Chitosan/multilayered MXene Nanocomposites Loaded in 3D Nitrogen-Doped Carbon Networks for Seawater Desalination with Highly Efficient Photothermal Conversion
Chitosan/multilayered MXene Nanocomposites Loaded in 3D Nitrogen-Doped Carbon Networks for Seawater Desalination with Highly Efficient Photothermal Conversion
复制标题
DOI：
10.1002/adsu.202300056
复制
发表时间：
2023-05-14
影响因子：
7.1
通讯作者：
Liu, Jingquan
中科院分区：
文献类型：
--
作者：
Jin, Yang;He, Yujian;Liu, Jingquan
阳光作为取之不尽用之不竭的绿色能源之一，越来越受到人们的关注，特别是在当今传统化石燃料迅速枯竭的情况下。壳聚糖（CHT）是一种丰富的天然产物，可以转化为具有很强的光吸收能力的氮掺杂多孔碳。在此，壳聚糖与手风琴状多层 mMXene (mMXene) 一起使用三聚氰胺泡沫 (MF) 作为模板来制造 3D 隔热且低成本的复合材料。然后将获得的具有不同mMXene/壳聚糖质量比的MF/CHT/mMXene（MCM）复合材料在500℃下进行简单退火处理2小时，得到3D和自浮碳化的碳化MF/CHT/mMXene（CMCM）复合材料。 CHT/mMXene质量比为1:1得到的CMCM-1表现出低导热率、高亲水性和良好的吸光度。用作纯水和海水蒸发器时，在1 kW·m(-2)辐照下蒸发率可达1.554和1.428 kg·m(-2)·h(-1)，光热转换效率可达89.8%。此外，CMCM-1复合材料还表现出优异的脱盐能力、自脱盐能力、良好的循环稳定性和可靠的安全性能。结合这些优点，CMCM-1复合材料可能在海水蒸发和废水处理等方面具有潜在的实际应用。
Sunlight, as one of the inexhaustible green energy sources, is attracting rising attention, particularly with the rapid depletion of traditional fossil fuels nowadays. Chitosan (CHT) is an abundant natural product that can be converted into N-doped porous carbon which has a strong light absorption ability. Herein, chitosan is employed with the accordion-like multilayered mMXene (mMXene) to fabricate the 3D thermally insulated and low-cost composites using melamine foam (MF) as a template. The obtained MF/CHT/mMXene (MCM) composites with different mass ratios of mMXene/chitosan are then subject to a simple annealing treatment at 500 degrees C for 2 h to afford 3D and self-floating carbonized carbonized MF/CHT/mMXene (CMCM) composites. The CMCM-1 obtained with mass ratio of CHT/mMXene at 1:1 displays low thermal conductivity, high hydrophilicity, and good light absorbance. When it is utilized as the evaporator of pure water and seawater, its evaporation rates can reach at 1.554 and 1.428 kg m(-2) h(-1) under 1 kW m(-2) irradiation and the photothermal conversion efficiency can reach at 89.8%. In addition, the CMCM-1 composite also displays excellent desalination ability, self-desalination ability, good cycle stability, and reliable safety performance. Combining these advantages, CMCM-1 composite may have potential practical applications for seawater evaporation and wastewater treatment, etc.