腐植酸及pH对生物炭-铁锰氧化物复合材料吸附As(Ⅲ)的影响机理  

Effect of humic acid and pH on the adsorption of arsenic(Ⅲ) on biochar-ferro manganese oxide composite material

作　　者：林丽娜[1,2] 黄青[1,2] 廉菲[1] 刘仲齐[1] 宋正国[1] 

机构地区：[1]农业部环境保护科研监测所,天津300191 [2]沈阳农业大学土地与环境学院,沈阳110000

出　　处：《农业环境科学学报》2017年第2期387-393,共7页Journal of Agro-Environment Science

基　　金：国家自然科学基金项目(41273136);天津市应用基础与前沿技术研究计划项目(15JCZDJC33900)~~

摘　　要：采用振荡平衡法,研究不同用量和不同添加顺序的腐植酸(Humic acid,HA)对生物炭-铁锰氧化物复合材料(F1M4BC25)吸附As(Ⅲ)性能的影响及其机理。结果表明:添加不同浓度的HA对F1M4BC25吸附As(Ⅲ)的性能存在明显差异,与未添加HA相比,添加5 mg·L^(-1)的HA时最大吸附容量(Qm)为8.39 mg·g-1,增加了5.00%;添加10、50 mg·L^(-1)的HA时,Qm分别为7.59、5.25 mg·g-1,分别降低了5.00%和34.3%。不同HA添加顺序对F1M4BC25吸附As(Ⅲ)的性能有较大影响,Qm顺序为:后添加HA(5.82 mg·g-1)>同时添加(5.20 mg·g-1)>先添加HA(3.30 mg·g-1)。在初始pH=3时,F1M4BC25对As(Ⅲ)吸附能力高于pH=6时。两种pH条件下吸附平衡后溶液的pH值均增大,初始pH=3时增幅大于初始pH=6时;两种pH条件下DOC浓度大小顺序均为:后添加HA>同时添加>先添加HA。研究表明,低浓度HA以及弱酸性条件有利于F1M4BC25对水体中As(Ⅲ)的去除,高浓度HA能够与As(Ⅲ)产生竞争吸附。The sorption batch experiments were conducted to investigate the effect of humic acid（HA）on the adsorption of arsenic（Ⅲ）on biochar-ferro manganese oxide composite material（F1M4BC25）. The results showed that the adsorption capacity of F1M4BC25 for arsenic（Ⅲ）was affected by the concentration of HA. Compared with no HA, the adsorption capacity of arsenic（Ⅲ）on the F1M4BC25 increased by 5.00%in the presence of 5 mg·L^（-1）of HA. The adsorption capacity of adsorption decreased by 5.00% and 34.3% when 10 and 50 mg·L^（-1）of HA was added, respectively. The adding order of arsenic（Ⅲ）and HA also affected the adsorption capacity of arsenic（Ⅲ）on F1M4BC25 that initial addition of arsenic（Ⅲ）（Qm=5.82 mg·g-1）simultaneous addition（Qm=5.20 mg·g-1）initial addition of HA（Qm=3.30 mg·g-1）. The capacity of arsenic（Ⅲ）on F1M4BC25 under pH=3 was higher than that under pH=6. The concentration of DOC in solution followed the sequence of late addition of HA simultaneous additioninitial addition under either pH 3 or 6. The research also showed that high concentration of HA could compete with arsenic（Ⅲ）to reduce the arsenic（Ⅲ）on F1M4BC25, but the low concentration of HA and weak acid conditions were favorable for the removal of arsenic（Ⅲ）from solution by F1M4BC25.

关 键 词：腐植酸 生物炭-铁锰氧化物 As(Ⅲ) 

分 类 号：X52[环境科学与工程—环境工程]