从不同地区直链烷基苯磺酸钠(linear sodium alkylbenzenesulfonate,简称LAS)富集地带取回的污水样中分离纯化得到一株能高效降解直链烷基苯磺酸钠的菌株——可动苯基杆菌(phenylobaterium mobil GZ6)。该菌细胞为短杆状,大小为(0.5～0...从不同地区直链烷基苯磺酸钠(linear sodium alkylbenzenesulfonate,简称LAS)富集地带取回的污水样中分离纯化得到一株能高效降解直链烷基苯磺酸钠的菌株——可动苯基杆菌(phenylobaterium mobil GZ6)。该菌细胞为短杆状,大小为(0.5～0.8)μm×(1.0～2.0)μm,其生长pH为6.0～10.0,最适生长pH为7.0,生长温度为4～40℃,最适生长温度为28℃。本实验用温度为28℃,转速为170r/min的振荡摇床培养GZ6菌,并实时监测其对LAS的降解情况。由紫外分析图发现,在GZ6对LAS降解的第8h,出现吸光度变化的最大值点,取第8h的样品用HPLC法分离,并用MS法进一步佐证紫外吸收的分析结果,探讨了GZ6菌对LAS的降解机理。展开更多
A IAS degradation strain with high resistance, which could take linear alkylbenzene sulphonate （LAS） as only carton origin for growth, was isolated from the drain canal of Hangao Detergent Plant of Xuzhou. The chara...A IAS degradation strain with high resistance, which could take linear alkylbenzene sulphonate （LAS） as only carton origin for growth, was isolated from the drain canal of Hangao Detergent Plant of Xuzhou. The characteristic of its degradation was researched and the results showed that the optimum conditions of this strain for degrading LAS were 30℃, pH 6.0, 150 ml solution in 500 ml triangle vase, 120 r/min, LAS concentration of 200 - 600 mg/L. The growth amount of the bacteria were up to 0. 443 （ OD400 ） and the degrading rate was up to 89.4%. The ability of the bacterium to degrade LAS could be as high as concentration of 1 200 mg/L.展开更多
The effectiveness of using acoustical （sonochemical） reactor for degradation of linear alkylbenzen sulfonate （LAS） from aqueous solution was investigated. LASs are anionic surfactants, found in relatively high amo...The effectiveness of using acoustical （sonochemical） reactor for degradation of linear alkylbenzen sulfonate （LAS） from aqueous solution was investigated. LASs are anionic surfactants, found in relatively high amounts in domestic and industrial wastewaters. In this study, experiments on LAS solution were performed using methylene blue active substances （MBAS） method. The effectiveness of acoustical processor reactor for LAS degradation is evaluated with emphasis on the effect of treatment time and initial LAS concentration. Experiments were performed at initial concentrations of 0.2, 0.5, 0.8 and 1.0 mg/L, acoustic frequency of 130 kHz, applied power of 500 W and temperature of 18℃-20℃. At the conditions involved, LAS degradation was found to increase with increasing sonochemical time. In addition, as the concentration increased, the LAS degradation rate decreased in the acoustical processor reactor.展开更多
High performance liquid chromatography (HPLC) has the advantages of rapid analysis and high sensitivity. In the present study a suitable analytical condition has been established for HPLC, and the LAS in modern sedime...High performance liquid chromatography (HPLC) has the advantages of rapid analysis and high sensitivity. In the present study a suitable analytical condition has been established for HPLC, and the LAS in modern sediments from core Zhu-9 at the Pearl River mouth has been determined by HPLC. The concentrations of C12-LAS homologues are the highest. The sedimentation flux of C12-LAS was correlated with the average flow of the Xijiang and Beijiang rivers: the higher the flow rate, the larger the C12-LAS sedimentation flux. This shows that the more rapidly the river flows, the shorter the LAS will stay in freshwater, the less the extent of biodegradation, the larger the C12-LAS sedimentation flux in the core Zhu-9.展开更多
Alizarin,extracted from rubia cordifolia,is a green natural dye.However,its application has been limited by its poor water solubility and pH sensitivity.In this study,linear sulfonic anionic surfactant(LAS)had been st...Alizarin,extracted from rubia cordifolia,is a green natural dye.However,its application has been limited by its poor water solubility and pH sensitivity.In this study,linear sulfonic anionic surfactant(LAS)had been studied as a new dispersant,which promoted the dyeing of alizarin on fabrics under mild conditions.Ultraviolet visible(UV-vis)spectra and Fourier transform infrared(FTIR)spectra confirmed appropriate bonding between alizarin and LAS,and the nano particle size analysis showed that LAS could promote the dispersion of alizarin in aqueous solution.Under the optimized condition of alizarin 4.8%on mass of fabric(omf)and LAS solution 2×10^(-2)mol/L,the fabrics were dyed with alizarin at room temperature and pH neutral conditions.The dyed fabrics had good washing fastness and ironing fastness.展开更多
文摘从不同地区直链烷基苯磺酸钠(linear sodium alkylbenzenesulfonate,简称LAS)富集地带取回的污水样中分离纯化得到一株能高效降解直链烷基苯磺酸钠的菌株——可动苯基杆菌(phenylobaterium mobil GZ6)。该菌细胞为短杆状,大小为(0.5～0.8)μm×(1.0～2.0)μm,其生长pH为6.0～10.0,最适生长pH为7.0,生长温度为4～40℃,最适生长温度为28℃。本实验用温度为28℃,转速为170r/min的振荡摇床培养GZ6菌,并实时监测其对LAS的降解情况。由紫外分析图发现,在GZ6对LAS降解的第8h,出现吸光度变化的最大值点,取第8h的样品用HPLC法分离,并用MS法进一步佐证紫外吸收的分析结果,探讨了GZ6菌对LAS的降解机理。
基金Supported by the Natural Science Foundation of Xuzhou City(X2004424-1)~~
文摘A IAS degradation strain with high resistance, which could take linear alkylbenzene sulphonate （LAS） as only carton origin for growth, was isolated from the drain canal of Hangao Detergent Plant of Xuzhou. The characteristic of its degradation was researched and the results showed that the optimum conditions of this strain for degrading LAS were 30℃, pH 6.0, 150 ml solution in 500 ml triangle vase, 120 r/min, LAS concentration of 200 - 600 mg/L. The growth amount of the bacteria were up to 0. 443 （ OD400 ） and the degrading rate was up to 89.4%. The ability of the bacterium to degrade LAS could be as high as concentration of 1 200 mg/L.
基金Project (No. 85-01-46-3401) supported by the Medical Sciences/ University of Tehran, I.R. Iran
文摘The effectiveness of using acoustical （sonochemical） reactor for degradation of linear alkylbenzen sulfonate （LAS） from aqueous solution was investigated. LASs are anionic surfactants, found in relatively high amounts in domestic and industrial wastewaters. In this study, experiments on LAS solution were performed using methylene blue active substances （MBAS） method. The effectiveness of acoustical processor reactor for LAS degradation is evaluated with emphasis on the effect of treatment time and initial LAS concentration. Experiments were performed at initial concentrations of 0.2, 0.5, 0.8 and 1.0 mg/L, acoustic frequency of 130 kHz, applied power of 500 W and temperature of 18℃-20℃. At the conditions involved, LAS degradation was found to increase with increasing sonochemical time. In addition, as the concentration increased, the LAS degradation rate decreased in the acoustical processor reactor.
文摘High performance liquid chromatography (HPLC) has the advantages of rapid analysis and high sensitivity. In the present study a suitable analytical condition has been established for HPLC, and the LAS in modern sediments from core Zhu-9 at the Pearl River mouth has been determined by HPLC. The concentrations of C12-LAS homologues are the highest. The sedimentation flux of C12-LAS was correlated with the average flow of the Xijiang and Beijiang rivers: the higher the flow rate, the larger the C12-LAS sedimentation flux. This shows that the more rapidly the river flows, the shorter the LAS will stay in freshwater, the less the extent of biodegradation, the larger the C12-LAS sedimentation flux in the core Zhu-9.
基金National Key Research&Development Program of China(No.2017YFB0309100)。
文摘Alizarin,extracted from rubia cordifolia,is a green natural dye.However,its application has been limited by its poor water solubility and pH sensitivity.In this study,linear sulfonic anionic surfactant(LAS)had been studied as a new dispersant,which promoted the dyeing of alizarin on fabrics under mild conditions.Ultraviolet visible(UV-vis)spectra and Fourier transform infrared(FTIR)spectra confirmed appropriate bonding between alizarin and LAS,and the nano particle size analysis showed that LAS could promote the dispersion of alizarin in aqueous solution.Under the optimized condition of alizarin 4.8%on mass of fabric(omf)and LAS solution 2×10^(-2)mol/L,the fabrics were dyed with alizarin at room temperature and pH neutral conditions.The dyed fabrics had good washing fastness and ironing fastness.
