E-POLYMERS
·
2023
·Vol. 23
·期 1
·
IF 3.7
Xiaoyu Jie,Bing-Chiuan Shiu,Huazhong Wu,Yuchi Zhang,Yuansong Ye,Chunxiang Lin,Run Fang
Chitosan (CS) is widely used in the treatment of wastewater containing metal ions. However, the poor stability in acidic aqueous solutions severely limits its application in many practical scenarios. In this work, a CS-based composite nanofiber membrane was prepared by electrospinning using urushiol, a natural biomaterial, as the cross-linking agent. The application of the CS-urushiol (CS-U) membrane in the adsorption and recovery of Cr( vi ) in wastewater was systematically studied. The CS-U membrane showed great resistance to strongly acidic and oxidative environments, and the adsorption process combined two mechanisms of electrostatic attraction and redox reaction. Due to the nanoscale fibers, porous structure, and strong acid resistance, the CS-U membrane adsorbed Cr( vi ) rapidly and efficiently in both batch and continuous modes. Moreover, the adsorption capacity and selectivity of the CS-U membrane for Cr( vi ) could be maximized simultaneously by adjusting the solution pH, promoting the recovery of high-purity Cr 2 O 3 .
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Journal of the Taiwan Institute of Chemical Engineers
·
2021
·
IF 5.876
Anqi Sun,Ying Wu,Zhenjiang He,Peng Bai,Jiafei Lyu,Xianghai Guo
The flexible metal-organic framework MIL-53(Cr) has been demonstrated to be an efficient adsorbent for liquid phase adsorption and separation, while the effect of this attractive “breathing effect” on its performance remains uncertain. In this research, by increasing the amount of introduced water, MIL-53(Cr) first shrank into a narrow pore form through bound water and then reopened due to the introduction of free water. Using MIL-53(Cr) with diverse amounts of water as an adsorbent, the liquid-phase adsorption and separation of C8 aromatics, including o -xylene (OX), p -xylene (PX), m -xylene (MX) and ethylbenzene (EB), was manipulated by the pre-adsorbed water in MIL-53(Cr). Pre-adsorbing water in MIL-53(Cr) induced a preference reversal between MX and PX, where dry samples preferentially adsorbed MX, while high-water-addition samples preferred PX instead. In addition, the reopened MIL-53(Cr) with high water addition hardly adsorbed EB, thereby increasing the selectivity of xylene isomers to EB. A longer equilibrium time was observed on MIL-53(Cr) with high water addition, during which the adsorption preference shifted from OX to MX to PX. Further molecular simulation provided a microscopic explanation that water molecules in the pores tended to package around MX and EB, hindering their interaction with frameworks or other adsorbates.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 27
·50642
·
IF 3.125
Zhimei Wei,Shouyu Zhang,Xiaojun Wang,Shengru Long,Jie Yang
Cr (VI) is a highly toxic pollutant to humans, to achieve high adsorption capacity, easy recovery, and good reusability, polyethersulfone/polydopamine (PES/PDA) ultrafine fibers were prepared successfully. A series of preparing effect factors were investigated systematically and the optimum one is 8.5 pH value at room temperature and 2 g/L dopamine concentration. And then they were used as an adsorbent for the removal of Cr (VI) ions from wastewater. The effect factors pH, the adsorbent dosage, and time were discussed on Cr (VI) adsorption process and the Cr (VI) adsorption behavior was investigated. It is found that the maximum Cr (VI) adsorption capacity is 115.2 ± 4.8 mg/g at pH = 3 using 0.06 g PES/PDA with 80 mins. The Cr (VI) adsorption process followed the pseudo-second-order model (r 2 ≥ 0.99) and adsorption isotherms were fitted to the Langmuir model (R 2 ≥ 0.999). Furthermore, the Cr (VI) adsorption mechanism was supposed according to the X-ray photoelectron spectroscopic results. Finally, PES/PDA ultrafine fibers were considered to be a promising adsorbent with good stability (decomposing temperature, 356°C), high adsorption efficiency (112.1 ± 2.5 mg/g), and good reusability (three times) on the coexistence of anions and the actual industry wastewater environment.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Dan Fang,Tingting Xu,Leyi Fang,Huan Chen,Yangyang Huang,Huanyu Zhang,Zhuoyue Miao,Chun Mao,Bo Chi,Hong Xu
Fast and accurate test Cr(VI) in the whole blood is particularly critical for the treatment and prevention of Cr(VI) poisoning. Here, a blood compatible, high-efficient sensor based on the magnetic glassy carbon electrode (MGCE) that modified by conductive polyaniline (PANI), heparin and tannin modified Fe 3 O 4 nanoparticles (magnetic tannin-modified adsorbent, MTA) with high adsorption ability toward Cr(VI) ions was developed. Results indicated the designed PANI/Hep/MTA/MGCE exhibited high sensitivity for Cr(VI) in the concentration range of 10 − 7 to 10 −4 ppm with a 0.87 μM detection limit (3σ method). In particular, this prepared sensor not only exhibited outstanding electrochemical performance for Cr(VI) detection, but also possessed good antibiofouling characteristics due to the existence of heparin, which can provide guarantee for direct detection of Cr(VI) in the whole blood.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Zeqing Long,Guangming Zhang,Hongbiao Du,Jia Zhu,Jinwei Li
Recently, the photocatalytic reduction of Cr(VI) has been extensively studied. Herein, we successfully prepared the BiOBr-Bi 2 S 3 heterojunctions with high photocatalytic Cr(VI) reduction performance using an ion exchange method. The optimal BiOBr-Bi 2 S 3 heterojunction (prepared with BiOBr, pH of 6.0, 2 mmol Na 2 S 2 O 3 ·5H 2 O,) achieved 100% removal of Cr(VI) within 12 min. The performance of photo-reduced Cr(VI) was about 28.9 and 184.6 times higher than that of pure Bi 2 S 3 and BiOBr, respectively. Besides, BiOBr-Bi 2 S 3 heterojunctions had a good adsorption efficiency for Cr(III), suggesting that they could be applied as bifunctional photocatalyst. The formation process and photoelectric properties of the BiOBr-Bi 2 S 3 heterojunctions were revealed by a series of characterizations. In conclusion, this work reported the synergistic effect of adsorption and photocatalysis of the BiOBr-Bi 2 S 3 heterojunctions for Cr removal for the first time, suggesting that the BiOBr-Bi 2 S 3 heterojunctions could act as a novel photocatalytic adsorbent to treat the Cr(VI)-containing wastewater.
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PubMed
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 151
·期 9
·2560-2569
·
IF 3.186
Han Jishu,Wang Ying,Liu Ying,Bai Jiayu,Zhao Ruiyang,Wang Lei
In this paper, novel CdSe/NH 2 -MIL-101(Cr) nanocomposites for photocatalytic hydrogen production were synthesized. When the prepared NH 2 -MIL-101(Cr) MOFs were modified with CdSe QDs, the photocatalytic hydrogen production amount was significantly increased and reached to 17,664 μmol g −1 in 7 h. The formation of CdSe/NH 2 -MIL-101(Cr) nanocomposites enhanced the light absorption intensity, broadened the visible light absorption range, promoted the transfer of photogenerated electrons and inhibited the recombination of photogenerated electron–hole pairs, then effectively improved the photocatalytic hydrogen production performance. In addition, the CdSe/NH 2 -MIL-101(Cr) nanocomposites exhibited high cycle stability, which was beneficial to the practical application in photocatalytic hydrogen production. Graphic Abstract
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NANO
·
2020
·
IF 1.566
Heng Chen,Mengbing Cui,Cuilan Miao,Gairong Chen,Yongchun Zhang
In this work, the function of 4-nitroimidazole (4-NIm) in the formation of Cr-MIL-101 was confirmed. It was found that 4-NIm is an effective additive in the formation of Cr-MIL-101 synthesized at lower temperature. The investigation of crystallization time showed that 4-NIm can prevent Cr-MIL-101 phase converting into Cr-MIL-53 phase. The effect of concentration of 4-NIm on the morphology and the yield of Cr-MIL-101 may therefore be explained by increasing the nucleation rate. The investigation of crystallization temperature revealed that 4-NIm changes the synthesis temperature range of Cr-MIL-101 into 423–463 K. The assistant function of 4-NIm was played through interaction with H + and NO 3 − in the synthesis system, which may lead to enhancement of the deprotonation of H 2 BDC.
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Journal of Cleaner Production
·
2020
·
IF 7.246
Huiting Zeng,Honghu Zeng,Hua Zhang,Asfandyar Shahab,Kang Zhang,Yanqin Lu,Iqra Nabi,Faiza Naseem,Habib Ullah
Biochar, due to its ability to remediate heavy metals and organic contaminants from polluted water is considered as an economic adsorption material. This work involved pyrolysis driven eucalyptus carbon (EC) to produce eucalyptus activated carbon (AC) through a novel mechanism of using phosphoric acid (H 3 PO 4 ) and its subsequent testing for efficient adsorption of Cr (VI) from aqueous environments . Advanced characterization techniques like XRD, SEM, BET, FTIR, and XPS were employed to characterize the structure and composition of EC and AC. The AC could remove 99.76% of Cr(VI), which was higher than EC removal rate of 25.24%. The surface area of AC increased by almost 5 times 1265.56 m 2 /g compared to EC (253.25 m 2 /g). The removal rate of Cr(VI) was highly influenced by adsorption capacity , pH, adsorption time, temperature, kinetics, and isotherm. Reaction rate kinetics , isothermal , and thermodynamic analysis revealed that the adsorption curve of AC fits well with the quasi-second-order kinetic model . AC adsorption process was a spontaneous endothermic reaction limited by intraparticle diffusion and a combination of chemical and physical adsorption.
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Micro & Nano Letters
·
2020
·Vol. 16
·期 1
·58-63
·
IF 0.975
Junying Si,Hong Wang,Baoshuang Wu,Guangshuo Wang,Jiajia Yang,Zhongchao Huo,Tian Tian,Xuelin Zhao,Shuai Han
A new type of orange emission carbon dots (OCDs) was prepared by hydrothermal method using 1,2,4-triaminobenzene and p-aminobenzenesulphonic acid as precursors. TEM characterization showed that the new OCDs were uniform in size with an average particle size of 4–7 nm. Infrared spectroscopy and XPS analysis showed that the surface of the OCDs were rich in hydrophilic functional groups. Fluorescence spectroscopy results showed that the obtained OCDs exhibited excellent fluorescence with an absolute quantum yield as high as 14.9%. The OCDs were further applied to the detection of metal ions. It was found that the fluorescence of OCDs could be effectively quenched by Cr(Ш) with a detection limit of 0.38 μ m . Notably, the obtained OCDs have been successfully used for fluorescence detection of Cr 3+ ions in cell level.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 47
·20806-20811
·
IF 3.288
Dongxiu Wang,Lin Zhang,Pengxia Li,Junfen Li,Chuan Dong
The plant Sophora flavescens Ait was used to prepare carbon nanodots (CDs) which exhibited high fluorescence quantum yield (35.2%). The CDs were remarkably quenched by chromium(VI) (Cr(VI)) and acted as an “on–off” fluorescent probe to realize the real sample detection of Cr(VI) at pH 6.0. The linear range was 0.06–40 μM and the detection limit was 20 nM. In addition, it was found that the fluorescence recovered again when Cr(VI) was redoxed by ascorbic acid (AA), and the recovery degree was linear with the amount of AA from 0.1 to 4.0 mM. With a low detection limit of 80 μM, the system was satisfactorily used to detect AA in several fruits. In conclusion, the proposed “on–off–on” fluorescent probes based on the synthesized CDs were simple, of low-cost and concise for the sequential detection of two targets.
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CELLULOSE
·
2020
·Vol. 27
·期 14
·8121-8134
·
IF 4.21
He Hui,Lu Qin,Huang Huanhuan,Xue Fei,Lin Wenju,Zhou Hang,Wei Wei
A biomass bagasse-based hyperbranched adsorbent (BF/HBPA) with high amino density was synthesized using epichlorohydrin (ECH) to cross-link hyperbranched polyamine (HBP-NH 2 ) with bagasse fibre powder (BF). Using this kind of “cross-linking” procedure to synthesize the bagasse-based hyperbranched adsorbent could overcome the disadvantages of the low amino density in the stepwise grafting process, avoiding the requirement of strict preparation conditions and a complicated synthesis process. Thus, the as-prepared BF/HBPA could completely remove low-level Cr(VI) (1.6 mg/L), and showed an outstanding adsorption capacity (330.7 mg/g) for Cr(VI) at high Cr(VI) concentrations (108.3 mg/L) under 30 °C and pH value of 2. BF, as the framework of BF/HBPA cross-linking network, enhanced the adsorption rate (arrived at adsorption equilibrium in 15 min) for Cr(VI) on BF/HBPA. Moreover, BF/HBPA showed a promising regeneration property. After reusing for 10 cycles, the removal rate of BF/HBPA was maintained above 96%. The adsorption mechanism of physical electrostatic adsorption, chemical chelating adsorption and oxidation-reduction were all attributed to the complete removal of low-level Cr(VI) to the Safe Drinking Level (US EPA) (0.05 mg/L).
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Meng Wang,Wenqiang Yan,Meilin Chu,Ting Li,Zhiyong Liu,Yueqi Yu,Yangyang Huang,Tianyu Zhu,Mimi Wan,Chun Mao,Dongquan Shi
The hazard of hexavalent chromium (Cr(VI)) from environmental pollution and medical implanted metal has been recognized widely. However, removal of trace amount of Cr(VI) in the blood circumstance faces tremendous difficulties for that most of Cr(VI) located in erythrocytes, thus there is almost no literature to report the removal of Cr(VI) in blood. Herein, a removal strategy, named as reduction–adsorption–separation, is proposed to realize the removal of Cr(VI) in blood. First, magnetic core–shell mesoporous nanocomposite is fabricated by using Fe3O4 nanoparticles as magnetic core and mesoporous silica (MS) as shell, hyperbranched polyamide (HPA) as mesoporous channel modifier and ascorbic acid (ASC) as the reductant drug loaded in the mesoporous channels, which is also denoted as Fe/MS/HPA/ASC. Then, on the basis of the bionic idea, the erythrocyte membrane (EM)-wrapped Fe/MS/HPA/ASC to protect ASC from deactivation is obtained and named as the therapeutic agent (Fe/MS/HPA/ASC@EM). During removal process, the therapeutic agent can enter in erythrocytes to use ASC to reduce Cr(VI) to Cr(III) and HPA in mesoporous channels to adsorb Cr(III) and can then be recollected from blood by magnetic separation. Finally, an animal model of blood Cr(VI) poisoning is constructed and used to test the removal ability of Cr(VI) from pig blood in vivo, verifying the effectiveness of this blood Cr(VI) removal strategy, providing a possible way to design more efficient and biosafe therapeutic agents for blood purification.
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