JOURNAL OF CHEMICAL THERMODYNAMICS
·
2016
·
IF 2.196
Rongrong Li,Jiaqi Weng,Cuihong Ye,Anguo Ying,Qizhong Zhou,Aiguo Zhong,Hao Chen,Jianguo Yang
The equilibrium solubility of sodium 2,4-diaminobenzene sulfonate in liquid mixtures (methanol + water, isopropanol + water, and 1,2-propanediol + water) were determined at temperatures ranging from (273.15 to 323.15) K. The solubility of sodium 2,4-diaminobenzene sulfonate increased with temperature increment but decreased with the concentrations of methanol, isopropanol or 1,2-propanediol in liquid mixtures. The obtained solubility data were correlated by Apelblat equation and Sun model. On the base of the measured solubility, the dissolution enthalpy ( Δ H sol o ) of the dissolution process were calculated.
研究领域:
药物化学
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物理化学
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药剂学
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溶解行为研究
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热力学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Luyue Wang,Yuzhu Chen,Zhengyang Xing,Jie Ma
Real-time monitoring of metal ion species and concentrations in water is a highly active research field. In the paper, a novel fluorescent molecule, (E)-N'-((5-(9-phenyl-9H-carbazol-3-yl) thiophen-2-yl) methylene) terephthalohydrazide (PCTMT), is synthesized via Suzuki reaction and Schiff-base reaction in turn. In the DMF-H 2 O (70 % v/v) solvent system, the PCTMT presents a good aggregation-induced enhancement (AIE) fluorescent effect and good selectivity and anti-interference for monitoring Co 2+ and Cu 2+ in water with a wide pH range. The probe's detection limit (LOD) reached 28.2 nM and 38.7 nM for Co 2+ and Cu 2+ , respectively. The binding constants between PCTMT and Co 2+ and Cu 2+ are calculated as 1.8 ×10 17 M -2 and 2.3 ×10 16 M -2 , at a 2:1 mol ratio. In the probe system, Co 2+ and Cu 2+ can be distinguished by oxalate titration. The detection mechanism is discussed through testing analyses with the theoretical simulation calculation via the density functional theory (DFT) and time-dependent density functional theory (TD-DFT). The probe also indicates good detection capacities in real water samples. This study may promote the development of coordinated-type ion probes and innovation in water quality detection technology.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Heliyon
·
2023
·
IF 4
Jingqi Zhang,Ying Song,Jingbo Chao,Hai Huang,Dazhi Liu,Frederic Coulon,Xiao Jin Yang
Zero-valent iron (ZVI) has been extensively studied for its efficacy in removing heavy metals, nitrate, and chlorinated organic compounds from contaminated water. However, its limited effectiveness due to rapid passivation and poor selectivity is prompting for alternative solutions, such as the use of aluminium alloys. In this study, the efficacy of five distinct aluminium alloys, namely Al–Mg, Al–Fe, Al–Cu, and Al–Ni, each comprising 50 % Al by mass at a concentration of 10 g/L, was assessed using copper, nitrate and trichloromethane (TCM) as model contaminants. Results show that chemical pollutants reacted immediately with Al–Mg. On the contrary, the remaining three alloys exhibited a delay of 24 h before demonstrating significant reactivity. Remarkably, Al–Mg alloy reduced nitrate exclusively to ammonium, indicating minimal preference for nitrate reduction to N 2 . In contrast, the Al–Cu, Al–Ni, and Al–Fe alloys exhibited N 2 selectivity of 3 %, 5 %, and 19 %, respectively. The removal efficiency of copper, nitrate and TCM reached 99 % within 24 h, 95 % within 48h and 48 % within 48h, respectively. Noteworthy findings included the correlation between Fe concentration within the Al–Fe alloy and an increased N 2 selectivity from 9.3 % to 24.1 %. This resulted in an increase of Fe concentration from 10 % to 58 % albeit with a concurrent reduction in reactivity. Cu 2+ removal by Al–Fe alloy occurred via direct electron transfer, while the removal of nitrate and TCM was facilitated by atomic hydrogen generated by the alloy's hydrolysis. Intriguingly, nitrate and TCM suppressed Cu 2+ reduction, whereas Cu 2+ improved nitrate reduction and TCM degradation. These findings demonstrate the great potential of Al–Mg and Al–Fe alloys as highly efficient agents for water remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Menglan Gao,Xiaobin Liao,Shuting Chen,Xiaoying Li,Yirou Zhang,Chao Chen,Huan Qi
Bromide ion (Br - ) in water sources has been found to affect the formation of carcinogenic non-brominated N-nitrosodimethylamine (NDMA) during ozonation of typical amines. The increasing bromide levels bring more concern due to climate change and industrial discharge, but its effects on actual water matrixes were still unclear. In this study, NDMA formation from three actual water matrixes during ozonation as the Br - concentration increased from 0 to 100 µM were investigated (promotion (100.4 ∼ 231.6 ng/L), promotion then inhibition (399.5 ∼ 461.2 ∼ 428.2 ng/L), and subtle influence (51.9 ± 6.9 ng/L)); from which the NDMA precursors were screened and 8 precursors were selected for exploring the influencing mechanisms. The results indicated that the roles of Br - on NDMA formation significantly depended on the water characteristics of actual matrixes. A total of 16 typical NDMA precursors, which were mainly derived from industrial, agricultural and pharmaceutical sources, were identified. Moreover, 6 brominated substance (Br-DMA, Br-UDMH, Br-DMSC, Br-DMS, Br-TMDS, Br 2 -TMDS), which were thought to play a crucial role in promoting NDMA formation, were also identified in actual water by precursor ion scan (PIS) method. Hypobromous acid (HOBr), which has been proved to be the culprit to the generation of brominated substances, tend to attack the electron-donating groups of amines, such as acylamino (–NHCO-R) or amidogen (–NH 2 ) groups. However, the reactive bromine species (∙Br and ∙Br 2 - ) was inclined to attack the aromatic and anti-oxidant moieties then result in Br - release, as no bromine substitution but free radical transfer reaction occurs. Therefore, decreasing HOBr formation is the crucial step to reduce NDMA generation. This work would provide technical guide for NDMA risks control during ozonation of Br - -amines co-containing water matrixes.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Technology & Innovation
·
2024
·
IF 6.7
Dong-Xing Guan,Tian-Jiao Wei,Guang-Hui Yu,Jun Luo,Gang Li
Silicon is an essential component of various environmental processes and biogeochemical cycles with silicate (H 4 SiO 4 ) representing the bioavailable form of silicon in waters and soils. This study aimed to develop a method for accurately measuring labile silicate levels in waters and soils using diffusive gradients in thin-films (DGT) with a hydrogel diffusive gel and a modified precipitated zirconia (mPZ) binding gel. The diffusion coefficient of silicate in the diffusive gel, measured using an independent diffusion cell, was 6.77 × 10 −6 cm 2 s −1 at 25 °C. The mPZ gels were found to be effective at quickly and efficiently binding silicate, and a mixed solution of 0.5 mol L −1 NaOH and 0.5 mol L −1 H 2 O 2 was determined to effectively elute silicate from mPZ gels, with an elution factor of 1.0. Furthermore, mPZ-DGT was found to be able to measure silicate at various pH levels (4.03–7.93) and ionic strengths (0.1–1000 mmol L −1 NaNO 3 ). Field application of mPZ-DGT devices in an urban river revealed a decrease in silicate concentration downstream compared to upstream, likely due to increased human activity. Finally, mPZ-DGT was used in four sandy or loam soils to measure silicate concentration, and the results showed relatively small variations compared to those measured by CaCl 2 and ammonium oxalate extractions. The findings suggest that mPZ-DGT is a useful tool for monitoring labile silicate concentrations and assessing its bioavailability in waters and soils.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Fang Tao,Yujia Tan,Junwei Dai,Congrui Lu,Yadong Sha,Yi Liu,Xinxing Zhou,Qingele Hasi,Zhemin Shen,Yuning Ma
Halogenated methanesulfonic acids (HMSAs) are an important new class of organic compounds as they were universal in the water cycle and drinking water sources. However, no study has investigated the presence of HMSAs in surface water and sediment from China. The present study reports the occurrence and spatiotemporal distribution of seven HMSAs in water and sediment samples from Hangzhou Bay, China. Trifluoromethanesulfonic acid (TFMSA) was the main contributor to the concentrations of HMSAs in water and sediment samples from spring, summer, autumn and winter which were 30.8–541 ng/L, n. d.-86.6 ng/L, 4.22–70.9 ng/L and 8.86–192 ng/L, separately, while in sediment samples were n. d.-11.1 ng/g, n. d.-12.9 ng/g, n. d.-22.5 ng/g, n. d.-4.60 ng/g, respectively. The levels of HMSAs in water from winter and spring were higher than those in summer and autumn, and the concentrations of the target HMSAs in water presents a seasonal pattern affected by the temperature, the precipitation and river flow variations. Nevertheless, the levels of HMSAs in sediment were highest in the area near the industrial area and the confluences of rivers. Correlation analysis revealed that the concentrations of TFMSA were significantly positively correlated with total organic carbon (TOC) in water samples. Although TFMSA is regarded as low toxic based on the EC 50 value of acute toxicity, the potential risks to aquatic ecology should be paid more attention due to its high concentrations in the aquatic system and the environmental persistency.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Xuan Chang,Tingting Duan,Jiashen Feng,Ying-Xia Li
The common use of peroxides in the remediation of malodorous black water may lead to the activation of heavy metals in sediment when eliminating black and odorous substances. The mechanisms of heavy metal interactions with dissolved organic matter (DOM) in response to in situ capping have not been elucidated, but this information could guide the optimization of capping materials. We developed a capping material consisting of hydrothermally carbonized sediment (HCS), hydrated magnesium carbonate (HMC) and sodium percarbonate (SPC) and used microcosm experiments to investigate the dynamics of Mn and Cu at the sediment–water interface in malodorous black water. The results showed that HCS, HMC and SPC contributed multiple functions of mechanical protection, chemical isolation and oxygen provision to the new caps. HMC promoted the conversion of Mn/Cu into carbonate minerals. The optimal mass proportions were 25 % HCS, 60 % HMC and 15 % SPC based on the mixture design. In situ capping altered the fate and transformation of metals in the sediment-overlying water profile in the short term through Mn immobilization and Cu activation. The complexation of Cu(II) ions was significantly stronger than that of Mn(II) ions. In situ capping had a significant effect on the order of complexation of different fluorescent DOM molecules with Mn(II)/Cu(II) ions: microbial byproducts and fulvic acid-like components were preferentially complexed with Cu(II) ions after capping, while phenolic and humic acid-like components preferentially interacted with Mn(II) ions. Humic-like components bound to Cu were affected the most by capping treatment, whereas protein-like components were relatively weakly affected. Our study provides valuable knowledge on the impact of in situ capping on DOM–metal complexes.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Zhou Fang,Ying Su,Yaqin Yu,Huaijian Zhang,Xintian Qian
Diffusive Gradients in Thin-films (DGT) technique is a promising passive sampling technique, which was used for the determination of lots of inorganic and organic pollutants. Although many DGT devices have not been extensively tested and verified in field, DGT device such as LSNP-NP, LSNT-NP, LSNZ-NP, and LSNM-NP DGT were widely employed for the assessment of various trace elements. However, the deployment time of these DGTs were much shorter than the theoretical time in the preexisting literature. Therefore, the performance of DGT for long-term application in different water bodies is not known. This investigation utilized the four DGTs for the assessment of various trace elements across extended periods both in controlled laboratory settings and natural field environments. Synthetic soft, hard, and seawater compositions served as media for laboratory deployments. Most elements can be measured accurately in 4–7 days in soft and hard water. Deployment durations in seawater exhibited a notable reduction compared to those in freshwater matrices. LSNZ-NP DGT excelling in oxyanion determination, while LSNT-NP DGT showcased superior efficacy in phosphorus quantification. Field deployments in rivers and sea affirmed the robustness of LSNZ-NP DGT, evidencing prolonged deployment capabilities for various elements, such as Mo, Se, As, Sb, and P, spanning 7–28 days. Assessment of pollution levels across four sampling sites revealed heightened concentrations of most elements in marine waters relative to riverine environments, except for phosphorus. Notably, all assessed elements, except for phosphorus, conformed to Class I water quality standards. This study demonstrated the difference between the theoretical application time and actual application time for the first time. It raises new questions for the application of DGT in nature water bodies. The mechanization of the difference between the theoretical and actual application time should be studied in the future research. The measures to extend the application time should be studied too.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Ya Dan Li,Hui Hui Chai,Shu Jie Zhang,Zhi Song Lu,Chang Ming Li,Ling Yu
A sensitive and portable on-thread pre-concentration and colorimetric detection method of copper ions was proposed. Commercial cotton thread was proposed as a solid sorbent for effectively extracting copper ions (Cu 2+ ) from solution. The adsorbed Cu 2+ was converted to Cu + by ascorbic acid . The Cu + on the threads was visualized by horseradish-peroxidase-catalyzed color changes of a chromogenic oxidized tetramethylbenzidine substrate. The adsorption of Cu 2+ on the plasma- and Na 2 CO 3 -treated thread was verified by scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction, and zeta potential characterization. The Cu + -induced dysfunction of HRP on the thread was verified by X-ray photoelectron spectroscopy. With optimized reaction conditions, the concentration-dependent colorimetric response plot was characterized, where the linear detection range was 2–400 nM and the detection limit was about 0.15 nM. Measurements of a group of possible interfering ions and spiked real-water samples demonstrated the good selectivity of the proposed method. The proposed on-thread pre-concentration and colorimetric detection offers a low-cost and effective alternative for detecting of copper ions in real applications.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Xiahong Shi,Xiaoting Zhang,Wei Gao,Yalin Zhang,Defu He
Microplastics (MPs) have been widely detected in aquatic environments, and become emerging contaminants of growing concern. It is urgently needed to explore how to effectively remove MPs from water. This study first established an alternative method of removing MPs by magnetic nano-Fe 3 O 4 . Results showed that 1.3 g·L −1 nano-Fe 3 O 4 and 150 min treatments caused optimal magnetization of MPs via surface absorption. Then, magnetized MPs in water can be conveniently removed by suction of the magnet. The average removal rate of four common types of MPs including polyethylene, polypropylene , polystyrene and polyethylene terephthalate in size of approximately 200–900 μm was 86.87 ± 6.92%, 85.05 ± 4.70%, 86.11 ± 6.21%, and 62.83 ± 8.34%, respectively. The removal rate varied among polymer- and size-different MPs, and was positively related to the density of nano-Fe 3 O 4 absorbed on MP surfaces. In addition, the removal rate of MPs in artificial seawater was relatively high in comparison to pure water. Furthermore, the established approach was effectively applied to remove MPs in environmental water bodies including river water, domestic sewage, and natural seawater, with the removal rate of higher than 80%. Altogether, this study provided a novel and simple removal approach to remove MPs in water, which has a certain application prospect.
研究领域:
环境科学
·
材料科学
·
水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chemical Engineering Journal Advances
·
2023
·
IF 0
Mengsi Cheng,Ying Fang,Zhaoguang Yang,Xinghao Liu,Bo Qiu,Tong Zhang,Haipu Li,Wenbo Zhao
MIL-100(Fe) was modified by amino groups (MIL - 100(Fe) - NH 2 ) to enhance the removal of antimonate (Sb(V)) with low concentration (50−200 μg/L) from natural water through batch adsorption experiments. With the initial Sb(V) concentration up to 200 μg/L, the residual Sb(V) concentration after treated by MIL - 100(Fe) - NH 2 was only 3.52 ± 0.131 μg/L, lower than the drinking water standards (5 μg/L) in China, while that was much higher (94.2 ± 3.52 μg/L) after pristine MIL-100(Fe) treatment. Based on results of XPS analysis, and adsorption kinetics and isotherms, we concluded that Sb(V) substituted the terminal −OH groups of MIL-100(Fe) to form inner-sphere complexes by coordination reactions with Fe nodes and be adsorbed by hydrogen bonding as well. The grafted amino groups (−NH 2 ) adsorbed Sb(V) by hydrogen bonding and facilitated the coordination reactions between Sb(V) and Fe nodes. The higher K L value (0.0116 ± 0.00,118 L/μg) obtained by fitting with the Langmuir isotherm model, while that of unmodified MIL-100(Fe) was 4.74 × 10 −4 ± 5.85 × 10 −5 L/μg, also confirmed that the −NH 2 groups greatly enhanced the affinity between MIL-100(Fe) and Sb(V). Furthermore, MIL - 100(Fe) - NH 2 still worked nicely in a wide pH range (2 − 12), with varied ionic strength (0.05 µmol/ L −1.5 mol/L), coexisting ions (CO 3 2− , NO 3 − , SO 4 2− , Cl − , H 2 PO 4 − ), and even in the real water bodies. Additionally, MIL - 100(Fe) - NH 2 exhibited good reusability and low Fe leaching (99.92 μg/L). We hope MIL - 100(Fe) - NH 2 become a candidate for effective removal of Sb(V), even other heavy metals from natural waterbodies.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 5
·2290-2298
·
IF 2.7
Xuewei Zhang,Jing Ye,Zhigang Ni,Xuerui Yang,Yuefei Ji,Jean-Marc Chovelon,Guangli Xiu,Lei Zhou
Kresoxim-methyl (KM), an extensively used strobilurin fungicide, displays broad-spectrum fungicidal activity. Despite its prevalent application in agriculture and frequent detection in the environment, specific studies on the photolytic fate of KM in natural surface waters are quite limited. To address this, the present study delves into the photochemical transformation of KM under light irradiation using a high-pressure mercury lamp. Photodegradation of KM followed pseudo-first-order kinetics, with a degradation rate constant of 0.067 ± 0.005 h−1, corresponding to a half-life of approximately 10.3 ± 0.7 h, and the quantum yield was estimated to be 6.95 × 10−3. Transient species identification experiments demonstrated the involvement of singlet oxygen (1O2) and singlet (1KM*) and triplet (3KM*) states. Four different photodegradation pathways, i.e., photoisomerization, hydrolysis, hydroxylation, and ether cleavage, were proposed. Toxicity assessments demonstrated that photodegradation effectively reduced the ecotoxicity of KM. Two typical pesticide adjuvants, namely, Tween 20 and sodium dodecylbenzenesulfonate (SDBS), were selected to evaluate their impacts on KM photolysis. While Tween 20 exhibited a remarkable increase in the photodegradation of KM, SDBS showed a concentration dependent behavior, with an inhibitory effect at low concentrations (<200 μM) and promotional effects at higher concentration levels. The present study elucidated the photolytic KM degradation mechanism, as well as its possible inhibition and enhancement, which is of significant importance for evaluating the environmental fate and ecotoxicological risks of KM in sunlit surface waters.
研究领域:
环境科学
·
农药化学
✓ 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）