摘要
为了消除生态修复过程中除草剂和重金属对沉水植物生长胁迫因素影响,选择草甘膦和Cu2+为目标物,以收割的狐尾藻废弃物为原料,在450℃下炭化2 h制成狐尾藻基生物炭(HW450),研究不同pH和生物炭投加量等实验条件下,HW450对水中草甘膦和Cu2+等单一污染物吸附效果的影响。探究复合污染水体中草甘膦和Cu2+相互影响规律,并用响应面法优化HW450对草甘膦和Cu2+复合污染最优吸附条件。研究结果表明:Cu2+和草甘膦的去除率增速随时间由快到慢,48 h后基本达到平衡;在生物炭吸附饱和范围内,去除率随溶液浓度增加而增加;在适合pH范围内,草甘膦和Cu2+的去除率随pH先增后减,Cu2+比草甘膦变化显著;生物炭投加量增加,能提高草甘膦和Cu2+的去除率。在复合污染中,Cu2+能促进HW450吸附草甘膦;高浓度草甘膦能抑制低浓度Cu2+的吸附,高浓度Cu2+去除率受草甘膦浓度的影响较小。响应面表明,3个因素对去除率的影响排序为:HW450投加量>Cu2+浓度>pH。在pH为5.21,HW450投加量为0.06 g,Cu2+浓度为27.32 mg/L的条件下,能得到复合污染最优吸附效果:草甘膦去除率为97.44%,Cu2+为100%。
To eliminate the influence of herbicides and heavy metals on the growth stress factors of submerged plants in the process of ecological restoration, glyphosate and copper were selected as targets.The harvested Myriophyllum verticillatum L. was carbonized at 450 ℃ for 2 hours to make biochar(HW450).The effect of HW450 on the adsorption effect of glyphosate, copper and other single pollutants in water under pH value, biochar dosage and other experimental conditions was studied.The interaction between glyphosate and copper in composite polluted water was investigated, and the optimal adsorption conditions of HW450 for glyphosate and copper composite pollution were optimized by response surface method.The results showed that the removal rate of copper and glyphosate increased with time from fast to slow and reached a balance after 48 hours.In the adsorption saturation range of biochar, the removal rate increased with the increase of solution concentration.In a suitable pH range, the removal rate of glyphosate and copper increased first and then decreased, and copper changed significantly compared with glyphosate.Increasing the amount of biochar can improve the removal rate of glyphosate and copper.In compound pollution,copper can promote the adsorption of glyphosate by HW450.The high concentration of glyphosate can inhibit the adsorption of low concentration of Cu2+, and the removal rate of high concentration of Cu2+ was less affected by the concentration of glyphosate.The response surface showed that the influence of the three factors on the removal rate was ranked as follows: HW450 dosage > Cu2+ concentration >pH value. Under the conditions of pH = 5.21, HW450 dosage = 0.06 g, Cu2+ concentration = 27.32 mg/L,the optimal adsorption effect of composite pollution can be obtained: the removal rate of glyphosate was 97.44%, and that of Cu2+ was 100%.
作者
周灵
彭自然
周丽丽
戴智
张牧原
刘洪生
ZHOU Ling;PENG Ziran;ZHOU Lili;DAI Zhi;ZHANG Muyuan;LIU Hongsheng(College of Marine Ecology and Environment,Shanghai Ocean University,Shanghai 201306,China)
出处
《上海海洋大学学报》
CAS
CSCD
北大核心
2020年第5期779-788,共10页
Journal of Shanghai Ocean University
基金
国家水体污染控制与治理科技重大专项(2014ZX07101-012-004)。
关键词
狐尾藻
生物炭
草甘膦
CU^2+
响应面
Myriophyllum verticillatum
biochar
glyphosate
copper
response surface
