Advanced Aerogels from Wool Waste Fibers for Oil Spill Cleaning Applications

Journal of Polymers and the Environment - Oil spills causes severe degradation to marine ecosystems and poses long term health effects on many animals on the food chain, including humans. A...     

Combined effects of adsorption and photocatalysis by hybrid TiO2/ZnO-calcium alginate beads for the removal of copper

The use of nanosized titanium dioxide(TiO_2) and zinc oxide(ZnO) in the suspension form during treatment makes the recovering and recycling of photocatalysts difficult.Hence,supported photocatalysts are preferred for practical water treatment applications.This study was conducted to investigate the efficiency of calcium alginate(CaAlg) beads that were immobilized with hybrid photocatalysts,TiO_2/ZnO to form TiO_2/ZnO-CaAlg.These immobilized beads,with three different mass ratios of TiO_2:ZnO(1:1,1:2,and 2:1) were used to remove Cu(Ⅱ) in aqueous solutions in the presence of ultraviolet light.These beads were subjected to three cycles of photocatalytic treatment with different initial Cu(Ⅱ) concentrations(10-80 ppm).EDX spectra have confirmed the inclusion of Ti and Zn on the surface of the CaAlg beads.Meanwhile,the surface morphology of the beads as determined using SEM,has indicated differences of before and after the photocatalytic treatment of Cu(Ⅱ).Among all three,the equivalent mass ratio TiO_2/ZnO-CaAlg beads have shown the best performance in removing Cu(Ⅱ) during all three recycling experiments.Those TiO_2/ZnO-CaAlg beads have also shown consistent removal of Cu,ranging from 7.14-52.0 ppm(first cycle) for initial concentrations of10-80 ppm.In comparison,bare CaAlg was only able to remove 6.9-48 ppm of similar initial Cu concentrations.Thus,the potential use of TiO_2/ZnO-CaAlg beads as environmentally friendly composite material can be further extended for heavy metal removal from contaminated water.     

湖泊连通河道蓝藻通量自动监测方法

湖库中蓝藻细胞一旦形成表层颗粒细胞团形式的水华,就会具有较强的漂移扩散能力,并能对水体景观形成明显影响,成为河湖环境管理的重点关注对象.如何快速高效监测蓝藻颗粒的迁移通量,已成为湖库连通河道水质管理的技术难点.为满足蓝藻水华较重湖泊连通河道蓝藻通量实时监控需求,以太湖梅梁湾连通河道—梁溪河为例,于2019年6-8月蓝藻水华季节,监测了景宜桥断面蓝藻空间分布且逐日监测叶绿素a浓度,并结合岸基式水质和蓝藻自动监测系统,构建了人工监测蓝藻通量与自动监测参数之间的换算关系,开发了梁溪河蓝藻通量的高频自动监测方法并分析了影响因素.结果表明,在U型断面的流通河道中,景宜桥断面的蓝藻在空间分布上呈表层高、底层低、滨岸带略高的特征,近岸表层采样的自动监测系统获得的水体叶绿素a浓度比整个河道断面平均值高出30％;通过建立的蓝藻通量监测方法对比,发现自动与人工监测蓝藻通量逐日变化整体上保持一致,且总量与人工相当,比值为1.07,精确反映了整个河道蓝藻通量的变化规律;2种监测方式的差异性分析表明,原位水质和蓝藻自动监测系统对梁溪河蓝藻通量的实时监控有良好的效果,此系统的应用实现了河道蓝藻通量的实时在线监测,为蓝藻水华应急处置管理提供了关键技术支撑.     

Potential ecological and health risk assessment of different kiwifruit orchards in Qianjiang district,Chongqing city,China

Environmental Science and Pollution Research - Heavy metal (HM) pollution in orchards is becoming serious in many countries, and some fruit HMs exceed the safety limits. In this study, contents of...     

UiO-66对废水中二氯苯氧乙酸的吸附特性

以Ui O-66型金属有机框架为吸附剂,研究了时间、p H值和温度对自制金属有机框架Ui O-66吸附2,4-D性能的影响.结果表明,Ui O-66的吸附平衡时间为24 h;初始溶液最佳p H值为4.0;Ui O-66上的平衡吸附量随温度的升高而增加,实验最佳温度应控制在30℃.Ui O-66对2,4-D的吸附符合Langmuir吸附模型;吸附动力学符合拟二级模型;颗粒内扩散过程是吸附速率控制步骤;热力学计算结果显示ΔG0、ΔH0、ΔS0,由此判断吸附是自发、吸热、熵增加的化学过程.本实验表明,Ui O-66在去除农业废水中2,4-D领域有实际应用的潜力.     

Development of new computational machine learning models for longitudinal dispersion coefficient determination: case study of natural streams,United States

Environmental Science and Pollution Research - Natural streams longitudinal dispersion coefficient (Kx) is an essential indicator for pollutants transport and its determination is very important....     

Green environmental technologies and waste utilization

Environmental Science and Pollution Research -     

Acute and chronic health risk assessment for inhalation and ingestion exposure in acrylic acid leak accidents

Environmental Science and Pollution Research - We established a hypothetical acrylic acid leak accident scenario, conducted a health risk assessment of local residents, and compared an actual...     

Foliar application of several reagents reduces Cd concentration in wheat grains

Environmental Science and Pollution Research - Cadmium (Cd) in agricultural soils can be absorbed by wheat and transferred into the grains, risking human health. In order to find the optimal foliar...     

Effect of urbanization on the structure and functional traits of remnant subtropical evergreen broad-leaved forests in South China

We investigated the effects of major environmental drivers associated with urbanization on species diversity and plant functional traits (PFTs) in the remnant subtropical evergreen broad-leaved forests in Metropolitan Guangzhou (Guangdong, China). Twenty environmental factors including topography, light, and soil properties were used to quantify the effects of urbanization. Vegetation data and soil properties were collected from 30 400-m² plots at 6 study sites in urban and rural areas. The difference of plant species diversity and PFTs of remnant forests between urban and rural areas were analyzed. To discern the complex relationships, multivariate statistical analyses (e.g., canonical correspondence analysis and regression analysis) were employed. Pioneer species and stress-tolerant species can survive and vigorously establish their population dominance in the urban environment. The native herb diversity was lower in urban forests than in rural forests. Urban forests tend to prefer the species with Mesophanerophyte life form. In contrast, species in rural forests possessed Chamaephyte and Nanophanerophyte life forms and gravity/clonal growth dispersal mode. Soil pH and soil nutrients (K, Na, and TN) were positively related to herb diversity, while soil heavy metal concentrations (Cu) were negatively correlated with herb diversity. The herb plant species diversity declines and the species in the remnant forests usually have stress-tolerant functional traits in response to urbanization. The factors related to urbanization such as soil acidification, nutrient leaching, and heavy metal pollution were important in controlling the plant diversity in the forests along the urban–rural gradients. Urbanization affects the structure and functional traits of remnant subtropical evergreen broad-leaved forests.