is limited by rapid carrier recombination on the surface and severe photocorrosion phenomena. In this study, a novel strategy is proposed by loading Cu2S onto the surface of CdIn2S4 via an ultrasound-assisted method to modify the CdIn2S4 photoanode. As a p-type semiconductor, Cu2S forms a p–n heterojunction with CdIn2S4, creating an internal electric field that facilitates charge transport. Additionally, the Cu2S overlayer acts as a cocatalyst, enhancing the surface reaction kinetics and improving the charge injection efficiency at the photoelectrode/electrolyte interface. The incorporation of Cu2S also reduces the photocorrosion on the CdIn2S4 surface. Experimental results demonstrate that the optimal Cu2S/CdIn2S4 photoanode exhibits a photocurrent of up to 0.3 mA cm−2 at 1.23 V versus the reversible hydrogen electrode, approximately ten times higher than that of bare CdIn2S4. This work offers an effective approach to modulate carrier dynamics, thereby enhancing the PEC performance of photoanodes.
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Xinpeng Liu,Baohua Wang,Xiaoli Lv,Qingmei Meng,Menghong Li
The H 2 S removal performances of four deep eutectic solvent (DES) based nanofluid (NF) systems were measured using dynamic absorption experiment. The Cu containing NF system is found to be an excellent absorbent for H 2 S removal with a significantly enhanced desulfurization performance compared with DES original solution. Besides, the NF systems have relatively high regeneration performance. The NF systems and Cu nanoparticles before and after absorption as well as after regeneration were characterized by Fourier transform infrared (FT-IR) spectra, scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmission electron microscope (TEM) and energy dispersive spectrum (EDS). It is found that the ethanolamine , choline cation and sulfur were accumulated on the surface of Cu nanoparticles after absorption, and the bulk elements on the surface were identified as Cu and S after regeneration. The S −2 was existed in the form of Cu 2 S, and some sulfur was oxidized to zero-valent sulfur after regeneration.
研究领域:
环境科学
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化学工程
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
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