Hierarchically porous, ultra-strong reduced graphene oxide-cellulose nanocrystal sponges for exceptional adsorption of water contaminants†,Nanoscale

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Hierarchically porous, ultra-strong reduced graphene oxide-cellulose nanocrystal sponges for exceptional adsorption of water contaminants†
Nanoscale ( IF 5.8 ) Pub Date : 2018-03-26 00:00:00 , DOI: 10.1039/c7nr09037d
Nariman Yousefi _{1,

2,

3,

4} , Kerwin K. W. Wong _{1,

1,

2,

3,

4} , Zeinab Hosseinidoust _{1,

2,

3,

4,

5} , Henning Osholm Sørensen _{6,

7,

8,

9,

10} , Stefan Bruns _{6,

7,

8,

9,

10} , Yi Zheng _{11,

12,

13,

14} , Nathalie Tufenkji _{1,

2,

3,

4}

Affiliation

Self-assembly of graphene oxide (GO) nanosheets into porous 3D sponges is a promising approach to exploit their capacity to adsorb contaminants while facilitating the recovery of the nanosheets from treated water. Yet, forming mechanically robust sponges with suitable adsorption properties presents a significant challenge. Ultra-strong and highly porous 3D sponges are formed using GO, vitamin C (VC), and cellulose nanocrystals (CNCs) – natural nanorods isolated from wood pulp. CNCs provide a robust scaffold for the partially reduced GO (rGO) nanosheets resulting in an exceptionally stiff nanohybrid. The concentration of VC as a reducing agent plays a critical role in tailoring the pore architecture of the sponges. By using excess amounts of VC, a unique hierarchical pore structure is achieved, where VC grains act as soft templates for forming millimeter-sized pores, the walls of which are also porous and comprised of micron-sized pores. The unique hierarchical pore structure ensures the interconnectivity of pores even at the core of large sponges as evidenced by micro and nano X-ray computed tomography. The unique pore architecture translates into an exceptional specific surface area for adsorption of a wide range of contaminants, such as dyes, heavy metals, pharmaceuticals and cyanotoxin from water.

中文翻译：

分层多孔，超强还原性氧化石墨烯纤维素纳米晶体海绵，可出色地吸附水污染物†

将氧化石墨烯（GO）纳米片自组装为多孔3D海绵是一种有前途的方法，可利用其吸附污染物的能力，同时促进从处理过的水中回收纳米片。然而，形成具有合适的吸附性能的机械坚固的海绵提出了巨大的挑战。超强和高度多孔的3D海绵是使用GO，维生素C（VC）和纤维素纳米晶体（CNC）–从木浆中分离出来的天然纳米棒形成的。CNC为部分还原的GO（rGO）纳米片提供了坚固的支架，从而产生了异常坚硬的纳米混合体。VC作为还原剂的浓度在调整海绵的孔结构中起着至关重要的作用。通过使用过量的VC，可以获得独特的分层孔结构，其中VC颗粒充当形成毫米大小的孔的软模板，其壁也是多孔的，并且由微米大小的孔组成。独特的分层孔结构可确保孔的互连性，即使在大型海绵的核心也是如此，这是通过微米和纳米X射线计算机断层扫描技术证明的。独特的孔结构可转化为出色的比表面积，可吸附多种污染物，例如染料，重金属，药物和水中的氰毒素。

更新日期：2018-03-26

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