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王连生, Xiaodong Wang, Yuying Dong, Liansheng Wang *, Shuokui Han
Chemosphere 44(2001)447-55,-0001,():
-1年11月30日
Acute 12h and 24h lethal toxicity (12h-LC50 and 24h-LC50) of 31 substituted phenols to Rana japonica tadpoles was determined. Results indicate that toxicity of phenols to tadpoles varied only slightly with length of exposure and the 12-h test could serve as surrogate of the 24-h test. A mechanism-based quantitative structure-activity relationship (QSAR) method was employed and 1-octanol/water partition coefficient (log Kow)-dependent models were developed to study different modes of toxic action. Most phenols elicited their response via a polar narcotic mechanism and an excellent log Kow-dependent model was obtained. Soft electrophilicity and pro-electrophilicity were observed for some phenols and a good log Kow-dependent model was also achieved. Additionally, the significant dissociation of carboxyl on benzoic acid derivatives sharply reduced their toxicity. A statistically robust QSAR model was developed for all studied compounds with the combined application of log Kow, energy of lowest unoccupied orbital (Elumo), heat of formation (HOF) and the first-order path molecular connectivity dices (1Xp).
Phenols, Acute toxicity, Rana japonica tadpoles, QSAR, Mechanism of action
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王连生, Chunsheng Yin a, *, Xinhui Liu a, Weimin Guo b, Teng Lin a, Xiaodong Wang a, Liansheng Wang a
Water Research 36(2002)2975-2982,-0001,():
-1年11月30日
Quantitative structure-property relationships (QSPR) were developed using a genetic algorithm (GA)-based variable-selection approach with quantum chemical descriptors derived from AM1-based calculations (MOPAC7.0). With the QSPR models, the aqueous solubility of 71 aromatic sulfur-containing carboxylates, including phenylthio, and phenylsulfonyl carboxylates were efficiently estimated and predicted. Using GA-based multivariate linear regression (MLR) with cross-validation procedure, the most important descriptors were selected from a pool of 28 quantum chemical semi-empirical descriptors, including steric and electronic types, to build QSPR models. The molecular descriptors included molecular surface
Aqueous solubility, Quantum chemical semi-empirical des, c, r, i, p, t, ors, Sulfur-containing carboxylates, Genetic algorithm, Stepwise regression, Multiple linear regression
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【期刊论文】Polychlorinated organic compounds in Yangtse River sediments
王连生, Shifen Xu a, *, Xin Jiang a, Yuying Dong a, Cheng Sun a, Jianfang Feng a, Liansheng Wang a, D. Martens b, Bernd M. Gawlik c
Chemosphere 41(2000)1897-1903,-0001,():
-1年11月30日
Polychlorinated organic compounds (PCOCs) were analyzed in Yangtse River sediments. The results show that the concentrations of PCOCs in Yangtse River sediments followed the order of DDTs >HCB>HCHs >PCBs. High PCOCs concentrations were detected in sediments from station Y02a and Y02b, which are located in the main input of the Yangtse River (Nanjing section). Results also show that the PCOCs values were highly correlated with organic carbon content and heavy metal contamination.
Yangtse river, PCOCs, Sediment, Contamination, Organochlorine compounds
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【期刊论文】PHOTOSONOCHEMICAL DEGRADATION OF PHENOL IN WATER
王连生, CHUNDE WU*, XINHUI LIU, DONGBIN WEI, JINCHU FAN and LIANSHENG WANG
Wat. Res. Vol. 35, No.16, pp. 3927-3933, 2001,-0001,():
-1年11月30日
The combination of ultrasound (US) and photochemistry has been used to degrade an aqueous solution of phenol. It was considerably more effective than ultrasound or ultraviolet (UV) light alone. Based on the results of total organic carbon (TOC) removal, it was shown that the synergistic action of ultrasound and ultraviolet light existed. Identification of the first intermediates of the reaction (hydroquinone, catechol, benzoquinone and resorcin) indicates that OH radicals are involved in the photosonochemical degradation mechanisms. The effects of parameters such as pH, saturating gases, and Fe2+on the photosonochemical degradation have been studied. The experimental results have shown that lower pH and higher concentration of dissolved oxygen favor the phenol degradation and that the presence of Fe2+enhanced TOC removal of phenol solutions
ultrasound,, ultraviolet,, phenol,, water treatment,, fenton reaction
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【期刊论文】Photocatalytic degradation of AZO dyes by supported TiO2+UV in aqueous solution
王连生, Chunmei Zhu a, *, Liangyan Wang a, Linren Kong b, Xi Yang b, Liansheng Wang b, Shaojian Zheng a, Feili Chen a, Feng MaiZhi a, Huang Zong a
Chemosphere 41(2000)303-309,-0001,():
-1年11月30日
The photocatalytic degradation performance of photocatalysts TiO2 supported on 13-X, Na-Y, 4A zeolites with di erent loading content was evaluated using the photocatalytic oxidation of dyes direct fast scarlet 4BS and acid red 3B in aqueous medium. The results showed that the best reaction dosage of TiO2-zeolite catalysts is about 2g/l and the photocatalytic kinetics follows
TiO2, Zeolite, Photocatalytic degradation, Dye
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