RESUMO
Fluoride (F) and arsenic (As) are two typical and harmful elements that are found in high concentrations in geothermal water in Tibet. In this work, yak dung, an abundant source of biomass energy in Tibet, was made into biochars (BC1, BC2 and BC3) by pyrolysis under different conditions, and the better biochar was modified by FeCl2 (Fe-BC3). The adsorption conditions were optimized to adsorb F and As in geothermal water. The results showed that BC3 can remove 90% F- and 20% As(V), which is the best effect of the three initial biochars. Fe-BC3 could remove 94% F- and 99.45% As(V) under the same conditions as BC3, which was an adsorbent dosage 10 g l-1, pH 5-6 and temperature of 25°C. It was also demonstrated that the removal rate did not decrease at 80°C. A quasi-second-order kinetic model best described the adsorption behaviour of ions on the surface of the biochar. The maximum adsorption capacity of F- and As(V) on Fe-BC3 was 3.928 mg g-1 and 2.926 mg g-1, respectively. The features of Fe-BC3 were characterized by X-ray diffraction, Fourier transform infrared, Brunauer-Emmett-Teller, energy-dispersive spectrometer and scanning electron microscopy to understand the adsorption process.
RESUMO
The therapeutic methods for the treatment of primary liver cancer is in abundant supply, yet the prognosis far from satisfactory. The article mainly introduces the progress in hepatectomy, liver transplantation, ablation therapy, interventional therapy, radiotherapy, drug therapy, and biological immunity in the treatment of primary liver cancer, and it also briefs us on the multidisciplinary and comprehensive treatment of primary liver cancer, believing that comprehensive treatment is the key to improving the overall response of primary liver cancer by giving full play to the superiority of each treatment and achieving the optimal therapeutic effect.