A highly efficient calix[4]arene based resin for the removal of azo dyes

文章栏目：水污染防治

DOI 10.12030/j.cjee.201908056

中图分类号 X703 文献标识码 A

焦昭杰

, 

陈立功

, 

柳云骐, 等. 硫酸铜类芬顿法去除双酚A[J]. 环境工程学报，2020, 14(6): 1521-1528.JIAO Zhaojie, CHEN Ligong, LIU Yunqi, et al. Bisphenol A removal by Fenton-like oxidation with copper sulfate as catalyst[J].Chinese Journal of Environmental Engineering, 2020, 14(6): 1521-1528.

硫酸铜类芬顿法去除双酚A

焦昭杰1，陈立功1，柳云骐2，龚海峰1，张贤明1，高旭3，*

1. 重庆工商大学废油资源化技术与装备教育部工程研究中心，重庆 4000672. 中国石油大学(华东)重质油国家重点实验室，青岛 2665803. 重庆工商大学智能制造服务国际科技合作基地，重庆 400067

第一作者：焦昭杰(1981—)，男，博士，助理研究员。研究方向：高级氧化技术。E-mail：jiaozhaojie2001@*通信作者：高旭(1971—)，男，博士，教授。研究方向：工业污水处理工艺等。E-mail：gaoxu@ 

摘　要　在水处理应用中，为解决Fenton法通常需较低pH的局限性，提出了以硫酸铜为催化剂的类芬顿反应体系，以双酚A(BPA)为目标污染物，分别考察了催化剂用量、H2O2用量、反应温度、BPA初始浓度和pH对BPA去除效果的影响，分析了反应过程中pH和羟基自由基浓度的变化。结果表明：在催化剂用量为0.8 g·L−1、H2O2为78 mmol·L−1、BPA为152 mg·L−1、反应温度为75 ℃、反应时间为65 min的条件下，BPA和TOC的去除率分别为95.4%和85.9%；所建立的硫酸铜类芬顿反应体系，相比Fenton反应体系具有更宽的pH适应范围，可以在pH=3.0~10.1下进行反应，无需调节反应液的pH，且出水水质颜色好，成本低。以上研究结果可为有机废水的高效处理提供理论与技术支持，具有广阔的应用前景。关键词　硫酸铜；类芬顿；去除双酚A；有机废水 

Chinese Journal of Catalysis 41 (2020) 1613-1621催化学报2020年第41卷第10期丨

Article

ZnO nanorod decorated by Au-Ag alloy with greatly increased

activity for photocatalytic ethylene oxidation

Huishan Zhai, Xiaolei Liu, Zeyan Wang, Yuanyuan Liu, Zhaoke Zheng, Xiaoyan Qin, Xiaoyang Zhang,

Peng Wang *, Baibiao Huang #

State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, Shandong, China

ARTICLE INFOABSTRACT

Article history:Received 17 February 2020 Accepted 26 March 2020 Published 5 October 2020

Keywords:Surface plasmon resonance Au-Ag bimetallic alloy nanoparticles Cooperative action Effective carrier separationIn recent years, the preservation of fruits and vegetables in cold storage has become an issue of increasing concern, ethylene plays a leading role among them. We found ZnO has the effect of de­grading gaseous ethylene, however its effect is not particularly satisfactory. Therefore, we used simple photo-deposition procedure and low-temperature calcination method to synthesize Au, Ag, and AuAg alloy supported ZnO to improve the photocatalytic efficiency. Satisfactorily, after ZnO loaded with sole Au or Ag particles, the efficiency of ethylene degradation was 17.5 and 26.8 times than that of pure ZnO, showing a large increase in photocatalytic activity. However, the photocata­lytic stability of Ag/ZnO was very poor, because Ag can be easily photooxidized to Ag2〇. Surprising­ly, when ZnO was successfully loaded with the AuAg alloy, not only the photocatalytic activity was further improved to 94.8 times than that of pure ZnO, but also the photocatalytic stability was very good after 10 times of cycles. Characterization results explained that the Au-Ag alloy NPs modified ZnO showed great visible-light absorption because of the surface plasmon resonance (SPR) effect. Meanwhile, the higher photocurrent density showed the effective carrier separation ability in AuAg/ZnO. Therefore, the cooperative action of plasmonic AuAg bimetallic alloy NPs and efficient carrier separation capability result in the outstanding photoactivity of ethylene oxidation. At the same time, the formation of the alloy produced a new crystal structure different from Au and Ag, which overcomes the problem of poor stability of Ag/ZnO, and finally obtains AuAg/ZnO photo­catalyst with high activity and high stability. This work proposes a new concept of using metal alloys to remove ethylene in actual production.© 2020, Dalian Institute of Chemical Physics, Chinese Academy of Sciences.Published by Elsevier B.V. All rights reserved.

Removal of chromium (III) and cadmium (II) from aqueous solutions

Abstract

Chromium and cadmium are toxic heavy metals present in wastewaters from a

variety of industries. A strong cation exchange resin, Amberlite IR 120, was used

for the removal of chromium and cadmium. The resin was prepared in two

different cationic forms, as Na + and H +. The optimum conditions were

concentration, pH, stirring time and resin amount. The concentration range was

between 2-50 rag/L, pH range between 2-10, stirring time between 5-60 min, and the amount of

resin was from 50-1000 rag. Exchange capacities, moisture content and optimum conditions of

this resin were determined in a batch system. The stirring speed was 2000 rpm during all of

the batch experiments. The initial and final chromium and cadmium amounts were

/accountsVol.XXX,No.XX’XXXX’000–000’ACCOUNTSOFCHEMICALRESEARCH’A10.1021/ar2003418&XXXXAmericanChemical

SocietyPillararenes,ANewClassofMacrocyclesfor

SupramolecularChemistry

MINXUE,†YONGYANG,‡XIAODONGCHI,†ZIBINZHANG,†

ANDFEIHEHUANG*,†

†DepartmentofChemistry,ZhejiangUniversity,Hangzhou310027,People'sRepublicofChina,and‡DepartmentofChemistry,ZhejiangSci-TechUniversity,Hangzhou310018,People'sRepublicofChina

RECEIVEDONDECEMBER31,2011

Becauseoftheimportanceofnovelmacrocyclesinsupramolecularscience,interestinthepreparationofthesesubstanceshasgrownconsiderably.However,thediscoveryofanewclassofmacrocyclespresentschallengesbecauseoftheneedforroutestofurtherfunctionalizationofthesemoleculesandgoodhostÀguestcomplexation.Furthermore,usefulmacrocylichostsmustbeeasilysynthesizedinlargequantities.Withtheseissuesinmind,therecentlydiscoveredpillararenesattractedourattention.Thesemacrocyclescontainhydroquinoneunitslinkedbymethylenebridgesatparapositions.Althoughthecompositionofpillararenesissimilartothatofcalixarenes,theyhavedifferentstructuralcharacteristics.Oneconformationallystablememberofthisfamilyispillar[5]arene,whichconsistsoffivehydroquinoneunits.Thesymmetricalpillararchitectureandelectron-donatingcavitiesofthesemacrocyclesareparticularlyintriguingandaffordthemwithsomespecialandinterestingphysical,chemical,andhostÀguestproperties.Duetothesefeaturesandtheireasyaccessibility,pillararenes,especiallypillar[5]arenes,havebeenactivelystudiedandrapidlydevelopedwithinthelast4years.InthisAccount,weprovideacomprehensiveoverviewofpillararenechemistry,summarizingourresultsalongwithrelatedstudiesfromotherresearchers.Wedescribestrategiesforthesynthesis,isomerization,andfunctionalizationofpillararenes.Wealsodiscusstheirmacrocycliccavitysizes,theirhostÀguestproperties,andtheirself-assemblyintosupramolecularpolymers.Thehydroxylgroupsofthepillararenescanbemodifiedatallpositionsorselectivelyononeortwopositions.Throughavarietyoffunctionalizations,researchershavedevelopedmanypillararenederivativesthatexhibitveryinterestinghostÀguestpropertiesbothinorganicsolventsandinaqueousmedia.Guestmoleculesincludeelectronacceptorssuchasviologenderivativesand(bis)imidazoliumcationsandalkylchainderivativessuchasn-hexane,alkanediamines,n-octyltrimethylammonium,andneutralbis(imidazole)derivatives.ThesehostÀgueststudieshaveledtothefabricationof(pseudo)rotaxanesorpoly(pseudo)rotaxanes,supramoleculardimersorpolymers,artificialtransmembraneprotonchannels,fluorescentsensors,andotherfunctionalmaterials.