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1

Bamberger, Carlos E., George M. Begun, and C. Sue MacDougall. "Raman Spectroscopy of Potassium Titanates: Their Synthesis, Hydrolytic Reactions, and Thermal Stability." Applied Spectroscopy 44, no. 1 (January 1990): 30–37. http://dx.doi.org/10.1366/0003702904085732.

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The majority of the potassium titanates described in the literature were synthesized, and their Raman spectra recorded. The identity of the compounds K2TiO3, K2Ti2O5, K2Ti4O9, K2Ti6O13, and K2Ti8O17 was confirmed by x-ray diffraction. Raman spectroscopy was then used to study the hydrolysis, under different conditions, of K2Ti2O5 and of K2Ti4O9. On drying of the hydrolysis products, the following species were found to form: K2(H2O)0.66 Ti8O16(OH)2, K1.33(H2O)0.33Ti4O8.33(OH)0.67, and H2Ti8O17. On ignition at temperatures of 500–600°C these species converted, respectively, to K2Ti8O17, K2Ti6O13, and TiO2(B). Raman spectroscopy was used to establish that (1) K6Ti4O11 consists of a mixture of K2TiO3 and a new compound K4Ti3O8; (2) K2Ti3O7 consists of a mixture of K2Ti2O5 and K2Ti4O9, and (3) K2Ti5O11 consists of a mixture of K2Ti4O9 and K2Ti6O13. The temperature of decomposition and the identity of the products of the thermal decomposition of K2Ti8Ol7, K2Ti4O9, K2Ti2O5, and K4Ti3O8 were determined by Raman spectroscopy. The XRD data of the newly identified compounds are reported.
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2

Liu, Chang, Xi Feng Qin, Zhu Hong Yang, Xin Feng, and Xiao Hua Lu. "Control of Surface Morphologies and Crystal Structures of Potassium Titanate Fibers by Flux Method." Key Engineering Materials 334-335 (March 2007): 201–4. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.201.

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In this work, flux method is used to control the surface morphologies and crystal structures of the fine K2Ti6O13 fibers. When K2CO3 as a flux is added into fine K2Ti6O13 fibers and heated at 1100oC for 2h, the crystal of fibers are transformed to K2Ti4O9 and K2Ti2O5, however, the resulting fibers have no significant change in morphologies. On the other hand, when KCl is used as flux (15wt%) and heated at 1200oC for 2h, the diameters of the resulting fibers become about 2 micron without any change of the crystal structure.
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3

Zhang, Na, Hai Fang Xu, Yu Lin Li, Qiang Li, and Cheng Zhang. "Novel Phase Transformation Phenomenon of Potassium Teteratitanate Nanofibres Synthesized from H2TiO3." Advanced Materials Research 177 (December 2010): 62–65. http://dx.doi.org/10.4028/www.scientific.net/amr.177.62.

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Starting from H2TiO3, potassium teteratitanate (K2Ti4O9) nanofibres with the length of several micrometers and the diameter of 100nm were directly synthesized by solid state reaction. The novel phase transformation and structure change behavior was investigated by the X-ray diffraction technique (XRD), scanning electron microscopy (SEM) in details. In series of hydrothermal reaction, the K2Ti4O9 could transfer to anatase TiO2 and rutile TiO2. Aggregated anatase TiO2 particles and rod-like rutile TiO2 were produced respectively in 1M HCl solutions at 1600C and 2200C. When the 0.01M HCl solution was considered as solvent, the mixture of floral anatase TiO2 and K2Ti4O9 were present together.
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4

Zhou, Xuesong, Jing Fan, Xiaoli Wei, Yi Shen, and Yanzhi Meng. "Study on the Growth Mechanism of K2Ti4O9 Crystal." High Temperature Materials and Processes 37, no. 5 (April 25, 2018): 405–10. http://dx.doi.org/10.1515/htmp-2016-0168.

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AbstractPotassium hexatitanate (K2Ti4O9) whiskers were prepared by the kneading–drying–calcination method. After the preparation of products under different calcination temperatures and holding times, their morphology and structure were characterized by thermogravimetric and differential thermal, X-ray diffraction (XRD), scanning electron microscopy and transmission electron microscopy. The XRD analysis showed that the reaction mixture was completely converted to K2Ti4O9 crystals at 800 °C when the T/K ratio was 3. Based on the analysis of LS (liquid–solid) growth mechanism, the corresponding transformation reaction mechanism during the roasting was elucidated. K2Ti4O9 whiskers grow mainly through the parallel action at a low temperature. With the increase in temperature, the series effect is obvious.
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5

Yoshimura, H. N., André Luiz Molisani, Cátia Fredericci, K. S. de Oliveira, A. C. L. Weber, and A. L. M. Martins. "Synthesis of Potassium Titanate Fibers for Friction Materials." Materials Science Forum 591-593 (August 2008): 755–59. http://dx.doi.org/10.4028/www.scientific.net/msf.591-593.755.

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Potassium hexa and octatitanate fibers have been proposed as reinforcement for friction materials. The aim of this work was to establish a calcination route to produce these fibers, using commercial anatase and potassium carbonate powders. These powders were dry mixed with TiO2/K2O molar ratio, n, of 3.0, 3.5, and 4.0, and then calcined at 950, 1050, and 1150°C for 3 h. Calcined powders were milled, washed in warm water with different pHs, and heat treated to crystallize the fibers. The best conditions to growth long fibers were n=3.0 and 1050°C, in the twofase field (liquid + K2Ti4O9). Controlled ion-exchange with water removed K+ ions from K2Ti4O9 fibers resulting in potassium hexa or octatitanate fibers after the second heat-treatment. Fibers with sub-micrometer thickness (~0.6 μm) and average length of ~20 μm could be prepared.
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6

Cui, Wen Quan, Shuang Long Lin, Shan Shan Ma, Li Liu, and Ying Hua Liang. "Photocatalytic Activity of Ag2S/K2Ti4O9 for Rhodamine B Degradation under Visible Light Illumination." Advanced Materials Research 668 (March 2013): 29–32. http://dx.doi.org/10.4028/www.scientific.net/amr.668.29.

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The composite Ag2S/K2Ti4O9 photocatalyst was synthesized via a precipitation method. The structure of the photocatalyst was determined by powder X-ray diffraction, scanning electron microscope. The photocatalytic properties for organic matter degradation of the photocatalyst were examined under visible light irradiation. The results showed that, the sample which synthesized at 25°C via a precipitation route,using nitric acid silver and thiourea as the raw materials in the absence of any surfactants or templates has the highest crystallinity and investigated its catalytic behavior. RhB as degradation object, different dosing quantity of the degradation rate were examined, The best dosing quantity (1000 MgL-1) degradation rate was 18.93%. And with K2Ti4O9 for ontology, the degradation of different load rate were examined, The best load (25%) of the degradation rate is 20.57%. The results revealed the Ag2S potential applications in photocatalytic degradation for organic pollutants.
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7

Zhang, S., J. Wu, X. L. Ji, F. Yi, and P. F. Hu. "Preparation of K2Ti4O9 nanowhiskers via stearic acid method." Materials Research Innovations 19, sup10 (December 14, 2015): S10–340—S10–344. http://dx.doi.org/10.1179/1432891715z.0000000002190.

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8

Kishore, Brij, Venkatesh G, and N. Munichandraiah. "K2Ti4O9: A Promising Anode Material for Potassium Ion Batteries." Journal of The Electrochemical Society 163, no. 13 (2016): A2551—A2554. http://dx.doi.org/10.1149/2.0421613jes.

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9

Kikkawa, S., F. Yasuda, and M. Koizumi. "Ionic conductivities of Na2Ti3O7, K2Ti4O9 and their related materials." Materials Research Bulletin 20, no. 10 (October 1985): 1221–27. http://dx.doi.org/10.1016/0025-5408(85)90096-0.

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10

Tournoux, M., R. Marchand, and L. Brohan. "Layered K2Ti4O9 and the open metastable TiO2(B) structure." Progress in Solid State Chemistry 17, no. 1 (January 1986): 33–52. http://dx.doi.org/10.1016/0079-6786(86)90003-8.

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11

Li, Sunfeng, Xing Wang, Qi Chen, Qinqin He, Mengmeng Lv, Xueting Liu, Jianping Lv, and Fengyu Wei. "Synthesis and photocatalytic activity of N-K2Ti4O9/UiO-66 composites." RSC Advances 5, no. 66 (2015): 53198–206. http://dx.doi.org/10.1039/c5ra05477j.

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N-K2Ti4O9/UiO-66 composites synthesized by a facile solvothermal method possess a hierarchical core–shell structure with UiO-66 forming the shell around the N-K2Ti4O9 core.
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12

Tandon, Shripal R. P., and S. D. Pandey. "Electrical conductivity and epr investigations in iron doped polycrystalline K2Ti4O9." Journal of Physics and Chemistry of Solids 52, no. 9 (January 1991): 1101–7. http://dx.doi.org/10.1016/0022-3697(91)90043-y.

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13

Deng, Zhao, Ying Dai, Hai Rui Liu, and Wen Chen. "Large Scale Synthesis of BaTiO3 Nanorods by a Template Way." Advanced Materials Research 79-82 (August 2009): 373–76. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.373.

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Large scale BaTiO3 nanorods were successfully synthesized by a template method based on a precipitation process. The templates used in our method are H2Ti8O17 nanorods, which can be synthesized from K2Ti4O9 fibers. The unique process of the synthesis is BaC2O4•0.5H2O shell was coated on the 1-dimensional H2Ti8O17 nanorods (the core). The as-prepared products were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the BaTiO3 nanorods are ~100-300 nm in diameter and ~2-10 m in length. The process described provides a general route to fabricate this kind of perovskite 1-dimensional nanostructures, such as SrTiO3 and PbTiO3.
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14

Tan, Shali, Yujun Zhang, and Hongyu Gong. "Investigation on K2Ti4O9 Whisker Absorbent and Applications in Heavy Metal Ions Removal." Journal of Water and Environment Technology 5, no. 1 (2007): 13–18. http://dx.doi.org/10.2965/jwet.2007.13.

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15

Lin, Shuanglong, Li Liu, Jinshan Hu, Yinghua Liang, and Wenquan Cui. "Photocatalytic activity of Ag@AgI sensitized K2Ti4O9 nanoparticles under visible light irradiation." Journal of Molecular Structure 1081 (February 2015): 260–67. http://dx.doi.org/10.1016/j.molstruc.2014.10.050.

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16

Wu, Jinlei, Po Lu, Jianxun Dai, Chuantao Zheng, Tong Zhang, William W. Yu, and Yu Zhang. "High performance humidity sensing property of Ti3C2Tx MXene-derived Ti3C2Tx/K2Ti4O9 composites." Sensors and Actuators B: Chemical 326 (January 2021): 128969. http://dx.doi.org/10.1016/j.snb.2020.128969.

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17

Cui, Wenquan, Shanshan Ma, Li Liu, Jinshan Hu, and Yinghua Liang. "CdS-sensitized K2Ti4O9 composite for photocatalytic hydrogen evolution under visible light irradiation." Journal of Molecular Catalysis A: Chemical 359 (July 2012): 35–41. http://dx.doi.org/10.1016/j.molcata.2012.03.018.

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18

Lee, Tae hun, Choon-Ki Na, and Hyunju Park. "Adsorption characteristics of strontium onto K2Ti4O9 and PP-g-AA nonwoven fabric." Environmental Engineering Research 23, no. 3 (March 23, 2018): 330–38. http://dx.doi.org/10.4491/eer.2018.032.

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19

MISHRA, S. A. K., S. D. PANDEY, and R. P. TANDON. "ChemInform Abstract: Electrical Conductivity and EPR Investigations in Manganese Doped Polycrystalline K2Ti4O9." ChemInform 23, no. 28 (August 21, 2010): no. http://dx.doi.org/10.1002/chin.199228014.

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20

Chigrin, P. G., E. A. Kirichenko, V. S. Rudnev, I. V. Lukiyanchuk, and T. P. Yarovaya. "Catalytic Properties of K2Ti2O5 + K2Ti4O9/TiO2/TiO2 + SiO2/Ti Composites and Their Resistance to Environment Effects during the Process of Carbon Black Oxidation." Protection of Metals and Physical Chemistry of Surfaces 55, no. 1 (January 2019): 109–14. http://dx.doi.org/10.1134/s2070205119010088.

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21

Wallenberg, L. Reine, Mehri Sanati, and Arne Andersson. "On the transformation mechanism of K2Ti4O9 to TiO2(B) and formation of microvoids." Microscopy Microanalysis Microstructures 1, no. 5-6 (1990): 357–64. http://dx.doi.org/10.1051/mmm:0199000105-6035700.

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22

Shripal, S. Badhwar, Deepam Maurya, and Jitendra Kumar. "Dielectric and a.c. conductivity studies in pure and manganese doped layered K2Ti4O9 ceramics." Journal of Materials Science: Materials in Electronics 16, no. 8 (August 2005): 495–500. http://dx.doi.org/10.1007/s10854-005-2723-4.

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23

SAKURAI, Yoshihito, and Tetsuro YOSHIDA. "Synthesis of K2Ti4O9 by the Hydrolysis of KOH-Ti(iso-C3H7O)4 Ethanol Solution." Journal of the Ceramic Society of Japan 99, no. 1146 (1991): 105–7. http://dx.doi.org/10.2109/jcersj.99.105.

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24

Ma, Zenghui, Qingning Li, Hao Pang, Zhaozhe Yu, and Dongliang Yan. "Ti3C2Tx@K2Ti4O9 composite materials by controlled oxidation and alkalization strategy for potassium ion batteries." Ceramics International 48, no. 11 (June 2022): 16418–24. http://dx.doi.org/10.1016/j.ceramint.2022.02.193.

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25

Xiaoli, Ji, Wu Shijiang, Shen Jie, and Zhao Xiujian. "Sol-Gel Process Synthesis and Visible-Light Photocatalytic Degradation Performance of Ag Doped K2Ti4O9." Integrated Ferroelectrics 161, no. 1 (March 24, 2015): 62–69. http://dx.doi.org/10.1080/10584587.2015.1035607.

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26

SAKURAI, Yoshihito, and Tetsuro YOSHIDA. "The synthesis of K2Ti4O9 by the hydrolysis of mixed metal alkoxides in ethanolic solutions." NIPPON KAGAKU KAISHI, no. 1 (1989): 33–38. http://dx.doi.org/10.1246/nikkashi.1989.33.

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27

Cao, Yang, Kongjun Zhu, Qingliu Wu, Qilin Gu, and Jinhao Qiu. "Hydrothermally synthesized barium titanate nanostructures from K2Ti4O9 precursors: Morphology evolution and its growth mechanism." Materials Research Bulletin 57 (September 2014): 162–69. http://dx.doi.org/10.1016/j.materresbull.2014.05.043.

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28

Xu, Yanli, Qi Chen, Hanbiao Yang, Mengmeng Lv, Qinqin He, Xueting Liu, and Fengyu Wei. "Enhanced photodegradation of Rhodamine B under visible light by N-K2Ti4O9/MIL-101 composite." Materials Science in Semiconductor Processing 36 (August 2015): 115–23. http://dx.doi.org/10.1016/j.mssp.2015.03.025.

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29

Cui, Wenquan, Shanshan Ma, Li Liu, Jinshan Hu, Yinghua Liang, and Joanne Gamage McEvoy. "Photocatalytic activity of Cd1−xZnxS/K2Ti4O9 for Rhodamine B degradation under visible light irradiation." Applied Surface Science 271 (April 2013): 171–81. http://dx.doi.org/10.1016/j.apsusc.2013.01.156.

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30

Wu, Dan, Huanbo Wang, Hong Huang, Rong Zhang, Lei Ji, Hongyu Chen, Yonglan Luo, et al. "Ambient electrochemical N2 reduction to NH3 under alkaline conditions enabled by a layered K2Ti4O9 nanobelt." Chemical Communications 55, no. 52 (2019): 7546–49. http://dx.doi.org/10.1039/c9cc02409c.

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A K2Ti4O9 nanobelt effectively electrocatalyzes ambient N2-to-NH3 fixation. In 0.1 M KOH, a NH3 yield of 22.88 μg h−1 mg−1cat. and a faradaic efficiency of 5.87% are attained, with good selectivity and high electrochemical stability.
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31

Shao, Cong, Sheng Feng, Guiliang Zhu, Wei Zheng, Jiajia Sun, Xianglin Huang, and Ziqiu Ni. "Synergistic effects in N-K2Ti4O9/ZIF-8 composite and its photocatalysis degradation of Bisphenol A." Materials Letters 268 (June 2020): 127334. http://dx.doi.org/10.1016/j.matlet.2020.127334.

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32

Cao, Minglei, Wei Chen, Yanan Ma, Haiming Huang, Shijun Luo, and Chuankun Zhang. "Cross-linked K2Ti4O9 nanoribbon arrays with superior rate capability and cyclability for lithium-ion batteries." Materials Letters 279 (November 2020): 128495. http://dx.doi.org/10.1016/j.matlet.2020.128495.

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33

Liang, Yinghua, Shuanglong Lin, Jinshan Hu, Li Liu, Joanne Gamage McEvoy, and Wenquan Cui. "Facile hydrothermal synthesis of nanocomposite Ag@AgCl/K2Ti4O9 and photocatalytic degradation under visible light irradiation." Journal of Molecular Catalysis A: Chemical 383-384 (March 2014): 231–38. http://dx.doi.org/10.1016/j.molcata.2013.12.014.

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34

Liang, Yinghua, Shuanglong Lin, Li Liu, Jinshan Hu, and Wenquan Cui. "Synthesis and photocatalytic performance of an efficient Ag@AgBr/K2Ti4O9 composite photocatalyst under visible light." Materials Research Bulletin 56 (August 2014): 25–33. http://dx.doi.org/10.1016/j.materresbull.2014.04.043.

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35

Cui, Wenquan, Shanshan Ma, Li Liu, and Yinghua Liang. "PbS-sensitized K2Ti4O9 composite: Preparation and photocatalytic properties for hydrogen evolution under visible light irradiation." Chemical Engineering Journal 204-206 (September 2012): 1–7. http://dx.doi.org/10.1016/j.cej.2012.07.075.

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36

Li, Sunfeng, Xing Wang, Qinqin He, Qi Chen, Yanli Xu, Hanbiao Yang, Mengmeng Lü, Fengyu Wei, and Xueting Liu. "Synergistic effects in N-K2Ti4O9/UiO-66-NH2 composites and their photocatalysis degradation of cationic dyes." Chinese Journal of Catalysis 37, no. 3 (March 2016): 367–77. http://dx.doi.org/10.1016/s1872-2067(15)61033-6.

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37

Melo, Mauricio A., Saulo A. Carminati, Jefferson Bettini, and Ana F. Nogueira. "Pillaring and NiOx co-catalyst loading as alternatives for the photoactivity enhancement of K2Ti4O9 towards water splitting." Sustainable Energy & Fuels 2, no. 5 (2018): 958–67. http://dx.doi.org/10.1039/c7se00589j.

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38

Lin, Shuanglong, Li Liu, Jinshan Hu, Weijia An, Yinghua Liang, and Wenquan Cui. "An oil-in-water self-assembly synthesis, characterization and photocatalytic properties of nano Ag@AgBr sensitized K2Ti4O9." Materials Science in Semiconductor Processing 39 (November 2015): 339–47. http://dx.doi.org/10.1016/j.mssp.2015.05.024.

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39

Bai, Mingwu, Qunji Xue, Weimin Liu, and Shengrong Yang. "Wear mechanisms of K2Ti4O9 whiskers reinforced Al20Si aluminum matrix composites with lubrication of water and tetradecane." Wear 199, no. 2 (November 1996): 222–27. http://dx.doi.org/10.1016/0043-1648(96)06960-8.

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40

Liu, Chang, Nanhua Wu, Jun Wang, Liangliang Huang, and Xiaohua Lu. "Determination of the ion exchange process of K2Ti4O9 fibers at constant pH and modeling with statistical rate theory." RSC Advances 5, no. 90 (2015): 73474–80. http://dx.doi.org/10.1039/c5ra11882d.

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The ion exchange kinetics of K2Ti4O9 fibers at constant pH was determined precisely by ion-selective electrodes, and activity coefficients of ions in solutions were calculated by the Lu–Maurer equation.
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41

Ide, Yusuke, Wataru Shirae, Toshiaki Takei, Durai Mani, and Joel Henzie. "Merging Cation Exchange and Photocatalytic Charge Separation Efficiency in an Anatase/K2Ti4O9 Nanobelt Heterostructure for Metal Ions Fixation." Inorganic Chemistry 57, no. 10 (May 3, 2018): 6045–50. http://dx.doi.org/10.1021/acs.inorgchem.8b00538.

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42

Chen, Qi, Qinqin He, Mengmeng Lv, Xueting Liu, Jin Wang, and Jianping Lv. "The vital role of PANI for the enhanced photocatalytic activity of magnetically recyclable N–K2Ti4O9/MnFe2O4/PANI composites." Applied Surface Science 311 (August 2014): 230–38. http://dx.doi.org/10.1016/j.apsusc.2014.05.046.

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43

Pal, Dharmendra, Shahanshah Haider Abdi, and Manisha Shukla. "Structural and EPR studies of Lithium inserted layered Potassium tetra titanate K2Ti4O9 as material for K ions battery." Journal of Materials Science: Materials in Electronics 26, no. 9 (May 31, 2015): 6647–52. http://dx.doi.org/10.1007/s10854-015-3265-z.

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44

Ma, Yanlin, Zhaoping Deng, Zepeng Li, Quanzhi Lin, Yuhang Wu, and Weisha Dou. "Adsorption characteristics and mechanism for K2Ti4O9 whiskers removal of Pb(II), Cd(II), and Cu(II) cations in wastewater." Journal of Environmental Chemical Engineering 9, no. 5 (October 2021): 106236. http://dx.doi.org/10.1016/j.jece.2021.106236.

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45

Wang, Xun, Yu-Xuan Li, Xiao-Hong Yi, Chen Zhao, Peng Wang, Jiguang Deng, and Chong-Chen Wang. "Photocatalytic Cr(VI) elimination over BUC-21/N-K2Ti4O9 composites: Big differences in performance resulting from small differences in composition." Chinese Journal of Catalysis 42, no. 2 (February 2021): 259–70. http://dx.doi.org/10.1016/s1872-2067(20)63629-4.

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46

Liu, Yi, Yingxin Li, Fan Li, Yizhuo Liu, Xiaoyan Yuan, Lifeng Zhang, and Shouwu Guo. "Conversion of Ti2AlC to C-K2Ti4O9 via a KOH assisted hydrothermal treatment and its application in lithium-ion battery anodes." Electrochimica Acta 295 (February 2019): 599–604. http://dx.doi.org/10.1016/j.electacta.2018.11.003.

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47

Saothayanun, Taya Ko, Thipwipa Tip Sirinakorn, and Makoto Ogawa. "Ion Exchange of Layered Alkali Titanates (Na2Ti3O7, K2Ti4O9, and Cs2Ti5O11) with Alkali Halides by the Solid-State Reactions at Room Temperature." Inorganic Chemistry 59, no. 6 (February 27, 2020): 4024–29. http://dx.doi.org/10.1021/acs.inorgchem.9b03695.

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48

Ogura, S., K. Sato, and Y. Inoue. "Effects of RuO2 dispersion on photocatalytic activity for water decomposition of BaTi4O9 with a pentagonal prism tunnel and K2Ti4O9 with a zigzag layer structure." Physical Chemistry Chemical Physics 2, no. 10 (2000): 2449–54. http://dx.doi.org/10.1039/b000187m.

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49

Wang, Fang, Yong Tao Zhang, Yanli Xu, Xing Wang, Sunfeng Li, Hanbiao Yang, Xueting Liu, and Fengyu Wei. "Enhanced photodegradation of Rhodamine B by coupling direct solid-state Z-scheme N-K2Ti4O9/g-C3N4 heterojunction with high adsorption capacity of UiO-66." Journal of Environmental Chemical Engineering 4, no. 3 (September 2016): 3364–73. http://dx.doi.org/10.1016/j.jece.2016.07.008.

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50

Ansari, S. "Application of hollow porous molecularly imprinted polymers using K2Ti4O9 coupled with SPE-HPLC for the determination of celecoxib in human urine samples: optimization by central composite design (CCD)." Analytical Methods 9, no. 21 (2017): 3200–3212. http://dx.doi.org/10.1039/c7ay00547d.

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