应用化工
應用化工
응용화공
APPLIED CHEMICAL INDUSTRY
2014年
5期
880-882,886
,共4页
李扬%李梦耀%袁胜%郭印丽%钱会
李颺%李夢耀%袁勝%郭印麗%錢會
리양%리몽요%원성%곽인려%전회
五氯酚钠%黄土性土壤%吸附%解吸
五氯酚鈉%黃土性土壤%吸附%解吸
오록분납%황토성토양%흡부%해흡
sodium pentachlorophenol%loessial soil%adsorption%desorption
采用静态与动态两种方法,探究了淀积层黄土中五氯酚钠( PCP-Na)的吸附和解吸特性。结果表明, PCP-Na在淀积层黄土中的静态吸附平衡时间为2.5 h,吸附速率为21.4 mg/( kg·h),吸附量为53.6 mg/ kg。pH 4~7,对淀积层黄土中 PCP-Na 的吸附有影响,但影响不大;氯化钠浓度0~0.4 mol/ L,PCP-Na 的吸附量与离子强度呈正比。在实验温度下,吸附等温线均为 L-型。淀积层黄土中 PCP-Na 的动态吸附结果表明,当流出液体积大于750 mL 时,PCP-Na 在土柱内的吸附达到饱和;吸附饱和的土柱放置2 h 以后,用蒸馏水解吸,当解吸液流出体积超过800 mL 时,流出液中几乎无 PCP-Na。由此可见,淀积层黄土对水溶性 PCP-Na 的滞留能力较差,PCP-Na 可轻易穿过黄土,对地下水造成不可避免地污染。
採用靜態與動態兩種方法,探究瞭澱積層黃土中五氯酚鈉( PCP-Na)的吸附和解吸特性。結果錶明, PCP-Na在澱積層黃土中的靜態吸附平衡時間為2.5 h,吸附速率為21.4 mg/( kg·h),吸附量為53.6 mg/ kg。pH 4~7,對澱積層黃土中 PCP-Na 的吸附有影響,但影響不大;氯化鈉濃度0~0.4 mol/ L,PCP-Na 的吸附量與離子彊度呈正比。在實驗溫度下,吸附等溫線均為 L-型。澱積層黃土中 PCP-Na 的動態吸附結果錶明,噹流齣液體積大于750 mL 時,PCP-Na 在土柱內的吸附達到飽和;吸附飽和的土柱放置2 h 以後,用蒸餾水解吸,噹解吸液流齣體積超過800 mL 時,流齣液中幾乎無 PCP-Na。由此可見,澱積層黃土對水溶性 PCP-Na 的滯留能力較差,PCP-Na 可輕易穿過黃土,對地下水造成不可避免地汙染。
채용정태여동태량충방법,탐구료정적층황토중오록분납( PCP-Na)적흡부화해흡특성。결과표명, PCP-Na재정적층황토중적정태흡부평형시간위2.5 h,흡부속솔위21.4 mg/( kg·h),흡부량위53.6 mg/ kg。pH 4~7,대정적층황토중 PCP-Na 적흡부유영향,단영향불대;록화납농도0~0.4 mol/ L,PCP-Na 적흡부량여리자강도정정비。재실험온도하,흡부등온선균위 L-형。정적층황토중 PCP-Na 적동태흡부결과표명,당류출액체적대우750 mL 시,PCP-Na 재토주내적흡부체도포화;흡부포화적토주방치2 h 이후,용증류수해흡,당해흡액류출체적초과800 mL 시,류출액중궤호무 PCP-Na。유차가견,정적층황토대수용성 PCP-Na 적체류능력교차,PCP-Na 가경역천과황토,대지하수조성불가피면지오염。
The adsorption / desorption properties and laws of PCP-Na in the loess have been ascertained by combination of static and dynamic method. The results showed that static adsorption time of PCP-Na in the loess is 2. 5 h,the adsorption rate is 21. 4 mg /( kg · h)and the constant of adsorption quantity is 53. 6 mg / kg. The adsorption quantity of sodium pentachlorophenol in the loess could be affected by pH in the range of 4 ~ 7,but not obviously. The concentration of NaCl in 0 ~ 0. 4 mol/ L,adsorption quantity of PCP-Na increases with the increase of ionic strength. Under all test temperatures,adsorption isotherm types are based on L-type,respectively. The results of dynamic adsorption showed that the adsorption quantity of PCP-Na reached saturation in the soil column,when the effluent volumes were greater than 750 mL. The adsorption saturated soil column were placed for 2 h before desorbed by distilled water. When the volumes of desorption were more than 800 mL,there was almost no PCP-Na in effluent. The lo-ess soil has not a function for the enrichment of PCP-Na penetrates the loess soil easily. Inevitably,the groundwater will be contaminated by the PCP-Na.