塑料食品包装材料的环境污染综述
A Review of the Environmental Pollution of Food Plastic Packaging Materials
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摘要: 塑料食品包装材料是食品包装的重要组成部分,但其与食品直接接触时易释放大量化学品和添加剂,且废弃后会分解成粒径小的微塑料,由此造成的环境污染和生态健康风险受到世界各国的广泛关注,并针对食品包装塑料中有害化学品向食品中的释放迁移过程、微塑料及其中化学品的环境污染过程等开展了大量研究。本文综述了常用塑料食品包装材料的种类、用途及其中的化学物质,详细总结了食品包装塑料自身及其中化学品的环境污染过程和生态/健康毒性效应,并据此提出了塑料食品包装材料今后的控制措施及相关研究的发展方向。Abstract: Plastics play an important role in food packaging. However, these polymeric materials always contain a large number of chemicals and additives, which could be released into food during their contact with food, and into the environmental media after use. Besides, these plastics can be decomposed into microplastics after being discarded. The environmental occurrence and behaviors of these plastics and related chemicals have caused increasing concern around the world due to their potential ecological and health risks. In recent years, many studies were carried out on the migration of harmful chemicals from food packaging plastics to food, as well as the environmental pollution process of microplastics and related chemicals. In this paper, the types, uses and chemical additives of commonly used plastic food packaging materials are reviewed, the environmental pollution process and ecological/health effects of plastic food packaging materials and their related chemicals are summarized in detail, and accordingly the control measures and future research directions of food packaging plastics are proposed.
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Key words:
- plastic food packing material /
- microplastics /
- food safety /
- ecological effect /
- health risk
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氟污染是一个全球性问题,特别是在发展中国家[1],其中钢铁冶金、铝电解、铅锌冶炼、铜冶炼、光伏产业、锂离子电池等冶金行业是氟污染的主要来源[2]。过量摄入氟化物将会对人体产生有害影响,阻碍儿童生长发育[3]。我国对地表水体及生活饮用水中的氟化物质量浓度有严格的限值,也不断强化关于氟化物排放的管控。目前,水体中氟化物的去除技术主要有沉淀絮凝法、膜处理法、离子交换法、吸附法[4-7],其中吸附法具有产生无害废物数量少、材料成本低、操作简便等优点,被认为是最有前途的除氟方法。
生物炭具有较大的比表面积,表面含有丰富的含氧官能团,且相对廉价,可作为新型吸附材料用于环境修复领域[8-9]。近年来,已有关于不同生物质来源(改性)生物炭除氟应用的研究报道。汤家喜等[10]利用花生壳、玉米秸秆制备的生物炭,最大吸附容量为1.18 mg·g−1;邱会华等[11]制备的氢氧化钾活化的荷叶基生物炭,最大吸附容量为0.85 mg·g−1;张涛等[12]制备了铁改性猪粪生物炭,最大吸附容量为4.4 mg·g−1;徐凌云等[13]制备了铝负载酒糟生物炭,最大吸附容量为18.05 mg·g−1;FENG等[14]利用城市污水处理厂污泥合成的改性污泥生物炭最大吸附容量高达30.49 mg·g−1。显然,不同原料衍生的生物炭吸附除氟能力不尽相同,其中由于污泥含有更高含量的亲氟矿物,其衍生的污泥生物炭对氟的吸附能力最强。但是,未经改性的污泥生物炭直接除氟效果并不理想,一般需要通过铝、铁等金属的负载以提高其吸附性能。近年来发现镧[15]、铈[16]、钇[17]等稀土金属有更好的亲氟性,可用于氟化物的去除,但是单独使用成本较高,如与铁或铝复合使用,有望发挥协同作用并降低成本。另外,我国污泥产量巨大,据统计2021年我国含水率80%的城市污泥产量已超过6 000×104 t[18]。当前污泥的主流处置方式包括干化焚烧、污泥堆肥和卫生填埋,都可能产生二次污染,对环境造成巨大的风险[19-20]。因此,研发基于污泥生物炭的复合改性除氟材料,拓展污泥资源化利用途径,实现以废治废,具有较好的开发前景。
本研究以南通市政污泥为原料,通过缺氧热解-醋酸钾活化-铝铈改性工艺,制备了铝铈改性污泥生物炭(Al/Ce-CSBC),运用SEM、EDS、BET、XRD及XPS等技术对材料吸附前后的表面形态和结构特征进行了表征和分析,探究了Al/Ce-CSBC对模拟废水中氟离子的吸附行为和吸附机理,以期为污泥生物炭在除氟的资源化利用研究提供参考。
1. 实验部分
1.1 材料与试剂
干化污泥来自南通市某污水处理厂,在90 ℃鼓风干燥箱中干燥12 h后,粉碎过50目筛备用。所用试剂包括六水合氯化铝(AlCl3·6H2O)、七水合氯化铈(CeCl3·7H2O)、氟化钠(NaF)、醋酸钾(CH3COOK)、氢氧化钠(NaOH)等均为分析纯。准确称取2.21 g干燥的氟化钠粉末溶解在1 000 mL去离子水中,配置成氟离子质量浓度为1 g·L−1的储备液,移取适量储备液用去离子水稀释,配成一定初始氟离子质量浓度的含氟模拟废水。
1.2 双金属改性污泥生物炭的制备
污泥的热解制备生物炭。称取5.00 g经干燥的污泥粉末置于坩埚中,用锡纸包裹,放入马弗炉中以10 ℃·min−1的速度升至650 ℃,并保持温度1 h。将热解后的污泥与醋酸钾按质量比1:2的比例混合,再次放入马弗炉中以10 ℃·min−1的速度升至650 ℃热解1 h,离心洗涤3次,并在80~90 ℃下干燥8 h。第1次热解污泥生物炭产物产量为3.21 g,记为SBC;与醋酸钾混合的第2次热解产物产量为4.29 g,记为CSBC。
生物炭的金属改性。将事先称取的1.00 g CSBC加入体积总量为50 mL的氯化铝(0.10 mol·L−1)、氯化铈(0.05 mol·L−1)或两者的等体积混合溶液中,磁力搅拌2 h,用1.00 mol·L−1氢氧化钠溶液调节溶液pH至7.5,搅拌12 h。离心洗涤3次,最后在80~90 ℃下干燥8 h得到改性污泥生物炭材料。对铝、铈以及铝铈联合改性的污泥生物炭分别命名为Al-CSBC、Ce-CSBC以及Al/Ce-CSBC,其中Al/Ce-CSBC的产量为1.29 g。
1.3 样品的表征与分析
利用扫描电子显微镜(SEM)(Gemini SEM 300,德国)分析样品的表面形态;利用能谱仪(EDS)分析样品表面的元素;采用比表面积及孔径分析仪(ASAP2460,美国)分析样品的比表面积和孔容孔径;采用X射线粉末衍射仪(XRD)(Ultima IV,日本)分析样品的物相组成及结构;采用X射线光电子能谱仪(XPS)(K-Alpha+,美国)用于确定生物炭表面的成分和价态。
1.4 吸附实验
准确称取0.04 g吸附剂(Al/Ce-CSBC)置于离心管中,加入40 mL 氟离子质量浓度为10 mg·L−1的模拟废水,立刻移至恒温振荡箱中以140 r·min−1的速度振荡20 h,过0.45 μm滤膜后,用氟离子选择电极(PXSJ-216F)测量滤液中氟离子的质量浓度,每次实验重复3次。pH影响实验只改变pH(3.0~10.0),其余参数不变。吸附等温线实验改变氟离子初始质量浓度(5~100 mg·L−1),采用Langmuir模型和Freundlich模型对实验数据进行拟合。
吸附动力学实验在盛有2 000 mL氟离子初始质量浓度10 mg·L−1溶液的烧杯中进行,调节并保持溶液pH为6.0,将2.00 g吸附剂加入其中后开始磁力搅拌,至规定时间抽取20 mL混合液过滤,测量滤液中氟离子的质量浓度。采用Lagergren伪一阶、伪二阶模型以及Weber-Morris模型对实验数据进行拟合。
2. 结果与讨论
2.1 污泥生物炭的特征
图1为SBC、CSBC、Al/Ce-CSBC及吸附后的复合负载改性材料(F-Al/Ce-CSBC)的SEM图像。SBC表面呈现片状和层状结构,经醋酸钾活化后的CSBC表面呈现堆砌的颗粒状结构,经改性后的Al/Ce-CSBC表面呈块状且附着颗粒状结构,吸附后的F-Al/Ce-CSBC与Al/Ce-CSBC表面形态区别不大。图2为SBC和Al/Ce-CSBC的EDS图谱,SBC的表面元素主要为O、C、Ca及Fe,Al/Ce-CSBC的表面元素主要为C、O、Si和Ce。由表1可见,相对于SBC,Al/Ce-CSBC表面C和Ce的含量有所增加,O和Ca的含量有所降低。前者表明Ce的成功负载以及通过醋酸钾活化引入了大量的碳;后者与金属矿物组分的溶解损失有关,其中Ca的损失最严重,其含量从SBC的16.4%降至改性后的0.2%,几乎完全消失。
表 1 样品元素含量变化Table 1. Changes in the element content of the samples% 样品 O C Ca Fe Al Si P Mg K Ce SBC 39.9 28.0 16.4 4.0 3.7 3.4 1.1 1.0 0.8 0 Al/Ce-CSBC 35.1 46.8 0.2 1.8 1.7 10.9 0 0.2 0.6 2.3 从图3(a)、图3(c)和图3(e)的N2吸附/脱附等温线可以看出,3种样品等温线都属于IV类,且具H3型回滞环特征,表明样品内部存在丰富狭缝形介孔。图3((b)、图3(d)和图3(f))的孔径分布结果表明,经醋酸钾活化和复合负载改性后的CSBC及Al/Ce-CSBC材料孔径分布更呈多样化,但尖锐峰向更小孔径方向移动,其平均孔径应减小,这在表2中得到验证。由表2可见,SBC经活化和改性后,平均孔径变小,但孔容和比表面积有所增大。比表面积由原来的25.59 m2·g−1增至活化后的69.78 m2·g−1及改性后的176.36 m2·g−1,平均孔径则相应由13.4 nm降至11.4 nm和6.6 nm。活化和改性均能显著增加比表面积,可能是由于醋酸钾在活化过程中分解产生大量的CO2,以及改性溶液中酸溶解样品中大量的CaCO3,使得生物炭片层开裂,暴露出更多更小孔径的介孔。
表 2 样品的孔隙结构Table 2. Pore structure of the studied samples样品 BET比表面积/(m2·g−1) 总孔体积/(cm3·g−1) 平均孔径/nm SBC 25.59 0.114 4 13.454 CSBC 69.78 0.144 0 11.395 Al/Ce-CSBC 176.36 0.174 8 6.610 图4(a)为SBC、CSBC、Al/Ce-CSBC和F-Al/Ce-CSBC的XRD图谱。其中SBC中含有明显的SiO2和CaCO3的衍射峰,CSBC中SiO2和CaCO3的峰强明显下降,表明该矿物组分的部分消溶,可能是醋酸钾活化促进了SiO2和CaCO3在高温的消溶/蚀刻反应,进而形成较小的孔隙和较大的比表面积。改性后的Al/Ce-CSBC中CaCO3的衍射峰则完全消失,可能是改性过程引入的金属盐水解产生强酸,使得残留的CaCO3被进一步完全溶解,形成更小的孔隙和更大的比表面积,这与前述关于Ca元素及孔隙的变化相一致。相对于SBC,CSBC和Al/Ce-CSBC中的SiO2的峰强均有不同程度的降低,表明活化和改性对SiO2也有一定的消溶作用。由Al/Ce-CSBC的XRD图谱可知,改性污泥生物炭有SiO2及少量的Al2SiO5晶体,前者是污泥自有残留,后者应为溶出的硅与改性引入的铝反应的产物,此外并没有出现铝和铈的其他晶体结构,表明改性金属主要以无定形负载于污泥生物炭的表面。除了二氧化硅晶体峰强度有略微降低,吸附氟后材料(F-Al/Ce-CSBC)的XRD图谱与吸附前基本一致,表明材料中的晶体结构稳定,推测其不参与对氟的吸附过程,无定形双金属羟基/氧化物应是主要吸附活性组分。由XPS图谱(图4(b))可知,SBC在346.89 eV处有较强的Ca2p信号,在CSBC相对减少,在Al/Ce-CSBC及F-Al/Ce-CSBC则完全消失,趋势与XRD一致,再次验证了碳酸钙的逐步溶解至完全消失的过程。Al/Ce-CSBC的XPS图谱中74.97 eV和885.72 eV处的峰分别对应Al2p和Ce3d,表明铝和铈的成功负载,这与EDS和XRD的结果一致。
图5较直观地显示了上述活化和改性过程的物性变化,即活化过程促进污泥生物炭中二氧化硅和碳酸钙晶体部分消溶,同时醋酸钾发生气化反应,产生造孔作用[21],使得CSBC的比表面积增大(表2);改性过程铝铈被成功负载,碳酸钙完全消失,形成更多的细小孔径,造孔作用更明显,比表面积增加更显著,而少量二氧化硅溶解后与铝(Ⅲ)形成硅酸铝晶体。
不同合成阶段和金属改性的材料对F−的吸附容量如图6所示,原始污泥生物炭SBC的吸附容量为5.42 mg·g−1,经醋酸钾活化后得CSBC的吸附容量则下降至2.90 mg·g−1,可能是SBC经活化后,部分有利于除氟的矿物(主要是含Ca矿物)溶解流失所致。CSBC再经金属改性后的吸附容量均有提升,但不同金属/金属组合改性提升程度不同,单一的Ce和Al改性使材料吸附容量分别提升了44%和157%,而Al-Ce联合改性则提升了228%,高于2种单一金属改性材料提升量之和,这表明铝铈双金属改性发挥了协同作用。
2.2 pH对吸附的影响
pH对Al/Ce-CSBC材料的吸附影响如图7所示,在氟离子初始质量浓度为10 mg·L−1,在酸性范围内,吸附容量随着pH的增加逐渐升高,在pH=6.0时达到最高值9.43 mg·g−1,随后随着pH的增加而逐渐降低,pH升至9.0以上,则急剧下降,其除氟率也有类似规律。Al/Ce-CSBC在溶液pH=4.0~9.0内均有75%以上的除氟率,这是由于生物炭的分散作用,将更多的活性位点充分暴露,使得其有更宽的pH适用范围[22]。同时考察了该体系吸附前后的pH变化,其结果见图8(a)。当pH<6.0时,吸附平衡后的pH有所升高,反之则有所降低,表明Al/Ce-CSBC吸附材料具有一定的pH缓冲作用,FENG等[14]研究其他氧化铝材料也有类似结果,认为该缓冲作用由铝盐的两性性质引起,具体表现为固态金属氧化物表面水解羟基化和质子化作用,详见后文机理分析部分。图8(b)为不同pH下Al/Ce-CSBC的Zeta电位变化。由图可见,该材料的零电位点(pHPZC)高达9.5,表明吸附剂在一定的碱性范围仍带正电荷,可能是因为Al/Ce-CSBC的比表面积较大,具有较好分散性,使得其表面正电荷得到较好维持和保护[22]。在pH<7.0时溶液中含有大量的H+,使得吸附剂表面发生质子化,体系Zeta电位为正值,能够与溶液中的F−发生静电吸附,但过低的pH可能造成吸附剂表面负载的金属氧化物溶解,并有HF的生成,使吸附剂的吸附容量下降。在pH>7.0时,溶液中的OH−会与F−竞争吸附位点,使吸附容量有所下降。在pH=10.0时,吸附容量和除氟率下降更明显,其原因除了前述的竞争吸附,还由于吸附剂表面此时逆转为荷负电,对溶液中的F−产生强烈的静电排斥作用。
2.3 吸附动力学
在氟离子初始质量浓度为10 mg·L−1时,Al/Ce-CSBC的吸附容量随吸附时间的变化情况如图9所示。在前期吸附速率较快,10 min内吸附容量达到了8.30 mg·g−1;随后缓慢增加,在5 h时接近平衡状态。
对吸附动力学数据的拟合结果表明,伪二级模型(R2=0.94)比伪一级模型(R2=0.49)更适合描述Al/Ce-CSBC对氟离子的吸附,表明氟化物在Al/Ce-CSBC上的吸附以化学吸附为主。颗粒内扩散模型如图9(b)所示。吸附反应可分为2个阶段,第1阶段,F−通过界面膜扩散从液相水体转移到Al/Ce-CSBC的表面,并与表面大量的吸附位点结合产生快速吸附,这一阶段膜扩散是控制吸附速率的限制步骤;第2阶段,由于大量的F−占据了吸附剂表面的吸附位点,部分F−将渗透到吸附剂内部的孔径中,因此又被称为孔扩散阶段,第2阶段速率有所降低,该图没有通过原点表明颗粒内扩散不是唯一限速步骤[23]。
2.4 吸附等温线分析
在常温且pH=6.0的条件下,Al/Ce-CSBC的吸附容量随氟离子初始质量浓度变化情况如图10所示。2种模型均能较好描述吸附过程,但Freundlich模型(R2=0.97)较Langmuir模型(R2=0.92)拟合程度更好,表明氟化物在Al/Ce-CSBC上的吸附以多层吸附为主,且Al/Ce-CSBC表面上的活性位点不均匀,1/n =0.29 (0<1/n<1)也表明吸附等温线类型是理想类型[24]。Langmuir模型中最大吸附容量41.47 mg·g−1,其与实际最大吸附容量45.66 mg·g−1相近。
2.5 吸附机理
图11(a)为Al/Ce-CSBC材料的XPS全谱图,通过吸附前后的比较发现,吸附后的F-Al/Ce-CSBC在684.15 eV处新增了F1s的峰,表明氟离子被成功吸附在Al/Ce-CSBC吸附剂表面。为了研究其吸附机理,进一步分析了Al/Ce-CSBC吸附氟前后的XPS精细光谱(图11(b)~(d))。由图11(b)的O1s图谱中可见,吸附前531.28 eV和532.54 eV处的特征峰分别对应M―O和―OH,吸附后分别移至530.01 eV和531.39 eV,其中羟基氧占总氧的相对比率由吸附前的55.24%降至41.52%,金属氧化物中M―O的含量由吸附前的44.76%升至58.48%,表明―OH参与了与氟离子的交换。这与其他研究[25-26]结果一致。由图11(c)的Al2p图谱可见,74.46和75.17 eV处峰分别对应Al―O和Al―OH,均归属于负载于材料表面的无定形铝氧化物结构,吸附后峰位置分别移至73.10 eV和73.69 eV。这表明铝羟基/氧化物参与了氟离子的吸附[27-28]。吸附前后Ce元素XPS结果如图11(d)所示。Al/Ce-CSBC的Ce3d5/2的4个代表性峰位于882.78、886.30、888.64及899.35 eV,Ce3d3/2的3个代表性峰位于902.32、905.56及917.10 eV,以上7个峰吸附后分别移至881.34、884.50、886.98、898.37、901.83、904.88及915.65 eV,可清楚地观察到向低能方向位移。经计算Ce4+丰度由吸附前的36.51%下降到22.28%,说明F―Ce络合物的形成及电子转移[16, 29]。
基于上述对氟化物吸附过程pH的变化、等温线模型、动力学模型以及XPS表征分析结果,认为Al/Ce-CSBC对氟化物的吸附为物理吸附和化学吸附,其中化学吸附包括离子交换和表面络合占主导作用。改性过程中形成大量带正电荷的金属羟基/氧化物,且以无定形形式非均匀分散于污泥生物炭的表面,产生大量有效吸附位点并处于相对受保护的高分散体系中,使其表现出较高的零电荷点[22]和酸碱缓冲特性[14]。在碱性条件下产生大量的表面羟基和O2−,并带负电荷(式(1)~式(2));酸性条件下则质子化并带正电荷(式(3))。
≡M++OH−→≡M−OH (1) ≡M−OH+OH−→≡M−O−2+H2O (2) ≡M−OH+H+→≡M−OH+2 (3) 在酸性条件下吸附剂表面的Zeta电位较高,对溶液中氟离子产生较强静电吸引,进一步引起式(4)反应,产物以金属氟化络合物形式结合在吸附剂表面,表现很高的吸附量和吸附能力,但是酸性过低时,氟主要以氟化氢形式存在,兼吸附剂表面金属的溶出,使得吸附容量下降;随着溶液pH的增加,吸附剂表面的Zeta电位降低,静电吸引减弱,超过零电点后吸附剂表面荷负电产生静电排斥,此时吸附以离子交换为主(式(5))。
≡MOH+2+F−→≡M−F+H2O (4) ≡M−OH+F−→≡M−F+OH− (5) 2.6 与其他除氟吸附剂的比较
通过与其他文献报道的吸附剂除氟性能的比较(表3),本研究使用的Al/Ce-CSBC有明显的相对优势。Al/Ce-CSBC最大吸附容量为41.47 mg·g−1,高于其他材料的吸附量,包括传统活性氧化铝(16.30 mg·g−1)、双金属和三金属复合材料(27~32 mg·g−1)、其他改性生物炭材料(18~28 mg·g−1)以及铝铁改性污泥生物炭材料(30 mg·g−1)。就酸碱适用性而言,Al/Ce-CSBC在较广的范围(pH=4.0~9.0)内均有75%以上的去除率,其他材料(除了三元金属复合材料)则类似传统的活性氧化铝,只能在较窄的酸性范围才有较高的除氟率。因此,铝铈改性污泥生物炭在较广的酸碱范围有较好的强化除氟作用,并可实现污泥的低碳固定和以废治废,在实际废水处理中有潜在应用价值。
表 3 不同吸附剂的氟离子吸附性能对比Table 3. Comparison of fluorine ion adsorption performance of different adsorbents3. 结论
1)以市政污泥为原料,通过热解-活化-双金属改性成功制备了铝铈负载污泥生物炭Al/Ce-CSBC,活化和改性均可通过造孔和促消溶作用增加材料比表面积和分散性,使负载的无定形金属羟基/氧化物保持吸附活性,材料具较高的等电点和酸碱缓冲性;
2) Al/Ce-CSBC对氟的最大吸附容量达到41.74 mg·g−1,在pH=4.0~9.0内均有较高的除氟率。其吸附动力学符合伪二级模型,吸附等温线符合Freundlich模型,为多层不均质吸附和化学吸附,其吸附机制包括静电吸附、表面络合和离子交换。
3) Al/Ce-CSBC可发挥铝铈双金属协同吸附作用,且在较广的酸碱范围有较好的强化除氟作用。该吸附材料制备简单、廉价,有望实现以废治废和污泥的低碳固定,有潜在的应用价值。
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中华人民共和国中共中央网络安全和信息化委员会办公室, 中华人民共和国国家互联网信息办公室, 中国互联网络信息中心. 第47次中国互联网络发展状况统计报告[R]. 北京:中华人民共和国中共中央网络安全和信息化委员会办公室, 中华人民共和国国家互联网信息办公室, 中国互联网络信息中心, 2021 新华网. 外卖体系需要告别"辛苦钱". (2021-01-01). http://www.xinhuanet.com/food/2021-01/12/c_1126971924.htm. -

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