| Photocatalysis brings a new way to exploit renewable energy resource and environment remediation using abundant sunlight,which can solve the energy and environmental issues.Until now,many photocatalysts have been extensively studied for hydrogen production and degradation of organic pollutants.As a traditional photocatalyst,TiO2 have been widely applied in water splitting and environment treatment,but it has practical limitations due to their intrinsic band gaps,which is mainly photosensitive in the UV range.Therefore,the exploration of efficient and environmental photocatalysts is the highly challenge in the photocatalytic fields.In this work,we have improved the photocatalytic activity of indium-containing semiconductors?InOOH,?-In2S3 and?-In2Se3?by control of morphologies and metal ions doping.In our work,the liquid synthesis?solvothermal method and hot-injection method?is the main synthesis approach.The structure of samples was characterized in detail.In addition,the samples were tested by degradation of RhB and photocatalytic hydrogen generation.We have obtained the following conclusions:We report a simple,one-step solvothermal procedure to prepare InOOH nanosheets using ethylene glycol and water as solvent.By simply adjusting the ratio between ethylene glycol and water,it was found that the products could be systematically tailored,yielding different morphologies like nanosheets and microflowers.The photocatalytic and photoelectrochemical properties of InOOH nanosheets were evaluated under UV illumination.RhB solution(1.0×10-5mol/L)was completely degraded within 50 min under UV illumination.The superior photocatalytic activity of InOOH nanosheets can be ascribed to the sheet-like nanostructures.We report on a simple acetic acid-assisted solvothermal process for the synthesis of InOOH nanospheres with porous structures.The effects of reaction parameters such as reaction temperature and the effect of acetic acid are systematically investigated.The photocatalytic properties of porous InOOH nanospheres in the degradation of RhB were evaluated under UV illumination.RhB solution(1.0×10-5mol/L)was completely degraded within 120 min under UV illumination.The superior photocatalytic activity of InOOH nanosheets can be ascribed to the mesoporous structures and large specific surface area(60.63 m2 g-1).We report on a simple solution chemical method for the preparation of amphiphilic?-In2S3 hierarchical nanostructures stacked by ultrathin nanosheets.These?-In2S3hierarchical nanostructures have larger specific surface area(135.4 m2 g-1).We systematically demonstrated the application of the amphiphilic?-In2S3 hierarchical structures as adsorbents for dyes adsorption and oil/water separation.The?-In2S3adsorbents exhibited high adsorption capacities for the removal of both Rhodamine B?RhB?and Congo red?CR?.More importantly,these amphiphilic?-In2S3 hierarchical nanostructures can selectively adsorb oils from oil/water mixtures with high adsorption capacities.Because of?-In2S3 hierarchical nanostructures possess amphiphilicity,selective absorption and high adsorption capacities for dyes and oils,and thus they could be used for water purification and treatment.Ca???doped?-In2S3 hierarchical structures stacked by 2D nanosheets were successfully fabricated via a simple solution chemical process.We systematically investigated the effects of the reaction temperature and Ca2+concentration on the size and morphology of the products.A possible formation process of Ca?II?doped?-In2S3hierarchical structures was proposed.The Ca?II?doped?-In2S3 hierarchical structures showed promising activity towards photocatalytic hydrogen production(145.0?mol g-1)and RhB solution(1.0×10-5mol/L)was completely degraded within 100 min under visible light irradiation.The excellent degradation dye activities of Ca?II?doped?-In2S3hierarchical structures are mainly attributed to the large amount of effectively reactive species like h+and·O2-.The highly efficient photocatalytic H2 production activity of Ca???doped?-In2S3 hierarchical structure could be mainly ascribed to the following reasons.First,the hierarchical structure could allow multiple reflections of visible light for the increased light absorption.Then,the thin nanosheets could allow photoexcited charge carriers to move from the interior to the surface rapidly in order to participate in the photocatalytic reaction.Because of non-toxicity,triethylene glycol was selected for solvent to prepare the In2Se3 semiconductors for the first time.We report a facile hot-injection synthesis route to prepare?-In2Se3 polyhedral nanoparticles through the reaction of InCl3 with Se using triethylene glycol as solvents.The reaction temperature plays a key role in the formation phase of hexagonal?-In2Se3.When PVP or PVP and PAA were selected as surfactants,?-In2Se3 nanosheets and?-In2Se3 rice-like nanoparticles were prepared.The possible formation mechanisms of In2Se3 semiconductors with three morphologies were proposed.Furthermore,the obtained In2Se3 polyhedral nanoparticles exhibit the best efficient hydrogen evolution capacity(866.9?mol g-1h-1)in three morphologies under simulated sunlight irradiation.The stability of photocatalytic activity was also investigated.The photocatalytic H2 production activity of In2Se3 semiconductors with three morphologies can be maintained. |
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