CAJ | 학술논문

以3-氨丙基三乙氧基硅烷(AMPTS)修饰氧化石墨(GO)还原合成氨基功能化石墨烯(GP-NH2).傅里叶变换红外(FTIR)光谱和X射线能谱(EDX)分析证明了氨基基团的成功接枝.以GP-NH2为添加剂,制备胺化石墨烯/活性炭(GP-NH2/AC)复合电极,并以GP-NH2/AC为正极, AC电极为对电极,组装不对称电容器(AC||GP-NH2/AC)用于电容脱盐.实验表明, AC||GP-NH2/AC单循环脱盐量为7.63 mg?g-1,电流效率达77.6%.利用磺酸重氮盐接枝石墨烯制备磺化石墨烯(GP-SO3H)及磺化石墨烯/活性炭(GP-SO3H/AC)复合电极.并以GP-SO3H/AC为负极, GP-NH2/AC为正极,组装不对称电容器(GP-SO3H/AC||GP-NH2/AC)用于电容脱盐,其平均脱盐速率可达0.99 mg?g-1?min-1,比纯AC电极提高了接近5倍.充放电速率提高了30%；而且由于正、负极表面固有电荷的存在,大大降低了反离子效应,电流效率由40%(纯AC||AC对称电容器)提高到92.8%.表明电极内功能化导电石墨烯的存在既提高了导电性,又兼具离子选择性的作用,从而明显改善电极的脱盐性能.
이3-안병기삼을양기규완(AMPTS)수식양화석묵(GO)환원합성안기공능화석묵희(GP-NH2).부리협변환홍외(FTIR)광보화X사선능보(EDX)분석증명료안기기단적성공접지.이GP-NH2위첨가제,제비알화석묵희/활성탄(GP-NH2/AC)복합전겁,병이GP-NH2/AC위정겁, AC전겁위대전겁,조장불대칭전용기(AC||GP-NH2/AC)용우전용탈염.실험표명, AC||GP-NH2/AC단순배탈염량위7.63 mg?g-1,전류효솔체77.6%.이용광산중담염접지석묵희제비광화석묵희(GP-SO3H)급광화석묵희/활성탄(GP-SO3H/AC)복합전겁.병이GP-SO3H/AC위부겁, GP-NH2/AC위정겁,조장불대칭전용기(GP-SO3H/AC||GP-NH2/AC)용우전용탈염,기평균탈염속솔가체0.99 mg?g-1?min-1,비순AC전겁제고료접근5배.충방전속솔제고료30%；이차유우정、부겁표면고유전하적존재,대대강저료반리자효응,전류효솔유40%(순AC||AC대칭전용기)제고도92.8%.표명전겁내공능화도전석묵희적존재기제고료도전성,우겸구리자선택성적작용,종이명현개선전겁적탈염성능.
Aminated graphene (GP-NH2) was fabricated via the modification of graphite oxide (GO) with 3-aminopropyltriethoxysilane (AMPTS), and the covalent grafting of the amine functional groups was confirmed using Fourier transform infrared (FTIR) spectroscopy and energy-dispersive X-ray (EDX) spectroscopy. The aminated graphene (GP-NH2)/activated carbon (AC) composite electrode (GP-NH2/AC) was prepared, using the GP-NH2 as an additive. An AC||GP-NH2/AC asymmetric capacitor for capacitor deionization was then assembled using the GP-NH2/AC electrode as the positive electrode and AC as the negative electrode. A salt removal of 7.63 mg?g-1 was achieved using the AC||GP-NH2/AC capacitor, and current efficiency was increased to 77.6%. A GP-SO3H/AC electrode was then prepared by mixing AC with sulfonated GP. With GP-NH2/AC as the positive electrode, and GP-SO3H/AC as the negative electrode, a GP-SO3H/AC||GP-NH2/AC asymmetric capacitor was assembled for capacitive deionization. An average desalting rate of 0.99 mg?g-1?min-1 was achieved, almost five times higher than that achieved using an AC||AC symmetric capacitor. The charge-discharge rate showed a 30%increase. The existence of the intrinsic charge on the electrode surface greatly inhibited the migration of counter ions, so that the current efficiency was significantly enhanced (to 92.8%) in comparison with the value achieved using an AC||AC capacitor (40%). These results demonstrated that the functionalized graphene in the AC electrode not only enhanced the conductivity, but also control ed the selective adsorption of ions, thereby significantly improving the deionization performance.