作者机构：
[Zeng R.] College of Chemistry and Materials Science, Hengyang Normal University, Hengyang, 421008, China;Key Laboratory of Functional Organometallic Materials of Hengyang Normal University, College of Hunan Province, Hengyang, 421008, China;[戴友芝] College of Chemical Engineering, Xiangtan University, Xiangtan, 411105, China;[冯泳兰; 刘梦琴; 张复兴; 彭刚] College of Chemistry and Materials Science, Hengyang Normal University, Hengyang, 421008, China, Key Laboratory of Functional Organometallic Materials of Hengyang Normal University, College of Hunan Province, Hengyang, 421008, China;[唐文清] College of Chemistry and Materials Science, Hengyang Normal University, Hengyang, 421008, China, Key Laboratory of Functional Organometallic Materials of Hengyang Normal University, College of Hunan Province, Hengyang, 421008, China, College of Chemical Engineering, Xiangtan University, Xiangtan, 411105, China
通讯机构：
[Zeng, R.] C;College of Chemistry and Materials Science, Hengyang Normal University, Hengyang, China
关键词：
烟秸杆;生物炭;吸附;动力学;热力学
摘要：
以农业废弃物烟秸杆为原料,以KH_2PO_4为活化剂,制备了烟秸杆生物碳(简称TSC_(500)),通过静态吸附实验研究了TSC_(500)对含Cr(Ⅵ)废水的吸附性能。采用比表面积分析仪对TSC_(500)进行了测试,实验考察了pH值、吸附剂用量、吸附时间、Cr(Ⅵ)初始浓度和温度对Cr(Ⅵ)吸附的影响,深入研究了TSC_(500)对Cr(Ⅵ)的吸附行为。结果表明,在pH=3、温度313 K条件下,0.2 g TSC_(500)吸附100 mg/L Cr(Ⅵ),去除率和吸附容量分别达到91.32% 和45.66 mg/g,Langmuir和Freundlich比Temkin等温模型更好地拟合吸附实验数据;准一级和准二级动力学模型均能较好地描述该吸附行为,相关系数高达0.99;计算得到热力学参数ΔG~θ、ΔH~θ和ΔS~θ值表明该吸附过程为自发吸热过程。
摘要：
为了解湘江(衡阳段)底泥重金属污染程度,对流域内10个断面18个采样点的表层底泥重金属(Cu、Zn、As、Hg、Cd、Cr、Pb)进行采样,测定样品各金属含量,并分别采用潜在生态危害指数法和地累积指数法评价底泥重金属潜在生态风险和污染程度.结果表明,湘江(衡阳段)表层底泥中各点重金属平均 RI 为1009．46,总体上属于很强生态风险；地累积指数表明在松柏段面的砷、汞、镉、铅处于严重污染.
摘要：
Hollow nanospheres of poly(m-toluidine), poly(o-toluidine), and poly(N-methylaniline) were successfully prepared in a solution of poly(methyl vinyl ether-alt-maleic acid) by using ammonium persulfate as the oxidant. The polymerization processes of methyl substituted aniline were monitored by recording pH and temperature changes of the reaction medium. The experimental results showed that the substitution position of methyl group affected the characteristics of formed hollow nanospheres. The formation mechanism of such hollow nanospheres was suggested. The produced hydrophobic oligomers self-assembled at the interface of water/droplet of monomers and acted as the soft template for the formation of hollow spheres.
摘要：
Bisphenol-A (BPA) is an emerging contaminant with severe toxic effects such as disrupting endocrine system or causing cancer, therefore, developing sensitive and selective sensor for bisphenol-A is very important and interesting. Herein, mesoporous hydroxyapatite (meso- HAP) and mesoporous titanium dioxide (meso-TiO2) have been synthesized and an electrochemical sensor for bisphenol-A was fabricated based on immobilizing meso-hydroxyapatite, meso-TiO2 and multi-walled carbon nanotubes (MWCNT) onto glassy carbon electrode (GCE) surface. Compared with bare electrode and single layer modified electrode, meso-HAP/meso-TiO2/MWCNT modified electrode not only significantly enhanced the oxidation peak current of bisphenol-A, but also lowered the oxidation overpotential, suggesting that the prepared sensor can remarkably improve the determining sensitivity of bisphenol-A. Factors influencing the detection processes were optimized and the kinetic parameters were also investigated. Under the optimized conditions, the oxidation peak current was proportional to bisphenol-A concentration in the range from 8.0 × 10-9-4.0 × 10-7 M with the correlation coefficient of 0.9979. The detection limit was 1.0 × 10-9 M (S/N = 3). The fabricated electrode showed good reproducibility, stability and antiinterference. The proposed method was successfully applied to determine bisphenol-A in plastic products and the results were satisfactory.
