scholarly journals Hydroxylamine Accelerates the Cycle of Fe(III)/Fe(II)-Cu(II)/Cu(I) to Enhance the Ability of Fe-Cu Bimetallic System to Activate Peroxymonosulfate to Degrade AO7

Author(s):  
Ming Zhang ◽  
Kuo Zhang ◽  
Runjuan Zhou ◽  
Jinpeng Wang

Abstract In this study, a new type of iron/copper bimetallic combined with hydroxylamine (HA) activated peroxymonosulfate (PMS) was constructed to treat organic pollutants. Selecting the azo dye AO7 as the representative of organic pollutants, the new system can achieve nearly 100% degradation of AO7 within 5 minutes. The Fe(Ⅲ)/Cu(Ⅱ)/HA/PMS system mainly generates SO4·- to achieve the degradation of AO7 in acidic environment, while neutral and alkaline environments rely on ·OH. The presence of hydroxylamine accelerates the cycle of Fe(Ⅲ)/Fe(Ⅱ) and Cu(Ⅱ)/Cu(Ⅰ) in the system, and enhances the degradation ability of the system for organic pollutants. The addition of trace Cu(Ⅱ) (1 μM) enhances the ability of a single Fe(Ⅲ)/HA/PMS system to degrade AO7 in neutral and alkaline environments without causing secondary copper pollution. The common inorganic anions Cl- and NO3- in water have almost no effect on the degradation of AO7 in the system. The constructed Fe(Ⅲ)/Cu(Ⅱ)/HA/PMS system is an efficient and clean organic pollutant wastewater treatment process, which has very promising application prospects.

Catalysts ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 709 ◽  
Author(s):  
Baoyin Cui ◽  
Haitao Cui ◽  
Zhenrong Li ◽  
Hongyu Dong ◽  
Xin Li ◽  
...  

A new type of I-deficient bismuth oxyiodide Bi3O5I2 with a hollow morphology was prepared by the solvothermal process. The structure, composition, morphology, optical property and photoelectric property of the as prepared photocatalyst were investigated through some characterization methods. Those characterization results showed that Bi3O5I2 displayed a larger specific surface area, promising band structure and lower recombination of photoinduced carriers than pure BiOI. Bi3O5I2 had a higher photocatalytic activity than BiOI on the decomposition of methyl orange (MO) under simulated solar light irradiation. The superoxide (·O2−) and hole (h+) were the dominating active species during the degradation of MO. Its stability and reusability performance showed its great promising application in the degradation of organic pollutant.


2020 ◽  
Vol 11 (SPL1) ◽  
pp. 907-912
Author(s):  
Deepika Masurkar ◽  
Priyanka Jaiswal

Recently at the end of 2019, a new disease was found in Wuhan, China. This disease was diagnosed to be caused by a new type of coronavirus and affected almost the whole world. Chinese researchers named this novel virus as 2019-nCov or Wuhan-coronavirus. However, to avoid misunderstanding the World Health Organization noises it as COVID-19 virus when interacting with the media COVID-19 is new globally as well as in India. This has disturbed peoples mind. There are various rumours about the coronavirus in Indian society which causes panic in peoples mind. It is the need of society to know myths and facts about coronavirus to reduce the panic and take the proper precautionary actions for our safety against the coronavirus. Thus this article aims to bust myths and present the facts to the common people. We need to verify myths spreading through social media and keep our self-ready with facts so that we can protect our self in a better way. People must prevent COVID 19 at a personal level. Appropriate action in individual communities and countries can benefit the entire world.


2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Khee Chung Hui ◽  
Hazwani Suhaimi ◽  
Nonni Soraya Sambudi

Abstract Titanium dioxide (TiO2) is commonly used as a photocatalyst in the removal of organic pollutants. However, weaknesses of TiO2 such as fast charge recombination and low visible light usage limit its industrial application. Furthermore, photocatalysts that are lost during the treatment of pollutants create the problem of secondary pollutants. Electrospun-based TiO2 fiber is a promising alternative to immobilize TiO2 and to improve its performance in photodegradation. Some strategies have been employed in fabricating the photocatalytic fibers by producing hollow fibers, porous fibers, composite TiO2 with magnetic materials, graphene oxide, as well as doping TiO2 with metal. The modification of TiO2 can improve the absorption of TiO2 to the visible light area, act as an electron acceptor, provide large surface area, and promote the phase transformation of TiO2. The improvement of TiO2 properties can enhance carrier transfer rate which reduces the recombination and promotes the generation of radicals that potentially degrade organic pollutants. The recyclability of fibers, calcination effect, photocatalytic reactors used, operation parameters involved in photodegradation as well as the commercialization potential of TiO2 fibers are also discussed in this review.


Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4079
Author(s):  
Radhalayam Dhanalakshmi ◽  
Nambi Venkatesan Giridharan ◽  
Juliano C. Denardin

Magnetic-field-accelerated photocatalytic degradation of the phenol red (PR) as a model organic pollutant was studied using rare-earth elements modified BiFeO3 (Bi1−xRxFeO3 (R = Ce, Tb; x = 0.0, 0.05, 0.10 and 0.15); BFO: RE) nanostructures. The nanostructures were prepared via the hydrothermal process and their morphological, structural, functional, optical and magnetic features were investigated in detail. The effect of magnetic fields (MFs) on photocatalysis were examined by applying the different MFs under visible light irradiation. The enhanced photodegradation efficiencies were achieved by increasing the MF up to 0.5T and reduced at 0.7T for the compositions x = 0.10 in both Ce and Tb substituted BFO. Further, mineralization efficiencies of PR, reproducibility of MF-assisted photocatalysis, stability and recyclability of BFO: RE nanostructures were also tested.


Author(s):  
Zhang Hong ◽  
Wei-qing Cao ◽  
Ting Li Yang ◽  
Jin Kui Chu

Abstract This paper is the second of a series of two papers which designed a new type of load balancing mechanisms for planetary gearings with arbitrary number of planets. In this paper the common expression of the non-uniform load share factor was deduced, and a function parameter:force-arm factor and their solution was given. That makes it possible that the dimensions and the ability of load equilibrium of Multi-Link Load Balancing Mechanisms can be determined. The criteria of optimum load balancing Mechanisms selection were set up with consider of the effects of turning pair clearances, and optimum mechanisms were selected among the 15 candidates obtained in Part 1. Finally, it was demonstrated that the optimum multi-link load balancing mechanisms for arbitrary number of planets had the similar topological structures and same function and performence of load equilibrium.


2014 ◽  
Vol 496-500 ◽  
pp. 1044-1047 ◽  
Author(s):  
Jia Xiong Zhu ◽  
Qiang Tong

In this paper, based on the principle of induction heating and eddy current fields working, the equivalent circuit model of induction cooker heating was proposed and analyzed. By using the finite element numerical analysis software, the optimization design and model simulations of induction cooker were implemented. Finally, a new design of induction cooker with the uniform heating-coil was proposed, and the magnetic circuit modeling and simulation of new type induction cooker heating was carried out, the eddy current loss density distribution in the common wire coil and the improved wire coil was separately calculated and compared. The results shown the new wire coil had higher energy efficiency and more uniform heating characteristics, which provided a reference for the future optimization design and development of induction cooker.


2014 ◽  
Vol 43 (15) ◽  
pp. 5173-5182 ◽  
Author(s):  
L. T. Gibson

This tutorial review will focus on the removal of organic pollutants from the aqueous phase by mesoporous silica.


Author(s):  
W. J. Xie ◽  
L. Zhang ◽  
H. P. Chen

Abstract. GlobeLand30 update data is one of the important products of the Construction Maintenance and Update of Geographic Information Resources Project (hereinafter referred to as the Update Project). It provides important basic information for national geographical conditions monitoring, eco-environmental assessment and global geographic information integrated services. Different from the land cover classification data in National Geoinformation Surveying and Monitoring Project, GlobeLand30 update data is a completely new type of scientific research outcomes with new setup of resolution, its data format and data structure are newly set according to the requirements of the Update Project. Therefore, current inspecting methods are of limitations and incompatibility and cannot be firmly reasonable for inspecting the accuracy of GlobeLand30 update data. Combining with the practice of quality control for the Update Project, this paper proposes a set of methods and processes for the quality inspection of the GlobeLand30 update data. It also summarizes the key points of its inspection and analyses the common errors found in the actual inspection practice of the Update Project from 2017 to 2018. It can provide a certain technical reference for the quality control and quality improvement of GlobeLand30 update data in the Update Project.


2021 ◽  
Vol 10 (2) ◽  
pp. 257-274
Author(s):  
Nofrida Panjaitan ◽  
Joko Adianto

The spread of pneumonia cases caused by a new type of Coronavirus (Novel Coronavirus) SARS Cov-2 was established by WHO called Coronavirus Disease 2019 (COVID-19) on February 2020 and designated as a pandemic on March 11, 2020. However, an interesting phenomenon arises, despite the high number of COVID-19 spread in Jakarta. That is as of April 10, 2020, 50 out of 267 urban villages in Jakarta are declared free of COVID-19 (not infected with the virus) and one of them is the most populous village in Jakarta called the most densely populated urban village in Southeast Asia, namely Kalianyar in Tambora Sub District, West Jakarta.This study aims to find out how does Kalianyar combat the spread of COVID-19, recalling that considering the nature of the virus transmission, Kalianyar has high potential to be a vulnerable zone. The research was conducted through a qualitative analysis on a case study of Kalianyar aiming to examine the deep explanation and understanding of distinctive implementation and to obtain the lesson learned from the implementation of Fournier's idea seeing how the common process occurs. The common process occurring within social organization in Kalianyar shows that there are relational and reciprocal relationships resulting from each activity related to the three axes as suggested by Fournier.


Author(s):  
Hromko T.V.

Purpose. The article considers methodological problems of mono-verbal ideographic dictionary as a separate lexicographic set of dialectal usus, built on the onomasiological principle, on the semantic relations of words from the concept to its lexical counterparts. By typology, ideographic and explanatory dictionaries are complementary, which determines the equipolent connection of the ideographic dictionary with the thesaurus of a separate language system. Methods. The monophonic ideographic dictionary proposed by the author offers a methodology for developing an ideographic dictionary of speech on a purely linguistic basis, in the direction “from the core to the periphery”, because the lexical structure of the idiom, in contrast to the common language, is narrowly accessible for speakers of the literary idiom and widely available for scientific interpretation of the lexicon of speech, and given the completeness of the presentation allows the use of quantitative methods. They ensure the objectivity of the obtained results and significantly reduce the time for their receipt and processing, which in the long run will provide objective results for further qualitative (qualitative) analysis – a monographic description of the language system of speech. Results. Monographic ideographic dictionary is a new type of dictionary – linguistic dialectological ideographic dictionary of scientific and linguodidactical purpose. Methodologically, its conclusion involves the stratification of vocabulary by functional, syntagmatic, paradigmatic and epidigmatic system parameters. Conclusions. Improving the method of parametric analysis for a one-word ideographic dictionary involves in the process of compiling the author of the “Ideographic Dictionary of the dialect of Pishchany Brid village of Dobrovelychkivsky district of Kirovohrad region” conducting various typological studies: continuing to collect natural dialect material, representation of the place of this lexical unit in its structure, etc., as well as ideographic lexicographic parameterization for component analysis of dialectal vocabulary, which will extrapolate the spoken material, and in the future will serve to solve a number of theoretical and practical problems of linguistics, and research will enter the linguistic picture of the world and give objective scientific results.Key words: dialectology, lexicography, monoidiom research, ideographic method, quantitative methods, qualitative analysis of vocabulary. Анотація.Мета. У статті розглядаються методологічні проблеми моноговіркового ідеографічного словника як окремого лексикографічного зводу діалектного узусу, побудованого за ономасіологічним принципом, за смисловими відношеннями слів від поняття до його лексичних відповідників. За типологією ідеографічні й тлумачні словники є взаємодоповню-вальними, що й визначає еквіполентний зв’язок ідеографічного словника з тезаурусом окремої мовної системи. Методи.Пропонований автором моноговірковий ідеографічний словник пропонує методологію розробки ідеографічного словника говірки за суто лінгвістичною основою, у напрямі «від ядра до периферії», оскільки лексичний склад ідіому, на відміну від загальномовного, є вузькодоступним для носіїв літературного ідіому і широкодоступним для наукової інтерпретації лексикону говірки, а з огляду на повноту представлення дозволяє використовувати квантитативні методи. Вони забезпечують об’єктивність отриманих результатів і значно скорочують час на їх отримання і обробку, що у перспективі дасть об’єктивні результати для подальшого квалітативного (якісного) аналізу – монографічного опису мовної системи говірки. Результати. Моноговірковий ідеографічний словник є новим типом словника – лінгвістичним діалектологічним ідеографічним словником наукового та лінгводидактичного призначення. Методологічно його укладання передбачає стратифікацію лексики за функціональним, синтагматичним, парадигматичним й епідигматичним системними параметрами. Висновки. Удосконалення методу параметричного аналізу для моноговіркового ідеографічного словника передбачає у процесі укладан-ня автором «Ідеографічного словника говірки села Піщаний Брід Добровеличківського району Кіровоградської області» проведення різного роду типологічних досліджень: продовження збирання польового діалектного матеріалу, проведення квалітативного аналізу лексики на предмет ядра й периферії мовної системи, наочного представлення того, яке місце посідає така лексична одиниця в його структурі тощо, а також ідеографічної лексикографічної параметризації для проведення компонентного аналізу діалектної лексики, що екстраполюватиме говірковий матеріал, а в перспективі прислужиться для вирішення низки теоретичних і практичних завдань лінгвістики, і проведені за ним дослідження увіллються в мовну картину світу та дадуть об’єктивні наукові результати.Ключові слова: діалектологія, лексикографія, моноговіркові дослідження, ідеографічний метод, квантитативний метод, квалітативний аналіз лексики.


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