INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
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
·
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
·
2017
·
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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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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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 9
·3954-3966
·
IF 9.931
Zhikai Yu,Xingmin Gao,Yan Yao,Xiangcheng Zhang,Guo-Qing Bian,Winston Duo Wu,Xiao Dong Chen,Wei Li,Cordelia Selomulya,Zhangxiong Wu,Dongyuan Zhao
Aerosol-assisted methods possess a strong capability for synthesis of titania (TiO2) microspheres. For dynamic separation applications, rough TiO2 microspheres with uniform large micron sizes, high external-surface-area-to-volume ratios, high surface areas, uniform mesopores and abundant hydroxyl groups are desirable. Herein, we demonstrate the combination of evaporation induced self-assembly (EISA) with a microfluidic-jet spray drying process for scalable synthesis of novel mesoporous TiO2 materials with the above-mentioned properties for Cr(VI) removal under both static and dynamic conditions. The TiO2 materials are spherical with uniform large micron sizes (∼45 μm). They possess wrinkled surfaces and thus have high particle external-surface-area-to-volume ratios. They show high surface areas (22–138 m2 g−1), large pore volumes (0.15–0.27 cm3 g−1) and uniform mesopores (5.2–20.7 nm). They carry abundant surface Ti–OH groups due to the presence of oxygen vacancies and the Ti3+ valence state. Several experimental parameters, such as drying and calcination temperatures, are varied, leading to TiO2 samples with tunable surface areas and mesopore sizes. They can be adopted as batch sorbents for removal of Cr(VI) in water with fast adsorption rates, large capacities and pH-dependent adsorption behavior. Part of the adsorbed Cr(VI) can be reduced to Cr(III) in acidic solutions. The influences of adsorbent properties on adsorption performance are elucidated. Moreover, their uniform large micron sizes make them excellent fillers for efficient separation of Cr(VI) in dynamic flows with similar performance to that under static conditions, as well as easy regeneration and high cycling stability. Their adsorption performance under flowing conditions is much better than those of commercial TiO2 nanoparticles and mesoporous TiO2 materials prepared by a conventional EISA method, which make them very attractive for practical dynamic separation applications.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 6
·4078-4088
·
IF 2.599
Su Yiping,Cui Mingfang,Zhu Jianhua,Wu Yayu,Wei Yaping,Bian Shicong
A feasible strategy is demonstrated here for low-cost and rapid synthesis of nanosheet-structured BaCO 3 spheres (NSBCs) on a large scale. Experiments reveal that NSBCs were developed from amorphous precursor under the mediation of phosphate. Their nanosheet-composed structures facilitate the rapid removal of contaminant of Cr(VI) within 60 min from aqueous solution, showing an excellent adsorption capacity ( q
m,cal = 227 mg/g, T = 298 K). The kinetic and isotherm processes confirmed well to the pseudo-second-order model and Langmuir adsorption model, respectively. Thermodynamic analysis indicated that the adsorption process was spontaneous and endothermic. NSBCs show better Cr(VI) removal behaviour compared with commercial and some synthetic barium carbonate, which may have potential application in water treatment.
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MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Hua Liu,Zumin Wang,Haiyan Li,Hao Wang,Ranbo Yu
Industrial wastewater containing both organic and inorganic pollutants is being generated all the time. Efficient materials are highly needed to purify the polluted water. Thus, a hierarchical structured α-Fe 2 O 3 with excellent adsorptive property has been synthesized by using a facile hydrothermal method. It can be prepared in macroscopic quantity. The as-synthesized α-Fe 2 O 3 with silkworm cocoon-like morphology shows high efficiency in adsorbing Congo red (CR), Methyl orange (MO) and Cr(VI). The removal efficiency of CR, MO and Cr(VI) can reach 99.2%, 83.9% and 100% under appropriate conditions. Besides, this α-Fe 2 O 3 shows high adsorptive ability for mixed CR and Cr(VI) in aqueous solution and the final removal rates can reach 94.7% and 97.9%, respectively. The adsorption kinetics fits well with the pseudo-second-order kinetic model. The results indicate that the product may find potential application in purification of wastewater containing both organic and inorganic 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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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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MOLECULES
·
2024
·Vol. 29
·期 7
·1560
·
IF 4.2
Yi Fang,Lang Yang,Feng Rao,Kaiming Zhang,Zhuolin Qin,Zhenguo Song,Zhihui Na
Geopolymers show great potential in complex wastewater treatment to improve water quality. In this work, general geopolymers, porous geopolymers and geopolymer microspheres were prepared by the suspension curing method using three solid waste products, coal gangue, fly ash and blast furnace slag. The microstructure, morphology and surface functional groups of the geopolymers were studied by SEM, XRD, XRF, MIP, FTIR and XPS. It was found that the geopolymers possess good adsorption capacities for both organic and inorganic pollutants. With methylene blue and potassium dichromate as the representative pollutants, in order to obtain the best removal rate, the effects of the adsorbent type, dosage of adsorbent, concentration of methylene blue and potassium dichromate and pH on the adsorption process were studied in detail. The results showed that the adsorption efficiency of the geopolymers for methylene blue and potassium dichromate was in the order of general geopolymers < porous geopolymers < geopolymer microspheres, and the removal rates were up to 94.56% and 79.46%, respectively. Additionally, the competitive adsorption of methylene blue and potassium dichromate in a binary system was also studied. The mechanism study showed that the adsorption of methylene blue was mainly through pore diffusion, hydrogen bond formation and electrostatic adsorption, and the adsorption of potassium dichromate was mainly through pore diffusion and redox reaction. These findings demonstrate the potential of geopolymer microspheres in adsorbing organic and inorganic pollutants, and, through five cycles of experiments, it is demonstrated that MGP exhibits excellent recyclability.
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