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以玉米秸秆为原料,硫酸锌为改性剂,采用一步热解法制备了ZnO/ZnS异质结构改性生物炭(MBC),并将其用于自然光增强吸附水中亚甲基蓝。表征结果显示:与未改性生物炭相比,MBC的比表面积显著增大,ZnO/ZnS异质结构颗粒均匀分布在其表面。实验结果表明:自然光可增强MBC对亚甲基蓝的吸附能力,600℃热解制备的MBC(MBC600)性能最佳;自然光下,初始质量浓度为10 mg/L、pH约为7的亚甲基蓝水溶液经MBC600处理240 min后,COD和色度均降为0;吸附过程更符合准二级动力学模型和Freundlich等温吸附模型;重复使用5次后,MBC600对亚甲基蓝的去除率仍保持在95%以上。 相似文献
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DNA螺旋状的游泳跳水馆充分利用自然光、自行车馆的赛道误差小于北京奥运会比赛馆、全国首个板球场可容纳超过5000名观众、亚运媒体村首次开放的样板房宽敞明亮……美轮美奂的体育场馆是点亮城市的风景,节约、环保、人性化的运动场所是和谐人居的精华所在,第十六届广州亚运会将会是最好的证明,现在就来一探究竟吧! 相似文献
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UV-B增加对菠菜生长发育和品质的影响 总被引:6,自引:2,他引:6
研究了在大田栽培和自然光的条件下,模拟紫外辐射的增加对菠菜生长发育和品质的影响。生长指标的分析结果表明,随着UV-B辐射的增加,菠菜的干质量、叶面积、绿叶数、株高生长均呈降低趋势,而且随着UV-B越强,降低程度越大,并在一定程度上延缓植株生长。品质指标的分析结果表明,UV-B辐射增强,菠菜叶片的可溶性糖质量分数降低,维生素C质量分数降低,随UV-B辐射强度增大,可溶性糖和维生素C质量分数降低的幅度愈大;UV-B辐射增强,菠菜叶片的蛋白质和抗坏血酸表现为质量分数升高,但当UV-B辐射超过一定强度,二者又表现为低于对照。 相似文献
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暗处理和自然光修复对菹草叶片过氧化物酶和过氧化氢酶活性的影响 总被引:1,自引:0,他引:1
以自然光为对照,在预先进行暗处理,然后进行光修复的条件下,对菹草(Potamogeton crispus)过氧化物酶(POD)和过氧化氢酶(CAT)活性及其与处理时间的关系进行了初步研究,结果表明:POD活性随着暗处理时间的延长而增强,随着光修复时间的延长而减弱;暗处理与对照相比,菹草叶片POD活性之间差异不显著;光修复与对照相比,前3天内,POD活性差异不显著,随着光修复时间的延长,POD活性出现显著差异(^*P〉0.05)。CAT活性在暗处理和光修复中都一直低于对照值;暗处理开始2天,活性开始上升,达到最大值后下降,与对照菹草叶片CAT活性比较,前6天差异显著(^*P〉0.05),第7天为差异极显著(^**P〉0.01);在光修复过程中,CAT活性第1天明显下降,与对照相比,除第3天表现出差异性显著(^*P〉0.05)以外,其它均差异不显著。 相似文献
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Abiotic degradation of four phthalic acid esters in aqueous phase under
natural sunlight irradiation
Abiotic degradability of four phthalic acid esters (PAEs) in the aquatic phase was evaluated over a wide pH range 5–9. The PAE
solutions in glass test tubes were placed either in the dark and under the natural sunlight irradiation for evaluating the degradation rate
via hydrolysis or photolysis plus hydrolysis, respectively, at ambient temperature for 140 d from autumn to winter in Osaka, Japan.
The e ciency of abiotic degradation of the PAEs with relatively short alkyl chains, such as butylbenzyl phthalate (BBP) and di-nbutyl
phthalate (DBP), at neutral pH was significantly lower than that in the acidic or alkaline condition. Photolysis was considered
to contribute mainly to the total abiotic degradation at all pH. Neither hydrolysis nor photolysis of di-ethylhexyl phthalate (DEHP)
proceeded significantly at any pH, especially hydrolysis at neutral pH was negligible. On the other hand, the degradation rate of diisononyl
phthalate (DINP) catalyzed mainly by photolysis was much higher than those of the other PAEs, and was almost completely
removed during the experimental period at pH 5 and 9. As a whole, according to the half-life (t1=2) obtained in the experiments, the
abiotic degradability of the PAEs was in the sequence: DINP (32–140 d) > DBP (50–360 d), BBP (58–480 d) > DEHP (390–1600 d)
under sunlight irradiation (via photolysis plus hydrolysis). Although the abiotic degradation rates for BBP, DBP, and DEHP are much
lower than the biodegradation rates reported, the photolysis rate for DINP is comparable to its biodegradation rate in the acidic or
alkaline condition. 相似文献
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