WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 2
·1-13
·
IF 2.9
Wei Yaru,Zhang Kaili,Cheng Tiexin,Zhou Guangdong
In this paper, FeS m /BC composites were prepared using coconut shell biochar (BC) as the carrier. FeS m on FeS m /BC is preferentially oriented along the (001) crystal plane and exhibits a uniform honeycomb morphology. It has a high specific surface area and a small pore size distribution, which is more suitable as a heavy metal ion removal material. The results show that Cr(VI) can be almost completely removed within 120 min under acidic conditions with an initial concentration of 10 mg/L of Cr(VI), a temperature of 20 °C, and a dosage of 0.6 g/L of adsorbent. Where pH was the main factor influencing the removal of Cr(VI):pH affects Cr(VI) removal by changing the form of Cr(VI) in the solution, adsorption free energy, redox potential, charged species on FeS m /BC surface, and the reduction properties of Fe 2+ and S 2− , low pH value is more favorable for Cr(VI) removal. Coexisting anions in solution inhibit Cr(VI) removal due to competitive adsorption, but coexisting cations have no effect. The adsorption process of Cr(VI) by FeS m /BC follows the pseudo-second-order kinetics and Langmuir adsorption isotherm model, indicating that the adsorption process is a monolayer surface adsorption controlled by the chemical adsorption mechanism and involves electron sharing or exchange between adsorbent and adsorbate. Thermodynamic study shows that the adsorption process is a spontaneous entropy-increasing process, and raise the temperature is beneficial to the adsorption. The removal of Cr(VI) by FeS m /BC is the synergistic effect of adsorption, reduction, and co-precipitation.
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 14
·2072
·
IF 5.3
Xu Zhang,Bo Tian,Zhiheng Ma,He Wang,Zhixuan Cheng,Jiaqiang Xu
As a volatile air pollutant, formaldehyde can enter people’s living environment through interior decoration, furniture and paint, causing serious harm to human health. Therefore, it is necessary to develop a sensor for the real-time detection of formaldehyde in low concentrations. According to the chemical interaction between amino groups and formaldehyde, a MIL-101(Cr) aminated-material-based formaldehyde cantilever sensor was prepared, of which ethylenediamine- functionalized MIL-101(Cr) named ED-MIL-101(Cr)) showed the best gas sensing performance. Using quasi-in situ infrared spectroscopy, ED-MIL-101(Cr) was found bound to formaldehyde through a Schiff base. The adsorption enthalpy of formaldehyde-bound ED-MIL-101(Cr) was −52.6 kJ/mol, which corresponds to weak chemical adsorption, so the material showed good selectivity. In addition, ED-MIL-101(Cr) has the most active sites, so its response value to formaldehyde is larger and it takes longer to reach saturation adsorption than bare MIL-101(Cr). Through the research on the gas sensing performance of functionalized MIL-101(Cr) material, we found that it has a strong application potential in the field of formaldehyde monitoring, and the material performance can be quantitatively and accurately evaluated through combining calculation and experimentation for understanding the gas sensing mechanism.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 17
·5785
·
IF 3.4
Weiran Zhang,Ziyu Li,Guohua Wu,Wei Wu,Hailan Zeng,Haiyun Jiang,Weili Zhang,Ruomei Wu,Qiong Xue
The utilization of Co-Cr-Fe-based black pigments bears considerable significance within the realm of commercial ceramic pigments, owing to their distinctive spinel structure, remarkable high-temperature stability, and exceptional chromatic attributes. This study delves into the synthesis of diverse black pigment configurations by employing the co-precipitation method, leveraging the interplay of these three metallic oxides. This investigation encompasses a comprehensive scrutiny of ion valences, crystal structures and parameters, colorimetric properties, and their interrelationships. The methodology integrates the response surface methodology (RSM) framework, using theoretical formulations to navigate the material ratios and elucidating the associations between the resultant compositions and color coordinate values, aligned with the CIE-Lab* colorimetric methodology. The derived predictive models yielded an optimized black pigment composition, characterized by heightened black intensity and a refined formulation.Keywords:black ceramic pigment;response surface methodology;co-precipitation method;chromatic properties;spinel
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Shuoqi Ren,Yuchen Wang,Zijian Han,Qiwei Zhang,Chongwei Cui
A highly efficient absorbent was developed in this study by modifying polydopamine film on Mg–Al layered double hydroxide (PDA/MgAl-LDH) to remove Cr(VI) from wastewater. The characterization results showed that the polydopamine film was successfully coated on the MgAl-LDH surface. The preparation ratio, pH, and adsorbent dosage influencing absorption by PDA/MgAl-LDH were systematically investigated. The absorption capacity of Cr(VI) by PDA/MgAl-LDH was 87 mg/g. The equilibrium adsorption isotherm of PDA/MgAl-LDH was in good agreement with that of the Langmuir model. Therefore, the pseudo-second-order kinetic model is suitable for describing adsorption kinetics. The interaction between PDA and Cr(VI) and Cr(III) was investigated using density generalized function theory (DFT), which demonstrated that the PDA amino group could provide electrons for Cr(VI) reduction. Hydrogen and covalent bonding were dominant during the chemisorption process of PDA absorbing Cr(VI), the nitrogen of 5,6-dihydroxyindole was the primary active site for absorbing Cr(III), and electrostatic attraction was mainly responsible for Cr(III) absorption. Therefore, PDA/MgAl-LDH has the potential to adsorb and remove Cr(VI) from wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yanli Wang,Hongyi Li,Huijun Liu,Lingxu Yang,Chaoliu Zeng
In this work, two Cr-free high entropy oxides (HEOs), an equimolar (MnFeCoNiCu) 3 O 4 and a non-equimolar (Mn 0.272 Fe 0.272 Co 0.272 Ni 0.092 Cu 0.092 ) 3 O 4 have been synthesized by a solid-state reaction method. The reaction sequence and electrical conductivity were also studied for these two HEOs. It is demonstrated that a rock-salt phase containing a solid solution of NiO and CuO appears in the synthesizing process of (MnFeCoNiCu) 3 O 4 , which is ascribed to the incomplete solubilization of rock-salt phase in the spinel phase. For (Mn 0.272 Fe 0.272 Co 0.272 Ni 0.092 Cu 0.092 ) 3 O 4 , a single spinel phase (Fd-3m) is obtained at 750 °C, which is much lower than that of the (MnFeCoNiCu) 3 O 4 sample. Furthermore, Mn, Fe, Co, Ni elements exist in the chemical states of +2 and + 3, and Cu exists in Cu 2+ state. The electrical conductivity of (Mn 0.272 Fe 0.272 Co 0.272 Ni 0.092 Cu 0.092 ) 3 O 4 is approximately 15.77 S cm -1 at 800 °C, which is nearly three times higher than that of the (MnFeCoNiCu) 3 O 4 sample.
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2022
·
IF 6.137
Yanfeng Huang,Yuliang Tu,Jinxiong Wu,Xiangjing Liang,Dongye Zhao,Patrycja Boguta,Xintai Su
Cr-contaminated soil is a serious threat to the ecological environment and human health because of its high toxicity of Cr(VI), and it needs to be treated properly. In this study, commercial humic acid (HA) was used as an extractant to treat high concentration of Cr contaminated soil (amorphous phase bound state), and the Cr(VI) removal rate was 90.55% under the optimal conditions (pH = 12, concentration 1 g/L, extraction time 24 h, liquid-solid ratio = 20:1). In this process, the remaining Cr species in the HA-treated soil was the most stable and the least mobile, with the highest retained native soil organic matter (SOM) compared to ethylenediaminetetraacetic acid (EDTA) and citric acid (CA). In addition, the economic cost advantage of HA was outstanding at only $55.3 per ton of soil contaminated with high concentrations of Cr(VI). Studies have shown that HA can be a "green" and more cost effective alternative to the traditional extractants EDTA and CA when targeting extraction treatments for high concentration Cr-contaminated soils and other Cr-containing wastes.
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Xie Dan,Wang Ruimeng,Fu Jinghao,Zhao Zhongxing,Li Min
Surface-enhanced Raman scattering (SERS) is an important and powerful analytical technique in chemical and biochemical analyses. Metal–organic frameworks (MOFs) can effectively capture volatile organic compounds (VOCs) with high adsorption capacity and fast kinetics, and the local surface plasmon resonance characteristics of gold nanoparticles can quickly and effectively distinguish different VOCs by SERS. Combining both, we designed a novel SERS substrate based on embedding gold nanoparticles (AuNPs) within MIL-101(Cr) for the recognition of various VOCs in the gaseous phase. Occupying of AuNPs inside MIL-101(Cr) increased the micropore-specific surface area of AuNPs@MIL-101(Cr), which enabled AuNPs@MIL-101(Cr) to absorb more toluene molecules and consequently realized its high detection sensitivity. The detection limits for toluene, 4-ethylbenzaldehyde, and formaldehyde were down to 6, 5, and 75, ppm respectively. Moreover, this substrate could be used for detecting different VOCs simultaneously. Finally, we discussed the enhancement of AuNPs outside and inside MIL-101(Cr) on the Raman signal.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Xiaxi Zhang,Fen Wei,Tao Bao,Sicen Wang
In this study, we report the adsorption removal of indomethacin sodium (IDM) by the mixed-linker Materials of Institute Lavoisier (MIL)-101(Cr)s. The MIL-101(Cr)s were synthesized by controlling the ratios of 1,4-benzene dicarboxylic acid (H 2 BDC) and 2-amino-1,4-benzene dicarboxylic acid (NH 2 –H 2 BDC). Then their adsorption performances toward IDM were investigated. Due to the increase in specific surface area and the contribution of enhanced multiple action mechanisms, MIL-101(20) was proved to have the optimal IDM absorption among all the mixed-ligand MIL-101(Cr)s. The adsorption kinetic data was found to accord with the pseudo-second-order kinetic model, and the rate constant ( k 2 ) was calculated as 0.0059 g mg −1 min −1 . The selected MIL-101(20) exhibited the maximum IDM adsorption capacity of approximately 641 mg g −1 (318 K), calculated from the Langmuir linear plots. The simulation results of the thermodynamic model suggest that the adsorption could be a spontaneous, endothermic process with increasing randomness. The adsorption mechanism analysis indicates that the synergistic effects of electrostatic interaction , hydrogen bond interaction, and π-π stacking could be responsible for efficient IDM adsorption. In addition, the adsorbent also presented good reproducibility over six successive adsorption/desorption cycles. Therefore, the mixed-ligand MIL-101(Cr) could be recommended as a promising adsorbent for the preferential removal of IDM from polluted wastewater.
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2022
·Vol. 28
·期 5
·2349-2362
·
IF 2.961
Han Jia-Jun,Yan Qi-ruo,Chen Zhao-wen,Wang Zhen,Chen Chao
Polyaniline (PANI) has been widely used for the energy storage applications either as a conducting agent or directly as an electroactive material due to the tunable pseudocapacitive performance owing to its various oxidation states. Nanocomposites including PANI, PANI/graphene oxide (PANI/GO), and PANI/GO/Cr-MOF were synthesized via a novel in situ chemical oxidative polymerization method including two oxidants. The structure and morphology of composites were characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM) measurements. Furthermore, PANI, PANI/GO, and PANI/GO/Cr-MOF were assembled as positive electrode materials into a button-type supercapacitor for electrochemical performance testing; the electrochemical performances of the composites were characterized by cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS) techniques in detail. The ASC (asymmetric supercapacitors) possessed an extended potential window (0.8 V), an extraordinary specific capacitance (243.125 F/g at 0.5 A/g, 243 F/g at 1 A/g, and 242.5 F/g at 2 A/g, and these data fully demonstrate that this material has excellent rate performance), a remarkable cycling property (90.72% capacitance retention after 5000 cycles), and a satisfactory average energy and power density (21.56 wh/kg and 3.6 kW/kg).
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Hongfei Yin,Chunyu Yuan,Huijun Lv,Kaiyue Zhang,Xue Chen,Yongzheng Zhang
Environmental crisis aroused from the Cr(VI)-containing wastewater has received much attention, due to the cancer-causing and mutagenic feature of Cr(VI). Photocatalytic technology has been considered to be a favorable contestant for coping with Cr(VI)-containing effluent. In this study, Ti 3 C 2 MXene/Zn 3 In 2 S 6 Schottky junctions with different content of Ti 3 C 2 MXene were prepared for Cr(VI) photoreduction. The inherent physical and photoelectrochemical characters of the obtained Ti 3 C 2 MXene/Zn 3 In 2 S 6 Schottky junctions were fully characterized. Compared with the pure Zn 3 In 2 S 6 , all the nanocomposites showed enhanced photocatalytic performance, the apparent kinetic constant of the optimized sample was 3.17 times the height of the Zn 3 In 2 S 6 . The improved photoreduction performance largely originated from the effectual separation and transfer of the photoexcited charge carriers. In the meantime, the deleterious role of superoxide radicals for Cr(VI) photoreduction was confirmed. It is anticipated this research can deliver a new-fangled vision for constructing efficient photocatalyst for Cr(VI) photoreduction.
✓ 已验证
产品关联
DOI
高影响因子
Sustainability
·
2021
·Vol. 14
·期 1
·21
·
IF 3.251
Shuangshuang Zhang,Wenhui Zhang,Yazhen Wan
To remedy the widespread chromium (Cr) pollution in the environment, this study mainly used the ultrasonic-assisted co-precipitation and precipitation methods to prepare FeS-modified Fe-Al-layered double hydroxide (FeS/LDH) composite material. The experimental results showed that FeS/LDH has higher removal efficiency of Cr in aqueous solution and stronger anti-interference ability than unmodified LDH. Under the same reaction conditions, the removal efficiency of total Cr(Cr(T)) using LDH was 34.85%, and the removal efficiency of Cr(VI) was 46.76%. For FeS/LDH, the removal efficiency of Cr(T) and Cr(VI) reached 99.57% and 100%, respectively. The restoration of Cr(T) and Cr(VI) by FeS/LDH satisfied the Langmuir adsorption isotherm. The maximum adsorption capacity of Cr(T) and Cr(VI) achieved 102.9 mg/g and 147.7 mg/g. The efficient removal of Cr by FeS/LDH was mainly based on the triple synergistic effect of anion exchange between Cr(VI) and interlayer anions, redox of Cr(VI) with Fe2+and S2−, and co-precipitation of Fe3+and Cr3+.Keywords:chromium;FeS/LDH;double reduction;anti-interference;co-precipitation
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Lanlan Li,Xiaoyu Dong,Jihong Chen,Jing Xiao,Li Zeng,Zhengwen Huang,Zhirong Zou
A rapid and easy-used colorimetric method was developed for on-site and rapid analysis of Cr(VI). Under acidic condition, Cr(VI) was reacted with 1, 5-diphenylcarbazide (DPC) and a purple-red complex was formed subsequently, inducing the color changed from colorless to purple-red, this color variance can be detected by ultraviolet–visible spectrophotometer (UV–Vis), smartphone and even naked-eye. For realizing the goal of on-site analysis, this method was integrated in a three dimensional (3D) printed analytical kit, smartphone was used as a portable detector. Under the optimized conditions, limit of detections (LODs) of 0.0014 μg/mL and 0.0016 μg/mL were obtained by smartphone and UV–Vis, respectively. Concentration of Cr(VI) as low as 0.05 μg/mL was still visible by naked-eye. This colorimetric system was further applied to the analysis of several environmental water samples, recoveries of 90–107 % were obtained. It is a promising portable analytical device/system for Cr(VI) on-site and rapid analysis.
✓ 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）