Development of Hybrid Film Based on Carboxymethyl Chitosan-Gum Arabic Incorporated Citric Acid and Polyphenols from Cinnamomum camphora Seeds for Active Food Packaging

Journal of Polymers and the Environment - In this study, carboxymethyl chitosan with gum Arabic (CG) based novel functional films containing Cinnamomum camphora seeds extract (CCSE) at varying...     

Developing “precise-acting” strategies for improving anaerobic methanogenesis of organic waste: Insights from the electron transfer system of syntrophic partners

Methanogenesis is the last step in anaerobic digestion, which is usually a rate-limiting step in the biological treatment of organic waste. The low methanogenesis efficiency (low methane production rate, low methane yield, low methane content) substantially limits the development of anaerobic digestion technology. Traditional pretreatment methods and bio-stimulation strategies have impacts on the entire anaerobic system and cannot directly enhance methanogenesis in a targeted manner, which was defined as “broad-acting” strategies in this perspective. Further, we discussed our opinion of methanogenesis process with insights from the electron transfer system of syntrophic partners and provided potential targeted enhancing strategy for high-efficiency electron transfer system. These “precise-acting” strategies are expected to achieve an efficient methanogenesis process and enhance the bio-energy recovery of organic waste.     

Highly efficient photocatalytic oxidation of antibiotic ciprofloxacin using TiO2@g-C3N4@biochar composite

Environmental Science and Pollution Research - In this present study, a novel indirect Z-scheme TiO2@g-C3N4@biochar (TiO2@g-C3N4@BC) composite photocatalyst was successfully fabricated and...     

Investigation of indole biodegradation by Cupriavidus sp. strain IDO with emphases on downstream biotransformation and indigo production

Environmental Science and Pollution Research - Indole, as a typical N-heterocyclic aromatic pollutant, poses risks to living things; however, indole-biotransformation mechanisms remain...     

The effects of air pollution on the lung cancer mortality in rural areas of eastern China: a multi-region study

Environmental Science and Pollution Research - Recently, the burden of lung cancer (LC) has attracted global attention. Meanwhile, LC has become the leading cause of death in China. Many studies...     

CO2注气压力对CH4驱替特性影响实验研究*

为研究CO2驱替CH4过程中注气压力对气体解吸特性的影响,采用自主搭建的驱替实验平台,在0.6,0.8,1.0 MPa不同注气压力下进行驱替实验,研究CO2驱替CH4过程中煤层温度、气体浓度、置换效率和渗透率等变化规律。实验结果表明:提高CO2注气压力可提高CO2置换驱替煤层CH4的效果。随着注气压力增大,CH4累计解吸量增大,CO2突破时间越短,CO2封存量越大,置换效率升高,驱替比下降。注气压力为0.6,0.8,1.0 MPa时,CH4累计解吸量分别为90.2,94.1,97.8 L;CO2封存量分别为19.73,19.92,20.21 mL/g;置换效率由76.9%上升到80.2%再到82.9%,驱替比由3.28下降到3.17再到3.09。注气驱替CH4过程中煤层温度升高,可分为低速升温、高速升温和趋于平缓阶段。煤层温度最高变化量分别为9.4,11.5,12.7 ℃。同一注气压力下,煤层渗透率变化可分为缓慢增长、急剧下降和趋于稳定阶段。     

钯/泡沫镍电极对水体中2-氯联苯的电催化脱氯作用

采用两室流通式隔膜电解池,研究了钯修饰泡沫镍电极对纯水相中2-氯联苯(2-CB)的电催化还原脱氯作用,考察了电流密度、pH 值和溶液流速对2-CB 脱氯率的影响.结果表明,当电流密度为1.5mA/cm²、阴极液pH 值为5.5、阴极液流速为7.4mL/(min·cm²)时,脱氯反应30min,2-CB 脱氯率达91.4%.脱氯产物包括联苯和苯基环己烷,根据脱氯过程碳平衡关系可确定该过程为逐步氢化反应.     

pH值和曝气强度对铁还原预处理硝基苯废水效果的影响

从反应机理方面分析了pH值和曝气强度对铁还原预处理硝基苯废水的影响。研究表明:pH值对铁还原的影响明显,适当的曝气强度可有效提高铁还原预处理效果。综合考虑,最佳pH值范围为2~4,最佳曝气强度为1.50m3/(m2·h)。CODCr去除率达50%~60%,硝基苯去除率达90%以上,出水BOD5/CODCr由不到0.1提高至0.4以上。     

区域环境中三氟乙酸富积多相传质模型研究

建立了描述挥发性有机物在大气、水、土壤和底泥等环境中动态分布的多相传质模型,并用于分析长江流域江苏段及太湖水系区域内三氟乙酸(TFA)在各环境相中的分布. 采集实测数据约300个,比较实测值与模拟值,对模型的可靠行进行验证. 建立了检测环境中微量TFA前处理及方法. 结果表明:多相传质模型能够正确描述研究区域内环境中的TFA分布. 在给定排放量变化规律的前提下,预测未来10年内研究区域环境水体中ρ(TFA)将接近100 ng/L,接近现阶段欧美发达国家主要水体中的ρ(TFA).      

2,3,7,8-四氯二苯并二噁英与Aroclor 1254单独与联合作用对大鼠外周血淋巴细胞DNA的损伤效应(Damage Effects of Individual and Combined Exposure to 2,3,7,8-Tetrachlorodibenzo-p-Dioxin and Aroclor 1254 on DNA in Peripheral Blood Lymphocyte of Rats)

为探讨2,3,7,8-四氯二苯并二噁英(TCDD)和多氯联苯(Aroclor 1254)联合染毒对大鼠外周血淋巴细胞DNA的损伤效应,将20只雄性Sprague-Dawley(SD)大鼠随机均分为4组,即对照组(橄榄油)、Aroclor 1254单独染毒组(10mg·kg-1)、TCDD单独染毒组(10μg·kg-1)和联合染毒组(TCDD 10μg·kg-1+Aroclor 1254 10 mg·kg-1).大鼠每天灌胃染毒1次,连续染毒6d.染毒过程中记录大鼠的体征和体重.末次染毒后24h取外周血,分离淋巴细胞,采用碱性单细胞凝胶电泳技术(彗星试验)检测外周血淋巴细胞DNA损伤,并采用CASP软件分析各组彗星的尾部DNA百分含量(Tail DNA%)、尾长(Tail Length)和尾矩(Tail Moment).结果表明,染毒结束时TCDD单独染毒和联合染毒组大鼠体重显著低于对照组,且联合染毒组表现更为明显.TCDD单独染毒组和联合染毒组大鼠外周血淋巴细胞DNA可见明显损伤,TailDNA%、Tail Length和Tail Moment均显著高于对照组(p<0.05),且联合染毒组大鼠细胞DNA损伤更为严重,但Arolor 1254单独染毒组大鼠未见明显DNA损伤.析因分析提示TCDD与Aroclor 1254对大鼠外周血淋巴细胞DNA损伤的联合毒性效应为协同作用.本研究结果表明TCDD与Aroclor 1254联合染毒可加重大鼠外周血淋巴细胞DNA损伤,在对PCBs与二噁英的混合暴露进行危险性评估时要注意这种联合毒性作用.