A wet oxidation system of titanium silicalite-1 (TS-1)/hydrogen peroxide (H2O2) was proposed for gaseous hydrogen sulfide (H2S) removal in this study, and the effects of the TS-1 dosage, H2O2 concentration, H2S concentration, reaction temperature, gas flow, and reaction time on the removal rate of H2S (η) were investigated. Samples were characterized by transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance, and N2 adsorption–desorption. An experiment using isopropanol, benzoquinone, and butylated hydroxytoluene was carried out as well to verify the active substance in the TS-1/H2O2 system. The results show that η reached 86.3% when bubbling 160 ppm of H2S through a 500 mL solution (pH 4.21) containing TS-1 (0.5 g/L) and H2O2 (0.33 mol/L, 1.12 wt %) at 293 K and atmospheric pressure with a flow rate of 265 mL/min. Subsequently, the mechanism of the reaction was proposed. After the H2S diffuses onto the surface of TS-1, it is first oxidized by adsorbed H2O2 and eventually oxidized to H2SO4; this process is controlled by H2S diffusion. The final product of the process is sulfuric acid, which is pollution-free and can be recycled to achieve resource utilization. The removal of H2S by the TS-1/H2O2 system is a green, simple, low-cost, resource-saving, safe, and efficient method.
Superhydrophilic and underwater superoleophobic cotton fabric (named CS-CF-PDA, or m-CF) was prepared by modifying the cotton fabric (CF) with dopamine (DA) and chitosan (CS). The oil–water separation and heavy-metal ion (e.g., Cu(II)) adsorption performances of m-CF were investigated, and m-CF was characterized by field emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS), Fourier transform infrared (FT-IR), and thermogravimetric analysis (TGA). The results showed that the underwater oil contact angle (UWOCA) of m-CF was more than 156°. The m-CF was used to treat artificial oily wastewater containing Cu(II) under room temperature and atmospheric pressure and gravity, by which the separation efficiency, water flux, and Cu(II) removal rate could reach 99%, 17 400 L·m –2 ·h –1 , and 89%, respectively. Additionally, in the process of continuous treatment of oily wastewater, the water flux slightly decreased; on the contrary, the Cu(II) removal rate decreased significantly to 67% within 120 s. Cu(II) was one of the reasons for the decrease of water flux. The m-CF of adsorbed Cu(II) could be leached with HCl (0.1 mol·L –1 ) solution, and the Cu(II) desorption rate could reach over 95% within 120 s. After strong acid, strong alkali, high salt, and abrasion treatment, the UWOCAs of m-CF were still higher than 150°. In a word, in terms of oil–water separation, m-CF exhibited good acid, alkali, salt, and abrasion resistances. Also, it is an underwater superoleophobic material involving simple preparation, low cost, and environmental friendliness, which could remove the floating oil and heavy-metal ions from wastewater and has good industrial application prospects.
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