This study aims to test the temperature sensor that will be used in the biochar production furnace. Temperature testing is carried out to determine the ability of the sensor to respond to temperature changes that will be applied to the furnace. The sensors used in this system are the K-type thermocouple and the MAX6675 module. Testing is done by forming a control system. The system will be installed in the furnace by providing heating with fire in the furnace. The result of the maximum temperature was 574.25 °C at 575 seconds of heating for 1110 seconds. The test of corelation between the sensor output voltage to temperature when the temperature is raised from the beginning to the maximum, the sensor sensitivity is obtained at 5.1762 mV / °C and the slope of the graph is close to 1. Testing the relationship of the sensor output voltage to temperature when the temperature is lowered from the maximum point, the sensor sensitivity is obtained at 4.878 mV / °C and an offset voltage of 25 mV. The voltage-to-time correlation of the two tests is close to the value of 1, which means that the sensor linearity is very good so that it can be used as a temperature measurement tool.
Pembuatan TiO2 didoping dengan biochar telah dilakukan, variasi doping yang diberikan adalah sebesar 0%, 1%, 2%, 3% dan 4%. Sampel TiO2/biochar kemudian dikarakterisasi dengan FTIR untuk dapat dianalisis gugus fungsi seluruh sampel. Berdasarkan spektrum FTIR yang diperoleh bahwa pada seluruh sampel muncul gugus fungsi khas TiO2 yaitu Ti-O pada puncak serapan sekitar 700 – 950 cm-1. Ikatan vibrasi O-H stretching dan O-H bending muncul pada seluruh sampel menunjukkan adanya molekul air. Selain itu ikatan vibrasi O-C-O dan C-H muncul menunjukkan adanya penggunaan bahan organik polimer PVA pada proses sintesis. Setelah proses doping dilakukan, muncul gugus fungsi C≡C pada sampel doping 1%, 2%, 3% dan 4% yang menunjukkan adanya ikatan karbon yang berasal dari biochar. Pada sampel 4% biochar muncul ikatan vibrasi Ti-O-C yang menunjukkan adanya interaksi antara TiO2 dengan karbon dari biochar.
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