JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Zhisheng Li,Chaoqi Hao,Chuantong Cheng,Zhaowei Zhu,Mengjie Zhang,Yuehua Li,Liting Huang,Bao Zhang,Xu Zhang
s HgTe quantum dots (QDs) are promising for infrared optoelectronic applications due to their size-tunable bandgap and solution-processable nature. However, conventional synthesis methods often result in aggregation and instability, limiting their practical use. This study presents a strategy to improve the dispersibility of HgTe QDs by using mercuric iodide (HgI₂) as the mercury precursor and 3-mercaptopropionic acid (MPA) in combination with oleic acid as the ligands during the quenching stage. Comparative experiments showed that MPA-treated QDs exhibited improved dispersion, with a reduced hydrodynamic diameter (~135 nm) compared to those without MPA (~180 nm). Additionally, photoconductive devices fabricated with MPA-treated QDs demonstrated significantly better performance. These devices exhibited higher switching ratios and responsivity, reflecting the improved dispersion and surface stabilization of the QDs, which enhanced charge transport efficiency and reduced recombination losses. This work provides an effective approach for controlling dispersion and enhancing the performance of HgTe QDs for infrared optoelectronics.
研究领域:
材料科学
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纳米科技
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半导体物理
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光电功能材料
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胶体化学
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
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2024
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IF 6.3
Zhenggang Huang,Chuanming Zhang,Chunyang Shen,Lili Jin,Yaxiong Zeng,Baohong Guan
Ammonia nitrogen (NH 4 + -N) is one of the regular indexes and the most important contaminants in drinking water. However, it is still a great challenge to remove low concentration NH 4 + -N from drinking water in a safe way. Here we used NaX zeolite and alkali-modified NaX zeolite (NaX-A) as adsorbents and catalysts for ozonation to remove NH 4 + -N in water without adding any chemicals. The zeolites present significant adsorption of NH 4 + -N with Freundlich adsorption affinity of 2.10–3.27 mg 1-n ·L -n ·g −1 by ion-exchange on the bridged Si-O-Al groups. The NaX-A catalytic ozonation achieves 26.7 % of NH 4 + -N removal and up to 75.0 % of gaseous products selectivity in 20 min. The NH 4 + -N oxidation rate constant is raised by 10.7 times over O 3 /NaX-A compared with single ozonation. The alkali modification stimulates the formation of acid sites in NaX-A, and thus improve the adsorption of NH 4 + -N and the decomposition of O 3 into hydroxyl radicals (·OH) for the conversion of NH 4 + -N to gaseous products. This study provides new insights into catalytic ozonation by alkali-modified zeolites to remove NH 4 + -N in water via coupling adsorption with catalytic ozonation.
研究领域:
环境科学
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化学工程
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水处理技术
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产品关联
DOI
高影响因子
Journal of Environmental Sciences
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2024
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IF 5.9
Fengjiao Quan,Guangming Zhan,Pengfei Xu,Xiaolan Chen,Wenjuan Shen,Falong Jia,Yun He,Jianfen Li
Nitrate (NO 3 – ) is a widespread pollutant in high-salt wastewater and causes serious harm to human health. Although electrochemical removal of nitrate has been demonstrated to be a promising treatment method, the development of low-cost electro-catalysts is still challenging. In this work, a phosphate modified iron (P-Fe) cathode was prepared for electrochemical removal of nitrate in high-salt wastewater. The phosphate modification greatly improved the activity of iron, and the removal rate of nitrate on P-Fe was three times higher than that on Fe electrode. Further experiments and density functional theory (DFT) calculations demonstrated that the modification of phosphoric acid improved the stability and the activity of the zero-valent iron electrode effectively for NO 3 – removal. The nitrate was firstly electrochemically reduced to ammonium, and then reacted with the anodic generated hypochlorite to N 2 . In this study, a strategy was developed to improve the activity and stability of metal electrode for NO 3 – removal, which opened up a new field for the efficient reduction of NO 3 – removal by metal electrode materials .
研究领域:
环境科学
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电化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2024
·
IF 2.3
Xu Pengfei,Ma Haiming,Shen Wenjuan,Quan Fengjiao,Li Jianfen,He Yun
Ammonia (NH 3 ) can be used as a fertilizer, a chemical or a new generation of fuel and has important agricultural and industrial value. Electrochemical NO 3 – -to-NH 3 (NITRR) can realize the conversion of waste into treasure and waste resources, which is a promising method for ammonia synthesis. However, the process of NITRR is very complicated, resulting in product diversification and poor selectivity. In this work, an iron modified cerium oxide in rod form (Fe/CeO 2 -rod) catalysts was designed and used for the NITRR. The Fe/CeO 2 -rod catalyst showed excellent activity, and achieves high Faradaic efficiency (FE 95%) and NH 3 yield rate (4.04 mg h –1 cm –2 ) in 0.1 M KOH electrolyte at – 0.52 V versus reversible hydrogen electrode. Furthermore, this catalyst exhibits a negligible activity decay during continuous electrolysis for 25 h. Further experiments provide the important role of Fe, which promote the formation of hydrogen radicals (H*). This study may provide new pathways to improve the activity of inexpensive catalysts for NITRR. Graphical Abstract
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
Journal of the Taiwan Institute of Chemical Engineers
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2025
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IF 6.3
Xiaoyuan Zhang,Qing Qin,Xuetong Zhai,Hongliang Guo,Song Han,Jo-Shu Chang,Duu-Jong Lee
Background Energy-efficient remediation technology for black and odorous water bodies in cold and salty areas is in high demand. This study experimentally investigated the performance of a novel integrated process at lab and pilot scales, in both batch and continuous-flow modes, to treat black and odorous lake water from Daqing City, China. Methods In 25-liter batch tests, relevant influence conditions were optimized. The 756-liter batch tests confirmed these results. Meanwhile, a continuous flow experiment was added to improve the removal rate of pollutants further. Significant findings In 25-liter batch tests maximum removal rates for COD, NH 4 + -N, TP, and TN were 78.6 %, 72.3 %, 79.1 %, and 76.3 %, respectively, using reed plants and carbon fiber grass with L 2 bacteria under optimal conditions (two cfb per floating-island unit, pH 8, DO of 4 mg/L, 25–30 °C, microbial enhancer of 0.75 g/flu). The 756-liter batch tests confirmed these results, achieving improved removal rates of 80.4 %, 75.1 %, 75.5 %, and 78.4 % over 30 days. Continuous-flow tests yielded maximum removal rates of 85.2 %, 89.5 %, 87.4 %, and 90.1 % at an 8-hour HRT, demonstrating superior performance under short retention times. The study revealed interactions with the key biological processes during remediation. The proposed costs for this method indicate high feasibility for field applications.
研究领域:
环境科学
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微生物学
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产品关联
DOI
高影响因子
Advanced Science
·
2025
·Vol. 12
·期 45
·e14304
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IF 14.1
Yinxia Du,Wangfei Che,Yunfei Shi,Juanjuan Lu,Xiaodong Zhou,Ting Liu,Shilie Pan,Junjie Li
Birefringent crystals are pivotal for modern optical modulation technologies, yet developing high-performance birefringent materials with large birefringence (Δ n ), wide bandgaps, and scalable synthesis remains a significant challenge. Different from the traditional planar [MQ 3 ] and distorted [MQ n ] (n ≥ 4) polyhedral units, a “linear-group” design strategy is proposed, targeting heavy-metal halides with [HgX 2 ] (X = halides) coordination modes to exploit their inherent polarizability anisotropy. Through systematic experimental investigations in the ternary A-Hg-X (A = Rb, Cs; X = Br, I) system, six novel Hg-based halides were synthesized. Notably, RbHg 5 Br 11 with linear [HgBr 2 ] units demonstrates excellent optical properties, including a wide bandgap (3.73 eV) and large Δ n ( cal. ) (0.35@546 nm). Importantly, the compound displays a good crystal growth habit, and the high-quality RbHg 5 Br 11 single crystal can be grown by the simple solution method. Theoretical calculations reveal that the strong optical anisotropy arises from the aligned [HgBr 2 ] linear units. The results demonstrate that RbHg 5 Br 11 is a promising birefringent material and give some new insights for designing high-performance optical materials based on the linear units with high polarizability anisotropy.
研究领域:
材料科学
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光学材料
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无机化学
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晶体工程
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产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2024
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IF 9.7
Bingqin Su,Wei Zhang,Feiyun Sun,Xiaohui Quan
Coking wastewater contains high concentrations of toxic and low biodegradable organics, causing long hydraulic retention times for its biological treatment process. This study developed a pretreatment method for coking wastewater by using activated carbon fiber (ACF) activated peroxymonosulfate (PMS) to improve the treatment performance of subsequent biological post-treatment process, sequencing batch reactor (SBR). The results showed that, after optimization of treatment processes, the removal efficiency of chemical oxygen demand (COD), phenol, and chroma in coking wastewater reached to 76, 98, and 98%, respectively, with a significantly improved biodegradability. Compared with the sole SBR system without any pretreatment that could remove 73% of COD, the ACF/PMS+SBR system removed over 97% of COD in coking wastewater. Moreover, this pretreatment method facilitated the growth of functional bacteria for organics biodegradation, indicating its high potential as a highly efficacious pretreatment strategy to improve the overall treatment efficiency of coking wastewater.
研究领域:
环境科学
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污水处理
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
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IF 6.9
Jiaopeng Lai,Ruotao Zeng,Xinru Bian,Wen Leng,Cao Yang,Lihui Yang,Wei Li,Guangzhao Wang,Ganfeng He,Sihao Lv
Although the widely used dimensional stable anode (DSA) exhibits good activity and selectivity on chlorine evolution reaction (CER), the high content of precious metals and poor stability hinder the application. This work reported the use of interface engineering strategy to develop a cost-effective Ti 4 O 7 anode with ultralow Ru nanoparticles (NPs) loading (0.29 wt%) (Ru@Ti 4 O 7 ) via metal-support interactions. More oxygen vacancies were created by the interfacial Ru-O-Ti units and accelerated the reaction kinetics and charge transfer rate. 1 %Ru@Ti 4 O 7 displays superior CER activity, reaching a current density of 10 mA cm −2 at a low overpotential of 96.5 mV and a turnover frequency 16 times higher than DSA. The Ru@Ti 4 O 7 anode also achieved complete ammonia oxidation mainly mediated by chlorine radicals, with a high N 2 selectivity of 82 %. Particularly, the sustainable treatment for farm odor spray wastewater by the Ru@Ti 4 O 7 system was verified, in which the efficient purification of ammonia nitrogen and the good electrochemical stability of citric acid realized the recycling of water and deodorant. This work provides great opportunity to fabricate desirable Ti 4 O 7 –based CER electrodes and develops a good solution to the enormous challenges faced by the farm odor emission reduction industry.
研究领域:
材料科学
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环境工程
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电化学
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产品关联
DOI
高影响因子
Nature Protocols
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2025
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IF 16
Dong Kai,Han Shuhe,Li Yanan,Wang Zhongliao,Xue Chuang,Sun Xiaogang,Yao Yongchao,Li Haobo,Wang Xin,Ma Dongwei,Liu Li-Min,Zhang Bin
The electrocatalytic nitrate reduction reaction (NO 3 RR) has emerged as a promising approach for sustainable nitrogen management, enabling the selective conversion of nitrate into targeted nitrogen-containing compounds, such as ammonia and hydroxylamine. However, the efficiency and selectivity of the NO 3 RR are highly dependent on the physicochemical properties of the electrocatalysts, necessitating a standardized and comprehensive characterization protocol. Here we provide a detailed methodology for the structural, chemical, electronic and electrochemical characterization of the materials used in the NO 3 RR. We outline procedures for evaluating catalyst morphology, composition and redox states, as well as methodologies for quantifying reaction products to determine nitrate conversion efficiency and selectivity. To track catalyst evolution and reaction pathways under reaction conditions, we present real-time monitoring strategies that capture structural changes, key reaction intermediates and electronic transformations associated with chemical bond formation and cleavage. In addition, we incorporate theoretical calculations to comprehensively evaluate the reaction pathways and their interplay with the electronic structures of electrocatalysts, providing deeper mechanistic insights into the reaction kinetics, active site evolution and selectivity-determining factors. This Protocol is designed for researchers in electrocatalysis, environmental chemistry and energy conversion, offering a reproducible workflow for catalyst assessment. The step-by-step methodology ensures reliable data collection and interpretation, enabling direct comparisons across different catalysts and facilitating the development of more efficient NO 3 RR catalysts. The entire workflow requires ~8–10 days, depending on sample preparation and measurement duration.
研究领域:
电催化
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环境化学
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能量转换
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材料科学
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可持续氮管理
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产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
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2024
·Vol. 53
·期 29
·12090-12097
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IF 3.5
Yingying Kong,Hongshan Wang,Wang Zhao,Qi Sun,Junjie Li,Shilie Pan
Hg-based compounds show abundant structural diversity and distinguished properties. Herein, a new phase transition compound CsHg2I5 was reported. The high-temperature phase β-CsHg2I5 with rare [Hg2I5] dimers was synthesized by the flux method at 573 K, and it shows a reversible phase transition at a low temperature of ∼100 K to form the low-temperature phase α-CsHg2I5. The two phases crystallize in the same P21/c space group, with different crystal structures. β-CsHg2I5 is composed of rare [Hg2I5] dimers and [CsI11] polyhedral units, while α-CsHg2I5 is composed of [Hg4I11] and [CsI10] units. The experimental band gap of β-CsHg2I5 was found to be 2.58 eV. Owing to the presence of [Hg2I5]∞ pseudo-layers, β-CsHg2I5 exhibits large optical anisotropy with a calculated birefringence of 0.132@1064 nm. Meanwhile, β-CsHg2I5 is a congruent compound and the congruent point is ∼481 K. Theoretical calculations indicate that the rare [Hg2I5] dimer is a nonlinear active unit, which can be used as a new fundamental building block for the design of advanced nonlinear optical materials. Moreover, a CsI–HgI2 pseudo-binary diagram was drawn. The results enrich the structural diversity of Hg-based halides and give some insights into the development of new functional materials based on rare [Hg2I5] dimers.
研究领域:
材料科学
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晶体学
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2025
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IF 6
Fengjiao Quan,Pengfei Xu,Xiufan Liu,Wenjuan Shen,Yuhao Li,Jianfen Li,Yun He,Fangyuan Chen
Nitrate (NO 3 − ) pollution in groundwater has emerged as a pressing environmental issue of global concern. The excessive application of chemical fertilizers is widely recognized as the primary contributor to this pollution Nitrate ions pose significant risks to human health and the ecological environment. Electrochemical reduction of NO 3 − to NH 3 (NITRR) represents an effective approach for nitrogen recovery and recycling. Among many electrode materials, copper-based catalysts were considered promising due to their low cost and strong NO 3 − conversion capability. However, excessively strong adsorption can lead to catalyst deactivation, thereby diminishing catalytic activity. In this study, we developed an electrode material (Cu@NiO/NF) with low-valent copper (Cu δ+ ) through the combination of Cu and NiO, and it exhibited excellent catalytic performance in the NITRR process. At − 0.45 V vs. RHE, this catalyst achieved a Faraday efficiency of 95.7 % and an ammonia yield of 0.85 mg h −1 cm −2 . Further experiments and theoretical calculations demonstrate that the presence of NiO in Cu@NiO/NF stabilizes Cu δ+ , thereby enhancing the charge transfer rate and promoting the formation of hydrogen radicals (H•). This work has pioneered a new avenue for the development of efficient and innovative NTIRR materials.
研究领域:
环境科学
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电化学
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催化
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材料科学
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水污染控制
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Pengfei Xu,Sisi Han,Fengjiao Quan,Xiufan Liu,Wenjuan Shen,Yuhao Li,Jianfen Li,Yun He,Kebing Song
Ammonia (NH 3 ), a widely used chemical product, has various applications in numerous fields. However, the high energy consumption of the traditional ammonia synthesis process is inconsistent with the pursuit of “zero carbon,” and there is an urgent need for a new method to synthesize NH 3 . The electrocatalytic NO 3 − -to-NH 3 (NITRR) offers an ideal route to synthesizing NH 3 under ambient conditions. Nano zero-valent iron (nZVI) has been widely used in nitrate wastewater treatment due to its environmental friendliness, low cost, and high activity. However, nZVI is difficult to recover and prone to deactivation because of its tendency to corrode and agglomerate. Here, we report a method to enhance the activity and stability of nZVI through oxalic acid modification. In this study, oxalic acid and citric acid modified nZVI on foam nickel substrates (OA-nZVI/NF) was examined as examples. Experiments confirmed that the Faraday efficiency of NH 3 (FE NH3 ) from OA-nZVI/NF was 84.9 %, respectively, at −0.4 V vs. RHE, which was significantly higher than that of nZVI/NF (64.5 %). More importantly, the FE NH3 of OA-nZVI/NF electrod did not decrease significantly after continuous electrolysis for 100 h. Subsequently, electrochemical characterization and control experiments revealed that oxalic acid modification reduced the corrosion potential of nZVI/NF and promoted the generation of hydrogen-free radicals (H*) from nZVI/NF. This work provides an economical and feasible approach to improving the stability and activity of corrosion-prone and deactivated materials.
研究领域:
环境科学
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电化学
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材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）