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首页> 外文期刊>International Journal of Photochemistry and Photobiology >Lignocelluloses Modified TiO_2 Nanomaterials as Renewable Photocatalyst for Water Splitting
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Lignocelluloses Modified TiO_2 Nanomaterials as Renewable Photocatalyst for Water Splitting

机译：木质纤维素改性的TiO_2纳米材料作为可再生水分解光催化剂

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Photocatalytic water splitting process is a hopeful means to solve depletion and environmental pollution problems caused by fossil fuels as well as for sustainable hydrogen production using renewable natural resources like sunlight and biomass (cotton stalk). In this study the aim was to fabricate cotton stalk extracted Lignocellulose (LGO) Titanium oxide (TiO_2) nanoparticles via sol-gel in ethanol and to investigate their photocatalytic water splitting activities under Visible light irradiation. Hence, in this study the opportunity for structural development of lignocellulose (LGO) modified TiO_2 nanomaterial towards highly efficient and realistic photocatalysis applications are evidently abundant after improved light absorption, charge-carrier dynamics, and improved particle size porosity that benefits photocatalysis functionalities. LGO-TiO_2 nanoparticle, (≈19.57 nm) for photocatalysis was prepared via sol-gel method. The fabricated nanomaterial photoelectrochemical characterization was operated using three electrode system with a photoanode as a working electrode, coiled Pt wire as a counter electrode and Hg/Hg_2Cl_2 as a reference electrode, and 0.5 M Na_2SO_4 (with pH buffered at 6.75) purged with N_2, solution was applied as a supporting electrolyte. The structural and morphological characterizations of the fabricated nanomaterial are carried out using FTIR, XRD, SEM, and EDX techniques, based upon which the mechanistic insights are discussed. SEM analysis suggests that an average size of particle grain size is found to be in the range of 0.5-4 μm. The photocurrent densities of regular TiO_2 and LGO-TiO_2 towards water splitting reaction under light illumination from xenon lamp were compared and found in reasonable agreement. The work also studied the application of visible light illuminated LGO-TiO_2 photoanode photocatalyst to the overall water splitting with a photoconversion efficiency of 18.91% higher than that of bare TiO_2 nanoparticles and this suggests that surface functionality, surface topography, porosity and particle size, as well as purity and chemical composition of the prepared sample was successfully functionalized.
机译：光催化水分解工艺是解决由化石燃料引起的消耗和环境污染问题以及使用可再生自然资源（例如阳光和生物质）（棉花秸秆）实现可持续制氢的有希望的手段。本研究的目的是通过溶胶-凝胶在乙醇中制备棉秆提取的木质纤维素（LGO）二氧化钛（TiO_2）纳米粒子，并研究其在可见光照射下的光催化水分解活性。因此，在这项研究中，木质纤维素（LGO）改性的TiO_2纳米材料在结构开发上朝着高效和现实的光催化应用发展的机会在改善了光吸收，电荷载流子动力学和改善了光催化功能的颗粒尺寸孔隙率之后，显然是丰富的。通过溶胶-凝胶法制备了LGO-TiO_2纳米粒子（≈19.57nm）用于光催化。使用三电极系统对制备的纳米材料进行光电化学表征，其中三电极系统以光阳极为工作电极，盘绕的铂丝为对电极，Hg / Hg_2Cl_2为参比电极，并用N_2吹扫的0.5 M Na_2SO_4（pH缓冲在6.75）溶液用作支持电解质。使用FTIR，XRD，SEM和EDX技术对所制备的纳米材料进行结构和形态表征，并在此基础上讨论了机械原理。 SEM分析表明，发现平均粒径为0.5-4μm。比较了普通TiO_2和LGO-TiO_2对氙灯光照下水分解反应的光电流密度，发现在合理的范围内。这项工作还研究了可见光照射的LGO-TiO_2光阳极光催化剂在整个水分解中的应用，其光转换效率比裸露的TiO_2纳米粒子高18.91％，这表明表面功能，表面形貌，孔隙率和粒径以及所制备样品的纯度和化学组成已成功实现功能化。

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