Preparation And Properties Of FeOOH/CBC Nanocomposite

Fe OOH is an excellent semiconductor material with stable che mical properties. There are numerous hydroxyl groups in the surface of Fe OOH, which has a wide range of uses in catalysis, adsorption, pigments and ma gnetic materials. However, Fe OOH nanoparticles are apt to agglo merate due to nano meter size effect. Therefore, preventing aggregation and i mproving the recycle ability has a very i mportant i mpact on their physical and che mical properties and application pe rfor mance. In the study, carbonized bacterial cellulose(CBC) is a high-purity carbon fiber with three-di mensional network providing an ideal platform for the deposition of metal and metal oxide nanoparticles, acting as the carrier, by in situ hydrolysis o f Fe Cl3 ? 6H2 O to prepare three-dime nsional network of porous Fe OOH/CBC nanocomposite and study its properties. The main contents are as follows:(1) Preparation of Fe OOH/CBC nanocomposite. Fe OOH/CBC nanocomposite was successfully prepared with na no meter-scale Fe OOH loaded on the surface of carbonized bacterial cellulose(CBC) by hydrolysis of Fe Cl3?6H2O. The structure and morphology of Fe OOH/CBC nanocomposite were characterized using X-ray diffraction(XRD), fourier transform infrared spectrometer(FI-IR), bruna uer-emme tt-teller(BET), field emission scanning electron microscopy(FE-SEM), trans mission electron microscopy(TEM) and high resolution trans mission electron microscopy(HRTEM). The results show that Fe OOH/CBC has a unique three-di mensional(3D) porous network structure. Fe OOH na noparticles with an average length of 120 nm, wide of 30 nm are shuttle-like.(2) Adsorption properties of Fe OOH/CBC nanocomposite for methyl orange. The adsorption properties of Fe OOH/CBC na nocomposite for methyl orange(MO) were characterized by using UV- Vis. A series of batch experi ments were performed to investigate the in?uence of adsorbent dosage, contact time, adsorption kinetics, adsorption thermodyna mics, p H values and recycle times on MO removal under the sa me conditions. The results showed that the adsorption equilibrium o f as-prepared Fe OOH/CBC nanocomposite for methyl MO was achieved within one hour, with the maxi mum adsorption capacity for MO reaching 107.68 mg/g at p H 6.0 and 30 ℃. As-prepared Fe OOH/CBC nanocomposite maintains high adsorption activities after four times of adsorption and desorption, accompanying the removal rate for MO is up to 60 % in 10 min.(3) Study catalytic activity of Fe OOH/CBC nanoco mposite on ammo niu m perchlorate(AP) catalytic properties. Catalytic activity of Fe OOH/CBC nanocomposite in the thermal decomposition of AP was investigated using DS C and TG-MS. With the addition of Fe OOH/CBC, the thermal decomposition temperature of AP is reduced to 288.7 °C and the apparent heat of decompos ition increases from 667.1 to 2838.0 J/g. The XRD and TG-MS results demo nstrate that Fe OOH/CBC, rather than Fe2O3/CBC, plays a catalytic role in the thermal decomposition of AP. In addition, Fe OOH/CBC has a significant effect o n dechlorinating the products of AP decomposition, indicating that it is a highl y efficient and environme nt-friendly catalyst. The catalytic role it apparently plays in the thermal decomposition of AP is also discussed.