CAJ | 학술논문

在还原剂 NaBH4存在下，采用对氨基苯磺酸重氮盐与氧化石墨(GO)表面共价键合制备磺化石墨烯(GP-SO3 H).傅里叶变换红外光谱(FTIR)证明磺酸基团在石墨烯表面接枝.采用扫描电子显微镜(SEM)研究了磺化石墨烯的表面形貌.以磺化石墨烯为添加剂，制备了磺化石墨烯/活性炭(GP-SO3 H/ AC)复合电极.循环伏安及阻抗分析结果表明，该复合电极的电容特性及导电性有明显改善.以活性炭电极为对电极组装了不对称电容器(GP-SO3 H/ AC| AC)，研究了该不对称电容器的电化学脱盐性能.与对称电容器(AC | AC)相比，不对称电容器中由于电极内磺酸基团对反离子的屏蔽作用，电容器的电流效率达到89.4%以上，脱盐量提高2.4倍，单个循环脱盐量达到10.87 mg/ g.
재환원제 NaBH4존재하，채용대안기분광산중담염여양화석묵(GO)표면공개건합제비광화석묵희(GP-SO3 H).부리협변환홍외광보(FTIR)증명광산기단재석묵희표면접지.채용소묘전자현미경(SEM)연구료광화석묵희적표면형모.이광화석묵희위첨가제，제비료광화석묵희/활성탄(GP-SO3 H/ AC)복합전겁.순배복안급조항분석결과표명，해복합전겁적전용특성급도전성유명현개선.이활성탄전겁위대전겁조장료불대칭전용기(GP-SO3 H/ AC| AC)，연구료해불대칭전용기적전화학탈염성능.여대칭전용기(AC | AC)상비，불대칭전용기중유우전겁내광산기단대반리자적병폐작용，전용기적전류효솔체도89.4%이상，탈염량제고2.4배，단개순배탈염량체도10.87 mg/ g.
Sulfonated graphene( GP-SO3 H) was prepared by grafting reaction of sulfonated diazoniun salt. The sulfonated graphene was characterized by Fourier transform infrared spectrometry( FTIR) and scanning electron microscopy(SEM), respectively. The experimental results indicate that the sulfonic groups have been grafted onto graphene oxide. The sulfonated graphene / activated carbon composite electrode(GP-SO3 H/ AC) was prepared by mixing 10% ( mass fraction) GP-SO3 H as dopant. Compared with AC electrode, this composite electrode exhibits an ideal double layer capacitive behavior and high conductivity, confirmed by cyclic voltammetry and electrochemical impedance spectroscopy. The hybrid capacitor was assembled by the resultant GP-SO3 H/ AC as negative electrode and AC as counter electrode for capacitor deionization(CDI). Under the constant current charging-discharging condition, the salt removal amount of 10. 87 mg / g in single cycle was obtained, about 2. 4 times that of the normal AC capacitor. And the current efficiency was improved dramatically owing to the facile adsorption of sulfonic groups to cations, and the shielding effect of sulfonic groups on the counter-ions. The asymmetric capacitor is expected to be used for actual application in brackish water desalination.