ABSTRAKNanopartikel ZnO merupakan salah satu material anorganik yang memiliki sifat absorpsi ultraviolet/UV dan dapat diaplikasikan pada material tekstil untuk memperoleh kemampuan proteksi UV. Dalam penelitian ini dipelajari sintesis nanopartikel ZnO dan immobilisasinya pada kain kapas sebagai absorber UV. Metodologi penelitian meliputi sintesis suspensi nanopartikel ZnO dan immobilisasi nanopartikel pada kain kapas dengan metode pad-dry-cure menggunakan agen kationisasi trietilamina (TEA). Evaluasi dilakukan terhadap morfologi nanopartikel yang terimmobilisasi pada permukaan kain, ketahanan perlekatan nanopartikel pada kain dan uji kekuatan tarik pada kain setelah irradiasi UV. Hasil scanning electron microscopy/SEM menunjukkan nanopartikel ZnO terbentuk dan terimmobilisasi pada permukaan kain dengan ukuran partikel antara 100-500 nm. Nanopartikel ZnO yang terkationisasi dengan TEA 5% memperlihatkan perlekatan yang baik pada kain kapas setelah melalui uji siram hujan. Setelah irradiasi UV selama 10 jam, penurunan kekuatan tarik pada sampel kain dengan nanopartikel ZnO pada arah lusi dan pakan masing-masing sebesar 10,6% dan 9,5%, lebih rendah dibandingkan sampel kain tanpa nanopartikel ZnO dengan penurunan kekuatan tarik masing-masing sebesar 23,6% dan 22,6% pada arah lusi dan pakan.Kata kunci: kationisasi, kain kapas, nanopartikel ZnO, absorption, ultraviolet.
ABSTRACTZnO nanoparticle is one of inorganic materials which have ultraviolet/UV absorption property and possibly applied on textile material to obtain UV protection performance. Synthesis of ZnO nanoparticles and its immobilization onto cotton fabric as UV absorber was studied in this research. Research methods including synthesis of ZnO nanoparticles suspension, and immobilization of nanoparticles onto cotton fabric applying paddry-cure method cationization of cotton fabric using triethylamine (TEA) as cationizing agent. Evaluations have been done upon immobilized nanoparticles morphology on fabric surface, durability of nanoparticles attachment on fabric and tensile strength testing to the fabric after UV irradiation. Scanning electron microscopy/SEM result shows that ZnO nanoparticles formed and immobilized on fabric surface with particle size ranging in 100-500 nm. Nanoparticle which has cationized with TEA 5% shows good attachment on cotton fabric after passing rain shower test. After 10 hrs of UV irradiation, reduction of tensile strength in fabric containing ZnO nanoparticles for warp and weft directions were found 10.6% and 9.5% respectively, lower than that of fabric without ZnO nanoparticles with 23.6% and 22.6% of respective reduction in warp and weft directions.
The photocatalytic degradation of textile wastewater containing Reactive Black 5 (RB5) azo dye was investigated by using immobilized TiO 2 nanofiber-nanoparticle composite catalyst on glass plates. The process was studied by monitoring the change in RB5 concentration, depletion in total organic carbon (TOC) and by determining the intermediate products using UV-visible spectrophotometry and gas chromatography-mass spectrometry (GC-MS) techniques. After immobilization, the composite shows higher photocatalytic activity for degradation of RB5 than that of nanoparticle thin-film layer under UV irradia-ion. Complete decolorization was achieved in 120 min, corresponding to organic degradation with a reduction in TOC after 300 min of UV irradiation by 91%. The photocatalytic degradation mechanism of RB5 was proposed based on the identified compounds by GC-MS technique, showing the destruction of the azo dye structure, which became smaller molecular mass compounds. The degradation slightly decreased after multiple reuse of composite catalyst during photocatalytic treatment. The recovery of its photocatalytic performance was obtained through reannealing.
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