Synthesis of Patchouli Biochar Cr2O3 Composite Using Double Acid Oxidators for Paracetamol Adsorption
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![Figure 1. FTIR spectra of composites prepared using 3 different oxidator mixture (HPHN=H3PO–HNO3; HS–HN=H2SO4–HNO3; HO–HN=H2O2–HNO3)](https://thumb-ap.123doks.com/thumbv2/123dok/2862425.1694541/3.595.127.468.421.661/figure-ftir-spectra-composites-prepared-different-oxidator-mixture.webp)
![Figure 3. oxidation treatment using 3 different double oxidizing agents (HP FTIR absorbance of C=O, C–O, and O–H functional groups of biochar after –HN=H3PO4–HNO3; HS–HN=H2SO4–HNO3; HO–HN=H2O2–HNO3)](https://thumb-ap.123doks.com/thumbv2/123dok/2862425.1694541/4.595.172.424.543.699/figure-oxidation-treatment-different-oxidizing-absorbance-functional-biochar.webp)
![Figure 4. X-ray diffractogram of biochar–Cr2O3 composite which was prepared using H2SO4–HNO3](https://thumb-ap.123doks.com/thumbv2/123dok/2862425.1694541/5.595.124.474.284.493/figure-ray-diffractogram-biochar-composite-prepared-using-hno.webp)
![Figure 5. SEM images of the composites prepared using 3 different double oxidizing agents (HP–HN=H3PO4–HNO3; HS–HN=H2SO4–HNO3; HO–HN=H2O2–HNO3)](https://thumb-ap.123doks.com/thumbv2/123dok/2862425.1694541/6.595.129.465.132.458/figure-images-composites-prepared-different-double-oxidizing-agents.webp)
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