NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 24
·10850-10856
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IF 3.591
Xiaoyan Chen,Lin Song,Guanyang Zhu,Jing Ma,Ajing Xu,Wenya Zhao,Yingying Gu,Yarui An,Yuqing Miao
In this work, a unique zirconium dioxide solid superacid (ZrO2/SO42−) was utilized for the fabrication of an IgG electrochemical immunosensor. The treated ZrO2 formed a SO bond on the surface, which has the electron-attracting induction effect and can further enhance the quantity and stability of immobilized biomolecules. In addition, using a platinum nanoparticle–chitosan–reduced graphene oxide (PtNP–CHIT–rGO) nanocomposite as a substrate modification material not only improves the conductivity of the electrode, but also increases the effective surface area of the immunosensing platform. The proposed label-free immunosensor has a lower detection limit of 11.0 pg mL−1 and a wide linear range of 0.01–10.0 ng mL−1 and 10.0–4000.0 ng mL−1. Importantly, the immunosensor exhibits good selectivity, excellent stability and reproducibility, and is expected to be applied to the detection of other biomolecules.
研究领域:
生物化学
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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 PHYSICS AND CHEMISTRY OF SOLIDS
·
2023
·
IF 4
Zong-Bao Yu,Zhuozhuo Song,Peng Zheng,Jie Sun,Zhanxu Yang
Transition metal sulfides (TM sulfides) has long been regarded as highly promising materials for catalyzing oxygen evolution reaction (OER). The function of TM sulfides in OER occurs on TM oxyhydroxide and SO 4 2− , which are formed through surface reconstruction under certain potentials. It is worth noting that the impact of SO 4 2− on the local charge distribution among atoms, a crucial determinant of OER performance, has been insufficiently studied. This study aims to investigate the role of SO 4 2− in mediating the partial redistribution of charges among Co, Ni and O atoms on a precatalyst Co 9 S 8 /C–Ni(OH) 2 electrode. The electrode undergoes self-reconstruction to form a CoOOH/SO 4 2− /NiOOH structure on its surface that is active for the OER. The results demonstrate that SO 4 2− facilitates the local charge redistribution of active atoms, leading to optimized adsorption energy of OER intermediates and increased redox center of the material. Furthermore, SO 4 2− serves as an electron mediator in the OER process under varying applied voltages. Consequently, CoOOH/SO 4 2− /NiOOH achieves a Tafel slope of 56 mV dec −1 , an overpotential of 250 mV, and maintains a high stability for over 100 h at a current density of 20 mA cm −2 . Overall, this research provides valuable insights into catalytic reaction mechanisms and the design of efficient composite catalysts.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Membranes
·
2025
·
IF 9.5
Wenlong Ding,Haoyu Liu,Jiayi Liao,Tongtong Wang,Dongze Li,Yu Xu,Shiyu Zhou,Zhiqiang Wu,Wenhui Shi,Jiangnan Shen,Junbin Liao
Construction of homogeneous polymer ion-exchange membranes (IEMs) with suitable ion transport channels and stable structures is crucial to the separation of mono-/multi-valent anions. Amphoteric ion-exchange membrane (AIEM) is a special type of IEM that possesses unique properties due to the presence of both anion exchange groups and cation exchange groups. In this work, we have grafted 1-bromoheptane and 3-bromopropanesulfonate onto the poly(aryl ether sulfone) chain through nucleophilic substitution reactions. Unlike the IEM attaching different ion-change functional groups onto one side-chain, this kind of AIEM bears two kinds of ion-change functional groups on dual side-chains. The results show that the as-prepared AIEMs could maintain low water absorption (< 20%) and swelling ratios (< 11%). The optimal surface area resistance is 6.31 Ω∙cm 2 . The perm-selectivity (Cl − /SO 4 2− ) of the optimized PAES-TA/BS-0.85 AIEMs in a binary mixed solution system at 2.5 mA∙cm 2 could be achieved as high as 67.46, which is much higher than commercial ACS IEMs under the same conditions. Small Angle X-ray scattering reveals a distinct phase separation pattern within the AIEM matrix, which is due to the introduction of sulfonates to increase the hydrophilicity of the side-chains. The combined effects of pore size screening and electrostatic repulsion render the high selectivity of as-prepared AIEMs.
研究领域:
材料科学
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化学工程
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膜技术
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电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 21
·9663-9671
·
IF 2.7
Huimin Ren,Qiuchen Wang,Yanzhi Sun,Yongmei Chen,Pingyu Wan,Junqing Pan
Purification treatment is needed to control the concentration of SO42− and Ca2+ in brine to solve the problem of low electrolysis efficiency for the electrolysis of KCl solution in the chlor-alkali industry. However, the traditional barium method to remove SO42− faces the problem of high cost and environmental pollution. Herein, inexpensive and environmentally friendly anhydrous calcium chloride was used as the precipitant to replace barium chloride. The conditions for SO42− removal at room temperature were optimized by studying the precipitant doping ratio, reaction time, and stirring speed. The results indicated that the concentration of SO42− in brine could be reduced to less than 5 g L−1 at a raw material ratio of nCa2+ to nSO42− of 1.1 : 1, a stirring speed of 300 rpm, and a reaction time of 120 min. Ca2+ in the solution could be removed by introducing carbon dioxide, and the removal rate of Ca2+could reach 99.89% by adjusting the pH of the solution to an appropriate value. This work paves a new way for efficient brine refining to boost sustainable development in the chlor-alkali industry.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Hailin Chang,Shilei Fu,Ziao Zhang,Yating Hu,Zijian Cui,Jun Ma,Kexin Hou,Xiaobin Tang,Guibai Li,Heng Liang
Nanofiltration (NF) membranes with efficient selectivity are critical for addressing water source pollution from toxic heavy metals and emerging micropollutants. Herein, we engineered a polyamide (PA) NF membrane with ambidextrous selectivity by leveraging the concentration-driven effect of piperazine (PIP) during interfacial polymerization (IP). This PIP concentration-driven effect was verified by modulating the PIP concentration gradient from low to high, which enhanced IP efficiency via both an intensified alkaline reaction environment and concentration-driven diffusion. The optimized NF membrane features an ultrafine pore size distribution and reduced electronegativity, exhibiting a remarkable shift from sole SO 4 2− /Cl − selectivity to impressive ambidextrous selectivity, encompassing both SO 4 2− /Cl − (α ≈ 48, 98.3 % for Na 2 SO 4 ) and Mg 2+ /Na + (α ≈ 37, 98.2 % for MgCl 2 ). Moreover, it membrane also achieved exceptional removal efficiencies of 94.8–98.9 % for heavy metals and 77.6–99.3 % for antibiotics, while maintaining a water permeability of 19.3 L/m 2 h bar and mitigating the perm-selectivity trade-off. When purifying surface water containing heavy metals and antibiotics, the optimized NF membrane exhibited superior multi-pollutant removal and improved water production quality compared to the NF270 and NF90 membranes, and especially with its water permeance increased by ~27 % to 179 %. Our work uncovers a fundamental correlation between the PIP concentration, IP reaction, PA nanostructures and NF performance, providing valuable insights into customizing high-performance NF membranes to address complex water pollution challenges.
研究领域:
环境工程
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膜科学
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水处理
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高分子化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2016
·
IF 1.207
Zhixian Huang,Yixiong Lin,Ling Li,Changshen Ye,Ting Qiu
The solid acid SO 4 2 − /TiO 2 was prepared by immersion method and applied for synthesis of propylene glycol methyl ether acetate (PMA) through esterification reaction of propylene glycol monomethyl ether (PM) and acetic acid (HAc). The optimal catalyst preparation condition was determined by orthogonal analysis of parameters in a five-factor and four-level test. The obtained solid acid catalysts were characterized in detail by means of X-ray powder diffraction, thermogravimetry, pyridine adsorbed IR analysis, scanning electron microscopy, and BET surface area method. Synthesis of PMA was studied in this paper through experimental investigation of reaction conditions such as temperature, molar ratio of reactants, catalyst dosage and agitation speed. Based on its possible reaction mechanism, a pseudo-homogeneous kinetic model was established and its activation energies E a + and E a − , 65.68 × 10 3 J·mol − 1 and 57.78 × 10 3 J·mol − 1 , were estimated. To prepare shaped solid acid catalyst SO 4 2 − /TiO 2 , the shaping method of impregnation–shaping–impregnation was applied. The optimal molding formulation of solid acid catalyst, obtained from the orthogonal test, was found to be binder 7 wt.%, reinforcing agent 20 wt.%, pore forming material 2.5 wt.%, and lubricant 4 wt.%. The results of performance test of catalyst demonstrated that the shaped solid acid catalyst exhibited high activity and stability.
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2014
·
IF 3.309
Huiling Li,Aojie Deng,Junli Ren,Changyu Liu,Wenju Wang,Feng Peng,Runcang Sun
One of the most promising strategies for furfural production is to extract continually the target product from the aqueous solution utilizing organic solvents. With the aim to develop an ecologically viable catalytic pathway for furfural production without the addition of mineral acids, we presented a modified biphasic system using a solid acid (SO 4 2− /TiO 2 -ZrO 2 /La 3+ ) as catalyst for producing furfural from xylose. Different kinds of aprotic organic solvents (DMSO, DMF and DMI) in water phase and 2-butanol in organic phase (MIBK) were investigated as reaction media. Furfural yield and xylose conversion efficiency were dependent on the amounts of aprotic organic solvents and 2-butanol, the solid/liquid ratio, and the volume ratio of the organic phase and the aqueous phase as well as the reaction temperature and time. As a result, DMI showed the best performance on improving furfural yield during the furfural production. 3563.3 μmol of furfural/g of xylose with 97.9% xylose conversion efficiency was obtained after 12 h at 180 °C when the volume ratios of water to DMI and MIBK to 2-butanol were 8:2 and 7:3, respectively.
研究领域:
生物化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Qiang Wang,Wei Gao,Yang Liu,Jiwen Yuan,Zhijun Xu,Qingfu Zeng,Yuguang Li,Martin Schröder
A novel silica gel based absorbent SG-H 2 L 1 , capable of simultaneous adsorption of cations and anions from aqueous solution, was prepared by immobilization of a ditopic zwitterionic Schiff base ligand H 2 L 1 onto a modified silica gel. The functionalized silica gels were characterized by Fourier transform infrared spectroscopy , elemental analysis, thermogravimetric analysis and porous structure analysis. The results showed a degree of functionalization of 0.32 mmol H 2 L 1 per gram of SG-H 2 L 1 . The effect of pH, contact time and initial Cu(II) and SO 4 2− concentration parameters on the simultaneous adsorption of Cu(II) and SO 4 2− ions were investigated. The adsorption was fast and the effective pH range for simultaneous adsorption of Cu(II) and SO 4 2− was neutral region. The adsorption study showed that SG-H 2 L 1 had good adsorption efficiency for Cu(II) and SO 4 2− , and the maximum adsorption capacity for Cu(II) and SO 4 2− , respectively, was the same of 0.65 mmol g −1 at 25 °C. Langmuir and Freundlich isotherm models were employed to analyze the experimental data, and the Langmuir model fitted better for both Cu(II) and SO 4 2− . Due to the zwitterionic feature, desorption and regeneration of the absorbent was readily realized by adjusting the pH of the regenerating media with diluted H 2 SO 4 (0.5 mol L −1 ) and ammonia solution (pH = 10), respectively. The new type absorbent SG-H 2 L 1 exhibited good recyclability and reusability for 5 cycles use without deterioration in its functionality. Therefore, the adsorbent can be used effectively for efficient and simultaneous adsorption of Cu(II) and SO 4 2− from waste water. The mechanism for simultaneous adsorption of cation and anions on SG-H 2 L 1 was also discussed. This study provides a strategy for the development of new absorbents for simultaneous adsorption of hazardous metal ions and anions from waste water effluents .
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Xiaodi Li,Shan Ren,Lian Liu,Xiangdong Xing,Lin Chen,Jiangling Li,Jian Yang,Qingcai Liu
The serious deactivation of denitration catalysts caused by heavy metals still a thorny issue in the practical application of selective catalytic reduction of NO x with NH 3 . Herein, we proposed a novel anti-poisoning strategy by designing SO 4 2− /ZrO 2 superacid supported CeO 2 /ZrO 2 catalyst, and the effect of SO 4 2− /ZrO 2 supported CeO 2 /ZrO 2 for PbO-resistance NO x catalytic reduction was investigated. It was worthy to note that the introduction of solid superacid SO 4 2− /ZrO 2 significantly enhanced catalytic performance over the entire temperature range, with an exceptionally high NO x removal efficiency over 98 % during 250–500 °C. When 2 wt% PbO was deposited on the fresh catalyst, the catalytic activity of CeO 2 /ZrO 2 catalyst decreased obviously, while CeO 2 /ZrO 2 -S catalyst can still maintain a higher NO x conversion over 90 % from 275 to 500 °C. The characterization results confirmed that the introduction of solid superacid SO 4 2− /ZrO 2 enhanced the surface acidity and promoted the transformation from Ce 4+ to Ce 3+ . The results of in situ DRIFTS implied that the Eley-Rideal (E-R) mechanism was obeyed over CeO 2 /ZrO 2 catalyst, and both Eley-Rideal (E-R) and Langmuir-Hinshelwood (L-H) mechanisms were followed over CeO 2 /ZrO 2 -S catalyst in the SCR process. With regard to poisoned catalysts, the NH 3 adsorption was inhibited to some extent, while the reaction mechanism wasn’t changed by PbO poisoning.
研究领域:
催化
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 76
·61593-61600
·
IF 3.84
Liang Xiao,Ya Xiong,Zhanhao Wen,Shuanghong Tian
A kind of one-dimensional coordination polymer, [Cu(bipy)X]n (X = 2Cl− or SO42−), was prepared by Cu2+ and 4,4′-bipyridine (bipy) through a facile method, and used as the adsorbent for removal of acid orange 7 (AO7) and methyl orange (MO) from water. Two kinds of anions, chloride ion and sulfate ion, were tested as the counter ion in preparing the [Cu(bipy)Cl2]n and [Cu(bipy)(SO4)]n to balance the positive charge of [Cu(bipy)]n2+, to research the impact of anions on the adsorption performance of the [Cu(bipy)]n2+. Compared to [Cu(bipy)Cl2]n, [Cu(bipy)(SO4)]n can remove the dyes better both from the view of the adsorption capacity and adsorption kinetic constant. The MO can be more easily adsorbed than AO7 by both adsorbents. The adsorption capacity of [Cu(bipy)Cl2]n for AO7 and MO reached 848 mg g−1 and 1084 mg g−1, respectively. However, the adsorption capacity of [Cu(bipy)(SO4)]n for AO7 and MO reached 3308 mg g−1 and 1521 mg g−1, respectively. The dominant adsorption mechanism of the two adsorbent in removing dyes was found to be ionic exchange and the ultra high adsorption capacity of [Cu(bipy)(SO4)]n for AO7 was attributed to the two-step adsorption process which can be observed from the adsorption isotherm. The mechanism of the second adsorption step was speculated to be hydrophobic adsorption and π–π interaction.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Linghui Zhao,Yufan Chen,Yong Feng,Deli Wu
In this study, three GR/Cu(II) (Green Rust/Cu(II)) composites (GR SO4 /Cu(II), GR CO3 /Cu(II), and GR Cl /Cu(II)) were synthesized and used to activate dioxygen under weakly acidic conditions. The change in the mechanism caused by three interlayer anions, CO 3 2− , SO 4 2− , and Cl − , was discussed for the first time. Both Cu(I) and H 2 O 2 were generated during GR/Cu(II)-induced dioxygen activation, resulting in the rapid degradation of acetaminophen. The inconsistency between the reaction constant rates and oxidation reduction potential (ORP) order revealed the effects of the various types of interlayer ions. To further reveal the effects of the anions, the variations in the morphology and valence states of the composites were examined. To identify the rate-controlling step of dioxygen activation by the three composites, the production of reactive oxygen species (ROS) was investigated and compared. The combination of interlayer anions and metal ions changed the oxide morphology of the solid-phase materials. Furthermore, changes in the content of the reductive species (Fe(II) or Cu(I)) either enhanced or inhibited specific reaction steps. The results from this study could deepen our understanding of the effects of anions on dioxygen activation by transition metals and provide a basis for the study of oxidation reactions and mechanisms in the presence of various anions.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL GEOLOGY
·
2022
·
IF 4.685
Hao Cui,Richen Zhong,Zimeng Li,Huan Chen,Chang Yu,Yanxia Li,Yifan Ling
Raman spectroscopy is a crucial technology in geoscience and often employed in in situ quantification experiments to investigate fluid compositions at elevated temperatures. Raman spectroscopic quantification is fundamental to understanding the hydrothermal behaviors of aqueous species, such as SO 4 2− and H 3 PO 4 0 . Considering that SO 4 2− and PO 4 3− are closely associated with metal transportation and deposition, investigating the hydrothermal behaviors of these species, via Raman spectroscopic quantification, can give an assistance for the comprehension of relative ore-forming processes. During Raman spectroscopic quantification, the accuracy of the calibration coefficient ( k ), which bridges the concentration of a species ( C species ) and its Raman peak area ( A normalized ) in the form of C species = k · A normalized , is the key to accurate measurement of fluid composition. For high-temperature experiments, quantification of fluid composition is complicated because the coefficient k varies with varying temperatures. In this study, the temperature dependence of the calibration coefficients is retrieved, based on experiments on solutions containing SO 4 2− and H 3 PO 4 0 using the fused silica capillary capsules. The results show a well-established linear relationship between the k and 1/ T (absolute temperature in Kelvin) for both SO 4 2− and H 3 PO 4 0 . The reported linear k − 1/ T relationship simplifies Raman-based fluid composition investigation at elevated temperatures: the k values throughout the whole temperature range of interest can be retrieved by measuring the room-temperature Raman intensity of a standard sample (i.e., with known composition) and one single data point at high temperature. We speculate that this linear k − 1/ T relationship method may be established for other species (e.g., carbonate ions) and can be applied for experiments using other technics (e.g., hydrothermal diamond anvil cell) or retrieving the compositions of natural or synthetic fluid inclusions . For example, the empirical linear relationship can facilitate the measurements of gas concentrations (e.g., CO 2 ) in natural fluid inclusions .
研究领域:
地质科学
·
光谱学
✓ 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）