Sensors & Diagnostics
·
2023
·Vol. 3
·期 1
·79-86
·
IF 0
Min Shen,Tingting Pan,Yonghao Chen,Juewei Ning,Fengyu Su,Yanqing Tian
Ammonium ions (NH4+) are one of the important metabolic products and are closely related to human health. Currently, many NH4+ detection methods are inevitably disturbed by amino acids, K+, or other substituted amines (such as trimethylamine). To alleviate this problem, a new sensor was designed in this study, which consisted of the fluorescent indicator KS, hydrogel medium D4, and a hydrophobic membrane. In this sensing system, NH4+ and NH3 coexisted in equilibrium; NH3 could pass through a suitable hydrophobic film and transform into NH4+, which complexed with KS, resulting in a change of the probe's fluorescence intensity. By adjusting the internal composition of the sensing matrix, an excellent NH4+ sensor NS-1 was obtained; it demonstrated effective detection of NH4+ in the range 0.3–15.6 mM with a limit of detection (LOD) of 258 μM, and it was not disturbed by K+ or other substituting amines.
研究领域:
生物化学
·
分析化学
✓ 已验证
DOI
ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Lu Jiang,Pingxiao Wu,Yijing Xu,Yihao Li,Meiqing Chen,Zubair Ahmed,Nengwu Zhu
Triclinic birnessite (TB), a typical layered Mn oxide which is abundant naturally occurring minerals with a vital impact on the transformation of arsenite (As(III)) by adsorption and oxidation . As one of the most common critical metalloids , ammonium ion (NH 4 + ) universally coexists with birnessite in marine, sediments or groundwater where are contaminated with As(III). In this study, we investigated the impacts of NH 4 + on TB towards the transformation of As(III). Compared with the original TB (40.1%), the As(III) removal efficiencies of three different concentration (0.5 M, 1 M and 2 M) NH 4 + impressed triclinic birnessite (TB-0.5 N, TB-1N and TB-2N) are increased rapidly in the order of: TB-2N (80.4%) > TB-1N (75.8%) > TB-0.5 N (71.5%). In addition, TB-2N exhibited the highest initial oxidation rate of 0.0031 min −1 which exceeds twice as much as this of TB (0.0014 min −1 ). And TB-2N could reach the max oxidation efficiency when the As concentration is 0.08 mM. Due to two different mechanisms of As(III) oxidation on birnessites under acidic and alkaline conditions, TB-2N showed a higher removal efficiency than TB at pH 3.0, 5.0, 7.0 and 9.0. Hence, there are two main reasons for the advanced As(III) oxidation capacity of TB-2N. One is the improvement of the average oxidation state of Mn, the other is the increase of oxygen vacancy with the coexistence of NH 4 + . Moreover, the larger specific surface area of TB-2N also contribute to enhancing As(III) oxidation capacity. This study holds a fundamental understanding of the behavior of triclinic birnessite which is coexisted with ammonium ion towards the transformation of As(III) in the environment.
研究领域:
环境科学
·
矿物学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 13
·15068-15082
·
IF 3.056
Li Jingqiao,Zhang Wenjing,Qin Yunqi,Li Xiaofei,Wu Shengyu,Chai Juanfen,Du Shanghai
To investigate co-transport behavior of ammonium and colloids in saturated porous media under different hydrochemical conditions, NH 4 + was selected as the target contaminant, and silicon and humic acid (HA) were selected as typical organic and inorganic colloids in groundwater. Column experiments were then conducted to investigate the transport of NH 4 + colloids under various hydrochemical conditions. The results showed that because of the different properties of colloidal silicon and HA after combining with NH 4 + , the co-transport mechanism became significantly different. During transport by the NH 4 + –colloid system, colloidal silicon occupied the adsorption sites on the medium surface to promote the transport of NH 4 + , while humic acid (HA) increased the number of adsorption sites of the medium to hinder the transport of NH 4 + . The co-transport of NH 4 + and colloids is closely related to hydrochemical conditions. In the presence of HA, competitive adsorption and morphological changes of HA caused NH 4 + to be more likely to be transported at a higher ionic strength (IS = 0.05 m, CaCl 2 ) and alkalinity (pH = 9.3). In the presence of colloidal silicon, blocking action caused the facilitated transport to be dependent on higher ionic strength and acidity (pH = 4.5), causing the recovery of NH 4 + to improve by 7.99%, 222.25% (stage 1), and 8.63%, respectively. Moreover, transport increases with the colloidal silicon concentrations of 20 mg/L then declines at 40 mg/L, demonstrating that increased concentrations will lead to blocking and particle aggregation, resulting in delayed release in the leaching stage.
Graphical abstract
研究领域:
环境科学
·
水文学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2015
·Vol. 182
·期 15
·2419-2425
·
IF 3.741
Feng Zhongmin,Guo Tingting,Jiang Zhiwen,Sun Ting
We have investigated the possibility of sampling ammonium ion using the diffusive-gradients-in-thin-films technique (DGT) by introducing a novel binding agent that is based on micro-sized zeolite. The performance of zeolite-DGT was characterized by measurement of the following parameters: (1) the diffusion coefficient of ammonium ion in hydrogel; (2) the adsorption rate of ammonium ion by the zeolite binding gel; (3) the elution efficiency, and (4) the effects of pH, ionic strength and interfering ions on DGT. The method was validated by studying the uptake of ammonium ion from in freshwaters by zeolite gels which was found to be fast enough to meet the requirements of DGT. The concentrations determined via DGT agreed well with the concentrations determined in bulk solutions. Sampling of ammonium ion using zeolite-DGT was consistent over the pH 3 to 8 range and the 0.001 to 10 mM ionic strength range. The method also performs predictably in natural waters containing various metal ions. The technique is considered to be a viable passive tool for sampling ammonium from aqueous solutions.
Schematic representation of the principle of DGT and the determination of mass accumulated on the binding gel.
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
TALANTA
·
2020
·
IF 5.339
Yongrong Jiang,Xuezhi Dong,Yuzhe Li,Yan Li,Ying Liang,Min Zhang
This work presents a lab-made automatic flow-batch system for headspace single-drop microextraction and on-drop conductometric sensing ammonium. Sample and NaOH solution are simultaneously pumped into a reaction chamber (RC), where ammonium is converted to ammonia by raising pH. The converted ammonia then diffuses into the headspace of the RC, and reacts with a 100 mM boric acid drop. The conductivity of the drop is measured by an on-drop conductivity probe, which is made by two stainless-steel contacting electrodes. The result shows that the increasing rate of conductivity has a linear relationship to the ammonium concentration in sample (R 2 = 0.9945). This method has a linear range up to 400 μM, a limit of detection 2.8 μM, a relative standard deviation of 3.0% (200 μM, n = 10) and carryover coefficient 0.028. Measurements of river waters, lake waters and wastewaters have been demonstrated. The recoveries have achieved from 99.0 to 114%. This method avoids using of harmful or odorous reagents and follows the concept of green chemistry.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2020
·
IF 2.213
Qianqian Yin,Mengtian Liu,Yonghua Li
It is effective to adsorb phosphate and ammonium from water by sludge-based biochar, while the desorption performance has not been studied systematically. Biochar in this study was prepared through the co-pyrolysis of sludge and walnut shells to remove NH4+ and PO43− from water. The desorption characteristics of NH4+ and PO43− from the post-adsorption sludge-based biochar were investigated. The effects of the adsorption condition (concentration of adsorption solution) and desorption conditions (pH value of desorption solution and desorption temperature and time) on desorption performance were examined. Several techniques were performed to characterise the properties of the post-adsorption sludge-based biochar. The adsorption amount of the pure sewage sludge biochar (SBC) for PO43− and the biochar derived from the co-pyrolysis of sewage sludge and walnut shell with the mixing ratio of 3:1 (MBC3-1) for NH4+ were 14.19/ 23.75 mg/g and 9.28/ 16.23 mg/g, respectively, when the concentrations of the adsorbates were 100 and 500 mg/L. The desorption experiments showed that the acidic condition (pH = 2) was beneficial for PO43− and NH4+ desorption. The highest desorption ratio reached 7.58% for PO43− and 2.18% for NH4+. The desorption of PO43− was endothermic, whereas that of NH4+ was exothermic. The desorption amounts of PO43− and NH4+ decreased and increased, respectively, with the increase in desorption time. This study of the desorption characteristics of PO43− and NH4+ in sludge-based biochar provides a theoretical basis for the subsequent utilisation of sludge-based biochar.
研究领域:
环境科学
·
水处理技术
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Shuxin Huang,Jian Feng,Junxia Yu,Yi Wang,Jiequan Liu,Ruan Chi,Haobo Hou
Release of the remaining ammonium salts from the weathered crust elution-deposited rare earth ore (WCE-DREO) would pose a serious threat to the environment. Thus, in this study, the adsorption and desorption performances of the WCE-DREO and four minerals that composed it were investigated to select an efficient eluent for the remained ammonium removal. Results showed that the ammonium ion adsorbed on the WCE-DREO and the clay minerals as a monolayer, and the calculated adsorption capacities were as follows: montmorillonite > WCE-DREO > halloysite > illite > kaolinite due to their different structure. pH experiment showed that it had great effects on ammonium adsorption on both the WCE-DREO and the investigated clays. Kinetic experiments showed that ammonium sorption and desorption process were both a fast process. Co-ions experiments showed that Mg 2+ showed the highest inhibition effect on the ammonium adsorption on the WCE-DREO due to its ionic character. Based on this data, magnesium salt was chosen as the eluent, and results showed that more than 93 % of the remaining ammonium ion could be removed from the WCE-DREO in the batch and column experiments.
研究领域:
环境科学
·
矿物学
✓ 已验证
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 4
·1479-1486
·
IF 2.8
Liu Yang,Chen Han,Lou Xiaoming,Wen Xiaoyu,Yin Zhenguo,Xiang Kaixiong
Rechargeable aqueous ammonium-ion batteries (AAIBs) have attracted more and more attention in energy storage devices because of great safety and cost-effectiveness, as well as excellent rate capability. Recently, it is the main exploration focus for the further improvement of AAIBs to develop suitable electrode materials. Herein, titanic acid and TiO 2 were simply synthesized by the facile co-precipitation approach. Titanic acid showed higher capacity of 104.5 mAh g −1 at the 0.1 A g −1 current density, and higher cyclability with the 91.2% capacity retention cycled 1000 cycles at 1 A g −1 . Titanic acid is promising as aqueous ammonium-ion batteries with great stability and capacity.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yueheng Tao,Jing Jin,Xinyue Zhang,Zhangjiashuo Qian,Jintian Jiang,Minjie Shi
Capacitive deionization (CDI) is rapidly gaining recognition as a highly auspicious technology for water purification and effluent treatment. At the core of CDI technology reside electrode materials, which perform a pivotal function in the removal of contaminants through electrosorption process. While organic compounds present a vista of sustainable synthesis and versatile molecular architectures, their proclivity for dissolution in aqueous solutions and the paucity of redox-active sites pose significant hurdles to their implementation in CDI electrodes. Herein, this work presents the successful engineering of a novel polymer, designated as PATQ, through a facile one-step polymerization process utilizing aminoanthraquinone (ATQ) as the monomer. The strategic incorporation of abundant and readily available C=O redox-active sites, coupled with the meticulous construct of a conjugated framework to ensure high structural stability, endows the PATQ polymer with remarkable capabilities as an electrode material for NH 4 + electrosorption. This exceptional performance is corroborated by electrochemical measurements and in-situ Raman spectroscopy. Furthermore, a high-efficiency hybrid CDI device has been created, showcasing a notable NH 4 + removal capacity of 101.5 mg/g and a rapid removal rate of 6.18 mg/g min −1 , along with energy recovery features. Therefore, this work paves the way for efficient, sustainable and cost-effective water purification technologies.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Science China-Technological Sciences
·
2024
·
IF 4.4
Niu WenXing,Zhao XinRui,Yuan Min,Hou ZhiGuo,Liu Lei,Xu Hong,Dong JinXiang
We studied different long-chain ammonium ions intercalated zirconium phosphate α-ZrP, methylamine intercalated ZrP (MA-ZrP), tetramethylammonium hydroxide intercalated ZrP (TMAH-ZrP), dodecyltrimethylammonium bromide intercalated ZrP (DTAB-ZrP), and stearyl trimethyl ammonium bromide intercalated ZrP (STAB-ZrP) as grease co-additives in combination with isobutylene sulfide (SIB). The grease with co-additives displayed excellent extreme-pressure and anti-wear performance. Moreover, the combination of the longest chain ammonium ion intercalated zirconium phosphate, STAB-ZrP/SIB, had the best tribological properties. In comparison to α-ZrP, the advantage of STAB-ZrP was that it did not form a large area of the dense physical film like α-ZrP on the worn surface, but rather gave the SIB a chance to contact with the fresh metal surface to generate a chemical film. Therefore, the sub-micron physical film and nanoscale chemical film always exist side by side on the contact surface during the friction process. This intercalated α-ZrP/SIB additive has great potential for use in harsh operating conditions.
研究领域:
材料科学
·
摩擦学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 3
·e56362
·
IF 2.7
Tianbing Li,Xiaozhen Lu,Haonan Chen,Junlong Cai,Hongbo Gao,Xuewu Zhu,Jian Yu,Guangchao Li
Polymer sensitive membrane is a key component of the ammonium ion selective electrode (ISE). Developing a high-performance ammonium ion polymer sensitive membrane can promote production and application of the electrode, reducing costs and simplifying ammonia nitrogen detection. In this study, we modified the surface of the ammonium ion selective membrane and synthesized a low-cost antimicrobial material by anchoring the broad-spectrum antimicrobial agent, silver nanoparticles (AgNPs), on the surface of two-dimensional transition metal car- bides (Ti 3 C 2 Tx MXene). This material can be used as a carrier to avoid the release of AgNPs. The inorganic antimicrobial agent AgNPs@MXene was adhered to the surface of the ammonium ion-selective membrane by polydopamine, forming an antimicrobial coating. The modified ammonium ion-selective electrode had a rapid response time of 12 s, with an average response time of 12.4 s. After repeated tests, a lower detection limit of 5.89 × 10 −7 (10 −6.23 ) mol/L was achieved in ammonium chloride solution. These results indicate that the ammonium ion monitoring electrode we prepared can effectively monitor ammonia nitrogen concentration in sewage and wastewater over a long period of time. This also enhances the service life of the ammonium ISE and reduces maintenance costs for the sensor.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Lei Meng,Chen He,Fei Yen
Most ferroelectric crystals have their own set of unique characteristics, and ammonium sulfate (NH4)2SO4 is no exception. We report on two previously unidentified features in ammonium sulfate: (1) that there are at least two successive transitions instead of one occurring at the Curie temperature TC = 223 K according to dielectric constant measurements, and (2) pronounced step-like anomalies are found in the magnetic susceptibility χ(T) exactly at TC. To explain these results, we take into account that there exists a previously unidentified linear coupling between the magnetic and electric dipole moments of the NH4+ tetrahedra due to their rapid reorientations and distorted geometry, respectively. The magnetic moments are small, 0.0016 μB for every C3 reorientation, which involves three protons (H+) undergoing orbital motion. Nevertheless, short-range correlations exist in the paraelectric phase because the magnetic moments are restricted to only point along 14 possible orientations due to the symmetry and periodic nature of the potential wells. At TC, C2 reorientations (involving four protons) are no longer energetically feasible, so the reduction in the degrees of freedom to 8 further enhances the effect of the magnetic interactions. This triggers long-range ordering of the orbital moments in an antiferromagnetic configuration along the ab-plane, which via Dzyaloshinskii–Moriya interactions ends up canting slightly toward the c-axis direction. Since there exist two types of inequivalent NH4+ groups that reorient at different frequencies with temperature and do not have the same degree of distortion, the emerging polar phase is ferrielectric. This previously unidentified “magneto-protonic” effect can be further extended toward understanding the fundamental causes of the spontaneous polarization in many other ferroelectric crystals as well as provide the missing link toward understanding the enhanced functionalities of many hydrogen-based compounds and organic–inorganic hybrid materials.
研究领域:
物理学
·
材料科学
✓ 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）