WATER RESEARCH
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2017
·
IF 6.942
Xiao-Tong Lv,Xue Zhang,Ye Du,Qian-Yuan Wu,Yun Lu,Hong-Ying Hu
Chlorinated reclaimed water is widely used for landscaping and recreational purposes, resulting in human exposure to toxic disinfection byproducts . Although the quality of chlorinated reclaimed water might be affected by sunlight during storage, the effects of solar light irradiation on the toxicity remain unknown. This study investigated the changes in cytotoxicity and total organic halogen (TOX) of chlorinated reclaimed water exposed to solar light. Irradiation with solar light for 12 h was found to significantly reduce the cytotoxicity of chlorinated reclaimed water by about 75%, with ultraviolet light being responsible for the majority of this reduction. Chlorine residual in reclaimed water tended to increase the cytotoxicity, and the synergy between solar light and free chlorine could not enhance the reduction of cytotoxicity. Adding hydroxyl radical scavengers revealed that the contribution of hydroxyl radical to cytotoxicity reduction was limited. Solar light irradiation concurrently reduced TOX. The low molecular weight (<1 kDa) fraction was the major contributor of cytotoxicity and TOX in chlorinated reclaimed water. Detoxification of the low molecular weight fraction by light irradiation was mainly a result of TOX dehalogenation, while detoxification of the high molecular weight (>1 kDa) fraction was probably caused by photoconversion from high toxic TOX to low toxic TOX.
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高影响因子
Micromachines
·
2017
·Vol. 8
·期 6
·192
·
IF 1.833
Yang Liu,Cong Wu,Hok Sum Sam Lai,Yan Ting Liu,Wen Jung Li,Ya Jing Shen
Artificial reconstruction of three-dimensional (3D) hydrogel microstructures would greatly contribute to tissue assembly in vitro, and has been widely applied in tissue engineering and drug screening. Recent technological advances in the assembly of functional hydrogel microstructures such as microfluidic, 3D bioprinting, and micromold-based 3D hydrogel fabrication methods have enabled the formation of 3D tissue constructs. However, they still lack flexibility and high efficiency, which restrict their application in 3D tissue constructs. Alternatively, we report a feasible method for the fabrication and reconstruction of customized 3D hydrogel blocks. Arbitrary hydrogel microstructures were fabricated in situ via flexible and rapid light-addressable electrodeposition. To demonstrate the versatility of this method, the higher-order assembly of 3D hydrogel blocks was investigated using a constant direct current (DC) voltage (6 V) applied between two electrodes for 20–120 s. In addition to the plane-based two-dimensional (2D) assembly, hierarchical structures—including multi-layer 3D hydrogel structures and vessel-shaped structures—could be assembled using the proposed method. Overall, we developed a platform that enables researchers to construct complex 3D hydrogel microstructures efficiently and simply, which has the potential to facilitate research on drug screening and 3D tissue constructs.Keywords:three-dimensional (3D) hydrogel assembly;TiOPc;alginate hydrogel;light-induced electrodeposition
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 28
·期 2
·1271-1280
·
IF 1.798
Wang Wenwen,Yang Dongjiang,Yang Weiyou,Sun Jin,Hou Huilin
The wide application of the titanium dioxide (TiO 2 ) as the photocatalysts is greatly hindered by its intrinsic large band gap and usually fast electron–hole recombination. Here, we reported the exploration of coupling g-C 3 N 4 nanoflakes to TiO 2 nanotubes with the anatase and TiO 2 (B) mixed phases (TiO 2 (AB)) toward the efficient visible-light-driven hybrid photocatalyst. It is found that coupling TiO 2 (AB) nanotubes with g-C 3 N 4 nanoflakes could bring a profoundly extension the visible light adsorption capacity and enhanced photogenerated carrier separation. Accordingly, they exhibit much higher efficient photocatalytic activities toward the degradation of sulforhodamine B under the visible light irradiation, which is enhanced for nearly 15 times to those of the TiO 2 (AB) and g-C 3 N 4 , suggesting their promising practical applications as novel and efficient semiconductor photocatalysts for the water purification.
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JOURNAL OF CATALYSIS
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2017
·
IF 6.844
Yan Cao,Zipeng Xing,Mengqiao Hu,Zhenzi Li,Xiaoyan Wu,Tianyu Zhao,Ziyuan Xiu,Shilin Yang,Wei Zhou
Mesoporous black N-TiO 2−x hollow spheres are successfully fabricated through a facile evaporation-induced self-assembly (EISA) process, coupled with an etching procedure and an in-situ solid-state chemical reduction strategy. The resultant black N-TiO 2−x hollow spheres with high crystallinity possess a narrow band gap of ∼2.37 eV, a large specific surface area of ∼128 m 2 g −1 , and a well defined hollow sphere structure, which exhibit excellent visible-light-driven photocatalytic performance for degradation of phenol , reduction of Cr(IV), and hydrogen production . The photocatalytic reaction apparent rate constants (k) of the black N-TiO 2−x for phenol degradation and Cr(IV) reduction are ∼5 and 6 times higher than that of pristine TiO 2 , and hydrogen production rate for N-TiO 2−x is ∼160 μmol h −1 , which is ∼7 folds higher than that of pristine one. The excellent photocatalytic and photoreduction property can be attributed to the synergy effect of N and Ti 3+ codoping narrowing the band gap, the high specific surface area offering more surface active sites, and the mesoporous hollow structure favoring light harvesting and refraction.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Shouqiang Huang,Zhichun Li,Bo Wang,Nanwen Zhu,Congyang Zhang,Long Kong,Qi Zhang,Aidang Shan,Liang Li
Under illumination of light-emitting diode (LED) or sunlight, the green color of all-inorganic CsPbBr3 perovskite nanocrystals (CPB-NCs) often quickly changes to yellow, followed by large photoluminescence (PL) loss. To figure out what is happening on CPB-NCs during the color change process, the morphology, structure, and PL evolutions are systematically investigated by varying the influence factors of illumination, moisture, oxygen, and temperature. We find that the yellow color is mainly originated from the large CPB crystals formed in the illumination process. With maximized isolation of oxygen for the sandwiched film or the uncovered film stored in nitrogen, the color change can be dramatically slowed down whether there is water vapor or not. Under dark condition, the PL emissions are not significantly influenced by the varied relative humidity (RH) levels and temperatures up to 60 °C. Under the precondition of oxygen or air, color change and PL loss become more obvious when increasing the illumination power or RH level, and the large-sized cubic CPB crystals are further evolved into the oval-shaped crystals. We confirm that oxygen is the crucial factor to drive the color change, which has the strong synergistic effect with the illumination and moisture for the degradation of the CPB film. Meanwhile, the surface decomposition and the increased charge trap states occurred in the formed large CPB crystals play important roles for the PL loss.
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JOURNAL OF HAZARDOUS MATERIALS
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2017
·
IF 6.065
Yaowen Gao,Yixi Li,Linyu Yao,Simiao Li,Jin Liu,Hui Zhang
Catalysts are known to activate peroxides to generate active radicals (i.e., hydroxyl radical ( OH) and sulfate radical (SO 4 − )) under certain conditions, but the activation of peroxides in the absence of catalysts under visible light irradiation has been rarely reported. This work demonstrates a catalyst-free activation of peroxides for the generation of OH and/or SO 4 − through photoexcited electron transfer from organic dyes to peroxides under visible LED light irradiation, where Rhodamine B (RhB) and Eosin Y (EY) were selected as model dyes. The formation of OH and/or SO 4 − in the reactions and the electron transfer from the excited dyes to peroxides were validated via electron paramagnetic resonance (EPR), photoluminescence (PL) spectra and cyclic voltammetry (CV). The performance of the peroxide/dye/Vis process was demonstrated to be altered depending on the target substrate. Meanwhile, the peroxide/dye/Vis process was effective for simultaneous decolorization of dyes and production of active radicals under neutral even or basic conditions. The findings of this study clarified a novel photoexcitation pathway for catalyst-free activation of peroxides under visible light irradiation, which could avoid the secondary metal ion (dissolved or leached) pollution from the metal-based catalysts and expand the application range of the peroxide-based catalytic process.
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CHEMICAL PAPERS
·
2017
·Vol. 69
·期 11
·1411-1420
·
IF 1.258
Ding Ming-Yue,Meng De-Shui,Tang Yan-Hong,Liu Cheng-Bin,Luo Sheng-Lian
One-dimensional (1D) Ag/AgBr/TiO 2 nanofibres (NFs) have been successfully fabricated by the one-pot electrospinning method. In comparison with bare TiO 2 NFs and Ag/AgBr/PVP (polyvinylpyrrolidone) NFs, the 1D Ag/AgBr/TiO 2 NFs photocatalyst exhibits much higher photocatalytic activity in the degradation of a commonly used dye, methylene blue (MB), under visible light. The photocatalytic removal efficiency of MB over Ag/AgBr/TiO 2 NFs achieves almost 100 % in 20 min. The photocatalytic reaction follows the first-order kinetics and the rate constant ( k ) for the degradation of MB by Ag/AgBr/TiO 2 NFs is 5.2 times and 6.6 times that of Ag/AgBr/PVP NFs and TiO 2 NFs, respectively. The enhanced photocatalytic activity is ascribed to the stronger visible light absorption, more effective separation of photogenerated electron-hole pairs, and faster charge transfer in the long nanofibrous structure. The Ag/AgBr/TiO 2 NFs maintain a highly stable photocatalytic activity due to its good structural stability and the self-stability system of Ag/AgBr. The mechanisms for photocatalysis associated with Ag/AgBr/TiO 2 NFs are proposed. The degradation of MB in the presence of scavengers reveals that h + and • O
− 2
significantly contribute to the degradation of MB.
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OPTICAL MATERIALS
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2017
·
IF 2.238
Yuxian Xu,Yongjin Luo,Qingrong Qian,Baoquan Huang,Qinghua Chen
Visible-light-induced BiOCl/Bi/P25 composite materials were prepared via a hydrothermal method , and evaluated by degradation of methyl orange (MO) aqueous solution. It exhibits the highest photocatalytic efficiency, which is 53.6 and 23.9 times higher than that of Bi/BiOCl and P25, respectively. The superior activity is attributed to the surface plasmon resonance (SPR) of metallic Bi , and the efficient separation of the photogenerated carriers with the aid of BiOCl/P25 heterostructure . In the photodegradation process, holes (h vb + ) can react with Cl − ions to form Cl radicals, both of which can oxidize MO. Then Cl radicals reduce to Cl − again, forming a circulation and improving the photocatalytic activity .
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Nanoscale
·
2017
·Vol. 9
·期 27
·9404-9410
·
IF 7.367
Lingling Zhang,He Zhang,Xiaowei Zhang,Yujie Han,Hui Zhang,Yiwen Zhai,Shaojun Dong
The insatiable energy demand asks for the maximum conversion of green renewable sources. Herein, we propose the first NIR-assisted glucose/air bio–photoelectrochemical (BPEC) cell comprising a rare earth up-conversion microcrystal (UCMC)-based polyterthiophene (pTTh) cathode. Upon irradiation with a 980 nm laser, UCMCs emit robust luminescence in the visible range, which can efficiently excite pTTh, catalyzing the reduction of oxygen and generating photocurrent. Coupling with a glucose oxidation bioanode, this assembled BPEC cell exhibits a maximal output power density of 40.6 μW cm−2 and an open circuit voltage of 0.53 V. This success is an essential conceptual steppingstone towards the comprehensive utilization of whole sunlight and offers alternative solutions for multiple energy conversions.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 4
·3796-3805
·
IF 1.798
Hou Huilin,Gao Fengmei,Shang Minghui,Wang Lin,Zheng Jinju,liu Qiao,Yang Zuobao,Xu Jiahuan,Yang Weiyou
Improving the photocatalytic efficiency of TiO 2 semiconductor is crucially important and highly desired for its practical applications. In the present work, aiming to broaden the photoresponse window and limit the photocatalyst aggregation, we reported the exploration of N-doped TiO 2 thoroughly mesoporous nanofibers with high purity in morphology via a foaming-assisted electrospinning strategy. The foaming agents and urea were introduced in the raw materials to create the mesopores and incorporate the N dopants into the conventional solid TiO 2 nanofibers, respectively, which could be accomplished simultaneously over one-step calcination process. The synergetic combination of N dopants and one-dimensional mesoporous nanostructure allow the TiO 2 fibers to exhibit significantly enhanced visible-light photocatalytic activity toward the Rhodamine B and hydrogen evolution, as compared to those of N-doped solid and intrinsic thoroughly mesoporous counterparts, suggesting their promising applications in water purification and energy supply.
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JOURNAL OF PLANT GROWTH REGULATION
·
2024
·
IF 3.9
Luo Liping,Zhang Gaowei,Liang Wenjing,Wu Dong,Sun Qifang,Hao Yingbin
Broccoli microgreens represent a novel type of vegetable characterized by high levels of bioactive compounds. Here, we investigated the effects of light-emitting diode (LED) light quality on the development and nutritional uptake of broccoli microgreens. The plants were exposed to five distinct light treatments: white, single red, and red: blue at 5:1, 5:3, and 5:5 ratios. The soluble sugars, nutrients, and secondary metabolites of broccoli sprout extracts were examined using high-performance liquid chromatography and ultra-high-performance liquid chromatography quadrupole time-of-flight mass spectrometry under various light-quality conditions. In addition, the expression levels of genes encoding important enzymes in the glucosinolates (GLs) biosynthesis pathway were examined using quantitative real-time polymerase chain reaction. Overall, the findings demonstrated that mixed red-blue light, especially the 5:1 red: blue ratio, was beneficial for broccoli microgreens in terms of their hypocotyl length, fresh weight, edible rate, soluble proteins, vitamin C, total phenolics, total flavonoids, and GLs. Our findings provide a foundation and reference point for selecting the most appropriate LED light ratio in microgreens production.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yanan Liu,Han Zhang,Dahai Zhu,Jinping Duan,Andere Clement Miruka,Li Tang,Pan Li,Li Cai
Photocatalysis and peroxydisulfate (PS) based advanced oxidation techniques are promising technologies in the field of water treatment that can be used to destroy increasingly persistent organic contaminants. The current work used a simple hydrothermal approach to synthesize a catalyst made of composites of TiO 2 nanospheres and multi-layer Ti 3 C 2 T x sheets (TiO 2 @MXene). Tetracycline (TC) was then effectively degraded by the TiO 2 @MXene material integrated with PS activation (300 mg/L). Under simulated sunlight (AM 1.5G, P = 2.8 W) irradiation, the combination method dramatically increases TC degradation. Following a 30-min treatment with 300 mg/L TiO 2 @MXene (wt.10 %), the optimal efficiency can reach 100 %. As the reactive functional species, holes (h + ), SO 4 - •, •OH, and •O 2 − dominate the catalytic process. Furthermore, investigation was conducted into significant factors such as catalyst dosage, PS dosage, common anions, and TiO 2 loading dosage. The TiO 2 @MXene material was demonstrated to be a feasible and sustainable strategy worth taking into consideration in the mitigation of emerging water contaminants due to its ease of recovery, stability of surface properties, and recyclability. Furthermore, the proposed degradation mechanism further demonstrated the viability of TiO 2 @MXene with PS in TC degradation. This, this study provides insights into the design of effective photocatalyst coupling PS activation for the efficient degradation of organic pollutants.
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