The current researches on the recycling of waste liquid crystal displays (LCDs) are hard to widely industrialize that require low-cost, rapid and green technologies . In this study, we shortened the acetone soaking time from at least 20 h to 30 min to separate polarizer . In addition, indium bioleaching using Aspergillus niger ( A. niger ) was firstly explored. The efficiency of indium bioleaching from fermentation broth could reach 100% within 90 min at 70 °C, and the glass residues could be reused. Oxalic acid showed excellent abilities on indium bioleaching process according to the analysis of Fourier transform infrared spectroscopy and kinetics. Furthermore, the leaching parameters of low-concentration oxalic acid solution were optimized using response surface method to improve the powder dosage from 10 to 150 g/L. Therefore, this research promoted bioleaching technology development using A. niger and formed a sustainable process in industry for the recovery of valuable materials from waste LCDs.
Yao Qiang,Guo Jing,Guan Fucheng,Zhao Miao,Zhang Sen,Tuo Xiaohang,Yang Qiang
As a transition metal dichalcogenides (TMDCs), molybdenum disulfide (MoS 2 ) comprises individual sheets stacked into a bulk-phase structure. Compared with bulk-phase MoS 2 , the few-layer MoS 2 presents a two-dimensional nanostructure similar to graphene, which has the advantages of large specific surface area and many unsaturated vacancies in the edge layer and has broad application prospects in the fields of photoelectricity and catalysis. Here, a simple and practical method of exfoliating bulk-phase MoS 2 is proposed. The bulk-phase MoS 2 was sonicated using chitosan/acetic acid (CS/HAc) solution to obtain oligomeric MoS 2 . The raw materials used in this method have good biocompatibility, the preparation process and operation are simple, and the pollution caused to the environment is small, which meets the green chemical standard. The method provides a new idea and way for the peeling treatment of other laminated materials. The results show that the stacking of (002) crystal plane of MoS 2 samples after treatment with CS/HAc solution is reduced and the crystalline phase is changed from polycrystalline to single-crystal structure, which has great potential for applications in optical and electrical fields.
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