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 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
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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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
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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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PubMed
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ACS Omega
·
2020
·
IF 2.87
Linlin Du,Peng Gao,Yide Meng,Yuanli Liu,Shangwang Le,Chuanbai Yu
Pyrrole (Py) is easily agglomerated during the polymerization process, affecting its performance. In this paper, polypyrrole/monodispersed latex sphere (PPy/MLS) composites were prepared using in-situ polymerization for the adsorption of hexavalent chromium (Cr(VI)). The specific surface area of PPy/MLS (39.30 m2/g) was increased relative to that of PPy (24.82 m2/g), thus providing more effective adsorption sites. In addition, the adsorption properties of Cr(VI) under different conditions, including Py content, pH of the aqueous solution, and PPy/MLS dosage, were investigated to reveal the adsorption mechanism. The results showed that PPy/MLS possessed high Cr(VI) adsorption capacities when the Py content was 50 wt %. The maximum adsorption capacity was 343.64 mg/g at pH 2.0 and 25 °C. Remarkably, the adsorbents exhibited an excellent removal rate of Cr(VI) after three cycles of adsorption–desorption (over 99%), suggesting that the adsorbents had exceptional recyclability. Furthermore, the adsorption process followed quasi-second-order kinetics and Langmuir isothermal adsorption model. The high adsorption performance, sustainability, and cost-efficiency make this adsorbent a promising candidate for large-scale Cr(VI) contaminant removal.
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WATER AIR AND SOIL POLLUTION
·
2020
·Vol. 231
·期 5
·1-10
·
IF 1.9
Wang Ning,Zhang Feiyan,Mei Qiufeng,Wu Ronglan,Wang Wei
The harm of chromium pollution to the environment has caused a widespread concern; hexavalent chromium is a toxic, cancerogenic, and genetically mutagenic contaminant to the human body; by contrast, trivalent chromium is almost non-toxic to the human body; therefore, it is a feasible method to reduce hexavalent chromium to trivalent chromium. Photocatalysis is a new environmentally friendly and harmless technology, which can transform pollutants into non-toxic or less toxic products. In this study, we synthesized TiO 2 /rGO/CuO ternary nanocomposites to treat hexavalent chromium pollution under visible light. Under optimal conditions, the photoreduction efficiency of 100 ppm hexavalent chromium solution could reach 100% in 80 min. The photoreduction rate of hexavalent chromium is 29.4 times than that of pure TiO 2 . The photocatalytic property of CuO in TG2C8 nanocomposites is attributed to accelerate the separation of electrons and holes and the efficient electron transfer through the rGO framework. We believe that TiO 2 /rGO/CuO composites have great potential in wastewater treatment.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Xian Zeng,Yuchen Wang,Xinyi He,Caocong Liu,Xi Wang,Xinpeng Wang
Being one of the most toxic pollutants commonly present in wastewater as soluble hexavalent chromium (Cr(VI)) specie, its concomitant adsorption and chemical reduction to relatively insoluble and less poisonous Cr(III) would be an effective strategy for remediation of Cr-polluted water. As such, a novel MXene-polyelectrolyte nanocomposite was typically synthesized for enhanced Cr(VI) removal. In detail, we applied polyethylenimine (PEI) to modify the Ti 3 C 2 T x surfaces and synthesized Ti 3 C 2 T x /PEI nanocomposites. The as-prepared composites were characterized by various methods such as SEM-EDX, N 2 sorption-desorption isotherm, XRD, FTIR, and XPS. Further, the Ti 3 C 2 T x /PEI was used to adsorb Cr(VI) for clarifying the kinetics, isotherms, and the effects of solution pH and coexisting ions on Cr(VI) removal by batch experiments. Our results show that coating of Ti 3 C 2 T x nanosheets with PEI regulates surface charge of the as-synthesized adsorbent and creates it with a three-dimensional network, allowing the fast electrostatic adsorption of Cr(VI) anions to positively charged surface over wide pH range of 1–10 and promoting to achieve improved removal capacity maximum up to 186.5 mg/g. The Cr(VI) adsorption data were well fitted by the pseudo-second-order kinetic and Langmuir isotherm models. In addition, Ti 3 C 2 T x /PEI also exhibits excellent selectivity for Cr(VI) anions over competing ones such as NO 3 − , Cl − , ClO 4 − , and SO 4 2− . Time-dependent reaction routes of Ti 3 C 2 T x /PEI nanocomposite toward Cr(VI) was studied by XPS, which confirmed the slow reduction of all sorbed Cr(VI) to Cr(III) in the dozens of hours and final in-situ Cr(III) immobilization, clarifying the sorption-reduction mechanism for Cr(VI) elimination. All these results suggest that Ti 3 C 2 T x /PEI nanocomposite prepared by reported surface-modification approach available for developing other functionalized adsorbents, may be a potential candidate for decontamination of Cr(VI)-polluted wastewater.
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Water Science and Engineering
·
2021
·
IF 0
Li Yin,Na Mi,You-ru Yao,Jing Li,Yong Zhang,Shao-gui Yang,Huan He,Xin Hu,Shi-yin Li,Li-xiao Ni
Ferrous sulfide (FeS) nanoparticles constitute an effective hexavalent chromium (Cr(VI)) treatment reagent. However, FeS nanoparticles aggregate easily, significantly limiting their engineering applicability. To overcome this shortcoming and further improve Cr(VI) removal efficiency, this study used tannic acid (TA) to modify FeS nanoparticles. The results demonstrated that TA-modified FeS nanoparticles, TA-nano-FeS, had a significantly reduced tendency to agglomerate, and maintained particle diameters of 10–100 nm, which were much shorter than diameters of FeS nanoparticles. In addition, TA-nano-FeS could combine the surface-active functional groups of TA. The maximum removal capacity of TA-nano-FeS was 381.04 mg/g, which was 2.92 and 1.83 times higher than those of TA and nano-FeS, respectively. Furthermore, the acidic condition was more beneficial for Cr(VI) removal, and the coexisting cations (Ca 2+ and Mg 2+ ) slightly decreased the removal efficiency of Cr(VI). Adsorption, reduction, and co-precipitation were the removal mechanisms, and the reaction products included FeCr 2 O 4 , Cr 2 O 3 , Fe 2 O 3 , Cr(OH) 3 , and S 8 . The results provided valuable information for the practical application of TA-nano-FeS in Cr(VI) removal.
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