EFFECT OF FULVIC ACID WITH DIFFERENT MOLECULAR WEIGHT ON UV DEGRADATION OF MICROCYSTINS

WANG Gang; ZHANG Xiayao; WANG Feifeng; SUN Qiyuan

doi:10.13205/j.hjgc.202201006

Volume 40 Issue 1

Mar. 2022

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WANG Gang, ZHANG Xiayao, WANG Feifeng, SUN Qiyuan. EFFECT OF FULVIC ACID WITH DIFFERENT MOLECULAR WEIGHT ON UV DEGRADATION OF MICROCYSTINS[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(1): 32-37. doi: 10.13205/j.hjgc.202201006

Citation:

WANG Gang, ZHANG Xiayao, WANG Feifeng, SUN Qiyuan. EFFECT OF FULVIC ACID WITH DIFFERENT MOLECULAR WEIGHT ON UV DEGRADATION OF MICROCYSTINS[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(1): 32-37. doi: 10.13205/j.hjgc.202201006

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EFFECT OF FULVIC ACID WITH DIFFERENT MOLECULAR WEIGHT ON UV DEGRADATION OF MICROCYSTINS

doi: 10.13205/j.hjgc.202201006

School of Environmental Science and Engineering, Fujian Normal University, Fuzhou 350007, China

Received Date: 2021-04-13
Available Online: 2022-03-30
Publish Date: 2022-03-30

Abstract

Abstract

Cyanobacteria releases biotoxic microcystin(MC-LR) into the water column during its growth and reproduction, which is a potential threat to human health. Fulvic acid(FA) is a widely present aqueous environmental medium in water bodies, and the mechanism of its different molecular weight components on the photodegradation of MC-LR is unknown. In this study, we investigated the effects of molecular weight of FA and related condition factors on UV degradation of MC-LR through UV illumination experiments. The results showed that the degradation rate of MC-LR decreased and then increased with the increase of pH value; the degradation rate of MC-LR was 60.10% after 120 min of UV degradation in pure water; after FA was added, the degradation rate of MC-LR increased with the increase of its concentration, and 62.18% of MC-LR was degraded at 10 mgC/L. Under different molecular weight FA, the degradation rate range of MC-LR was 54.52%~65.61%, and the degradation process was in good accordance with the first-order reaction kinetic equation.The apparent rate constant was the highest when the molecular weight was 3~5 kDa and the concentration was 10 mgC/L, which was 0.03303 min^-1. This study provided a reference for optimizing the conditional ratio between FA and MC-LR and promoting the degradation of MC-LR.
- fulvic acid,
- algal toxin,
- photocatalysis,
- influencing factors,
- degradation kinetics

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References(27)

References

[1]	SUN J L,BU L J,DENG L,et al.Removal of Microcystis aeruginosa by UV/chlorine process:Inactivation mechanism and microcystins degradation[J].Chemical Engineering Journal,2018,349:408-415.
[2]	ANRREW T,MONLIKA D R,ALISON O NL,et al.Analysis of microcystins in cyanobacterial blooms from freshwater bodies in england[J].Toxins,2018,10(1):1-29.
[3]	PHAM T L,MOTOO U.An overview of the accumulation of microcystins in aquatic ecosystems[J].Journal of Environmental Management,2018,213:520-529.
[4]	BLANC L P,MERKLEY N,THOMAS K,et al.Isolation and Characterization of [D-Leu1]microcystin-LY from Microcystis aeruginosa CPCC-464[J].Toxins,2020,12(2):27.
[5]	SUO T Y,SOHAIL M,XIE S Y,et al.DNA Nanotechnology:a recent advancement in the monitoring of microcystin-LR[J].Journal of Hazardous Materials,2020,403:123418.
[6]	DIXIT F H,BARBEAU B,MOHSENI M.Characteristics of competitive uptake between microcystin-LR and natural organic matter (NOM) fractions using strongly basic anion exchange resins[J].Water Research,2018,139:74-82.
[7]	LI W Y,LIU Y,SUN X L,et al.Photocatalytic degradation of MC-LR in water by the UV/TiO₂/H₂O₂ process[J].Water Science & Technology Water Supply,2016,16(1):34-43.
[8]	常晶.基于水中微囊藻毒素MC-LR去除的不同氧化方法降解机制研究[D].哈尔滨:哈尔滨工业大学,2015.
[9]	位梦姣.基于水化学特征和荧光指纹的污染物源解析方法研究及其应用[D].西安:西北农林科技大学,2020.
[10]	周石磊,孙悦,张艺冉,等.基于UV-vis和EEMs解析白洋淀冬季冰封期间隙水DOM的光谱特征及来源[J].环境科学学报,2020,40(2):604-614.
[11]	王迪,张飞,张兆永,等.新疆艾比湖流域枯、丰水期三维荧光光谱特性及其与水质的关系[J].湖泊科学,2020,32(2):483-495.
[12]	SUN Q Y,WU S B,YIN R,et al.Effects of fulvic acid size on microcystin-LR photodegradation and detoxification in the chlorine/UV process[J].Water Research,2021,193(14):116893.
[13]	WANG W D,YANG H W,WANG X C,et al.Effects of fulvic acid and humic acid on aluminum speciation in drinking water[J].Journal of Environmental Sciences,2010,22(2):211-217.
[14]	BURNS J M,COOPER W J,FERRY J L,et al.Methods for reactive oxygen species (ROS) detection in aqueous environments[J].Aquatic Sciences,2012,74(4):683-734.
[15]	KARPUZCU M E,MCCABE A J,ARMOLD W A.Phototransformation of pesticides in prairie potholes:effect of dissolved organic matter in triplet-induced oxidation[J].Environmental Science Processes & Impacts,2016,18(2):237-245.
[16]	SHINDE S S,BHOSALE C H,RAJPURE K Y.Hydroxyl radical’s role in the remediation of wastewater[J].Journal of Photochemistry B,2012,116:66-74.
[17]	LUO X Z,ZHENG Z,GREAVES J,et al.Trimethoprim:Kinetic and mechanistic considerations in photochemical environmental fate and AOP treatment[J].Water Research,2012,46(4):1327-1336.
[18]	MAAGD P G J,HENDRIKS A J,SEINEN W,et al.pH-Dependent hydrophobicity of the cyanobacteria toxin microcystin-LR[J].Water Research,1999,33(3):677-680.
[19]	YAN S W,ZHANG D,SONG W H.Mechanistic considerations of photosensitized transformation of microcystin-LR (cyanobacterial toxin) in aqueous environments[J].Environmental Pollution,2014,193:111-118.
[20]	KRISTOPHER M N,SILVIO C.Triplet state dissolved organic matter in aquatic photochemistry:reaction mechanisms,substrate scope,and photophysical properties[J].Environmental Science.Processes & Impacts,2016,18(11):1381-1399.
[21]	LEECH D M,SNYDER M T,WETZEL R G.Natural organic matter and sunlight accelerate the degradation of 17ss-estradiol in water[J].Science of the Total Environment,2009,407(6):2087-2092.
[22]	DONG R,HUANG B,DAN X,et al.Photodegradation of 17α-ethynylestradiol in dissolved humic substances solution:kinetics,mechanism and estrogenicity variation[J].Journal of Environmental Sciences,2017,54(4):196-205.
[23]	SUN Q Y,ZHANG T F,WANG F F,et al.Ultraviolet photosensitized transformation mechanism of microcystin-LR by natural organic matter in raw water[J].Chemosphere,2018,209:96-103.
[24]	肖杰.溶解性有机质对多环芳烃光解的影响机制[D].大连:大连理工大学,2013.
[25]	KIM M K,WON A Y,ZOHOH K D.Effects of molecular size fraction of DOM on photodegradation of aqueous methylmercury[J].Chemosphere,2017,174:739-746.
[26]	OU X X,CHEN S,QUAN X,et al.Photoinductive activity of humic acid fractions with the presence of Fe(Ⅲ):the role of aromaticity and oxygen groups involved in fractions[J].Chemosphere,2008,72(6):925-931.
[27]	张天芳,王晶晶,吴春山,等.水体中溶解性有机质对有机污染物降解机制的研究进展[J].海峡科学,2017(10):10-12.