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511.
以电厂废弃物粉煤灰为原料、采用碱熔-水热法制备了粉煤灰合成A型沸石(以下简称沸石),再以沸石对溶液中的Cs+进行分离富集,最后在碱激发剂的作用下以粉煤灰和吸附后的沸石制得地聚合物固化体。对固化体的性能进行了评价,并探讨了固化机理。实验结果表明:在吸附温度25℃、初始Cs+质量浓度100 mg/L、固液比10.0 g/L的条件下,沸石对的Cs+的吸附率达98%,比粉煤灰提高了2倍以上;沸石掺量为20%~30%(w)时,固化体的抗压强度符合GB 14569.1—2011要求,固化体中Cs+的42 d浸出率和累计浸出分数均远优于GB 14569.1—2011限值,表现出优异的抗浸出性能。 相似文献
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Yu Bo Lu Xinwei Fan Xinyao Fan Peng Zuo Ling Yang Yufan Wang Lingqing 《Environmental geochemistry and health》2022,44(10):3541-3554
Environmental Geochemistry and Health - The spatial distribution, pollution level, and exposure risk of Pb in the finer dust (particle size?<?63 μm) of residential... 相似文献
515.
Chen Kang Liao Chenggang Li Ping Li Xingong Li Xianjun Zuo Yingfeng 《Journal of Polymers and the Environment》2022,30(6):2209-2221
Journal of Polymers and the Environment - Poor interfacial compatibility between wheat straw and polylactic acid (PLA) remains a problem that directly affects the overall performance of wheat... 相似文献
516.
Effects of Stocking Rate on the Variability of Peak Standing Crop in a Desert Steppe of Eurasia Grassland 总被引:1,自引:0,他引:1
Zhongwu Wang Shuying Jiao Guodong Han Mengli Zhao Haijun Ding Xinjie Zhang Xiaoliang Wang Eldon L. Ayers Walter D. Willms Kris Havsatad Lata A Yongzhi Liu 《Environmental management》2014,53(2):266-273
Proper grazing management practices can generate corresponding compensatory effects on plant community production, which may reduce inter-annual variability of productivity in some grassland ecosystems. However, it remains unclear how grazing influences plant community attributes and the variability of standing crop. We examined the effects of sheep grazing at four stocking rate treatments [control, 0 sheep ha?1 month?1; light (LG), 0.15 sheep ha?1 month?1; moderate (MG), 0.30 sheep ha?1 month?1; and heavy (HG), 0.45 sheep ha?1 month?1] on standing crop at the community level and partitioned by species and functional groups, in the desert steppe of Inner Mongolia, China. The treatments were arranged in a completely randomized block design over a 9-year period. Standing crop was measured every August from 2004 to 2012. Peak standing crop decreased (P < 0.05) with increasing stocking rate; peak standing crop in the HG treatment decreased 40 % compared to the control. May–July precipitation explained at least 76 % of the variation in peak standing crop. MG and HG treatments resulted in a decrease (P < 0.05) in shrubs, semi-shrubs, and perennials forbs, and an increase (P < 0.05) in perennial bunchgrasses compared to the control. The coefficients of variation at plant functional group and species level in the LG and MG treatments were lower (P < 0.05) than in the control and HG treatments. Peak standing crop variability of the control and HG community were greatest, which suggested that LG and MG have greater ecosystem stability. 相似文献
517.
Amorphous alloys are being newly applied in wastewater treatment because of their unique atomic packing structure. They possess excellent degradation efficiency, stability and reusability. In this work, Fe80Si10B10 and Fe83Si5B8P4 amorphous ribbons exhibited advanced catalytic performance for the degradation of Methyl Blue (MB) and Rhodamine B (RhB) dyes, and the color removal reach nearly 100% within 11 min for both the dyes. Compared with the Fe80Si10B10 amorphous ribbon, the Fe83Si5B8P4 ribbon showed higher degradation efficiency due to its lower reaction activation energy, higher electron transfer ability and higher Fe content, and the formation of the galvanic cell between the strong Fe–P bonds and the weak Fe–B bonds. It also exhibited high stability and reusability. The degradation efficiency was improved when the appropriate concentration of H2O2 is added. As regards the pH, high degradation efficiency was observed in acidic MB solution, but it decreased as the pH increased up to pH 7. The application of the electro–Fenton–like process is discussed, which can effectively improve the degradation performance in a nearly natural solution. This study presents a high efficiency low-cost catalyst for synthetic dye degradation and expands the functional applications of Fe-based amorphous alloys. 相似文献
518.
Occurrence and photochemical degradation of 17alpha-ethinylestradiol in Acushnet River Estuary 总被引:1,自引:0,他引:1
17alpha-Ethinylestradiol (EE2), a major constituent of common contraceptive pills, and three other estrogenic hormones, estrone (E1), 17beta-estradiol (E2) and mestranol (MeEE2) have been determined in Acushnet River Estuary seawater using a GC-MS technique. Among three estrogenic compounds detected, EE2 has the highest concentration, up to 4.7 ng/l, at which EE2 may affect lobster and other fish abundance in the coastal seawater due to its high biological activity on fish feminization. Two natural estrogenic hormones, E1 and E2 have also been found in the estuary at concentrations up to 1.2 ng/l and 0.83 ng/l, respectively. Although EE2 is persistent to microbial degradation, it can undergo a rapid photodegradation in estuarine seawater under natural sunlight irradiation, with a half-life of less than 1.5 days in spring sunny days. 相似文献
519.
Zuo Tian-tian Luo Fei-ya He Huai-zhen Jin Hong-yu Sun Lei Xing Shu-xia Li Bo Gao Fei Ma Shuang-cheng He Lang-chong 《Environmental science and pollution research international》2022,29(18):26513-26523
Environmental Science and Pollution Research - In the present study, the oral bioavailability of cadmium (Cd) in earthworms and leeches was investigated through in vitro physiologically based... 相似文献
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Guo Zhao-Bing Sun Wen-Long Zuo Xiao-Jun Song Hai-Liang Ling Hao Zhang Shuai 《Environmental science and pollution research international》2022,29(24):36216-36224
Environmental Science and Pollution Research - Microbial electrolysis cells (MECs) have been applied for antibiotic degradation but simultaneously induced antibiotic resistance genes (ARGs), thus... 相似文献