凹凸棒石吸附氧化催化剂对甲醛的脱除研究

以酸改性凹凸棒石为载体,采用浸渍法以不同金属氧化物做活性组分进行了脱除甲醛的活性组分筛选,通过正交实验优化制备氧化锰凹凸棒吸附氧化催化剂工艺条件.结果表明,负载9%(质量分数)的锰氧化物,300℃焙烧4h制备的粒度为40～60目的凹凸棒吸附氧化催化剂在初始浓度为9.5552mg·m-3的甲醛空气中,24h时对甲醛的吸附量可达到0.188mg·g-1,甲醛脱除率达到98.35%.傅立叶变换红外光谱(FTIR)及X射线衍射(XRD)测试表明,凹凸棒吸附氧化催化剂对空气中的甲醛在室温下起到了吸附与催化氧化的作用.     

我国挥发性有机物定义和控制指标的探讨

挥发性有机物(VOCs)种类繁多,对人体健康和生态环境危害大,是最为复杂的一类污染物.世界各国对其定义以及控制指标有所区别,我国的国家标准和地方标准对其也没有统一的定义,控制指标和对应的监测方法也各有不同.通过对国内外现行VOCs定义和控制指标的深入分析,提出VOCs的定义应根据"空气质量管理"与"污染源排放管理"关注问题的不同而有所区别;从生产源头、工艺过程、末端排放、总量控制等不同控制途径,建立的VOCs控制指标体系由10项指标构成;在制订行业VOCs排放标准时,应根据行业生产工艺特点、VOCs排放方式、可能采取的控制措施等,从中选择最有效的控制方式和指标(或指标组合).     

环境基因组技术在微生物多样性研究中的应用

环境中的微生物具有极大的生物多样性,但99%的微生物不能通过标准的实验技术加以培养,不依赖于培养的环境基因组技术由于适合分析生态系统中整个复杂的微生物基因组而迅速发展起来。文章针对环境基因组技术的原理、方法以及目前该技术在环境微生物多样性研究中的应用等作一综述。     

Collaborative influence of morphology tuning and RE (La,Y, and Sm) doping on photocatalytic performance of nanoceria

Environmental Science and Pollution Research - Tuning morphology and doping additional rare earth (RE) cations are potential techniques to promote the photocatalytic performance of ceria (CeO2),...     

Do anthropogenic and natural factors elevate the haze pollution in the South Asian countries? Evidence from long-term cointegration and VECM causality estimation

Environmental Science and Pollution Research - Anthropogenic and natural factors lead to substantial environmental degradation. This shift is aligned with the country's overall development,...     

汽车行业中管件液压成形技术的新进展

管件液压成形技术作为汽车零件减重的重要方法之一 ,近几年发展很快 ,国外多个汽车公司已将其应用于管类零件的生产。主要介绍了该技术的工艺特点 ,国内外应用情况与相关研究成果。     

Enantioselective hydrolysis and photolysis of mandipropamid in different aquatic environments — evaluation of influencing factors

Environmental Science and Pollution Research - The hydrolysis and photolysis of the chiral fungicide mandipropamid were investigated, and the potential enantioselectivity of mandipropamid in...     

A nationwide survey of 20 legacy brominated flame retardants in indoor dust from China: continuing occurrence,national distribution,and implication for human exposure

Environmental Science and Pollution Research - Despite the restrictions on polybrominated diphenyl ethers (PBDEs) and hexabromocyclododecanes (HBCDDs), these chemicals are still ubiquitous...     

Accelerated sunlight photocatalysis through improved electron mobility between g-C3N4 and BiPO4 nanomaterial

Herein, we report a detailed study on creating heterojunction between graphitic carbon nitride (g-C₃N₄) and bismuth phosphate (BiPO₄), enhancing the unpaired free electron mobility. This leads to an accelerated photocatalysis of 2,4-dichlorophenols (2,4-DCPs) under sunlight irradiation. The heterojunction formation was efficaciously conducted via a modest thermal deposition technique. The function of g-C₃N₄ plays a significant role in generating free electrons under sunlight irradiation. Together, the generated electrons at the g-C₃N₄ conduction band (CB) are transferred and trapped by the BiPO₄ to form active superoxide anion radicals (?O₂^?). These active radicals will be accountable for the photodegradation of 2,4-DCPs. The synthesized composite characteristics were methodically examined through several chemical and physical studies. Due to the inimitable features of both g-C₃N₄ and BiPO₄, its heterojunction formation, 2.5wt% BiPO₄/g-C₃N₄ achieved complete 2,4-DCP removal (100%) in 90 min under sunlight irradiation. This is due to the presence of g-C₃N₄ that enhanced electron mobility through the formation of heterojunctions that lengthens the electron-hole pairs’ lifetime and maximizes the entire solar spectrum absorption to generate active electrons at the g-C₃N₄ conduction band. Thus, this formation significantly draws the attention for future environmental remediation, especially in enhancing the entire solar spectrum’s harvesting.

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Experimental and theoretical study of a new CDI device for the treatment of desulfurization wastewater

Environmental Science and Pollution Research - According to the characteristics of desulfurization wastewater, A new capacitive deionization (CDI) device was designed to study the desalination...