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| 1 | Adsorption of heavy metal ions from aqueous solution by carboxylated cellulose nanocrystals显示文摘A novel nanoadsorbent for the removal of heavy metal ions is reported.Cotton was first hydrolyzed to obtain cellulose nanocrystals(CNCs).CNCs were then chemically modified with succinic anhydride to obtain SCNCs.The sodic nanoadsorbent(NaSCNCs) was further prepared by treatment of SCNCs with saturated NaHCO 3 aqueous solution.Batch experiments were carried out with SCNCs and NaSCNCs for the removal of Pb 2+ and Cd 2+.The effects of contact time,pH,initial adsorption concentration,coexisting ions and the regeneration performance were investigated.Kinetic studies showed that the adsorption equilibrium time of Pb 2+ and Cd 2+ was reached within 150 min on SCNCs and 5 min on NaSCNCs.The adsorption capacities of Pb 2+ and Cd 2+ on SCNCs and NaSCNCs increased with increasing pH.The adsorption isotherm was well fitted by the Langmuir model.The maximum adsorption capacities of SCNCs and NaSCNCs for Pb 2+ and Cd 2+ were 367.6 mg/g,259.7 mg/g and 465.1 mg/g,344.8 mg/g,respectively.SCNCs and NaSCNCs showed high selectivity and interference resistance from coexisting ions for the adsorption of Pb 2+.NaSCNCs could be efficiently regenerated with a mild saturated NaCl solution with no loss of capacity after two recycles.The adsorption mechanisms of SCNCs and NaSCNCs were discussed. | Xiaolin Yu Shengrui Tong Maofa Ge Lingyan Wu Junchao Zuo Changyan Cao Weiguo Song | 2013 | Journal of Environmental Sciences2013,25,5: | 29 |
| 2 | 黄土颗粒吸附水解尿液中磷酸盐特性及机制显示文摘从源分离尿液中回收磷既能减少城市污水中近50%的磷负荷,又可以促进磷资源的可持续循环。本研究利用物理筛分(d≤100μm)后的天然黄土颗粒作为吸附材料来回收水解尿液中的磷酸盐,重点考察了其对磷酸盐的吸附性能及该过程的作用机制。另外,还建立了吸附动力学和等温线方程,并且讨论了初始p H和接触时间对吸附过程的影响。研究结果表明,黄土颗粒对水解尿液中磷酸盐具有较强的吸附能力,初始p H是影响其对磷酸盐吸附性能的主要因素,最大吸附容量发生在初始p H为10.0时,可达到5.28mg/g。黄土颗粒吸附水解尿液中磷酸盐的主要作用机制是≡M—OH官能团与磷酸根的配位交换反应、羟基磷酸钙沉淀反应及磷酸铵镁沉淀反应,并且水解尿液中高氨氮浓度对黄土颗粒吸附磷酸盐具有促进作用。另外,该吸附过程符合伪二级(R_2~2=0.998)动力学方程且吸附规律符合Freundlich(R_F^2=0.990)等温线方程。 | 蒋善庆 王晓昌 | 2017 | 化工进展2017,36,7: | 9 |
| 3 | Adsorption characteristics of a novel ceramsite for heavy metal removal from stormwater runoff显示文摘Urban sediments have rapidly increased in recent years around the world,and their effective management has become an important problem.To remove heavy metals from stormwater runoff and use sediments as a resource,a novel ceramsite was developed using sewer pipe sediments(SPS),river bed sediments(RBS),urban water supply treatment sludge(WSTS),and wastewater treatment plant excess sludge(WWTS).The optimal composition was determined based on the Brunauer–Emmett–Teller specific surface area and an orthogonal test design.The adsorption characteristics of the novel ceramsite for dissolved heavy metals(Cu^(2+)and Cd^(2+)) were investigated through adsorption isotherms and kinetic experiments at(25±1)℃.Both Cu^(2+) and Cd^(2+) were effectively removed by the novel ceramsite,and their equilibrium adsorption was 4.96 mg·g^(-1) and 3.84 mg·g^(-1),respectively.Langmuir isotherms and a pseudo-first-order kinetic equation described the adsorption process better than other techniques.Characterization analysis of the ceramsite composition before and after heavy metal adsorption showed that the Cu^(2+) and Cd^(2+) contents in the ceramsite increased after adsorption.The results revealed that adsorption is both a physical and chemical process,and that ceramsite can be used as a bioretention medium to remove heavy metals from stormwater runoff while simultaneously converting problematic urban sediments into a resource. | Jianlong wang Yuanling Zhao Pingping Zhang Liqiong Yang Huai'ao Xu Guangpeng Xi | 2018 | Chinese Journal of Chemical Engineering2018,26,1: | 9 |
| 4 | 黄土及其改性黄土在废水处理中的应用研究进展显示文摘属于硅酸盐类无机矿物材料的黄土构成了位于我国中西部的全球规模最大的黄土高原,近年来,有关黄土材料的研究开始受到关注。介绍了黄土的组成结构和基本性质;总结了几种黄土改性的主要方法,如无机改性、有机改性、高分子改性等;叙述了黄土及其改性产物的应用,尤其是在含重金属离子废水、有机废水及含磷废水中的应用研究进展。认为黄土是一种来源广泛、无毒、廉价易得的天然高分子材料,黄土基水处理剂属于绿色水处理材料,将在水处理领域具有更广阔的应用前景;黄土经一定加工处理后,还可用于环境治理、建筑等领域。 | 王莹 何玉凤 王丽 黄一君 王荣民 | 2014 | 水处理技术2014,40,5: | 6 |
| 5 | 纳米SiO_2空心微球对重金属离子的吸附特性显示文摘选用具有高比表面、强吸附能力的二氧化硅纳米空心微球作吸附剂,对Pb2+、Cu2+及Cr3+的吸附性能进行测试。利用Langmuir线性方程对吸附平衡数据进行拟合。结果表明:二氧化硅纳米空心微球对重金属离子具有较高的饱和吸附量,分别为1.256、0.681、0.563 mmol/g。饱和吸附量与重金属离子的共价指数及电荷密度有很强的相关性,随着共价指数增加或电荷密度的降低,饱和吸附量增大;吸附常数与重金属离子电场强度(有效核电荷数)有关,随着有效核电荷数的增加,吸附常数增大。此吸附过程具有化学吸附特征,再生的吸附剂可以重复使用。 | 刘纯 殷恒波 石莉萍 王爱丽 吴占敖 吴刚 姜涛 沈玉堂 姜廷顺 | 2013 | 中国有色金属学报2013,23,6: | 6 |
| 6 | 酸改性泥炭对含亚甲基蓝废水的吸附净化作用显示文摘采用稀硝酸对泥炭进行改性处理获得酸改性泥炭,并将其用于处理亚甲基蓝废水。考察初始溶液pH、接触时间、酸改性泥炭投加量和亚甲基蓝溶液初始浓度等因素对酸改性泥炭吸附效果影响。结果表明,初始溶液pH、接触时间、酸改性泥炭投加量和亚甲基蓝溶液初始浓度对酸改性泥炭吸附性能都有一定的影响。在最佳的反应条件下(接触时间为60 min,反应温度为35℃,初始溶液pH为7.12,酸改性泥炭投加量为2 g),亚甲基蓝去除率可达90.88%,其吸附较好地符合Freundlich和Langmuir等温方程,拟合相关系数均大于0.9。通过热力学计算发现,ΔG<0、ΔS>0,表明该吸附反应是自发的、吸热反应。且该吸附过程符合准二级动力学方程(R2=0.98)。 | 张纯 汪爱河 张伟 汪彩文 | 2014 | 环境工程学报2014,8,9: | 5 |
| 7 | 黄土的疏水改性及对防水涂料的性能影响显示文摘以聚甲基氢硅氧烷(PMHS)为改性剂,采用球磨法对黄土微粒进行表面改性,制备高疏水性能的改性黄土,评价改性黄土对防水涂料性能的影响。结果表明,在球磨的机械作用下,当PMHS用量为6%,球磨时间为30 min时,PMHS改性后的黄土表现出较强的疏水性能,接触角和吸湿率分别为125.1°和0.63%。将PMHS改性黄土和嘉仕涂-100粉料按质量比3∶100混合,制备改性防水涂料,漆膜的拉伸强度、粘结强度和断裂伸长率分别提高了10.4%,48.4%,8.9%,且经过浸水处理后三者的保持率分别在92%,96%和82%以上,改性后的涂料的各项物理力学性能均优于GB/T 23445—2009规定的技术指标(II型)。 | 胡浩斌 韩明虎 张腊腊 张琪 芦娅妮 曹强 武芸 胡乐乐 | 2021 | 应用化工2021,50,8: | 1 |
| 8 | 黄土基吸附剂的制备及吸附性研究进展显示文摘综述了6种不同方式制备的黄土基吸附剂的性能和吸附特点,通过烘干和煅烧的方式,增大了黄土的孔径,并利用黄土的多孔结构在其表面进行修饰,引入与重金属有较强结合力的官能团,提升其对重金属废水的吸附性能。目前,对于黄土改性吸附剂的研究较少,并且大多数的吸附研究主要针对单一重金属离子的模拟废水,未来应着重开发新的改性方法及将其用于实际工业废水处理。 | 陆毕帅 吕向菲 周倩 邵帅 李洁滢 | 2023 | 应用化工2023,52,11: | 0 |
| 9 | MUF-g-PMAA炭化材料的制备及其对Cu(Ⅱ)的吸附显示文摘采用氨基-过硫酸盐氧化-还原引发体系将单体甲基丙烯酸(MAA)接枝聚合在三聚氰胺-尿素-甲醛(MUF)树脂表面,制备接枝材料MUF-g-PMAA,将其低温炭化得到性能稳定的炭化材料,研究了其对Cu2+的吸附性能,考察了温度、p H值的影响.结果表明,在p H=5.0、温度30℃条件下,PMAA-g-MUF对Cu2+的吸附容量达36.1 mg/g;吸附容量随p H值增大而增加,随温度升高呈先增加后减小的趋势,吸附符合Langmuir模型和准二级动力学方程. | 王艳君 胡拖平 高建峰 安富强 欧国利 王宇 周俊丽 | 2015 | 过程工程学报2015,15,5: | 0 |