CHEMICAL ENGINEERING JOURNAL
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2016
·
IF 5.31
Lei Wang,Changbo Zhang,Feng Gao,Gilles Mailhot,Gang Pan
Algae as an abundant natural biomass, more attention has been paid to explore its potential application in environmental pollutants treatment. This work prepared the algae-TiO 2 /Ag bionano hybrid material by loading algae cells on the ultrafine TiO 2 /Ag chitosan hybrid nanofiber mat. For the first time, the synergistic photocatalytic effect of fresh algae and TiO 2 /Ag nanomaterial was investigated by removal of Cr(VI). The addition of algae significantly improved the photo-removal of Cr(VI) in the system with TiO 2 /Ag hybrid nanomaterial under visible light irradiation. Meanwhile, the photocatalytic mechanism was studied. The photogenerated reactive oxygen species were quantified and the addition of algae apparently decreased the yields of OH to 31.0 μM, while improved the yields of 1 O 2 and O 2 − in the reaction system with TiO 2 /Ag hybrid nanofiber mats. The change of superoxide dismutase activity and malondialdehyde content in algae indicated that TiO 2 /Ag could impose oxidative stress and cause lipid peroxidation in algae cells. During the course of irradiation, algae released substances could act as scavenger for holes, thus inhibited the recombination of hole/electron and enhanced the photocatalytic reduction of Cr(VI) by electrons on TiO 2 surface. Algae was simultaneously photodegraded in the system and the resulting O 2 − , organic free radicals could promote the reduction of Cr(VI). This functional hybrid nanofiber mat was easily recovered and maintained a great photocatalytic activity on the five successive cycles. This algae-photocatalyst hybrid material has promising applications potential in heavy metal removal and organic pollutants treatment.
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JOURNAL OF HAZARDOUS MATERIALS
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2017
·
IF 6.065
Sheng Luo,Fan Qin,Yin’an Ming,Huiping Zhao,Yunling Liu,Rong Chen
Hazardous hexavalent chromium removal from wastewater is an urgent issue in industry environmental pollution. In this work, hollow Bi 2 S 3 nanospheres have been successfully synthesized from unique Bi 2 O 3 porous nanospheres via Kirkendall effect through hydrothermal process. It was found that the sulfur source and the initial Bi 2 O 3 templates played key roles in the formation of the uniform morphologies and structures through an anion exchange process. Compared with other Bi 2 S 3 samples, the synthesized hollow Bi 2 S 3 nanospheres exhibited much enhanced photocatalytic ability for Cr(VI) photoreduction. XPS analysis demonstrated that Cr(VI) was reduced to less harmful Cr(III) species over hollow Bi 2 S 3 nanospheres under visible-light irradiation. More importantly, the hollow Bi 2 S 3 nanospheres remained high efficiency and good stability in the recycling Cr(VI) photoreduction, and exhibited remarkable Cr(VI) removal ability in actual electroplating industry wastewater treatment.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2016
·
IF 3.138
Pan Hu,Jing Wang,Ruihua Huang
In this study, simultaneous removal of Cr(VI) and Amido Black 10B (AB10B) using quaternized chitosan coated bentonite was investigated by a batch method. The factors affecting adsorption process such as pH, adsorbent dosage, contact time and initial concentration and the interaction of two components in binary solutions have been studied. The results showed that the antagonism effect existed between Cr(VI) and AB10B in binary systems. The equilibrium time for Cr(VI) adsorption was less than the one for AB10B adsorption. The maximum adsorption capacities of the modified bentonite, according to the Langmuir isotherm model were 847.5 mg/g for AB10B and 66.6 mg/g for Cr(VI) at 298 K. The experimental results demonstrated that both Cr(VI) and AB10B were well described by the pseudo-second-order model. Thermodynamic study depicted that the adsorption of Cr(VI) and AB10B onto the modified bentonite was both spontaneous. The adsorption for Cr(VI) was exothermic while the one for AB10B was endoth- ermic in nature.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Yaru Li,Zhongmin Liu,Yongchuan Wu,Jitao Chen,Jingyu Zhao,Fengmin Jin,Ping Na
Carbon dots-TiO 2 nanosheets (CDs-TNs) composites were synthesized by hydrothermal method and applied for the first time in photoreduction of Cr(VI) under sunlight illumination. The materials were characterized by transmission electron microscope, X-ray diffraction, thermogravimetric analysis, Fourier transform infrared spectrometer, and X-ray photoelectron spectroscopy analysis. The results confirmed that CDs are successfully incorporated with TNs through Ti O C bonds. With the introduction of CDs, CDs-TNs composites exhibit excellent photoreduction performance of Cr(VI), which is higher than that of TNs, P25 and CDs-P25. The unique upconversion property and electron transfer property of CDs play essential roles on light harvesting and charge carriers transferring in the photoreduction process. Most importantly, CDs could facilitate the formation of H 2 O 2 , leading to the consumption of holes. As a result, the recombination of photoinduced electron-hole pairs is hindered and photoreduction activity of CDs-TNs is promoted.
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JOURNAL OF HAZARDOUS MATERIALS
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2017
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IF 6.065
Qinghua Xu,Yulu Wang,Liqiang Jin,Yu Wang,Menghua Qin
A novel nanocomposite based on black wattle (BW) tannin and nanocellulose was prepared and applied in heavy metal ions adsorptive removal from aqueous solutions. Firstly, nanocrystalline cellulose was oxidized by sodium periodate to get dialdehyde nanocellulose (DANC). BW tannin was then covalently immobilized onto DANC, which was used as both the matrix and crosslinker, to obtain tannin-nanocellulose (TNCC) composite. The resulting nanocomposite was characterized using FTIR, AFM, and TG. The successful immobilization was confirmed by the chromogenic reaction between FeCl 3 and TNCC and FT-IR analysis. AFM images revealed that TNCC was ellipsoidal particles with lengths ranging from 100–400 nm. Zeta potential measurement showed that TNCC was negative charged at a pH range from 1–12. Compared to the original tannin, the thermal stability of TNCC was slightly increased by the addition of nanocellulose. TNCC demonstrated the maximum adsorption efficiency at pH 2 for Cr(VI) and pH 6 for Cu(II) and Pb(II), respectively. The adsorption for these three metal ions followed pseudo second-order kinetics, indicating the chemisorption nature. The adsorption isotherms all fitted well with the Sips model, and the calculated maximum adsorption capacities were 51.846 mg g −1 , 53.371 mg g −1 and 104.592 mg g −1 for Cu(II), Pb(II) and Cr (VI), respectively.
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RSC Advances
·
2014
·Vol. 4
·期 86
·45920-45929
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IF 3.708
Lisha Tan,Jiang Xu,Xiaoqin Xue,Zimo Lou,Jin Zhu,Shams Ali Baig,Xinhua Xu
Silica-coated magnetite (Fe3O4@SiO2) nanoparticles functionalized with amino, imino and sulfonic groups (Fe3O4@SiO2–mPD/SP) were successfully synthesized via a facile chemical oxidative polymerization of m-phenylenediamine (mPD) and m-sulfophenylenediamine-4-sulfonic acid (SP) monomers, and utilized for selective removal of Pb(II) and Cr(VI) from aqueous solutions. It was revealed by the characterizations that the polymers formed on Fe3O4@SiO2 nanoparticles were the true copolymers with a mPD–SP unit, rather than a mixture of mPD and SP homopolymers. Fe3O4@SiO2–mPD/SP nanocomposites could be easily separated from aqueous solutions within 30 s. The maximum adsorption capacities of Pb(II) (83.23 mg g−1) and Cr(VI) (119.06 mg g−1) on Fe3O4@SiO2–mPD/SP nanocomposites were obtained at the mPD/SP molar ratios of 95 : 5 and 50 : 50, respectively. Moreover, satisfactory selective removal of Pb(II) and Cr(VI) from their mixtures with Cu(II) and Ni(II) ions were exhibited by the Fe3O4@SiO2–mPD/SP (95 : 5) and Fe3O4@SiO2–mPD/SP (50 : 50), respectively. The Pb(II) adsorption equilibrium was reached within 5 min by Fe3O4@SiO2–mPD/SP (95 : 5). The adsorption data of Pb(II) and Cr(VI) were both fitted well to the Freundlich isotherm and followed the pseudo-second-order kinetic model. The adsorption mechanism of Pb(II) and Cr(VI) on Fe3O4@SiO2–mPD/SP nanocomposites included five processes, namely: ion-exchange, complexation adsorption, reduction reaction, electrostatic attraction and physical adsorption. The enhanced adsorption performance of nanoparticle-based magnetic adsorbents for selective removal of heavy metal ions can be achieved with such a copolymerization strategy.
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Environmental Progress & Sustainable Energy
·
2013
·Vol. 33
·期 3
·814-823
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IF 0.865
Ruihua Huang,Bingchao Yang,Qian Liu,Yanping Liu
The simultaneous adsorption of phenol and Cr(VI) from aqueous solution onto this activated carbon/chitosan composite was investigated. This composite almost removes phenol and Cr(VI) simultaneously in a pH range of 2–5. The removals of phenol and Cr(VI) reached up to 95% when phenol and Cr(VI) concentrations were less than 50 mg/L and 200 mg/L, respectively. The presence of phenol reduced Cr(VI) adsorption, while the presence of Cr(VI) had no evident effect on phenol adsorption. The adsorption for both Cr(VI) and phenol followed pseudo-second-order kinetics in single or mixedsystems. © 2013 American Institute of Chemical Engineers Environ Prog, 33: 814–823, 2014
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ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Ronggang Luo,Ruiqi Li,Zhangzhi Zheng,Lianpeng Zhang,Linkun Xie,Chunhua Wu,Siqun Wang,Xijuan Chai,Nyuk Ling Ma,Mu. Naushad,Guanben Du,Kaimeng Xu
To develop a highly efficient adsorbent to remediate and remove hexavalent chromium ions (Cr(VI)) from polluted water, cellulose acetate (CA) and chitosan (CS), along with metal oxides (titanium dioxide (TiO 2 ) and ferroferric oxide (Fe 3 O 4 )), and a zirconium-based metal-organic framework (UiO-66) were used to fabricate the composite porous nanofiber membranes through electrospinning. The adsorption performance, influencing factors, adsorption kinetics and isotherms of composite nanofiber membranes were comprehensively investigated. The multi-layer membrane with interpenetrating nanofibers and surface functional groups enhanced the natural physical adsorption and provided potential chemical sites. The thermal stability was improved by introducing TiO 2 and UiO-66. CA/CS/UiO-66 exhibited the highest adsorption capacity (118.81 mg g −1 ) and removal rate (60.76%), which were twice higher than those of the control. The correlation coefficients ( R 2 ) of all the composite nanofibers regressed by the Langmuir model were significantly higher than those by the Freundlich model. The pseudo-first-order kinetic curve of CA/CS composite nanofibers showed the highest R 2 (0.973), demonstrating that the whole adsorption process involved a combination of strong physical adsorption and weak chemical adsorption by the amino groups of CS. However, the R 2 values of the pseudo-second-order kinetic model increased after incorporating TiO 2 , Fe 3 O 4 , and UiO-66 into the CA/CS composite nanofiber membranes since an enhanced chemical reaction with Cr (VI) occured during the adsorption
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yuan Zhao,Tao Chen,Tian Liang,Ya-yang Tian,Lin-feng Chen,Bing Li,Jie Gao
The excessive discharge of Cr(VI) not only causes severe environmental pollution but also poses significant ecological risks. Thus, it is an urgent human demand and scientific challenge to use renewable biomass to prepare adsorbent in an eco-friendly and efficient way, effectively remove Cr(VI) pollutants, and achieve sustainable development. Herein, loofah, a cheap, strong toughness and 3D network structure, was selected as the substrate. Glycidyl methacrylate (GMA) was grafted onto the surface of loofah via electron beam radiation. Subsequently, two aminated loofah-based adsorbents, PLGD and PLGP, were synthesized through a ring-opening reaction with diethylenetriamine (DETA) and polyethyleneimine (PEI), respectively, followed by protonation. At 318.15 K, the maximum adsorption capacities of PLGD and PLGP for Cr(VI) were determined to be 162.04 and 94.12 mg/g, respectively. The adsorption behavior of Cr(VI) by PLGD and PLGP followed the Langmuir isotherm model and pseudo-second-order (PSO) kinetic model. The pHpzc values of PLGD and PLGP were 6.5 and 9.7, respectively. The potential mechanisms for Cr(VI) removal included electrostatic interactions, ion exchange, surface functional group complexation and reduction. This study provided a strategic approach for utilizing agricultural and forestry waste to develop functional adsorbents for the efficient removal of Cr(VI), and further enhanced the application potential of low-toxicity and cost-effective biosorbents in the elimination of heavy metal pollutants.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yu Li,Zhenhua Xiong,Siying Zhang,Long Zhang,Li Sheng,Xingli Ding,Liang Shen,Jingkun Xu,Jinglan Wang,Ge Zhang
Degradable fluorescent film sensors are highly ideal for real-time outdoor detection of heavy metal ions and offer the advantage of preventing secondary contamination, aligning with the principle of sustainable development. In this work, we constructed a degradable fluorescent hydrogel for the specific detection of Cr(VI) ions, utilizing poly(1-pyrene butyric acid) (PPBA) as the sensing moiety and sodium alginate (SA) as the cross-linking substrate. The porous network structure of the PPBA-SA film provided enhanced ion transport channels and active sites, thereby reducing fluorescence response time and augmenting detection sensitivity. The PPBA-SA film exhibited rapid and selective recognition of Cr(VI) ions among a panel of 16 anions and 22 cations, achieving an impressive limit of detection of 1.99 nM. Moreover, we successfully applied this platform to detect Cr(VI) ions in four different vegetable samples. Notably, the PPBA bound with Cr(VI) ions could be effortlessly removed from the film, and the substrate underwent rapid degradation within 24 h, attaining a degradation rate of 72.4 %. This work provides an innovative and effective strategy for fabricating green and sustainable fluorescent sensors.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2024
·
IF 3.9
Liu Yuhao,Wang Xuyi,Chen Jiayue,Wang Hua,Cheng Ming,Zheng Dan,Zhang Beibo,Geng Liang,Chen Liping,Jia Yingbin,Wang Luoxin
In this work, we synthesized core-shell NH 2 -UiO-66@UiO-67 via a solvothermal method to achieve controlled assembly of amino-modified UiO-66 and UiO-67 at micro and nano scale. NH 2 -UiO-66@UiO-67 exhibited notable visible light responsiveness and an increased specific surface area.In addition, it demonstrated outstanding performance in Cr(VI) removal, which can be attributed to the photocatalytic conversion of Cr(VI) into less toxic Cr(III), and the adjustable pores and large specific surface area facilitating Cr(III) adsorption. Notably, it exhibited a robust removal efficiency across a wide pH range of 2.0 to 10.0. Specifically, at pH = 2.0, the Cr(VI) solution with a concentration of 60 mg/L was completely removed within 140 min. The results show that the adsorption of core-shell NH 2 -UiO-66@UiO-67 meets the pseudo-second-order adsorption kinetics and has the ability of photocatalytic reduction of Cr (VI).
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Xiupei Yang,Xiaofang Chen,Hanyu Yang,Yuxiu Fan,Ling Jiang,Feng Huo
With the development of electronics, electroplating, printing, and dyeing industries, environmental pollution caused by hexavalent chromium (Cr(VI)) has become increasingly prominent. Skin contact with Cr (VI) can cause allergies or genetic defects, and inhalation can cause cancer, which is a lasting danger to the environment and the human body. Developing effective strategies to monitor Cr(VI) in environmental water or industrial wastewater can evaluate the degree of water pollution and risk warning, thus helping to prevent the spread of Cr(VI) pollution, promote the protection of water resources and the ecological environment, and ensure human safety and sustainable development. On the basis of the regulation of dopamine, boron-doped zinc single-atom nanozymes (Zn/B-NC SAzymes) with three-dimensional nanoflower morphology were controlled in this work. The introduction of B in Zn/B-NC SAzymes and the high metal loading of Zn (6.5 wt%) led to the formation of more active sites, resulting in the material showing excellent enzyme-like activity. H 2 O 2 decomposed to generate superoxide radicals under the catalysis of Zn/B-NC SAzymes, which then oxidized the substrate 3,3′,5,5′-tetramethylbenzidine (TMB) to generate blue oxTMB. When Cr(VI) was introduced into the sensor system, the color of blue oxTMB is deepened, and the colorimetric method of Cr(VI) was constructed. The linear range is 0.2–40 μM, LOD is 59 nM, and the visual detection of Cr (VI) is performed with the aid of the smartphone. This work not only provides experimental and theoretical guidance for understanding the active centers of Zn-SAzymes and their catalytic processes, but also provides a promising and alternative detection strategy for the rapid and even visual on-site detection of Cr(VI) in aquatic environments, which is of great significance for the control of Cr(VI) pollution in the environment and industrial wastewater.
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