INDUSTRIAL CROPS AND PRODUCTS
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2026
·
IF 6.4
Wendi Fang,Naixin Kang,Le Huang,Guiying Dai,Xueting Fei,Hongxu Liang,Hongxiang Hu
The reduction and precipitation of Cr during the adsorption process has always been challenging. In this study, S and N codoped lignin-based porous carbon (SN-LPC) was prepared by hydrothermal treatment and K-intercalation activation for the removal of Cr(VI). We discovered that SN-LPC has a new mechanism underlying the adsorption–reduction–readsorption of Cr(VI): First, SN-LPC adsorbs Cr(VI) onto its surface through the hydrogen bonding of -OH and the electrostatic adsorption of N functional group protonation; second, the S and N functional groups act as electron donors to induce the rapid reduction of Cr(VI) to Cr(III). Last, the –C–OR/C N groups on the SN-LPC surface and the S and N functional groups adsorb Cr(III) again, increasing the removal of Cr(VI). DFT calculations have revealed at the molecular structure level that SN-LPC has a more active electronic nature. Doping of S and N increases the affinity of SN-LPC for chromium, which explains why it can efficiently reduce and fix Cr(VI) and adsorb Cr(III). The removal process of Cr(VI) by SN-LPC is mainly multilayer adsorption dominated by chemical adsorption, with a maximum adsorption capacity of 967.45 mg/g (pH 2, 45 °C, and an initial concentration of 800 mg/L), and the removal efficiency is much greater than that of similar activated carbon and biochar. The 2D-FTIR–COS results further elucidated the sequence of functional groups of SN-LPC in the process of reducing Cr(VI), supporting the mechanism hypothesis of adsorption–reduction–readsorption. These findings highlight the significance of sulfur and nitrogen as key groups in reduction and adsorption and provide a reference for the underlying synergistic adsorption reduction mechanism used to repair Cr(VI).
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
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IF 9.221
Xiaodan Ding,Waqas Ahmad,Muhammad Zareef,Yawen Rong,Yunlian Zhang,Jizhong Wu,Qin Ouyang,Quansheng Chen
In this study, an ultra-sensitive and selective biosensor for the detection of enrofloxacin (ENR) in complex matrices has been established. The study intelligently converges the spectral properties of core-shell upconverted nanoparticles (UCNPs) and the excellent adsorption satiating aptitudes of metal organic frameworks (MOFs). The principle was based on the fluorescence resonance energy transfer (FRET) between aptamer-modified UCNPs as the donors and MOFs MIL-101(Cr) as the effective receptors. The spectral overlap between UCNPs fluorescence emission and MIL-101(Cr) absorption generated the FRET process under the action of π-π stacking interactions. The presence of ENR induced conformational changes in the aptamer via preferential binding, resulting in a decline in the nucleobase exposure on the surface of MIL-101(Cr) and eventually in the fluorescence recovery. The fluorescence intensity (FL) was enhanced as the ENR concentration was increased. The detection limit was 0.034 ng⋅mL −1 and the linear calibration curve between logarithmic ENR concentration and FL was achieved in the range of 0.1–1000 ng⋅mL −1 . The applicability of the platform for ENR recognition was confirmed in real fish and shrimp samples and further validated by a standard HPLC technique with no significant difference (p > 0.05). The current UCNPs-MIL-101(Cr) aptasensor proposes a fast, sensitive and quantitative detection approach for ENR in aquatic products.
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Materials Advances
·
2022
·Vol. 3
·期 20
·7546-7558
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IF 0
Hecheng Ma,Jianjun Liu,Yimeng Wang,Shengli Zuo,Yingchun Yu,Baoshan Li
Photocatalytic degradation has been developed as a promising strategy for environmental remediation. Black phosphorus (BP) has attracted much attention in the field of photocatalysis due to the adjustable bandgap and high carrier mobility. In this work, we constructed a flower-like BP nanosheet/P-doped BiOCl (BP/P-BiOCl) S-scheme heterostructure via a simple co-precipitation method. The physicochemical properties such as the crystallinity, morphology, chemical environment, and optical and electronic properties of the as-fabricated materials were analyzed by using different analytical techniques. SEM data indicated the successful formation of a flower-like structure of BP/P-BiOCl composites. X-Ray photoelectron spectroscopy data indicated the formation of P-doped BiOCl. X-Ray diffraction and high resolution-TEM data revealed the formation of a hierarchical BP/P-BiOCl heterostructure. The catalytic activity of the as-synthesized samples (15%-BP/P-BiOCl) was tested towards RhB degradation (96% of 20 ppm RhB solution) and Cr(VI) reduction (90% of 20 ppm Cr(VI) solution) under solar light illumination. We demonstrated the formation mechanism of a flower-like structure in which positively charged BPNs assembled with negatively charged P-BiOCl by electrostatic attraction. Furthermore, we revealed the S-scheme photocatalytic mechanism to prove the enhanced photocatalytic activity of BP/P-BiOCl composites. The photodegradation of phenol, radical species trapping experiments and charge transfer route test were performed to prove the formation of the S-scheme. This work provides a facile route for the construction of a flower-like S-scheme heterostructure photocatalyst for efficient solar light photocatalytic performance.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Hao Dong,Li Zhang,Penghui Shao,Zichao Hu,Ziwei Yao,Qingying Xiao,Dewei Li,Min Li,Liming Yang,Shenglian Luo,Xubiao Luo
Given the large amount of toxic Cr(VI) wastewater from various industries, it is urgent to take effective treatment measures. Adsorption has been regarded as highly desirable for Cr(VI) removal, but the effectiveness of most adsorbents is significantly dependent on pH value, in which precipitous performance drop and even structural collapse generally occur in strong acidic/alkaline aqueous. Thus, maintaining high adsorption performance and structural integrity over a wide pH range is challenging. To efficiently remove Cr(VI), we designed and prepared of an acid-base resistant metal-organic framework (MOF) Zr-BDPO, by introducing weak acid-base groups (-NH-, -N= and -OH) onto the ligand. Zr-BDPO achieved a maximum adsorption capacity of 555.6 mg · g −1 and retained skeletal structure at pH= 1–11. Interestingly, all these groups can generate conjugate acid-base pairs by means of H + and OH - in the external solution and then form buffer layer. The removal of Cr(VI) at a broad range of pH values primarily via hydrogen bonds between -NH- and -OH, and the oxoanion species of Cr(VI) is unusual. This strategy that insulating high concentrations of acids and bases and relying on hydrogen bonds to capture Cr(VI) oxoanions provides a new perspective for actual Cr(VI) wastewater treatment .
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Xiong Tao,Xiaowu Hu,Zhipan Wen,Yin’an Ming,Jun Li,Yunling Liu,Rong Chen
In this work, different Bi 2 S 3 nanostructures were prepared from various single and dual sulfide precursors via a solvothermal method. It was found that Bi 2 S 3 nanostructures prepared from dual sulfur precursors of L -cysteine and ammonium sulfide exhibited highest Cr(VI) removal ability with maximum Cr(VI) removal capacity of 148.95 mg/g in Cr(VI) solution (pH = 2). More importantly, the removal capacity strikingly increased to 223.33 and 240.25 mg/g in two kinds of actual industrial electroplating wastewater. By analyzing the components of actual electroplating wastewater and the results of control experiments in the absence and presence of different ions in Cr(VI) solution, it was found that SO 4 2- played a critical role in the Cr(VI) removal over Bi 2 S 3 . The addition of SO 4 2- could promote the conversion of Cr(VI) to Cr(III) on the surface of Bi 2 S 3 , thus leading to the enhanced Cr(VI) removal ability in actual electroplating wastewater. The Bi 2 S 3 maintained its original Cr(VI) removal ability after four cycles in the electroplating wastewater, indicating the moderate reuse ability of the sample. This work not only demonstrated an highly efficient nanomaterials for the Cr(VI) removal in industrial electroplating wastewater, but also provided an insight on the influence of the components in wastewater on Cr(VI) removal.
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JOURNAL OF COORDINATION CHEMISTRY
·
2021
·
IF 1.751
Milad Taheri
The synthesis and properties of new hybrid core-shell nanoparticles SiO2-HPW12O40@Fe3O4/EN-MIL-101(Cr) are reported. These hybrid nanomaterials were synthesized by binding of Keggin-type heteropolyacid (HPA) on diamine-activated Fe3O4 magnetic nanoparticles. The present work proposes an electroanalytical method for selective determination of losartan antihypertensive drug (LOS). Under optimal conditions, an electrochemical sensor was performed between the molecules in 0.1 M phosphate buffer (PBS) pH 6.0. Heterogeneous nanocatalysts can be easily separated from the reaction mixture using a magnet and used multiple times. The structure of the synthesized nanocatalyst was determined by various physicochemical techniques such as TEM, SEM, XRD, EDAX, TGA, and AFM.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 22
·13306-13319
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IF 12.732
Qian Yang,Huilin Wang,Fangbai Li,Zhi Dang,Lijuan Zhang
Chromium is recognized as one of the most harmful heavy metal pollutants. Facile and efficient Cr(VI) removal technology is an urgent need, but still a challenge. Here, a novel core–shell magnetic mesoporous polydopamine nanocomposite adsorbent (Fe3O4@mesoPDA) was prepared by in situ polymerization of dopamine on the surface of Fe3O4 nanoparticles. The adsorption of Cr(VI) was highly pH-dependent, and optimal Cr(VI) adsorption occurred at pH = 1.5 with a maximum adsorption capacity of 574.71 mg g−1. The adsorption kinetics results showed that the large-sized mesoporous polydopamine shell layers of Fe3O4@mesoPDA significantly increased the adsorption sites and removal rate of Cr(VI), and its inner core Fe3O4 nanoparticles could also accelerate Cr(VI) removal. The adsorption mechanisms of Fe3O4@mesoPDA were primarily redox reactions and also involved electrostatic interactions and coordination. Cr(VI) was mainly reduced to Cr(III) by catechol and imino groups of PDA shell layers, but the pathway of the superoxide radical reduction of Cr(VI) mediated by iron ions on the surface of Fe3O4 nanoparticles could promote the electron transfer between PDA shell layers and Cr(VI) and greatly improve the adsorption performance of Fe3O4@mesoPDA, especially under weak acid conditions. Meanwhile, newly generated Cr(III) was further immobilized onto Fe3O4@mesoPDA through coordination with N and O functional groups and recovered by magnetic separation in favor of decreasing the environmental hazard of heavy metal Cr. Overall, this work can provide new insights into the interaction mechanisms between PDA-based adsorbents and Cr(VI), and also offers a significant reference for the subsequent preparation of Cr(VI) adsorbents.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jiayu Zhang,Mingwei Yan,Guangchao Sun,Kaiqi Liu
A novel and cost-effective TiO 2 nanofiber membrane on porous fly ash ceramic as support (TNM-PFACS), using fly ash, graphite, and industrial rutile as raw materials, was successfully obtained based on the semi-dry press and hydrothermal process. The phase composition and micro-morphology of TNM-PFACS were characterized and analyzed by XRD, EDS, SEM, and TEM. Furthermore, it was discussed about simultaneous removal of heavy metal ions (Cu(II), Cd(II), and Cr(VI)) and rhodamine B, involving the adsorption and photodegradation process. The results indicated that the removal rate (90.15%) and adsorption capacity (9.56 mg/g) of Cu(II) was maintained, while the adsorption of Cd (II) was inhibited. In the photodegradation process, rhodamine B promoted the reduction of highly toxic Cr(VI) to Cr(III), and the highest removal rate of Cr(VI) reached 97.09%. TNM-PFACS presented simultaneous removal of heavy metal ions and rhodamine B through synergism and antagonism in the adsorption and photodegradation process, which can be applied as a simpler and cost-effective material in industrial wastewater treatment.
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ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Yanqiu Zhang,Jiaxiang Liu,Xiaohan Wu,Wenquan Tao,Zhuo Li
Accurate, simple and quick detection methods for Cr(VI) detection are urgently needed for water quality monitoring. Herein, a novel and facile method of detecting Cr(VI) (Cr 2 O 7 2− /CrO 4 2− ) ions is developed via the fluorescent detection technology based on metal-organic frameworks (MOFs) doped with sulfur quantum dots (SQDs) (SQDs@UiO-66-NH 2 ). The blue-light-emitting SQDs@UiO-66-NH 2 composites exhibit excellent fluorescent properties in water environment with high quantum yield (68%) and ideal fluorescent stability, thus demonstrating excellent potential for serving as a chemical sensor. After characterizing the performance and stability of SQDs@UiO-66-NH 2 , qualitative and quantitative detection of Cr 2 O 7 2− and CrO 4 2− ions was successfully conducted. The fluorescence of SQDs@UiO-66-NH 2 composites in aqueous solution was quenched effectively with more than 90% quenching efficiency by Cr(VI) via the inner filter effect. The detection system provides considerable advantages such as rapid response (10 s), high sensitivity with a low detection limit of 0.16 μM in a broad linear range of 0–200 μM (R 2 = 0.99) for Cr 2 O 7 2− and 0.17 μM for CrO 4 2− in a broad linear range of 0–220 μM (R 2 = 0.99), high selectivity and reproducibility for at least five cycles with simple washing with alcohol. In practical applications, the sensor showed rapid response, high sensitivity and excellent recoveries (96.7%–105.4%) for detecting Cr 2 O 7 2− in real water samples. Furthermore, a SQDs@UiO-66-NH 2 -based fluorescent test paper was successfully developed, providing a simple, reliable and portable method for Cr(VI) (Cr 2 O 7 2− /CrO 4 2− ) detection in water environment.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Xingyu Liu,Lei Yang,Haitong Zhao,Wei Wang
The pollution of hexavalent chromium (Cr(VI)) in soil is a serious environmental issue. Herein, nanoscale zero-valent iron (NZVI) supported on rice husk-derived biochar (RBC) was employed as an efficient remediation material to minimize the harm of Cr(VI) in soil. A one-step carbothermal reduction method was used instead of the conventional wet chemistry method for material preparation in this study. Rice husk, an agricultural waste, was adopted as the carbon source (reductant) and support for nanometal synthesis simultaneously, so that the NZVI could be in-situ generated on the acquired biochar during the pyrolysis process. By pyrolyzing at 800 °C, the obtained biochar-supported nanoscale zerovalent iron (NZVI-RBC) exhibited high thermal stability and oxidation resistance. In the treatment of contaminated soil, the Cr(VI) no longer leached out from the soil after a complete removal of Cr(VI) (62.4 mg/L) from soil leachate in 120 min when the used NZVI-RBC dosage was above 8% of the soil in weight. This long-term remediation effect of NZVI-RBC may be related to the electron shuttle function of biochar. Furthermore, the bioavailability of Cr in the contaminated soil was significantly decreased. The present study provided a simple, feasible, and sustainable alternative to make full use of the agricultural waste resource to synthesize composite remediation agent containing NZVI and remediate Cr(VI) contaminated groundwater and soil.
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Clean Energy
·
2019
·Vol. 4
·期 1
·58-66
·
IF 0
Gan Qiuping,Wang Benzhi,Chen Judan,Tian Jianniao,Isimjan Tayirjan Taylor,Yang Xiulin
The developing high-efficiency urea fuel cells have an irreplaceable role in solving the increasingly severe environmental crisis and energy shortages. The sluggish six-electron dynamic anodic oxidation reaction is the bottleneck of the rapid progress of urea fuel-cell technology. To tackle this challenge, we select the NiCr bimetallic system due to the unique synergic effect between the Ni and the Cr. Moreover, better conductivity is assured using carbon nanotubes (CNTs) as the support. Most importantly, we use a simple hydrothermal method in catalyst preparation for easy scale-up at a low cost. The results show that the hybrid catalysts of NiCrx-oxide-CNTs with different Ni/Cr ratios show much better catalytic performance in terms of active surface area and current density as compared to that of Ni-hydro-CNTs. The optimized NiCr2-oxide-CNTs catalyst exhibits not only the largest electrochemically active surface area (ESA, 50.7 m2 g−1) and the highest urea electrocatalytic current density (115.6 mA cm−2), but also outstanding long-term stability. The prominent performance of the NiCr2-oxide-CNTs catalyst is due to the combined effect of the improved charge transfer between Ni and Cr species, the large ESA, along with an elegant balance between the oxygen-defect sites and hydrophilicity. Moreover, we have proposed a synergistically enhanced urea catalytic mechanism.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Qing Li,Yong You,Xingyu Hu,Danqing Lu,Qian Wen,Gang Yu,Wenlei Wang,Tao Xu
This work innovatively used cellulose nanofibers as a photocatalyst carrier, which could recycle nano-photocatalysts and minimize nanoparticle aggregation. The morphology, structures, chemical composition, optical-electronic properties and photocatalytic performance of amino-modified carbon quantum dots-ZnO/cellulose nanofiber (N-CQDs-ZnO/CNF: ZCH-2) hydrogel were characterized by SEM, TEM, BET, EDS , XRD, FTIR, UV–vis, XPS, PL and other techniques. The mechanism of Cr(VI) adsorption synergistic photoreduction by ZCH-2 was discussed in detail. The results showed that the prepared ZCH-2 had excellent removal performance for Cr(VI). After 120 min of adsorption and 40 min of photoreduction, the removal efficiency of Cr(VI) was 98.9 %. Compared with ZnO/CNF hydrogel, the adsorption performance of ZCH-2 increased by 268 % and the photoreduction performance increased by 116 %. The adsorption of Cr(VI) by ZCH-2 was controlled by electrostatic attraction and chemical adsorption. The photoreduction kinetic constant of ZCH-2 was 0.106 min −1 , which was 8.9 times that of ZnO/CNF hydrogel. The N-CQDs in ZCH-2 could form N-CQDs-metal complexes with Cr(VI), resulting in fluorescence quenching , so Cr(VI) could be visually identified by fluorescence changes. This study provides a new idea for the design and optimization of a new multifunctional hydrogel with efficient adsorption-photoreduction-fluorescence recognition.
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