JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Jing Liao,Yuke Wu,Xueshan Chen,Huimin Yu,Yao Lin,Ke Huang,Jinyi Zhang,Chengbin Zheng
Hexavalent chromium (Cr(VI)), a confirmed human respiratory carcinogen, has attracted widespread attention due to its high toxicity and mobility in natural water systems. However, the developed catalytic colorimetric probes for Cr(VI) detection remain challenging, such as various species of Cr(VI) coexisting in water or acid buffer, the obvious interference from oxidizing ions at acidic pH, the synthesis of complex materials, and the consumption of hydrogen peroxide. In this work, a phenomenon of UV light-triggered chromate to produce singlet oxygen under neutral pH was found. An environmentally-friendly method based on the rapid oxidation of chromogenic substrates was thus developed for the highly specific and accurate detection of Cr(VI). Cr(VI) serves as both the active center and the target of this system, which ensures the rapidity, simplicity, and environmental protection of the proposed colorimetric strategy. Importantly, the neutral catalytic condition ensures that the predominant species CrO 4 2- can be accurately quantified and avoids the interference of oxidizing ions. Subsequently, a portable analytical system integrating an array of LED lamps, a miniature color reading device, and a developed smartphone-based program was successfully developed to accomplish high-throughput and on-site analysis of Cr(VI) in natural water. The proposed method provides a rapid screening and water quality assessment tool for the faster, more cost-effective, and accurate detection of Cr(VI) in the water system.
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JOURNAL OF MOLECULAR STRUCTURE
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2022
·
IF 3.841
Lulu Wang,Jing Lu,Yujia Wang,Haiyan Wang,Jilin Wang,Tieqiang Ren
In this study, a series of MIL-101-X catalysts were prepared by confining acidic ionic liquid phosphotungstate in MIL-101 nanocages using the organic electron-rich N-heterocyclic compound as a chemical bridge and the aforementioned catalysts were used for the oxidation of cyclohexene to adipic acid. During the aforementioned process of post-synthetic modification, a Bronsted acidic ionic liquid phosphotungstate ([C 3 SO 3 Hnhm] 3 PW 12 O 40 ) was synthesized in the nanocage of MIL-101. The research results reveal that the yield of adipic acid for the cyclohexene oxidation catalyzed by the constructed MIL-101-X catalyst was up to 78.16% in solvent-free condition. And its catalytic activity is not significantly reduced after six cycles. The novel catalyst synthesized in this paper combines the common advantages of ionic liquid phosphotungstate and MIL-101 nanocage microenvironment to facilitate the diffusion of reactants and their interaction with the catalytic activity center. This research will provide a new idea to solve the problem in terms of the shortage of efficient catalysts in the field of catalytic oxidation of cyclohexene to adipic acid.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Qinchao Shao,Xiubin Zhang,Pei Liang,Qiang Chen,Xiaohua Qi,Mingqiang Zou
Fabrication of a magnetic substrate based on metal–organic frameworks (MOFs) with high sensitivity and stability for surface-enhanced Raman scattering (SERS) analysis were reported in this paper. MIL-101(Cr) nanoparticle prepared via a traditional hydrothermal reaction, which was combined with Fe 3 O 4 to synthesize the Fe 3 O 4 /MIL-101(Cr) composites. Then, the concentration of chloroauric acid and the time of reduction reaction were adjusted to acquire the optimal Au/Fe 3 O 4 /MIL-101(Cr) (AF-MIL) SERS substrate. The detection ability of the substrate can down to 10 -8 mol/L for Rhodamine 6G (R6G) as probe molecule, and the relative standard deviation (RSD) is only about 4.48 %, which indicates that it possesses wonderful SERS performance and uniformity. Finally, the as-synthesized substrate has been adopted to test the trace level sulfapyridine, with its desirable detection ability can down to 10 -6 mol/L. Such desirable SERS substrate with facile and effective operation holds great promise in the fast sensitive detection of the antibiotic residue and some other pollutants in environment.
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CHEMOSPHERE
·
2022
·
IF 8.943
Jun Hou,Yan Li,Hanlin Ci,Lingzhan Miao,Guoxiang You,Jun Wu,Yi Xu
Aggregation behaviors of bare, and sodium polyacrylate (PAA) and starch modified zero-valent-iron nanoparticles (nZVI), as well as their effects on the Cr (VI) removal were investigated by simulating the groundwater. Results showed that increased concentration of PAA (1–6 wt%) and starch (0.1–0.6 wt%) alleviated the aggregation of modified nZVI (abbreviated as P-nZVI and S-nZVI), while there was an optimum dosage of 4 wt% PAA and 0.3 wt% starch for the Cr (VI) removal, respectively. Moreover, as one of the fundamental water chemistry parameters, Ca 2+ (0, 5, and 10 mg L −1 ) greatly promoted the aggregation of modified nZVI, and decreased the Cr (VI) removal efficiency by them via forming bidentate bridging structure (between Ca 2+ and PAA) or complexes (between Ca 2+ and starch). Additionally, fulvic acid (FA) (0, 2, 5, and 10 mg L −1 ) decreased the Cr (VI) removal by P-nZVI because of the significantly improved electronic repulsion. However, FA enhanced the aggregation of S-nZVI, but diminished its performance on Cr (VI) removal due to the bridging effect between FA and starch. The present study was of great importance in predicting the migration of nZVI and contaminants removal under complex geological conditions in groundwater.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Basem E. Keshta,Haojie Yu,Li Wang,Ali H. Gemeay
MIL-101(Cr) MOF (MIL-Materials of Institute Lavoisier; Metal-organic framework) as an adsorbent has great application in water treatment because of its high stability against air, temperature, and chemicals. Herein, we develop a novel value-added, sustainable, and eco-friendly green method to prepare MIL-101(Cr) hydrothermally based on organic and inorganic waste recycling (G-MIL-101(Cr)@R) without hydrofluoric acid (HF) addition. Several characterization techniques suggest that G-MIL-101(Cr)@R was successfully synthesized. Then, it was used as an adsorbent for acid blue 92 dye (AB-92) as a model of anionic dyes. The adsorption parameters were studied, such as adsorbent dose, contact time, pH, dye concentration, temperature, salinity, and dye selectivity. The results showed that the adsorption of AB-92 is a monolayer according to the Langmuir isotherm with a q max of 2176 mg/g. Adsorption kinetics follow the pseudo second-order model (R 2 = 0.99), occurring in three steps according to the intra-particle diffusion kinetic model. The adsorption of AB-92 over G-MIL-101(Cr)@R is spontaneous and exothermic. The adsorption mechanism is mainly defined by electrostatic interactions. G-MIL-101(Cr)@R can adsorb the anionic dyes more efficiently than cationic dyes. It could also be reused for up to five cycles with an uptake efficiency of not less than 80 % without any change in its structure. Finally, G-MIL-101(Cr)@R is considered a superior adsorbent for anionic dyes. So, it will pave the way for developing MIL-101(Cr), based on organic and inorganic waste recycling, as an efficient adsorbent for removing organic dyes from wastewater.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Chong Xu,Fan Yang,Bijian Deng,Sai Che,Wang Yang,Ge Zhang,Yankun Sun,Yongfeng Li
A novel photocatalyst of rGO-wrapped Ti 3 C 2 /TiO 2 nanowires ((Ti 3 C 2 /TiO 2 )@rGO) was successfully synthesized to remove hexavalent chromium (Cr(VI)) and Rhodamine B (RhB) from wastewater. Among the prepared photocatalysts, (Ti 3 C 2 /TiO 2 )@rGO-15 showed the highest photocatalytic activity in both single and mixed pollutant solutions. The excellent photocatalytic activity was ascribed to the enhanced separation efficiency of e - and h + resulted from the Schottky barrier established in (Ti 3 C 2 /TiO 2 )@rGO. Ti 3 C 2 gathered the stimulated electrons originated from TiO 2 and further transferred them to rGO , thus enhancing the separation efficiency of e - and h + . Furthermore, different scavengers were employed to determine the reactive species involved in the photocatalytic reaction system. This work may provide a promising way to promote the separation efficiency of e - and h + via appropriate incorporation of co-catalyst.
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RSC Advances
·
2021
·Vol. 11
·期 15
·8963-8969
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IF 3.361
Zhiying Li,Congshu Li,Huiyun Yan
Designing exceptional probes to detect minute quantities of chromium(VI) is of huge importance for the safety and health of the human race. In this study, a green fluorescence emission probe (polyethylene Schiff base-chelated Fe2+ complex) was synthesized by a one-pot synthesis method for the highly selective and sensitive detection of Cr(VI) in an aqueous solution. The complex of polyethylene Schiff-Fe2+ was fully characterized, and it displayed satisfactory stability in the aqueous solution. The fluorescence emission could be quenched specifically by the introduction of Cr(VI) via the oxidation of the Fe2+-centered polyethylene Schiff base complex. The fluorescence intensity decreases linearly with the concentration of Cr(VI), and the corresponding detection limit was calculated to be 0.18 μM. Thus, the obtained fluorescence detection system could be used for Cr(VI) detection in tap water. These features provide potential uses of the as-prepared polyethylene Schiff-Fe2+ complex as a sensor for environmental applications.
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RSC Advances
·
2020
·Vol. 10
·期 53
·32249-32258
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IF 3.119
Fengli Liu,Huosheng Li,Dandan Liao,Yanhong Xu,Mingxia Yu,Shengwen Deng,Gaosheng Zhang,Tangfu Xiao,Jianyou Long,Hongguo Zhang,Yuting Li,Keke Li,Ping Zhang
Carbon quantum dots (CQDs) were synthesized via a hydrothermal method, in which extracellular polymeric substance (EPS) from anaerobic ammonium oxidation (anammox) granular sludge was used as a carbon precursor, while citric acid and ethylenediamine were applied as auxiliary carbon source and passivation agent, respectively. The synthesized CQDs, with orderly spherical shape and mean size of 7.15 nm, emitted blue fluorescent light under UV radiation of 365 nm. The CQDs had a high fluorescence yield (40.84%), with good water solubility and excellent spectroscopic properties. In addition, the CQDs exhibited selective, sensitive and distinctive fluorescence quenching behaviors for Cr(VI) and Mn(VII) in a PBS buffer solution (NaH2PO4–Na2HPO4) of pH 7, with a detection limit of 5.8 nM for Cr(VI) and 2.3 nM for Mn(VII). Owing to the nitrogen components from the EPS of anammox granules, the CQDs were well nitrogen-doped, promoting electron-transfer and leading to reduction between the CQDs and Mn(VII)/Cr(VI). These results indicate that CQD-based chemical sensing is a simple and efficient means for the fluorescence detection of Mn(VII) and Cr(VI).
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BIORESOURCE TECHNOLOGY
·
2020
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IF 7.539
Shuaizhong Zhang,Chengzhen Liu,Yongkai Yuan,Minghao Fan,Dandan Zhang,Dongfeng Wang,Ying Xu
A novel macroporous (~150 μm) double network hydrogel (TR/PAA) was prepared from tea residue and acrylic acid, and its performance was systematically evaluated. The static adsorption experiments showed that gel exhibited high selectivity and adsorption capacity, ultrafast kinetics (~10 min) for Cr(III), Pb(II) and Fe(III). The adsorption behavior showed heterogeneous and chemisorption process adsorption capacities of 206.19, 253.16, and 94.88 mg g −1 for Cr(III), Pb(II) and Fe(III), respectively. In pluralistic systems, TR/PAA showed the adsorption order of Fe(III) > Cr(III) > Pb(II). Mechanism studies confirm that nitrogen and oxygen-containing functional groups play a major role in the adsorption process. In the fixed-bed column experiments, the treatment volume of simulated wastewater reached 1400 bed volumes (BV) (21.6 L), producing only 7 BV (323 mL) eluent. This work provides a new avenue for the combination of TR/PAA reuse and heavy metal removal, which is expected to be applied in actual wastewater treatment.
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NANOTECHNOLOGY
·
2021
·Vol. 32
·期 39
·395703
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IF 3.874
Zhihua Li,Xin Ding,Bing Yu,Yu Min,Bin He,Youqing Shen,Hailin Cong
Near-infrared (NIR) emission materials can be widely applied in various fields, such as food detection, imaging, treatment, electronic products. With the trend of miniaturization of equipment, smaller materials are needed. In this work, we successfully synthesized a series of M2Ga2GeO7:N3+ (M = Ca, Ba, Sr; N = Cr, Nd, Er) samples and then focused on the study of Nd3+ doped Sr2Ga2GeO7 (SGGO). A series of SGGO:xNd3+ sub-micron phosphors were prepared via a microwave-assisted sol–gel process combined with subsequent calcination at 750 ℃, and the structural information and luminescent properties were systematically studied. SGGO is a representative tetragonal crystal and belonging to the space group of P4¯21m (113). The Nd3+ ions occupy eight-coordinated Sr2+ sites in the crystal lattice. From SEM analysis, the average particle size distribution is 219.7 ± 41.4 nm. The sub-micron phosphors have rich excitation spectra ranging from 350 nm to 850 nm and can produce multiband NIR emissions of 1331, 1056, and 905 nm when excited by ultraviolet and NIR light. The maximum emission intensity was obtained by optimizing the doping ratio of Nd3+ ions. A commercial chip was then utilized to fabricate light-emitting diodes (LEDs) to verify its application potential in NIR-II mini-LEDs. Compared with blue light LEDs, the as-prepared LEDs had good imaging penetration depth and could be clearly observed under 10 mm of chicken breast coverage. The maximum imaging penetration depth can be 33 mm.
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CHEMICAL ENGINEERING JOURNAL
·
2019
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IF 8.355
Bin Ou,Jixiao Wang,Ying Wu,Song Zhao,Zhi Wang
Magnetic and recyclable calcined CoFe-LDH/g-C 3 N 4 catalyst was prepared by co-precipitation and calcination method, and used as a multifunctional material to remove hexavalent chromium (VI) via the synergistic effect of adsorption and photocatalysis. The calcined CoFe-LDH provide surface adsorption in the composite, which could lead to the adsorption of Cr (VI) with high adsorption capacity and fast speed. The g-C 3 N 4 nanosheets have high photocatalytic activity in situ for the composite to reduce Cr (VI) into Cr (III). The results demonstrated that 60% Cr (VI) (50 mg L −1 ) can be adsorbed by the nanocomposite in 10 min and the removal efficiency of Cr (VI) reached 100% in 90 min under visible light irradiation by adsorption and photocatalysis. In addition, the calcined CoFe-LDH/g-C 3 N 4 exhibits a mostly pore size about 2.58 nm, large specific surface area (101.61 m 2 g −1 ) with the high structural stability and saturation magnetization (23.06 emu g −1 ), hence, could be easily recycled for ten subsequent runs with little activity loss.
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Royal Society Open Science
·
2018
·Vol. 5
·期 6
·
IF 2.504
Youning Chen,Wei Zhao,Huan Wang,Xiaohua Meng,Linjie Zhang
A novel polyamine-type starch/glycidyl methacrylate (GMA) copolymer with a high capacity for the adsorption of heavy metal ions was prepared via graft copolymerization of GMA and corn starch and a subsequent amination reaction between amino group of diethylenetriamine and epoxy group in GMA. The copolymers were characterized by Fourier transform infrared spectrometry, X-ray diffraction and scanning electron microscopy, and adsorption properties on modified starch of Cu(II), Pb(II), Cd(II) and Cr(III) were studied. By analysing the relationship between adsorption capacity and pH, adsorption isotherms and adsorption kinetics, it is proved that the adsorption of the four metal ions is mainly based on the chemical adsorption of coordination. The maximum adsorption capacities of the copolymer were up to 2.33, 1.25, 0.83 and 0.56 mmol g−1 for Cu(II), Pb(II), Cd(II) and Cr(III), respectively. The adsorption of the four concerned metal ions was hardly affected by common coexisting ions such as Na(I), K(I), Ca(II) and Mg(II), whereas it was slightly decreased when Fe(II) and Zn(II) coexisted in the solution, which illustrates the selective adsorption of Cu(II), Pb(II), Cd(II) and Cr(III) from wastewater. After 10 cycles of adsorption–desorption experiments, there was no significant change in the adsorption capacity, indicating that the polyamine-type starch/GMA copolymer has high adsorption capacity and good reusability.
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