Underwater Photosynthesis of Submerged Plants

1 January 2018

The concept of photosynthesis was understood when the growth of Plants was studied. It is a natural process in which sunlight is used to prepare the required nutrient for the plant with the help of the green pigment of plants, i.e, and chlorophyll. However, when the sun sets there is no way that plant can prepare their meal. In the process of photosynthesis absorb carbon dioxide, carbon is converted into glucose and “consume” for their life-supporting needs, and oxygen is released into the atmosphere. In artificial photosynthesis, scientists are trying to create something similar with more expenditure of carbon dioxide from the environment. SO, artificial photosynthesis came into the process which emphasizes on receiving most of the energy from the sunlight and meant to effectively accumulate this energy as to utilize in the required time.

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The energy from the sunlight will be transformed into the chemical energy due to which it becomes more suitable for its storage. In this conversion, side products are not produced like the greenhouse gases. On the contrary, in the process carbon dioxide can be utilized in the same way as it does in plants. Artificial photosynthesis is developed through which plants can absorb carbon dioxide several times faster.

Plants for this use chlorophyll. It is contained in leaves and captures sunlight, and a set of enzymes and other proteins uses this light to split water molecules into hydrogen, electrons, and oxygen (protons). Electrons and hydrogen are used to convert CO2 into nutrients for the plant, and oxygen is released into the atmosphere.
To recreate photosynthesis in artificial conditions, two key steps are necessary: the ability to collect solar energy, and the ability to split water molecules. But unlike natural photosynthesis, it is necessary that the output is not oxygen, but hydrogen (or other biogas, for example, methane).

An artificial sheet is a very place where semiconductors and living bacteria are placed, on which sunlight shines. To start the process of artificial photosynthesis in an artificial leaf during that very first experiment, scientists placed all the materials in the water, where carbon dioxide was pumped, while illuminating this entire system with sunlight. Semiconductors in this process collect solar energy, generating the charge necessary for the reaction in this solution to take place. The bacterium uses electrons generated by a semiconductor to convert (or reduce) the molecules of carbon dioxide, and as a result, create a liquid fuel – it can be hydrogen, methane, ethanol, etc. At the same time, water is oxidized on the surface of another semiconductor and oxygen is released. But splitting the water molecule is not so simple; it requires about two and a half electron volts of energy. Therefore, we need a catalyst that “pushes” the chemical reaction.

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