农业环境科学学报
農業環境科學學報
농업배경과학학보
Journal of Agro-Environment Science
2014年
6期
1131-1138
,共8页
李彬%孟昭福%王建涛%马麟莉%许绍娥%杨淑英
李彬%孟昭福%王建濤%馬麟莉%許紹娥%楊淑英
리빈%맹소복%왕건도%마린리%허소아%양숙영
复配修饰%苯酚%两性-阳离子表面修饰剂%膨润土%吸附
複配脩飾%苯酚%兩性-暘離子錶麵脩飾劑%膨潤土%吸附
복배수식%분분%량성-양리자표면수식제%팽윤토%흡부
combined modification%phenol%amphoteric-cationic modifier%bentonite%adsorption
采用两性表面修饰剂十二烷基二甲基甜菜碱(BS-12)和阳离子表面修饰剂十六烷基三甲基溴化铵(CTMAB)复配修饰膨润土,通过批处理法研究了不同修饰比例、温度、pH和离子强度等条件下,复配修饰膨润土对苯酚的吸附规律和热力学特征,并探讨了其吸附机制。结果表明,CTMAB复配修饰显著增强了两性修饰膨润土对苯酚的吸附能力,30℃时吸附量呈现100BS+100CT(100%BS-12+100%CTMAB)>100BS+50CT(100%BS-12+50%CTMAB)>50BS+100CT(50%BS-12+100%CTMAB)>100BS+150CT(100%BS-12+150%CTMAB)>50BS+50CT(50%BS-12+50%CTMAB)>100BS+25CT(100%BS-12+25%CTMAB)>50BS+150CT(50%BS-12+150%CTMAB)>50BS+25CT(50%BS-12+25%CTMAB)>100BS(100%BS-12)>50BS(50%BS-12)>CK(原土)的顺序。当CTMAB复配修饰比例在0~100%CEC时,两性复配修饰土样对苯酚的吸附量随着修饰比例的增大而升高,而在100%~150%CEC阶段,吸附量则随CTMAB修饰比例的增大有所降低;修饰土样对苯酚吸附量随着温度、pH的升高而降低,在低浓度范围内,随着离子强度的增大而升高。Henry模型适用于描述苯酚在供试土样的吸附,供试土样对苯酚的吸附属于自发的物理吸附过程,吸附呈现焓减、熵增特征。
採用兩性錶麵脩飾劑十二烷基二甲基甜菜堿(BS-12)和暘離子錶麵脩飾劑十六烷基三甲基溴化銨(CTMAB)複配脩飾膨潤土,通過批處理法研究瞭不同脩飾比例、溫度、pH和離子彊度等條件下,複配脩飾膨潤土對苯酚的吸附規律和熱力學特徵,併探討瞭其吸附機製。結果錶明,CTMAB複配脩飾顯著增彊瞭兩性脩飾膨潤土對苯酚的吸附能力,30℃時吸附量呈現100BS+100CT(100%BS-12+100%CTMAB)>100BS+50CT(100%BS-12+50%CTMAB)>50BS+100CT(50%BS-12+100%CTMAB)>100BS+150CT(100%BS-12+150%CTMAB)>50BS+50CT(50%BS-12+50%CTMAB)>100BS+25CT(100%BS-12+25%CTMAB)>50BS+150CT(50%BS-12+150%CTMAB)>50BS+25CT(50%BS-12+25%CTMAB)>100BS(100%BS-12)>50BS(50%BS-12)>CK(原土)的順序。噹CTMAB複配脩飾比例在0~100%CEC時,兩性複配脩飾土樣對苯酚的吸附量隨著脩飾比例的增大而升高,而在100%~150%CEC階段,吸附量則隨CTMAB脩飾比例的增大有所降低;脩飾土樣對苯酚吸附量隨著溫度、pH的升高而降低,在低濃度範圍內,隨著離子彊度的增大而升高。Henry模型適用于描述苯酚在供試土樣的吸附,供試土樣對苯酚的吸附屬于自髮的物理吸附過程,吸附呈現焓減、熵增特徵。
채용량성표면수식제십이완기이갑기첨채감(BS-12)화양리자표면수식제십륙완기삼갑기추화안(CTMAB)복배수식팽윤토,통과비처리법연구료불동수식비례、온도、pH화리자강도등조건하,복배수식팽윤토대분분적흡부규률화열역학특정,병탐토료기흡부궤제。결과표명,CTMAB복배수식현저증강료량성수식팽윤토대분분적흡부능력,30℃시흡부량정현100BS+100CT(100%BS-12+100%CTMAB)>100BS+50CT(100%BS-12+50%CTMAB)>50BS+100CT(50%BS-12+100%CTMAB)>100BS+150CT(100%BS-12+150%CTMAB)>50BS+50CT(50%BS-12+50%CTMAB)>100BS+25CT(100%BS-12+25%CTMAB)>50BS+150CT(50%BS-12+150%CTMAB)>50BS+25CT(50%BS-12+25%CTMAB)>100BS(100%BS-12)>50BS(50%BS-12)>CK(원토)적순서。당CTMAB복배수식비례재0~100%CEC시,량성복배수식토양대분분적흡부량수착수식비례적증대이승고,이재100%~150%CEC계단,흡부량칙수CTMAB수식비례적증대유소강저;수식토양대분분흡부량수착온도、pH적승고이강저,재저농도범위내,수착리자강도적증대이승고。Henry모형괄용우묘술분분재공시토양적흡부,공시토양대분분적흡부속우자발적물리흡부과정,흡부정현함감、적증특정。
Modified bentonites have been used as an adsorbent for environmental remediation. An experiment was designed to examine the adsorption of phenol on bentonites modified by a mixture of amphoteric modifier, dodecyl dimethyl betaine(BS-12), and cationic modifier, hexadecyltrimethylammonium bromide(CTMAB)as influenced by modifier ratios, ionic strength, temperature and pH. Adsorption capacity of phenol on bentonites was in order of 100BS+100CT(100%BS-12+100%CTMAB)>100BS+50CT(100%BS-12+50%CTMAB)>50BS+100CT(50%BS-12+100%CTMAB)>100BS+150CT(100%BS-12+150%CTMAB)>50BS+50CT(50%BS-12+50%CTMAB)>100BS+25CT (100%BS-12+25%CTMAB)>50BS+150CT(50%BS-12+150%CTMAB)>50BS+25CT(50%BS-12+25%CTMAB)>100BS(100%BS-12)>50BS(50%BS-12)>CK(unmodified soil). This revealed that the adsorption of phenol on modified bentonites increased with increasing CTMAB ratios at 0~100%of CEC, while decreased slightly at CTMAB ratios greater than 100%of CEC. The phenol adsorption was reduced by elevated temperature and pH, but increased with ionic strength at low concentration ranges. Henry equation could best describe the phe-nol isotherms. The adsorption of phenol on amphoteric-cationic modified bentonites is a spontaneous physical adsorption process character-istized by both enthalpy decreases and entropy increases.