ABSTRAKFotokatalis merupakan suatu proses transformasi senyawa kimia yang dibantu oleh adanya material katalis dan cahaya. Teknologi fotokatalis sering digunakan untuk mengolah air polutan maupun limbah tekstil. Industri tenun ikat di Bandar Kidul, Kediri menggunakan pewarna sintesis sehingga menghasilkan limbah pewarna yang dapat mencemari lingkungan. Pada penelitian ini telah disintesis N/TiO2 menggunakan metode wet impregnation (impregnasi basah) untuk menjernihkan limbah batik tenun Kediri. Sintesis dilakukan dengan mereaksikan TiO2 yang dilarutkan ke dalam Aqua DM dan urea  dengan variasi konsentrasi 1;2;3;4;5 %(b/b)(N/Ti). Berdasarkan hasil karakterisasi diketahui bahwa semakin besar konsentrasi urea yang ditambahkan, material N/TiO2 yang dihasilkan memiliki ukuran kristal dan band gap(Eg) yang semakin kecil. Selain itu, permukaan yang dihasilkan pada N/TiO2 5% lebih teratur atau homogen apabila dibandingkan dengan TiO2 undoped.. Berdasarkan hasil uji aktifitas fotokatalis N/TiO2 terhadap limbah batik tenun diketahui bahwa material katalis dengan hasil limbah paling jernih adalah material dengan konsentrasi urea paling besar, yaitu N/TiO2 5%. Hal ini menunjukkan bahwa semakin besar konsentrasi yang ditambahkan maka fotoaktivitas yang dihasilkan akan semakin besar Kata Kunci: Fotokatalis;TiO2;N/TiO2; Limbah batik tenun ikat. ABSTRACTPhotocatalyst is a process transformation of chemical compounds under UV irradiation in the presence of catalyst material. Photocatalyst technology is often used to treat pollutant water or textile waste. Tenun ikat industry in Bandar Kidul Kediri uses synthetic dyes so it produce dye waste which can pollute the environment. The effect of variations of concentration of urea on synthesis of N/TiO2 material by wet impregnation  in order to purify the batik weaving waste in Kediri had been studied. The synthesis of N/TiO2 was done by mixing TiO2 in aqua DM and urea with the variation of concentration 1,2,3,4 and 5% (w/w) (N/Ti). Based on the characterization results, it is known that the more concentration of urea added, the N/TiO2 material has a smaller crystal size and a smaller band gap (Eg). In addition, the surface produced at N/TiO2 5% is more even or homogeneous when compared to undoped TiO2. Based on the results of the N/TiO2 photocatalyst activity test on woven batik waste, it is known that the catalyst material with the clearest waste results is the material with the highest urea concentration, which is  N/TiO2 5%. This shows that the more concentration added the greater the photoactivity produced. Key words: Photocatalyst;TiO2; N/TiO2; woven batik waste.

The development of the textile industry in Indonesia is rapid. It cause serious environmental problems because the dyes used in the textile industry are synthetic that is azo dyes. Azo dyes are non-biodegradable substances that pollute the environment if not processed. One of the azo dyes that is often used in the textile industry is Methyl Orange. Photodegradation is an inexpensive and environmentally friendly method of removing synthetic dyes. This study will discuss the effect of adding orange peel on the characterization of ZnO and the ability to degrade Methyl Orange. The results of the FTIR spectra showed an absorption in the area of 1430-1455 cm-1 that means the orange peel had been impregnated into ZnO and the more ZnO as added on orange peel, it may reduce the number of -OH and CH groups of the ZnO/OP composite. Based on the results of characterization using XRD, it is known that the addition of orange peel into ZnO did not damage the crystal structure and crystal form. The crystal structure of ZnO/OP formed was wurtzite with a hexagonal shape. The results of the characterization using DR-UV showed that the band gap energy of ZnO/OP was smaller than ZnO and the more ZnO was added, the wider the band gap of energy. ZnO/OP with a variation of 1:25 can degrade Methyl Orange more than ZnO that was 73% in 60 minutes.