Influences of pH, heavy metals and phosphate and their co-influences on the sorption of pentachlorophenol on cyanobacterial biomass.
Influences of pH, heavy metals and phosphate and their co-influences on the sorption of pentachlorophenol on cyanobacterial biomass.
复制标题
DOI：
10.1016/j.watres.2012.04.003
复制
发表时间：
2012-07
期刊：
影响因子：
12.8
通讯作者：
Yuqiang Tao;B. Xue;Ji-cheng Zhong;Shu-chun Yao;Qinglong L. Wu
中科院分区：
文献类型：
--
作者：
Yuqiang Tao;B. Xue;Ji-cheng Zhong;Shu-chun Yao;Qinglong L. Wu
研究了pH、两种过渡金属离子（Cu 2+、Cd 2+）、Na 3 PO 4及其协同作用对蓝藻生物质吸附五氯酚（PCP）的影响。pH值在3.25-9.00范围内，五氯苯酚的吸附量显著降低。尽管离子化五氯苯酚的吸附系数比中性物质的吸附系数低8.51倍，但在环境相关pH值下，离子化五氯苯酚是主要的吸附物质，对五氯苯酚的总吸附量贡献更大。在低浓度Cu 2+（≤40 μmol L−1）条件下，五氯酚的吸附量远低于空白。当Cu 2+浓度大于50 μmol L-1时，其浓度超过空白对照。与单一pH影响相比，共存Cu ~（2+）在pH为3.25和4.35时抑制PCP的吸附，在pH为5.00 ~ 9.00时促进PCP的吸附。在Cd ~（2+）存在下，PCP的吸附量先增加后迅速下降，最后又略有增加。除pH值为9.00时外，Cd ~（2+）存在下，其它pH值条件下PCP的吸附量均远低于单独受pH值影响的吸附量。在Na_3PO_4和pH共同作用下，在pH 3.25 ~ 5.00范围内，五氯酚的吸附量低于单独受pH影响的吸附量，在pH 5.00-9.00范围内，五氯酚的吸附量随pH的增加而增加，在pH 6.00 ~ 9.00范围内，五氯酚的吸附量高于单独受pH影响的吸附量。五氯苯酚-金属离子对促进了五氯苯酚的吸附，紫外可见光谱和红外光谱表明，这在很大程度上取决于pH值。金属和五氯酚的形态及五氯酚-金属离子对的稳定常数对吸附有较大影响。离子强度对五氯酚的吸附也有重要影响。
Influences of pH, two types of ions of transition metals (Cu2+, Cd2+), Na3PO4and their co-influences on the sorption of pentachlorophenol (PCP) on cyanobacterial biomass derived from natural bloom were studied. Sorption of PCP significantly decreases with pH in the range of 3.25–9.00. Although sorption coefficient of ionized PCP is 8.51 times lower than that of neutral species, it is the dominant species at environmentally relevant pH and contributes more to the total sorption of PCP. In the presence of low concentration of Cu2+(≤40 μmol L−1), sorption of PCP was much lower than that of the blank. However, it increased gradually with Cu2+, and overpassed the blank when concentration of Cu2+was higher than 50 μmol L−1. Compared with the sole influence of pH, coexisted Cu2+inhibited the sorption of PCP at pH of 3.25 and 4.35, but enhanced it in the pH range of 5.00–9.00. In the presence of Cd2+, sorption of PCP first increased then decreased rapidly and finally increased slightly again with Cd2+. Except for at pH of 9.00, sorption of PCP at other pH in the presence of Cd2+was much lower than that solely affected by pH. In the presence of Na3PO4, sorption of PCP increased rapidly then maintained with Na3PO4. Under the influence of both Na3PO4and pH, sorption of PCP at pH from 3.25 to 5.00 was lower than that solely affected by pH, while it increased with pH in the range of 5.00–9.00 and was higher than that solely affected by pH in the range of 6.00–9.00. Ion pairs of pentachlorophenolate-metal facilitated the sorption of PCP, which was largely dependent on pH illustrated by UV–visible and FTIR spectra. Speciations of metals and PCP and the stability constants of ion pairs of pentachlorophenolate-metal greatly affected the sorption. Ionic strength also played an important role for the sorption of PCP.