In recent years, with the development of batteries, ceramics, glass and other industries, the demand for lithium has increased rapidly. Due to the rich lithium resources in seawater and salt-lake brine, the question of how to selectively adsorb and separate lithium ions from such brine has attracted the attention and research of many scholars. The Li-ion sieve stands out from other methods thanks to its excellent special adsorption and separation performance. In this paper, mesoporous titanium dioxide and lithium hydroxide were prepared by hydrothermal reaction using bacterial cellulose as a biological template. After calcination at 600 °C, spinel lithium titanium oxide Li2TiO3 was formed. The precursor was eluted with HCl eluent to obtain H2TiO3. The lithium titanate were characterized by IR, SEM and X-ray diffraction. The adsorption properties of H2TiO3 were studied by adsorption pH, adsorption kinetics, adsorption isotherm and competitive adsorption. The results show that H2TiO3 has a single-layer chemical adsorption process, and has a good adsorption effect on lithium ions at pH 11.0, with a maximum adsorption capacity of 35.45 mg g−1. The lithium-ion sieve can selectively adsorb Li+, and its partition coefficient is 2242.548 mL g−1. It can be predicted that the lithium-ion sieve prepared by biological template will have broad application prospects.
Recycling dysprosium from the environment can not only alleviate the industrial crisis, but also reduce the ecological pollution caused by dysprosium ions. At present, the price of the materials used to adsorb rare earth ions is generally high, which is not conducive to the wide application of the adsorbents in the rare earth industry. In this paper, based on the 3D network structure of carboxylated bacterial cellulose, some cheap materials such as attapulgite and gelatin were used to replace the high-priced raw materials, and a low-cost and green I-APT-GT-OBC aerogel was prepared. To test the adsorption properties of the composite aerogel, we carried out a series of adsorption experiments. The results showed that the saturated adsorption capacity of dysprosium ions by the imprinted aerogel was 48.762 mg g − 1 when the pH value was 5.0, and the adsorption process was spontaneous, endothermic and entropy increasing. In the competitive adsorption experiment, the K d value of I-APT-GT-OBC for dysprosium ions was 4084.40 mL g − 1 , which was much higher than that of other aerogels, showing excellent selective adsorption. In conclusion, I-APT-GT-OBC is expected to be a low-cost adsorbent that can e ciently adsorb dysprosium ions in water.
Due to the increasingly serious problem of offshore oil spills, research related to oil–water separation has attracted more and more attention. Here, we prepared a super-hydrophilic/underwater super-oleophobic membrane (hereinafter referred to as BTA) using poly-dopamine (PDA) to adhesive TiO2 nanoparticles on the surface of bacterial cellulose, coated with sodium alienate by vacuum-assisted filtration technique. This demonstrates its excellent underwater super-oleophobic property. Its contact angle is about 153°. Remarkably, BTA has 99% separation efficiency. More importantly, BTA still showed excellent anti-pollution property under ultraviolet light after 20 cycles. BTA has the advantages of low cost, environmentally friendliness and good anti-fouling performance. We believe it can play an important role in dealing with problems related to oily wastewater.
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