Abstract Poor chlorine resistance shortens service life of polyamide (PA) reverse osmosis membrane. Here, nitrogen-doped graphene oxide quantum dots (N-GOQDs) were firstly applied to graft on PA membrane surface. Most grafting experiments are often accompanied by a decrease in water flux. In this study, the flux of the grafted membrane can be increased compared with commercial pristine membranes. Also, all modified membranes show better chlorine resistance than pristine ones. Specifically, N-GOQDs are integrated onto polyamide membranes through grafting method. Comprehensive regulation of chlorine resistance and desalination performance can be achieved by changing grafting conditions. For example, under the conditions of 12 h grafting time and 0.002 mg/mL of N-GOQD solution, water flux, NaCl rejection, and chlorine resistance of the modified membrane are improved by 11.1%, 2.3% and 32.8% after 280 h chlorine soaking respectively. FTIR analyses show that hydrogen bonded C O groups can be observed in the N-GOQD grafted membrane after chlorine tests, but they are destroyed and weakened in pristine membranes, which indicates that the modified membrane has better resistance to reactive chlorine.

中文翻译：

---

聚酰胺反渗透膜的化学接枝 N-GOQD 具有改进的耐氯性、水通量和 NaCl 截留率

摘要 聚酰胺（PA）反渗透膜的耐氯性差会缩短其使用寿命。在这里，氮掺杂氧化石墨烯量子点（N-GOQDs）首先被用于接枝到 PA 膜表面。大多数接枝实验通常伴随着水通量的降低。在这项研究中，与商业原始膜相比，接枝膜的通量可以增加。此外，所有改性膜都表现出比原始膜更好的耐氯性。具体而言，N-GOQDs 通过接枝方法集成到聚酰胺膜上。通过改变接枝条件可以实现耐氯性和脱盐性能的综合调节。例如，在 12 h 接枝时间和 0.002 mg/mL N-GOQD 溶液的条件下，水通量、NaCl 截留、经氯气浸泡280 h后，改性膜的耐氯性和耐氯性分别提高了11.1%、2.3%和32.8%。FTIR分析表明，经过氯试验后，在N-GOQD接枝膜中可以观察到氢键合的CO基团，但在原始膜中它们被破坏和削弱，这表明改性膜具有更好的抗活性氯的能力。